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Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions	3 Months Ended
	Mar. 31, 2010	Mar. 31, 2009
Operating revenues
Total operating revenues	$ 4,461,000,000	$ 4,722,000,000
Operating expenses
Purchased power	658,000,000	683,000,000
Fuel	601,000,000	776,000,000
Operating and maintenance	1,062,000,000	1,361,000,000
Operating and maintenance for regulatory required programs	27,000,000	11,000,000
Depreciation and amortization	514,000,000	436,000,000
Taxes other than income	197,000,000	200,000,000
Total operating expenses	3,059,000,000	3,467,000,000
Operating income	1,402,000,000	1,255,000,000
Other income and deductions
Interest expense	(177,000,000)	(163,000,000)
Interest expense to affiliates, net	(6,000,000)	(24,000,000)
Loss in equity method investments	0	(8,000,000)
Other, net	93,000,000	(37,000,000)
Total other income and deductions	(90,000,000)	(232,000,000)
Income before income taxes	1,312,000,000	1,023,000,000
Income taxes	563,000,000	311,000,000
Discontinued operations
Net income	749,000,000	712,000,000
Pension and non-pension postretirement benefit plans:
Prior service benefit reclassified to periodic benefit cost	(3,000,000)	(3,000,000)
Actuarial loss reclassified to periodic cost	31,000,000	22,000,000
Transition obligation reclassified to periodic cost	1,000,000	1,000,000
Pension and non-pension postretirement benefit plans valuation adjustment	(18,000,000)	28,000,000
Change in unrealized gain on cash-flow hedges	383,000,000	525,000,000
Change in unrealized loss on marketable securities	0	(2,000,000)
Other comprehensive income (loss)	394,000,000	571,000,000
Comprehensive income	$ 1,143,000,000	$ 1,283,000,000
Average shares of common stock outstanding:
Basic	661	659
Diluted	662	661
Earnings per average common share - basic:
Net income	$ 1.13	$ 1.08
Earnings per average common share - diluted:
Net income	1.13	1.08
Dividends per common share	0.53	0.53
EXELON GENERATION CO LLC
Operating revenues
Operating revenues	1,594,000,000	1,657,000,000
Operating revenues from affiliates	827,000,000	944,000,000
Total operating revenues	2,421,000,000	2,601,000,000
Operating expenses
Purchased power	208,000,000	175,000,000
Fuel	391,000,000	510,000,000
Operating and maintenance	664,000,000	849,000,000
Operating and maintenance from affiliate	76,000,000	79,000,000
Depreciation and amortization	109,000,000	76,000,000
Taxes other than income	57,000,000	50,000,000
Total operating expenses	1,505,000,000	1,739,000,000
Operating income	916,000,000	862,000,000
Other income and deductions
Interest expense	(35,000,000)	(29,000,000)
Loss in equity method investments	0	(1,000,000)
Other, net	79,000,000	(82,000,000)
Total other income and deductions	44,000,000	(112,000,000)
Income before income taxes	960,000,000	750,000,000
Income taxes	399,000,000	222,000,000
Discontinued operations
Net income	561,000,000	528,000,000
Pension and non-pension postretirement benefit plans:
Change in unrealized gain on cash-flow hedges	551,000,000	959,000,000
Other comprehensive income (loss)	551,000,000	959,000,000
Comprehensive income	1,112,000,000	1,487,000,000
COMMONWEALTH EDISON CO
Operating revenues
Operating revenues	1,414,000,000	1,552,000,000
Operating revenues from affiliates	1,000,000	1,000,000
Total operating revenues	1,415,000,000	1,553,000,000
Operating expenses
Purchased power	384,000,000	443,000,000
Purchased power from affiliate	369,000,000	439,000,000
Operating and maintenance	120,000,000	210,000,000
Operating and maintenance from affiliate	39,000,000	43,000,000
Operating and maintenance for regulatory required programs	19,000,000	11,000,000
Depreciation and amortization	130,000,000	123,000,000
Taxes other than income	63,000,000	78,000,000
Total operating expenses	1,124,000,000	1,347,000,000
Operating income	291,000,000	206,000,000
Other income and deductions
Interest expense	(81,000,000)	(80,000,000)
Interest expense to affiliates, net	(3,000,000)	(3,000,000)
Other, net	3,000,000	32,000,000
Total other income and deductions	(81,000,000)	(51,000,000)
Income before income taxes	210,000,000	155,000,000
Income taxes	94,000,000	41,000,000
Discontinued operations
Net income	116,000,000	114,000,000
Pension and non-pension postretirement benefit plans:
Change in unrealized loss on marketable securities	0	(2,000,000)
Other comprehensive income (loss)	0	(2,000,000)
Comprehensive income	116,000,000	112,000,000
PECO ENERGY CO
Operating revenues
Operating revenues	1,454,000,000	1,511,000,000
Operating revenues from affiliates	1,000,000	3,000,000
Total operating revenues	1,455,000,000	1,514,000,000
Operating expenses
Purchased power	66,000,000	66,000,000
Purchased power from affiliate	458,000,000	504,000,000
Fuel	211,000,000	266,000,000
Operating and maintenance	158,000,000	153,000,000
Operating and maintenance from affiliate	23,000,000	24,000,000
Operating and maintenance for regulatory required programs	8,000,000	0
Depreciation and amortization	265,000,000	225,000,000
Taxes other than income	72,000,000	66,000,000
Total operating expenses	1,261,000,000	1,304,000,000
Operating income	194,000,000	210,000,000
Other income and deductions
Interest expense	(42,000,000)	(29,000,000)
Interest expense to affiliates, net	(3,000,000)	(21,000,000)
Loss in equity method investments	0	(7,000,000)
Other, net	4,000,000	5,000,000
Total other income and deductions	(41,000,000)	(52,000,000)
Income before income taxes	153,000,000	158,000,000
Income taxes	52,000,000	45,000,000
Discontinued operations
Net income	101,000,000	113,000,000
Preferred security dividends	1,000,000	1,000,000
Net income on common stock	100,000,000	112,000,000
Pension and non-pension postretirement benefit plans:
Amortization of realized loss on settled cash flow swaps	0	(1,000,000)
Other comprehensive income (loss)	0	(1,000,000)
Comprehensive income	$ 101,000,000	$ 112,000,000

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2010	Mar. 31, 2009
Cash flows from operating activities
Net income	$ 749	$ 712
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	718	622
Impairment of long-lived assets	0	223
Deferred income taxes and amortization of investment tax credits	(4)	(80)
Net fair value change related to derivatives	(233)	(164)
Net realized and unrealized (gains) losses on nuclear decommissioning trust fund investments	(36)	68
Other non-cash operating activities	72	280
Changes in assets and liabilities:
Accounts receivable	40	108
Inventories	67	132
Accounts payable, accrued expenses and other current liabilities	(303)	(542)
Option premiums (paid) received, net	66	(68)
Counterparty collateral received, net	477	784
Income taxes	517	161
Pension and non-pension postretirement benefit contributions	(98)	(37)
Other assets and liabilities	(171)	(249)
Net cash flows provided by operating activities	1,861	1,950
Cash flows from investing activities
Capital expenditures	(878)	(712)
Proceeds from nuclear decommissioning trust fund sales	5,968	3,050
Investment in nuclear decommissioning trust funds	(6,025)	(3,109)
Change in restricted cash	214	23
Other investing activities	12	(4)
Net cash flows provided by (used in) investing activities	(709)	(752)
Cash flows from financing activities
Changes in short-term debt	101	(4)
Issuance of long-term debt	0	249
Retirement of long-term debt	(1)	(64)
Retirement of long-term debt of variable interest entity	(402)	0
Retirement of long-term debt to financing affiliates	0	(169)
Dividends paid on common stock	(347)	(346)
Proceeds from employee stock plans	11	9
Other financing activities	0	5
Net cash flows provided by (used in) financing activities	(638)	(320)
Increase (decrease) in cash and cash equivalents	514	878
Cash and cash equivalents at beginning of period	2,010	1,271
Cash and cash equivalents at end of period	2,524	2,149
EXELON GENERATION CO LLC
Cash flows from operating activities
Net income	561	528
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	313	262
Impairment of long-lived assets	0	223
Deferred income taxes and amortization of investment tax credits	67	(66)
Net fair value change related to derivatives	(233)	(164)
Net realized and unrealized (gains) losses on nuclear decommissioning trust fund investments	(36)	68
Other non-cash operating activities	16	113
Changes in assets and liabilities:
Accounts receivable	79	92
Receivables from and payables to affiliates, net	39	(24)
Inventories	15	28
Accounts payable, accrued expenses and other current liabilities	(74)	(223)
Option premiums (paid) received, net	66	(68)
Counterparty collateral received, net	478	784
Income taxes	358	149
Pension and non-pension postretirement benefit contributions	(53)	(16)
Other assets and liabilities	(31)	(34)
Net cash flows provided by operating activities	1,565	1,652
Cash flows from investing activities
Capital expenditures	(592)	(376)
Proceeds from nuclear decommissioning trust fund sales	5,968	3,050
Investment in nuclear decommissioning trust funds	(6,025)	(3,109)
Changes in Exelon intercompany money pool	0	(96)
Change in restricted cash	1	8
Other investing activities	(1)	(5)
Net cash flows provided by (used in) investing activities	(649)	(528)
Cash flows from financing activities
Retirement of long-term debt	(1)	(47)
Distribution to member	(261)	(279)
Other financing activities	0	2
Net cash flows provided by (used in) financing activities	(262)	(324)
Increase (decrease) in cash and cash equivalents	654	800
Cash and cash equivalents at beginning of period	1,099	1,135
Cash and cash equivalents at end of period	1,753	1,935
COMMONWEALTH EDISON CO
Cash flows from operating activities
Net income	116	114
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	130	123
Deferred income taxes and amortization of investment tax credits	7	57
Other non-cash operating activities	(2)	72
Changes in assets and liabilities:
Accounts receivable	(5)	11
Receivables from and payables to affiliates, net	(11)	(35)
Inventories	(1)	(6)
Accounts payable, accrued expenses and other current liabilities	(166)	(163)
Income taxes	85	(11)
Pension and non-pension postretirement benefit contributions	(14)	(2)
Other assets and liabilities	18	23
Net cash flows provided by operating activities	157	183
Cash flows from investing activities
Capital expenditures	(244)	(225)
Change in restricted cash	0	(1)
Other investing activities	10	1
Net cash flows provided by (used in) investing activities	(234)	(225)
Cash flows from financing activities
Changes in short-term debt	101	115
Retirement of long-term debt	0	(17)
Dividends paid on common stock	(75)	(60)
Net cash flows provided by (used in) financing activities	26	38
Increase (decrease) in cash and cash equivalents	(51)	(4)
Cash and cash equivalents at beginning of period	91	47
Cash and cash equivalents at end of period	40	43
PECO ENERGY CO
Cash flows from operating activities
Net income	101	113
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	265	225
Deferred income taxes and amortization of investment tax credits	(105)	(76)
Other non-cash operating activities	33	57
Changes in assets and liabilities:
Accounts receivable	(42)	4
Receivables from and payables to affiliates, net	(21)	40
Inventories	54	110
Accounts payable, accrued expenses and other current liabilities	(7)	(129)
Income taxes	109	65
Pension and non-pension postretirement benefit contributions	(15)	(10)
Other assets and liabilities	(153)	(188)
Net cash flows provided by operating activities	219	211
Cash flows from investing activities
Capital expenditures	(113)	(91)
Change in restricted cash	216	2
Other investing activities	2	0
Net cash flows provided by (used in) investing activities	105	(89)
Cash flows from financing activities
Changes in short-term debt	0	(95)
Issuance of long-term debt	0	249
Retirement of long-term debt of variable interest entity	(402)	0
Retirement of long-term debt to financing affiliates	0	(169)
Dividends paid on common stock	(64)	(87)
Dividends paid on preferred securities	(1)	(1)
Repayment of receivable from parent	45	80
Net cash flows provided by (used in) financing activities	(422)	(23)
Increase (decrease) in cash and cash equivalents	(98)	99
Cash and cash equivalents at beginning of period	303	39
Cash and cash equivalents at end of period	$ 205	$ 138

Consolidated Balance Sheets - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2010	Dec. 31, 2009
Current assets
Cash and cash equivalents	$ 2,524	$ 2,010
Restricted cash and investments	42	40
Restricted cash and cash equivalents of variable interest entity	197	0
Accounts receivable, net
Customer	1,628	1,563
Other	439	486
Mark-to-market derivative assets	463	376
Inventories, net
Fossil fuel	130	198
Materials and supplies	562	559
Other	399	209
Total current assets	6,384	5,441
Property, plant and equipment, net	27,737	27,341
Deferred debits and other assets
Regulatory assets	4,668	4,872
Nuclear decommissioning trust funds	6,885	6,669
Investments	709	704
Investments in affiliates	15	20
Goodwill	2,625	2,625
Mark-to-market derivative assets	867	649
Other	851	859
Total deferred debits and other assets	16,620	16,398
Total assets	50,741	49,180
Current liabilities
Short-term borrowings	256	155
Short-term notes payable - accounts receivable agreement	225	0
Long-term debt due within one year	827	639
Long-term debt of variable interest entity due within one year	404	0
Long-term debt to PECO Energy Transition Trust due within one year	0	415
Accounts payable	1,143	1,345
Accrued expenses	1,191	923
Deferred income taxes	220	152
Mark-to-market derivative liabilities	183	198
Other	441	411
Total current liabilities	4,890	4,238
Long-term debt	10,808	10,995
Long-term debt to financing trust	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	5,983	5,750
Asset retirement obligations	3,481	3,434
Pension obligations	3,536	3,625
Non-pension postretirement benefit obligations	2,220	2,180
Spent nuclear fuel obligation	1,017	1,017
Regulatory liabilities	3,572	3,492
Mark-to-market derivative liabilities	8	23
Other	1,298	1,309
Total deferred credits and other liabilities	21,115	20,830
Total liabilities	$ 37,203	$ 36,453
Commitments and contingencies
Preferred securities	$ 87	$ 87
Shareholders' equity
Common stock	8,940	8,923
Treasury stock, at cost (35 and 35 shares held at March 31, 2010 and December 31, 2009, respectively)	(2,328)	(2,328)
Retained earnings	8,534	8,134
Accumulated other comprehensive income (loss), net	(1,695)	(2,089)
Total shareholders' equity	13,451	12,640
Total liabilities and shareholders' equity	50,741	49,180
EXELON GENERATION CO LLC
Current assets
Cash and cash equivalents	1,753	1,099
Restricted cash and cash equivalents	4	5
Accounts receivable, net
Customer	377	495
Other	151	112
Mark-to-market derivative assets	463	376
Mark-to-market derivative assets with affiliate	430	302
Receivables from affiliates	259	297
Inventories, net
Fossil fuel	88	102
Materials and supplies	471	470
Other	129	102
Total current assets	4,125	3,360
Property, plant and equipment, net	10,086	9,809
Deferred debits and other assets
Nuclear decommissioning trust funds	6,885	6,669
Investments	46	46
Mark-to-market derivative assets	855	639
Mark-to-market derivative assets with affiliate	811	671
Prepaid pension asset	1,043	1,027
Other	186	185
Total deferred debits and other assets	9,826	9,237
Total assets	24,037	22,406
Current liabilities
Long-term debt due within one year	214	26
Accounts payable	741	826
Accrued expenses	1,000	670
Payables to affiliates	45	80
Deferred income taxes	534	399
Mark-to-market derivative liabilities	182	198
Other	58	63
Total current liabilities	2,774	2,262
Long-term debt	2,778	2,967
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	3,001	2,707
Asset retirement obligations	3,361	3,316
Non-pension postretirement benefit obligations	689	659
Spent nuclear fuel obligation	1,017	1,017
Payables to affiliates	2,315	2,228
Mark-to-market derivative liabilities	4	21
Other	453	437
Total deferred credits and other liabilities	10,840	10,385
Total liabilities	$ 16,392	$ 15,614
Commitments and contingencies
Member's equity
Membership interest	$ 3,466	$ 3,464
Undistributed earnings	2,469	2,169
Accumulated other comprehensive income, net	1,708	1,157
Total member's equity	7,643	6,790
Noncontrolling interest	2	2
Total equity	7,645	6,792
Total liabilities and equity	24,037	22,406
COMMONWEALTH EDISON CO
Current assets
Cash and cash equivalents	40	91
Restricted cash and cash equivalents	2	2
Accounts receivable, net
Customer	637	676
Other	250	318
Inventories, net
Inventories, net	72	71
Regulatory assets	477	358
Deferred income taxes	49	39
Other	14	24
Total current assets	1,541	1,579
Property, plant and equipment, net	12,211	12,125
Deferred debits and other assets
Regulatory assets	1,305	1,096
Investments	25	28
Investments in affiliates	6	6
Goodwill	2,625	2,625
Receivable from affiliate	1,993	1,920
Prepaid pension asset	890	907
Other	417	411
Total deferred debits and other assets	7,261	6,993
Total assets	21,013	20,697
Current liabilities
Short-term borrowings	256	155
Long-term debt due within one year	213	213
Accounts payable	191	274
Accrued expenses	180	282
Payables to affiliates	140	177
Customer deposits	133	131
Mark-to-market derivative liabilities with affiliate	429	302
Other	72	63
Total current liabilities	1,614	1,597
Long-term debt	4,499	4,498
Long-term debt to financing trust	206	206
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,665	2,648
Asset retirement obligations	95	95
Non-pension postretirement benefit obligations	263	241
Regulatory liabilities	3,229	3,145
Mark-to-market derivative liabilities with affiliate	806	669
Other	713	716
Total deferred credits and other liabilities	7,771	7,514
Total liabilities	$ 14,090	$ 13,815
Commitments and contingencies
Shareholders' equity
Common stock	$ 1,588	$ 1,588
Other paid-in capital	4,990	4,990
Retained earnings	345	304
Total shareholders' equity	6,923	6,882
Total liabilities and shareholders' equity	21,013	20,697
PECO ENERGY CO
Current assets
Cash and cash equivalents	205	303
Restricted cash and cash equivalents	1	1
Restricted cash and cash equivalents of variable interest entity	197	0
Accounts receivable, net
Customer	614	392
Other	68	120
Inventories, net
Fossil fuel	41	96
Materials and supplies	19	18
Deferred income taxes	66	65
Prepaid utility taxes	176	0
Other	14	11
Total current assets	1,401	1,006
Property, plant and equipment, net	5,354	5,297
Deferred debits and other assets
Regulatory assets	1,622	1,834
Investments	19	18
Investments in affiliates	9	13
Receivable from affiliate	325	311
Prepaid pension asset	237	225
Other	314	315
Total deferred debits and other assets	2,526	2,716
Total assets	9,281	9,019
Current liabilities
Short-term notes payable - accounts receivable agreement	225	0
Long-term debt of variable interest entity due within one year	404	0
Long-term debt to PECO Energy Transition Trust due within one year	0	415
Accounts payable	141	164
Accrued expenses	130	74
Payables to affiliates	168	189
Customer deposits	66	65
Mark-to-market derivative liabilities	1	0
Mark-to-market derivative liabilities with affiliate	1	0
Other	52	32
Total current liabilities	1,188	939
Long-term debt	2,221	2,221
Long-term debt to financing trust	184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,140	2,241
Asset retirement obligations	24	24
Non-pension postretirement benefit obligations	304	296
Regulatory liabilities	343	317
Mark-to-market derivative liabilities	4	2
Mark-to-market derivative liabilities with affiliate	5	2
Other	135	141
Total deferred credits and other liabilities	2,955	3,023
Total liabilities	$ 6,548	$ 6,367
Commitments and contingencies
Preferred securities	$ 87	$ 87
Shareholders' equity
Common stock	2,318	2,318
Receivable from parent	(135)	(180)
Retained earnings	462	426
Accumulated other comprehensive income (loss), net	1	1
Total shareholders' equity	2,646	2,565
Total liabilities and shareholders' equity	$ 9,281	$ 9,019

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2010	Dec. 31, 2009
Statement [Line Items]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	2,000	2,000
Common stock, shares outstanding	661	660
Treasury stock, shares held	35	35
Gross accounts receivable pledged as collateral	$ 402
PECO ENERGY CO
Statement [Line Items]
Gross accounts receivable pledged as collateral	$ 402

Consolidated Statement of Changes in Equity shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2010 USD ($) shares
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	$ 12,640
Net income	749
Long-term incentive plan activity	17
Common stock dividends	(349)
Other comprehensive income, net of income taxes	394
Ending Balance	$ 13,451
Common Stock
Accumulated Other Comprehensive Income (Loss)
Beginning Balance \| shares	694,565
Long-term incentive plan activity \| shares	778
Ending Balance \| shares	695,343
Beginning Balance	$ 8,923
Long-term incentive plan activity	17
Ending Balance	8,940
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	(2,328)
Ending Balance	(2,328)
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	8,134
Net income	749
Common stock dividends	(349)
Ending Balance	8,534
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	(2,089)
Other comprehensive income, net of income taxes	394
Ending Balance	(1,695)
EXELON GENERATION CO LLC
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	6,792
Net income	561
Allocation of tax benefit from member	2
Distribution to member	(261)
Other comprehensive income, net of income taxes	551
Ending Balance	7,645
EXELON GENERATION CO LLC \| Membership Interest
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	3,464
Allocation of tax benefit from member	2
Ending Balance	3,466
EXELON GENERATION CO LLC \| Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	2,169
Net income	561
Distribution to member	(261)
Ending Balance	2,469
EXELON GENERATION CO LLC \| Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	1,157
Other comprehensive income, net of income taxes	551
Ending Balance	1,708
EXELON GENERATION CO LLC \| Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	2
Ending Balance	2
COMMONWEALTH EDISON CO
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	6,882
Net income	116
Appropriation of retained earnings for future dividends	0
Common stock dividends	(75)
Other comprehensive income, net of income taxes	0
Ending Balance	6,923
COMMONWEALTH EDISON CO \| Common Stock
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	1,588
Ending Balance	1,588
COMMONWEALTH EDISON CO \| Other Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	4,990
Ending Balance	4,990
COMMONWEALTH EDISON CO \| Retained Deficit Unappropriated
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	(1,639)
Net income	116
Appropriation of retained earnings for future dividends	(116)
Ending Balance	(1,639)
COMMONWEALTH EDISON CO \| Retained Earnings Appropriated
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	1,943
Appropriation of retained earnings for future dividends	116
Common stock dividends	(75)
Ending Balance	1,984
PECO ENERGY CO
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	2,565
Net income	101
Common stock dividends	(64)
Preferred security dividends	(1)
Repayment of receivable from parent	45
Other comprehensive income, net of income taxes	0
Ending Balance	2,646
PECO ENERGY CO \| Common Stock
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	2,318
Ending Balance	2,318
PECO ENERGY CO \| Receivable from Parent
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	(180)
Repayment of receivable from parent	45
Ending Balance	(135)
PECO ENERGY CO \| Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	426
Net income	101
Common stock dividends	(64)
Preferred security dividends	(1)
Ending Balance	462
PECO ENERGY CO \| Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	1
Ending Balance	$ 1

Consolidated Statement of Changes in Equity (Parenthetical) $ in Millions	3 Months Ended
	Mar. 31, 2010 USD ($)
Statement [Line Items]
Other comprehensive income, income taxes	$ 260
EXELON GENERATION CO LLC
Statement [Line Items]
Other comprehensive income, income taxes	$ 353

Basis of Presentation

3 Months Ended

Mar. 31, 2010

Notes to Financial Statements [Abstract]

Basis of Presentation (Exelon, Generation, ComEd and PECO)

1. Basis of Presentation (Exelon, Generation, ComEd and PECO)

Exelon is a utility services holding company engaged, through its principal subsidia ries, in the generation and energy delivery businesses. The generation business consists of the electric generating facilities, the wholesale energy marketing operations and competitive retail supply operations of Generation. The energy delivery businesses include the purchase and regulated retail sale of electricity and the provision of distribution and transmission services by ComEd in northern Illinois, including the City of Chicago, and by PECO in southeastern Pennsylvania, including the City of Philadelphia, and the purchase and regulated retail sale of natural gas and the provision of distribution services by PECO in the Pennsylvania counties surrounding the City of Philadelphia.

Through its business services subsidiary, BSC, Exelon provides its subsidiaries with a variety of support services at cost, including legal, human resources, financial, information technology and sup ply management services. The costs of BSC, including support services, are directly charged or allocated to the applicable subsidiaries using a cost-causative allocation method. Corporate governance type costs that cannot be directly assigned are allocated based on a Modified Massachusetts formula, which is a method that utilizes a combination of gross revenues, total assets, and direct labor costs for the allocation base. The results of Exelon's corporate operations are presented as "Other" within the consolidated financial statements and include intercompany eliminations unless otherwise disclosed.

Exelon owns 100% of all of its significant consolidated subsidiaries, either directly or ind irectly, except for Exelon SHC, LLC, of which Generation owns 99% and the remaining 1% is indirectly owned by Exelon and eliminated in Exelon's consolidated financial statements, ComEd, of which Exelon owns more than 99%, and PECO, of which Exelon owns 100% of the common stock but none of PECO's preferred securities. Exelon has reflected the third-party interests in ComEd, which totaled less than $1 million at March 31, 2010, as equity, and PECO's preferred securities as preferred securities of subsidiary in its consolidated financial statements.

Exelon's consolidated financial statements include the accounts of entities in which Exelon has a controlling financial interest, other than certain financing trusts of ComEd and PECO, and Generation's and PECO's proportionate interests in jointly owned electric utility property, after the elimination of intercompany transactions. A controlling financial interest is evidenced by either a voting interest greater than 50% or a model that identifies Exelon or one of its subsidiaries as the primary beneficiary of a VIE. Investments and joint ventures in which Exelon does not have a controlling financial interest and certain financing trusts of ComEd and PECO are accounted for under the equity or cost method of accounting.

Each of Generation's, ComEd's and PECO's consolidated financial statements includes the accounts of their subsidiaries. All intercompany transactions have been eliminated.

The accompanying consolidated financial statements as of March 31, 2010 and 2009 and for the three months then ended are unaudited but, in the opinion of the management of each of Exelon, Generation, ComEd and PECO, include all adjustments that are considered necessary for a fair presentation of its respective financial statements in accordance with GAAP. All adjustments are of a normal, recurring nature, except as otherwise disclosed. Certain prior year amounts in Exelon's and Generation's Consolidated Statements of Cash Flows and in ComEd's and PECO's Consolidated Balance Sheets have been reclassified between line items for comparative purposes. The reclassifications did not affect Exelon's or Generation's cash flows from operating activities. The December 31, 2009 Consolidated Balance Sheets were taken from audited financial statements. These Combined Notes to Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the SEC for

Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. These notes should be read in conjunction with the Notes to Consolidated Financial Statements of Exelon, Generation, ComEd and PECO included in ITEM 8 of their 2009 Annua l Report on Form 10-K.

Variable Interest Entities (Exelon, Generation, ComEd and PECO)

Under the applicable authoritative guidance, VIEs are legal entities that possess any of the following characteristics: an insufficient amount of equity at risk to finance their activities, equity owners who do not have the power to direct the significant activities of the entity (or have voting rights that are disproportionate to their ownership interest), or where equity hol ders do not receive expected losses or returns. Entities are required to consolidate a VIE if they are its primary beneficiary.

Generation

Generation's wholesale operations include the physical delivery and marketing of power obtained through its generating capacity, and long-, intermediate- and short-term contracts. Generation also has contracts to purchase fuel supplies for nuclear and fossil generation. These contracts and Generation's membership in Nuclear Electric Insurance Limited are discussed in further detail in Note 18 of the 2009 Form 10-K. Generation has evaluated these contracts and determined that either, it has no variable interest in an entity or, where Generation does have a variable interest in an entity, it is not the primary beneficiary and, therefore, consolidation is not required.

Several of Generation's long-term PPAs have been determined to be operating leases that have no residual value guarantees, bargain purchase options or other provisions that would cause these operating leases to be variable interests, and therefore not subject to this guidance. For con tracts where Generation has a variable interest, Generation has considered which interest holder has the power to direct the activities that most significantly impact the economic performance of the VIE and thus is considered the primary beneficiary and is required to consolidate the entity. The primary beneficiary must also have exposure to significant losses or the right to receive significant benefits from the VIE. In general, the most significant activity of the VIEs is the operation and maintenance of the facilities, which provides the operator with the power to direct the VIEs' activities. Facilities represent power plants, sources of uranium and fossil fuels, or plants used in the uranium conversion, enrichment and fabrication process. Generation does not have control over the operation and maintenance of the facilities considered VIEs and it does not bear operational risk of the facilities. Furthermore, Generation has no debt or equity investments in the entities, under the contracts Generation receives less than the majority of the output of the remaining expected useful life of the facilities, and Generation does not provide any other financial support through liquidity arrangements, guarantees or other commitments other than purchase commitments described in Note 12—Commitments and Contingencies. Upon consideration of these factors, Generation does not consider itself to be the primary beneficiary of these VIEs and, accordingly, has determined that consolidation is not required.

Generation has aggregated its contracts with VIEs into two categories, energy commitments and fuel purchase obligations, based on the similar risk characteristics and significance to Generation. As of the balance sheet date, the carrying amount of assets and liabilities in Generation's Consolidated Balance Sheet that relate to its involvement with VIEs are predominately related to working capital accounts and generally represent the amounts owed by Generation for the deliveries associated with the current billing cycle under the contracts. Further, Generation has not provided or guaranteed any debt or equity support, liquidity arrangements, performance guarantees or other commitments associated with these contracts, so there is no significant potential exposure to loss as a result of its involvement with the VIEs.

ComEd< /font>

ComEd's retail operations include the physical purchase of electricity and RECs through procurement contracts of varying durations. These contracts are discussed in further detail in Notes 2 and 18 of the 2009 Form 10-K. ComEd has evaluated these contracts and determined that either it has no variable interest in the VIE or where ComEd does have a variable interest in the VIE, it is not the primary beneficiary and therefore consolidation is not required.

PECO

New Accounting Pronouncements	3 Months Ended
New Accounting Pronouncements	Mar. 31, 2010
Notes to Financial Statements [Abstract]
New Accounting Pronouncements (Exelon, Generation, ComEd and PECO)	p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"2/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"./fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"New Accounting Pronouncements (Exelon, Generation, ComEd and PECO)br/ /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"The Registrants adopted the following recently issued accounting standards:/font/p t;p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:0px;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:27px;"Transfers of Financial Assets/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:0px;"#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"In June 2009, the FASB issued authoritative guidance /fontfont style="font-family:Times New Roman;font-size:10pt;"amending/fontfont style="font-family:Times New Roman;font-size:10pt;" the acco unting for /fontfont style="font-family:Times New Roman;font-size:10pt;"transfers of financial assets. /fontfont style="font-family:Times New Roman;font-size:10pt;"This guidance/fontfont style="font-family:Times New Roman;font-size:10pt;" was/fontfont style="font-family:Times New Roman;font-size:10pt;" effective/fontfont style="font-family:Times New Roman;font-size:10pt;" and applied prospectively/fontfont style="font-family:Times New Roman;font-size:10pt;" for the Regist/fontfont style="font-family:Times New Roman;font-size:10pt;"rants beginning January 1, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"The /fontfont style="font-family:Times New Roman;font-size:10pt;"impact of the adoption/fontfont style="font-family:Times New Roman;font-size:10pt;" for Exelon and PECO/fontfont style="font-family:Times New Roman;font-size:10pt;" and relevant disclosure/fontfont style="font-family:Times New Roman;font-size:10pt;" is included in /fontfont style="font-family:Times New Roman;font-size:10pt;"Note /fontfont style="font-family:Times New Roman;font-size:10pt;"5/fontfont style="font-family:Times New Roman;font-size:10pt;" #8211; Debt and Credit Agreements./fontfont style="font-family:Times New Roman;font-size:10pt;" The /fontfont style="font-family:Times New Roman;font-size:10pt;"adoption of this /fontfont style="font-family:Times New Roman;font-size:10pt;"guidance /fontfont style="font-family:Times New Roman;font-size:10pt;"did not impact/fontfont style="font-family:Times New Roman;font-size:10pt;" Generation/fontfont style="font-family:Times New Roman;font-size:10pt;"'s/font ;font style="font-family:Times New Roman;font-size:10pt;" or ComEd/fontfont style="font-family:Times New Roman;font-size:10pt;"'s results of operations, cash flows or financial positions/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:18.05px;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"Consolidation of Variable Interest Entities/fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:it alic;margin-left:0px;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In June 2009, the FASB issued authoritative guidance to amend the manner in which entities evaluate whether consolidation is required for VIEs. The model for determining which enterprise has a controlling financial interest and is the primary beneficiary of a VIE has changed significantly under the new guidance. Furthermore, this guidance requires that companies continually evaluate VIEs for consolidation rather than assessing based upon the occurrence of triggering events. This revised guidance also requires enhanced disclosures about how a company's involvement with a VIE affects its financial statements and exposure to risks. This guidance became effective for the Registrants on January#160;1, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-fa mily:Times New Roman;font-size:10pt;"resulted in/fontfont style="font-family:Times New Roman;font-size:10pt;" the consolidation of PETT within /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon's and /fontfont style="font-family:Times New Roman;font-size:10pt;"PECO's financial statements/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;" See /fontfont style="font-family:Times New Roman;font-size:10pt;"Note 1 #8211; Basis of Presentation for the impact of adoption./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"The adoption of this guidance did not impact Generation's or ComEd's results of operations, cash flows or financial positions. lt;/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:18px;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"Fair Value Measurements Disclosures /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In January 2010, the FASB issued authoritative guidance intended to improve disclosures about fair value measurements. The guidance requires entities to disclose significant transfers in and out of fair value hierarchy levels and the reasons for the transfers. Additionally, the guidance clar ifies that a reporting entity should provide fair value measurements for each class of assets and liabilities and disclose the inputs and valuation techniques used for fair value measurements using significant other observable inputs (Level 2) and significant unobservable inputs (Level 3). /fontfont style="font-family:Times New Roman;font-size:10pt;"Currently, t/fontfont style="font-family:Times New Roman;font-size:10pt;"he Registrants' mark-to-market derivative assets and liabilities are the only fair value /fontfont style="font-family:Times New Roman;font-size:10pt;"measurements/fontfont style="font-family:Times New Roman;font-size:10pt;" impacted by this guidance. /fontfont style="font-family:Times New Roman;font-size:10pt;"This guidance is effective for interim and annual periods beginning after December#160;15, 2009. As this guidance provides only disclosure requirements, the adoption of this standard /fontf ont style="font-family:Times New Roman;font-size:10pt;"did not/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"impact/fontfont style="font-family:Times New Roman;font-size:10pt;" the Registrants' results of operations, cash flows or financial positions. /fontfont style="font-family:Times New Roman;font-size:10pt;" See Note 4 /fontfont style="font-family:Times New Roman;font-size:10pt;"#8211; Fair Value of Financial Assets and /fontfont style="font-family:Times New Roman;font-size:10pt;"L/fontfont style="font-family:Times New Roman;font-size:10pt;"iabilities /fontfont style="font-family:Times New Roman;font-size:10pt;"for additional information./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style ="font-family:Times New Roman;font-size:10pt;margin-left:0px;"The following rece/fontfont style="font-family:Times New Roman;font-size:10pt;"ntly issued accounting standard is/fontfont style="font-family:Times New Roman;font-size:10pt;" not yet reflected in /fontfont style="font-family:Times New Roman;font-size:10pt;"the combined /fontfont style="font-family:Times New Roman;font-size:10pt;"consolidated /fontfont style="font-family:Times New Roman;font-size:10pt;"financial statements of the Registrants:/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:18px;"Revenue Arrangements with Multiple Deliverables /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font- size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In October 2009, the FASB issued authoritative guidance that amends existing guidance for identifying separate deliverables in a revenue-generating transaction where multiple deliverables exist, and provides guidance for allocating and recognizing revenue based on those separate deliverables. The guidance is expected to result in more multiple-deliverable arrangements being separable than under current guidance. This guidance is effective for the Registrants beginning on January#160;1, 2011 and is required to be applied prospectively to new or significantly modified revenue arrangements. /fontfont style="font-family:Times New Roman;font-size:10pt;"The Registrants are currently assessing the /fontfont style="font-family:Times New Roman;font-size:10pt;"effects/fontfo nt style="font-family:Times New Roman;font-size:10pt;" this guidance may have on their consolidated financial statements./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/p

Regulatory Matters	3 Months Ended
Regulatory Matters	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Regulatory Matters (Exelon, Generation, ComEd and PECO)	p style='margin-top:16.85pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"3.#160;#160;#160;#160;Regulatory /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Matters/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;" (Exelon, Generation, ComEd and PECO) /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:0px;"Regulatory and Legislative Proceedings (Exelon, Generation, ComEd and PECO)/font/pp style='margin-top:0pt ; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Except /fontfont style="font-family:Times New Roman;font-size:10pt;"for the matters/fontfont style="font-family:Times New Roman;font-size:10pt;" noted below, the /fontfont style="font-family:Times New Roman;font-size:10pt;"disclosures/fontfont style="font-family:Times New Roman;font-size:10pt;" set forth in Note 2 /fontfont style="font-family:Times New Roman;font-size:10pt;"of/fontfont style="font-family:Times New Roman;font-size:10pt;" the 2009 /fontfont style="font-family:Times New Roman;font-size:10pt;"Form 10-K appropriately represent, in all material respects, the current status of regulatory /fontfont style="font-family:Times New Roman;font-size:10pt;"and legislative proceedings of the Registrants/ fontfont style="font-family:Times New Roman;font-size:10pt;". The following /fontfont style="font-family:Times New Roman;font-size:10pt;"is an update to that discussion/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" Settlement Agreement (Exelon, Generation and ComEd/fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;")./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Various /fontfont style="font-family:Times New Roman;font-size:10pt;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;" electric utilities, their affiliates and generators of electricity in /fontfont style="font-family:Times New Roman;font-size:10pt;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;" agreed to contribute approximately $1 billion over a period of four years (2007-2010) to programs to provide rate relief to /fontfont style="font-family:Times New Roman;font-size:10pt;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;" electricity customers and funding for the IPA/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" created/fontfont style="font-family:Times New Roman;font-size:10pt;" as a result of the/fontfont style="font-family:Times New Roman;font-size:10pt;" I/fon tfont style="font-family:Times New Roman;font-size:10pt;"llinois Settlement Legislation. /fontfont style="font-family:Times New Roman;font-size:10pt;"During the three months ended March 31, 2010 and 2009, Generation recognized net costs from its contributions pursuant to the Illinois Settlement/fontfont style="font-family:Times New Roman;font-size:10pt;" Legislation/fontfont style="font-family:Times New Roman;font-size:10pt;" of $/fontfont style="font-family:Times New Roman;font-size:10pt;"2/fontfont style="font-family:Times New Roman;font-size:10pt;" million and $33 million, respectively, in /fontfont style="font-family:Times New Roman;font-size:10pt;"its/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Consolidated Statements of Operations/fontfont style="font-family:Times New Roman;f ont-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"ComEd's net costs from its contributions pursuant to the Illinois Settlement/fontfont style="font-family:Times New Roman;font-size:10pt;" Legislation/fontfont style="font-family:Times New Roman;font-size:10pt;" were $1 million/fontfont style="font-family:Times New Roman;font-size:10pt;" for the three months ended March 31, 2010 and less than $1 million for the same period in 2009./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"As of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/font ;font style="font-family:Times New Roman;font-size:10pt;", Generation's remaining costs to be recognized related to the rate relief commitment are /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"1/fontfont style="font-family:Times New Roman;font-size:10pt;"8/fontfont style="font-family:Times New Roman;font-size:10pt;" million, consisting of /fontfont style="font-family:Times New Roman;font-size:10pt;"$1/fontfont style="font-family:Times New Roman;font-size:10pt;"2/fontfont style="font-family:Times New Roman;font-size:10pt;" million related to programs for ComEd customers and /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"6/fontfont style="font-family:Times New Roman;font-size:10pt;" million for prog rams for customers of other /fontfont style="font-family:Times New Roman;font-size:10pt;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;" utilities. /fontfont style="font-family:Times New Roman;font-size:10pt;"ComEd has no/fontfont style="font-family:Times New Roman;font-size:10pt;" remaining costs to be recognized related to the rate relief commitment as of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" Legislation for Recovery of Un collectible Accounts (Exelon and ComEd)./fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"In /fontfont style="font-family:Times New Roman;font-size:10pt;"2009, comprehensive legislation was enacted into law in /fontfont style="font-family:Times New Roman;font-size:10pt;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;" which provides public utility companies the ability to recover from or refund to customers the difference between /fontfont style="font-family:Times New Roman;font-size:10pt;"the /fontfont style="font-family:Times New Roman;font-size:10pt;"utility/fontfont style="font-family:Times New Roman;font-size:10pt;"'s annual/fontfont style="font-family:Times New Roman;font-size:10pt;" uncollectible accounts expense and amounts collected/fontfont style="font-family:Times New Roman;font-size:10pt;" in /fontfont style="font-family:Times New Roman;font-size:10pt;"rates annually through a rider mechanism, starting with 2008 and prospectively. On February 2, 2010, the ICC issued an order adopting ComEd's proposed tariffs filed in accordance with the legislation, with minor modifications. /fontfont style="font-family:Times New Roman;font-size:10pt;"As a result of the ICC order, ComEd recorded a regulatory asset of $70 million/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"and an offsetting reduction in operating and maintenance expense/fontfont style="font-family:Times New Roman;font-size:10pt;" in the first quarter of 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" for the cumulative under-collections in 2008 and 2009. Re covery of the regulatory asset associated with 2008 and 2009 activities will take place over an approximate 14-month time frame beginning in April 2010. The recovery or refund of the difference in the uncollectible accounts expense applicable to the years starting with January 1, 2010, will take place over a 12-month time frame beginning in June of the following year. In addition, ComEd recorded a one-time charge of $10 million to operating and maintenance expense in the first quarter of 2010 for a contribution to the Supplemental Low-Income Energy Assistance Fund as required by the legislation. The fund is used to assist low-income residential customers./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Pennsylvania/fontf ont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" Electric and Natural Gas Distribution Rate Cases (Exelon and PECO)./fontfont style="font-family:Times New Roman;font-size:10pt;" On March /fontfont style="font-family:Times New Roman;font-size:10pt;"31/fontfont style="font-family:Times New Roman;font-size:10pt;", 2010, PECO filed separate petitions before the PAPUC for increases of $/fontfont style="font-family:Times New Roman;font-size:10pt;"316/fontfont style="font-family:Times New Roman;font-size:10pt;" million and $/fontfont style="font-family:Times New Roman;font-size:10pt;"44/fontfont style="font-family:Times New Roman;font-size:10pt;" million to its /fontfont style="font-family:Times New Roman;font-size:10pt;"annual /fontfont style="font-family:Times New Roman;font-size:10pt;"service/fontfont style="font- family:Times New Roman;font-size:10pt;" revenues for electric and natural gas delivery, respectively. /fontfont style="font-family:Times New Roman;font-size:10pt;"T/fontfont style="font-family:Times New Roman;font-size:10pt;"he /fontfont style="font-family:Times New Roman;font-size:10pt;"requested /fontfont style="font-family:Times New Roman;font-size:10pt;"rate of return on common equity/fontfont style="font-family:Times New Roman;font-size:10pt;" under the electric and natural gas delivery rate cases /fontfont style="font-family:Times New Roman;font-size:10pt;"is 11./fontfont style="font-family:Times New Roman;font-size:10pt;"7/fontfont style="font-family:Times New Roman;font-size:10pt;"5%. /fontfont style="font-family:Times New Roman;font-size:10pt;"The requested increase in delivery rates for electric and natural gas as a result of the rate cases is 6.94% and 5.28%, respectively. /fontfont style="font-family:Times New Roman;font-size:10pt;"T/fontfont style="font-family:Times New Roman;font-size:10pt;"he new electric and gas delivery rates would take effect no later than January 1, 2011. The results of the rate case/fontfont style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;" are expected to be known in the fourth quarter of 2010. PECO cannot predict how much of the requested increases the PAPUC will approve./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Pennsylvania/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" Transition-Related Regulatory Matters (Exelon, Generation and PECO)./fontfont style="font-family:Times New Ro man;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"In 2009, the PAPUC entered an Order instituting an investigation into whether PECO's nuclear decommissioning cost adjustment clause (NDCAC), which is a mechanism that allows PECO to recover costs from customers for the decommissioning of seven former PECO nuclear units now owned by Generation, should continue after December 31, 2010. The Pennsylvania Offices of Trial Staff, Consumer Advocate and Small Business Advocate and a group of industrial customers (collectively, the parties) intervened in the proceeding. During the course of the investigation, PECO and the parties reached an agreement, as set forth in a Stipulation and Joint Memorandum filed on February 24, 2010 (Settlement) that PECO is entitled to recover decommissioning costs through the NDCAC beyond December 31, 2010. The Settlement also contained a provision in which it was agreed that PECO would not claim for recovery under the NDCAC any inc remental physical decommissioning costs incurred with respect to any former PECO nuclear unit as a result of an extension of a unit's NRC Operating License. On March 16, 2010, the ALJ issued a Recommended Decision concluding that PECO's NDCAC should remain in effect beyond December 31, 2010, and recommending approval of the Settlement subject to a modification. Specifically, the ALJ stated that the provision regarding the recovery of incremental physical decommissioning costs is outside the scope of this investigation and is more appropriately considered in the NDCAC filings that are made every 5 years. Accordingly, the ALJ declined to approve this provision of the Settlement at this time. On April 8, 2010, the parties filed exceptions to the ALJ's proposed modification of the Settlement. The entire Recommended Decision is subject to PAPUC review. /fontfont style="font-family:Times New Roman;font-size:10pt;"See Note 10 #8212; /fontfont style="font-family:Times New Roman ;font-size:10pt;"Nuclear Decommissioning/fontfont style="font-family:Times New Roman;font-size:10pt;" for additional information. /font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Pennsylvania/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" Procurement Proceedings (Exelon and PECO)./fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;" In 2009/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" the PAPUC approved PECO's DSP Program, under which PECO will provide default electric service following the expiration of electric generati on rate caps on December 31, 2010. Under the DSP Program, PECO is permitted to recover its electricity procurement costs from retail customers without mark-up. During 2009, PECO entered into contracts with terms of 17 to 29 months covering 49% of planned full requirements contracts for the residential customer class, contracts with 17-month terms covering 24% of planned full requirements contracts for the small commercial customer class and contracts with 17-month terms covering 16% of planned full requirements contracts for the medium commercial customer class. PECO also entered into block contracts with 12-month terms for a total of 80 MW for service to the residential customer class in 2011. PECO will conduct seven additional competitive procurements over the remainder of the term of the DSP Program/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" which expires May 31, 2013. /fontfont st yle="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"These block contracts were executed in accordance with the PAPUC-approved DSP Program, and PECO will receive full cost recovery in rates. /fontfont style="font-family:Times New Roman;font-size:10pt;"As of March 31, 2010, PECO recorded a mark-to-market liability and an offsetting regulatory asset to account for changes in /fontfont style="font-family:Times New Roman;font-size:10pt;"the /fontfont style="font-family:Times New Roman;font-size:10pt;"fair value/fontfont style="font-family:Times New Roman;font-size:10pt;" of the/fontfont style="font-family:Times New Roman;font-size:10pt;" block/fontfont style="font-family:Times New Roman;font-size:10pt;" contracts/fontfont style="font-family:Times New Roman;font-size:10pt;" as shown in the /fontfont style="font-fa mily:Times New Roman;font-size:10pt;"R/fontfont style="font-family:Times New Roman;font-size:10pt;"egulatory /fontfont style="font-family:Times New Roman;font-size:10pt;"A/fontfont style="font-family:Times New Roman;font-size:10pt;"ssets and /fontfont style="font-family:Times New Roman;font-size:10pt;"L/fontfont style="font-family:Times New Roman;font-size:10pt;"iabilities tables below. /font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"As part of the 2009 settlement of the DSP Program, PECO was required to file a Revised Electric Purchase of Receivables (POR)/fontfont style="font-family:Times New Roman;font-size:10pt;" program/fontfont style="font-family:Times New Roman;font-size:10pt;" that required PECO to purchase the customer accounts receivable of Electric Generation Suppliers (EGS) t hat participate in the electric customer choice program under the Competition Act./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"The Revised Electric POR /fontfont style="font-family:Times New Roman;font-size:10pt;"program/fontfont style="font-family:Times New Roman;font-size:10pt;" was filed on November 20, 2009, and provides for full recovery of PECO's system implementation costs for program administration through a temporary discount on purchased receivables. /fontfont style="font-family:Times New Roman;font-size:10pt;"On March 22, 2010, a Joint Petition for Partial Settlement of PECO's revised electric /fontfont style="font-family:Times New Roman;font-size:10pt;"POR/fontfont style="font-family:Times New Roman;font-size:10pt;" program was file d with the PAPUC./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"In addition to considering the settlement timing, t/fontfont style="font-family:Times New Roman;font-size:10pt;"he PAPUC must decide other terms of the revised /fontfont style="font-family:Times New Roman;font-size:10pt;"program/fontfont style="font-family:Times New Roman;font-size:10pt;", including whether PECO can terminate electric service to customers after January 1, 2011, based on unpaid charges for /fontfont style="font-family:Times New Roman;font-size:10pt;"EGS/fontfont style="font-family:Times New Roman;font-size:10pt;" service incurred before that date, /fontfont style="font-family:Times New Roman;font-size:10pt;"and /fontfont style="font-family:T imes New Roman;font-size:10pt;"whether uncollectible expense should be recovered through distribution rates or through a discount on receivables purchased from EGSs and an additional charge for PECO's default service customers. An ALJ Initial Decision is expected in the second quarter of 2010./font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Smart Meter and Smart Grid Investments (Exelon and PECO). /fontfont style="font-family:Times New Roman;font-size:10pt;"On November 25, 2009, PECO filed a joint petition for partial settlement of its $550 million Smart Meter Procurement and Installation Plan with the PAPUC, which was filed on August 14, 2009 in accordance with the requirements of Act 129. PECO is requesting PAPUC approval to install more than 1.6 million smart meters and deploy advanced communication networks over a 15/fontfont styl e="font-family:Times New Roman;font-size:10pt;"-/fontfont style="font-family:Times New Roman;font-size:10pt;"year period. /fontfont style="font-family:Times New Roman;font-size:10pt;"On January 28, 2010, the ALJ issued an initial decision approving the partial settlement and determining remaining cost allocation issues subject to final PAPUC approval./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"On April 22, 2010, the PAPUC approved PECO's Smart Meter Procurement and Installation /fontfont style="font-family:Times New Roman;font-size:10pt;"Plan/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" PECO plans to file for PAPUC approval of an initial dynamic pricing and customer acceptance program in June 2010 and for approval of a universal meter deployment plan for its remaining customers in 2012. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Effective April 12, 2010, PECO has entered into a Financial Assistance Agreement with the DOE for SGIG funds under the ARRA. Under the SGIG, PECO /fontfont style="font-family:Times New Roman;font-size:10pt;"has been awarded/fontfont style="font-family:Times New Roman;font-size:10pt;" $200 million, the maximum grant /fontfont style="font-family:Times New Roman;font-size:10pt;"awarded /fontfont style="font-family:Times New Roman;font-size:10pt;"under the program, for its SGIG project #8211; Smart Future Greater Philad elphia. /fontfont style="font-family:Times New Roman;font-size:10pt;"As a result of the SGIG funding, PECO will deploy 600,000 smart meters within three years, accelerate universal deployment of more than 1.6 million smart meters from 15 years to 10 years and increase Smart Grid investments /fontfont style="font-family:Times New Roman;font-size:10pt;"to/fontfont style="font-family:Times New Roman;font-size:10pt;" approximately $100 million over the next three years. The $200 million SGIG funds will be recovered ratably based on projected spending of $436 million for the project. The project budget includes approximately $7 million related to demonstration projects by two sub-recipients. The SGIG is considered non-taxable based on recent IRS guidance. The DOE has authorized PECO to encumber project property and equipment that is subject to PECO's existing mortgage, with the DOE assuming a/fontfont style="font-family:Times New Roman;font-size:10pt; "n interest that is subordinate /fontfont style="font-family:Times New Roman;font-size:10pt;"to the mortgage. In total, over the next ten years, PECO is planning to spend up to a total of $650 million on its smart grid and smart meter infrastructure. The $200 million SGIG from the DOE will be used to significantly reduce the impact of those investments on PECO ratepayers./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Energy Efficiency Program/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" (Exelon and PECO)/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"./fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;" amp;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Pursuant to Act 129's /fontfont style="font-family:Times New Roman;font-size:10pt;"EEamp;C/fontfont style="font-family:Times New Roman;font-size:10pt;" reduction targets, PECO filed its EEamp;C plan with the PAPUC and received partial approval in 2009. /fontfont style="font-family:Times New Roman;font-size:10pt;"On February 11, 2010, the PAPUC approved PECO's revisions to the EEamp;C plan./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"The approved plan totals more than $330 million which is recoverable from ratepayers. /fontfont style="font-family:Times New Roman;font-size:10pt;"As of March 31, 2010, PECO recorded a regulatory /fontfont style="font-family:Times New Roman;font-size:10pt;"liabil ity/fontfont style="font-family:Times New Roman;font-size:10pt;" for /fontfont style="font-family:Times New Roman;font-size:10pt;"revenue billed, net of expenses incurred /fontfont style="font-family:Times New Roman;font-size:10pt;"for the EEamp;C plan as shown in the /fontfont style="font-family:Times New Roman;font-size:10pt;"R/fontfont style="font-family:Times New Roman;font-size:10pt;"egulatory /fontfont style="font-family:Times New Roman;font-size:10pt;"A/fontfont style="font-family:Times New Roman;font-size:10pt;"ssets and /fontfont style="font-family:Times New Roman;font-size:10pt;"L/fontfont style="font-family:Times New Roman;font-size:10pt;"iabilities tables below. During the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" months ended March 31, 2010, PECO recorded /fontfont style="font-family:Times New Roman;font-size:10pt;"recoverable operating expenses and an equal and offsetting operating revenue related to the energy efficiency program as shown in the Operating and Maintenance for Regu/fontfont style="font-family:Times New Roman;font-size:10pt;"latory Required Programs table /fontfont style="font-family:Times New Roman;font-size:10pt;" below./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Alternative Energy Portfolio Standards/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" (Exelon and PECO)/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"./fontf ont style="font-family:Times New Roman;font-size:10pt;"#160;#160;#160;#160;PECO will be required to comply with the AEPS Act following the end of the electric generation rate cap transition period. PECO has entered into five-year agreements with accepted bidders, including Generation, totaling 452,000 AECs to be purchased annually, in order to prepare for 2011, PECO's first year of required compliance./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" In 2009, the PAPUC approved a settlement of PECO's petition for early procurement and banking of up to 8,000 solar Tier 1 AECs annually for /fontfont style="font-family:Times New Roman;font-size:10pt;"10/fontfont style="font-family:Times New Roman;font-size:10pt;" years. /fontfont style="font-family:Times New Roman;font-size:10pt;"On March 3, 2010, PECO announced that it had entered in to 10-year agreements to purchase 8,000 solar Tier 1 AECs annually. /fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;" /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:0px;"Regulatory Assets and Liabilities (Exelon, ComEd and PECO)/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"Exelon, ComEd and PECO prepare their consolidated financial statements in accordance with the authoritative guidance for accounting for certain types of regulation. Under this g uidance, regulatory assets represent incurred or accrued costs that have been deferred because/fontfont style="font-family:Times New Roman;font-size:10pt;" of their/fontfont style="font-family:Times New Roman;font-size:10pt;" probable future recovery from customers through /fontfont style="font-family:Times New Roman;font-size:10pt;"regulated rates/fontfont style="font-family:Times New Roman;font-size:10pt;". Regulatory liabilities represent/fontfont style="font-family:Times New Roman;font-size:10pt;" the/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"excess recovery of costs /fontfont style="font-family:Times New Roman;font-size:10pt;"or accrued credits that have been deferred because /fontfont style="font-family:Times New Roman;font-size:10pt;"it is probable /fontfont style="fon t-family:Times New Roman;font-size:10pt;"such amounts/fontfont style="font-family:Times New Roman;font-size:10pt;" will be return/fontfont style="font-family:Times New Roman;font-size:10pt;"ed/fontfont style="font-family:Times New Roman;font-size:10pt;" to customers /fontfont style="font-family:Times New Roman;font-size:10pt;"through/fontfont style="font-family:Times New Roman;font-size:10pt;" future/fontfont style="font-family:Times New Roman;font-size:10pt;" regulated/fontfont style="font-family:Times New Roman;font-size:10pt;" rates./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The following tables provide information about the regulatory assets and liabilities of Exelon, ComEd and PECO as of March 31, 2010 and Dec ember 31, 2009. For additional information on the specific regulatory assets and liabilities, refer to Note 19 /fontfont style="font-family:Times New Roman;font-size:10pt;"of/fontfont style="font-family:Times New Roman;font-size:10pt;" the 2009 Form 10-K. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td colspan="2" style="width: 459px; text-align:left;border-color:#000000;min-width:459px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"March 31, 2010/font/tdtd colspan="2" style="width: 52px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:52px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New R oman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 52px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:52px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"ComEd/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 52px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:52px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"PECO/font/td/trtr style="height: 7px"td style="width: 30px; text-align:left;border-color:#000000;min-width:30px;" t;#160;/tdtd style="width: 429px; text-align:left;border-color:#000000;min-width:429px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/td/trtr style="heig ht: 17px"td colspan="2" style="width: 459px; text-align:left;border-color:#000000;min-width:459px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Regulatory assets/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; 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border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"339/font/td/trtr style="height: 18p x"td colspan="2" style="width: 459px; text-align:left;border-color:#000000;min-width:459px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/td/tr/table/divp st yle='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"__________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:9pt;margin-left:0px;"(/fontfont style="font-family:Times New Roman;font-size:9pt;"a/fontfont style="font-family:Times New Roman;font-size:9pt;")#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:9pt;"These amounts represent future nuclear decommissioning costs that are less than the associated /fontfont style="font-family:Times New Roman;font-size:9pt;"NDT/fontfont style="font-family:Times New Roman;font-size:9pt;" fund assets. /fontfont style="font-family:Times New Roman;font-size:9pt;"The/fontfont style ="font-family:Times New Roman;font-size:9pt;"se/fontfont style="font-family:Times New Roman;font-size:9pt;" regulatory liabilit/fontfont style="font-family:Times New Roman;font-size:9pt;"ies/fontfont style="font-family:Times New Roman;font-size:9pt;" /fontfont style="font-family:Times New Roman;font-size:9pt;"have /fontfont style="font-family:Times New Roman;font-size:9pt;"an equal and offsetting noncurrent receivable from affiliate at ComEd and PECO, and a noncurrent payable to affiliate recorded at Generation equal to the/fontfont style="font-family:Times New Roman;font-size:9pt;" total/fontfont style="font-family:Times New Roman;font-size:9pt;" regulatory liability at Exelon, ComEd and PECO./fontfont style="font-family:Times New Roman;font-size:9pt;" /fontfont style="font-family:Times New Roman;font-size:9pt;"See Note 10 #8212; 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text-align:left;border-color:#000000;min-width:57px;"#160;/tdtd style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"#160;/tdtd style="width: 15px; text-align:center;border-color:#000000;min-width:15px;"#160;/tdtd style="width: 57px; text-align:left;border-color:#000000;min-width:57px;"#160;/tdtd style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"#160;/tdtd style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"#160;/tdtd style="width: 57px; text-align:left;border-color:#000000;min-width:57px;"#160;/tdtd style="width: 15px; text-align:left;border-color:#000000;min-width:15px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 364px; text-align:left;border-color:#000000;min-width:364px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total operating and maintenance for regulatory required programs/font/tdtd style="width: 15px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:15px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 57px; 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margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"__________/font /pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:9pt;margin-left:0px;"(/fontfont style="font-family:Times New Roman;font-size:9pt;"a/fontfont style="font-family:Times New Roman;font-size:9pt;")#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:9pt;"As a result of the Illinois Settlement/fontfont style="font-family:Times New Roman;font-size:9pt;" Legislation/fontfont style="font-family:Times New Roman;font-size:9pt;", utilities are required to provide energy efficiency and demand response programs. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:9pt;margin-left:0px;"(/fontfont style="font-family:Times New Roman;font-size:9pt;"b/fontfont style="font-family:Times New Roman;font-si ze:9pt;")#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:9pt;"In 2009, /fontfont style="font-family:Times New Roman;font-size:9pt;"the PAPUC authorized /fontfont style="font-family:Times New Roman;font-size:9pt;"PECO to collect a surcharge to /fontfont style="font-family:Times New Roman;font-size:9pt;"recover/fontfont style="font-family:Times New Roman;font-size:9pt;" expenditures associated with PECO's approved consumer education plan related to the transition to competitive energy market prices. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'#160;/p

Fair Value of Financial Assets and Liabilities	3 Months Ended
Fair Value of Financial Assets and Liabilities	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Fair Value of Financial Assets and Liabilities (Exelon, Generation, ComEd and PECO)	p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"4. Fair Value of Financial Assets and Liabilities (Exelon, Generation, ComEd and PECO)/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:18px;"Non-Derivative Financial Assets and Liabilities/fontfont style="font-family:Times New Roman;font-size:10pt;". As of March 31, 2010 and December 31, 2009, the Registrants' carrying/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"amounts of cash and cash equivalents, accounts receivable, accounts payable, short-term note s payable and accrued liabilities are representative of fair value because of the short-term nature of these instruments./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:18px;"Fair Value of Financial Liabilities Recorded at the Carrying Amount/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:18px;"Exelon/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The carrying amounts and fair values of Exelon's long-term debt and spent nuclear fuel obligation as of /fontfont style="font-family:Times New Roman;font-size:10pt;" March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"December 31, 2009 were as follows:/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 337px; text-align:left;border-color:#000000;min-width:337px;"#160;/tdtd colspan="5" style="width: 129px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:129px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIG N: center;"March 31, 2010/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 129px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:129px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"December 31, 2009/font/td/trtr style="height: 26px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 337px; text-align:left;border-color:#000000;min-width:337px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALI GN: center;"Carrying Amount /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fair Value /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Carrying Amount /font/tdtd style="width: 5px; text-align:center;border-c olor:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fair Value /font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Long-term debt (including amounts due within one year)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FA MILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"11,635/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"12,256/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style ="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"11,634/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"12,223/font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Long-term debt of variable interest entity due within one year (a)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160; /tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"404/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"414/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/td lt;td style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Long-term debt to PETT due within one year (a)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"415/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/td ;td style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"426/font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Long-term debt to financing trusts/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"390/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"338/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"390/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"325/font/td/trtr style="height: 17px" gt;td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Spent nuclear fuel obligation/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,017/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"887/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-wid th:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"1,017/font/tdtd style="width: 5px; text-align:right;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"832/font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Preferred securit ies of subsidiary/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"87/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"70/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-colo r:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"87/font/tdtd style="width: 5px; text-align:right;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"63/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:3pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:8pt;margin-left:0px;"(a) /fontfont style="font-famil y:Times New Roman;font-size:8pt;" /fontfont style="font-family:Times New Roman;font-size:8pt;"On January 1, 2010, PETT was consolidated in Exelon's Consolidated Financial Statements in accordance /fontfont style="font-family:Times New Roman;font-size:8pt;"with the /fontfont style="font-family:Times New Roman;font-size:8pt;"new /fontfont style="font-family:Times New Roman;font-size:8pt;"FASB /fontfont style="font-family:Times New Roman;font-size:8pt;"authoritative guidance /fontfont style="font-family:Times New Roman;font-size:8pt;"related to/fontfont style="font-family:Times New Roman;font-size:8pt;" the consolidation of /fontfont style="font-family:Times New Roman;font-size:8pt;"VIE/fontfont style="font-family:Times New Roman;font-size:8pt;"s. See/fontfont style="font-family:Times New Roman;font-size:8pt;" Note /fontfont style="font- family:Times New Roman;font-size:8pt;"1/fontfont style="font-family:Times New Roman;font-size:8pt;" #8211; Basis of Presentation for additional information./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:18px;"Generation/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The carrying amounts and fair values of Generation's long-term debt and spent nuclear fuel obligations as of March 31, 2010 and December 31, 2009 were as follows:/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:coll apse;margin-top:20px;"tr style="height: 17px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 333px; text-align:left;border-color:#000000;min-width:333px;"#160;/tdtd colspan="5" style="width: 129px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:129px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"March 31, 2010/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 129px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:129px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"December 31, 2009/font/td/trtr style="hei ght: 24px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 333px; text-align:left;border-color:#000000;min-width:333px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Carrying Amount /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fair Value /font t;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Carrying Amount /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fair Value /font/td/trtr style="height: 17px"td colspan="2" style="width: 358px; text-align:lef t;border-color:#000000;min-width:358px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Long-term debt (including amounts due within one year)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,992/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"f ont style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3,137/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,993/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;" t;font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3,132/font/td/trtr style="height: 17px"td colspan="2" style="width: 358px; text-align:left;border-color:#000000;min-width:358px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Spent nuclear fuel obligation/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,017/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"887/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"1,017/font/tdtd style="width: 5px; text-align:right;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"832/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;' gt;/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:18px;"ComEd/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The carrying amounts and fair values of ComEd's long-term debt as of March 31, 2010 and December 31, 2009 were as follows:/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 337px; text-align:left;border-color:#000000;min-width:337px;"#160;/tdtd colspan="5" style="width: 129px; border-bottom-style:solid;border-bottom-width:1px;text-al ign:center;border-color:#000000;min-width:129px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"March 31, 2010/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 129px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:129px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"December 31, 2009/font/td/trtr style="height: 26px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 337px; text-align:left;border-color:#000000;min-width:337px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-al ign:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Carrying Amount /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fair Value /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New R oman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Carrying Amount /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fair Value /font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Long-term debt (including amounts due within one year)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT - -ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"4,712/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5,053/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #0000 00;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"4,711/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5,062/font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Long-term debt to financing trust /font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"206/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"170/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width :50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"206/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"167/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:18px;"PECO/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The carrying amounts and fair value/fontfont style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;" of PECO's long-term debt and preferred securities as of March 31, 2010 and December 31, 2009 were as follows:/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 337px; text-align:left;border-color:#000000;min-width:337px;"#160;/tdtd colspan="5" style="width: 129px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:129px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"March 31, 2010/font/tdtd style="widt h: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 129px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:129px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"December 31, 2009/font/td/trtr style="height: 25px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 337px; text-align:left;border-color:#000000;min-width:337px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Carrying Amount /font/tdtd style= "width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fair Value /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Carrying Amount /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fair Value /font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Long-term debt (including amounts due within one year)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,221/fon t/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,366/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,221 lt;/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,346/font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Long-term debt of variable interest entity due within one year (a)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#0000 00;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"404/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"414/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5 px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Long-term debt to PETT due within one year (a)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;" gt;#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"415/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-wid th:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"426/font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Long-term debt to financing trusts/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"184/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="F ONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"168/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"184/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"158/font/td/trtr style="height: 17px"td colspan="2" style="width: 362px; text-align:left;border-color:#0 00000;min-width:362px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Preferred securities/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"87/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"70/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-c olor:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"87/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"63/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:3pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font- size:8pt;margin-left:0px;"(a) /fontfont style="font-family:Times New Roman;font-size:8pt;"On January 1, 2010, PETT was consolidated in PECO's Consolidated Financial Statements in accordance /fontfont style="font-family:Times New Roman;font-size:8pt;"with the /fontfont style="font-family:Times New Roman;font-size:8pt;"new /fontfont style="font-family:Times New Roman;font-size:8pt;"FASB /fontfont style="font-family:Times New Roman;font-size:8pt;"authoritative guidance /fontfont style="font-family:Times New Roman;font-size:8pt;"related to/fontfont style="font-family:Times New Roman;font-size:8pt;" the consolidation of /fontfont style="font-family:Times New Roman;font-size:8pt;"VIE/fontfont style="font-family:Times New Roman;font-size:8pt;"s. See Note 1 #8211; Basis of Presentation for additional information./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Recurring Fair Value Measurements /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"To increase consistency and comparability in fair value measurements/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" the FASB established/fontfont style="font-family:Times New Roman;font-size:10pt;" a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three levels as follows: /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-fa mily:Times New Roman;font-size:10pt;margin-left:24.45px;"#8226;#160;#160;#160;#160;#160;#160;#160;Level 1 #8212; quoted prices (unadjusted) in active markets for identical assets or liabilities that the Registrants have the ability to access as of the reporting date. Financial assets and liabilities utilizing Level 1 inputs include active exchange-traded equity securities, exchange-based derivatives, mutual funds and money market funds. /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.45px;"#8226;#160;#160;#160;#160;#160;#160;#160;Level 2 #8212; inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data. Financial assets and liabilities utilizing Level 2 inputs include fixed income sec urities, non-exchange-based derivatives, commingled investment funds /fontfont style="font-family:Times New Roman;font-size:10pt;"priced at NAV per fund share/fontfont style="font-family:Times New Roman;font-size:10pt;" and fair /fontfont style="font-family:Times New Roman;font-size:10pt;"value hedges. /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.45px;"#8226;#160;#160;#160;#160;#160;#160;#160;Level 3 #8212; unobservable inputs, such as internally developed pricing models for the asset or liability due to little or no market activity for the asset or liability. Financial assets and liabilities utilizing Level 3 inputs include infrequently traded non-exchange-based derivatives/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top:0pt; margin- bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Upon Exelon's and Generation's initial adoption of the authoritative guidance for fair value measurements, and in periods since adoption, Exelon and Generation /fontfont style="font-family:Times New Roman;font-size:10pt;"previously/fontfont style="font-family:Times New Roman;font-size:10pt;" classified investments in NDT commingled funds, reported at NAV, within level 3 of the fair value hierarchy. /fontfont style="font-family:Times New Roman;font-size:10pt;"In 2009, t/fontfont style="font-family:Times New Roman;font-size:10pt;"he FASB issued /fontfont style="font-family:Times New Roman;font-size:10pt;"new /fontfont style="font-family:Times New Roman;font-size:10pt;"authoritative guidance, effective for periods ending after December 15, 2009, indi cating that if a reporting entity has the ability to redeem its investment at NAV at the measurement date or at a future date, /fontfont style="font-family:Times New Roman;font-size:10pt;"the investment should/fontfont style="font-family:Times New Roman;font-size:10pt;" be classified as level 2 in the fair value hierarchy. As of December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" and March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", Exelon and Generation continue to report these investments at NAV without adjustment and have classified them within level 2 of the fair value hierarchy in accordance with the guidance./font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:18px;"Exelon/font/pp style='ma rgin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The following table/fontfont style="font-family:Times New Roman;font-size:10pt;"s present/fontfont style="font-family:Times New Roman;font-size:10pt;" assets and liabilities measured and recorded/fontfont style="font-family:Times New Roman;font-size:10pt;" at/fontfont style="font-family:Times New Roman;font-size:10pt;" fair value on Exelon's Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of March 31, 2010 and December 31, 2009:/font/pp style='margin-top: 0pt; 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text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 46px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 39px; text-align:center;border-color:#000000;min-width:39px;"#160;/td/trtr style="height: 17px"td style="width: 314px; text-align:left;border-color:#000000;min-width:314px;"font style="FONT-WEIGHT: bold ;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total liabilities/font/tdtd style="width: 13px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(4)/font/tdtd style="width: 20px; 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border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(273)/font/td gt;td style="width: 39px; text-align:left;border-color:#000000;min-width:39px;"#160;/td/trtr style="height: 9px"td style="width: 314px; text-align:left;border-color:#000000;min-width:314px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/td td style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 46px; text-align:center;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 39px; text-align:center;border-color:#000000;min-width:39px;"#160;/td/trtr style="height: 18px"td style="width: 314px; text-align:left;border-color:#000000;min-width:314px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total net assets/font/tdtd style="width: 13px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #0 00000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"4,902/font/tdtd style="width: 20px; 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border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(2)/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 46px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(2)/font/tdtd style="width: 39px; text-align:left;border-color:#000000;min-width:39px;"#160;/td/trtr style="height: 7px"td style="width: 314px; text-align:left;border-color:#000000;min-width:314px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; text-align:cen ter;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 46px; text-align:center;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 39px; text-align:center;border-color:#000000;min-width:39px;"#160;/td/trtr style="height: 17px"td style="width: 314px; text-align:le ft;border-color:#000000;min-width:314px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total liabilities/font/tdtd style="width: 13px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Time s New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(82)/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(2)/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 46px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Time s New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(84)/font/tdtd style="width: 39px; text-align:left;border-color:#000000;min-width:39px;"#160;/td/trtr style="height: 7px"td style="width: 314px; text-align:left;border-color:#000000;min-width:314px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; text-al ign:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 46px; text-align:center;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 39px; text-align:center;border-color:#000000;min-width:39px;"#160;/td/trtr style="height: 18px"td style="width: 314px; text-align:left;border-color:#000000;min-width:314px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total net assets/font/tdtd style="width: 13px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:13px;" gt;font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3,923/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5,322/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(46)/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 13px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 46px; border-bottom-style:double;border - -bottom-width:3px;text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"9,199/font/tdtd style="width: 39px; text-align:left;border-color:#000000;min-width:39px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:3pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(a)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"Excludes certain cash equivalents#160;considered to be held-to-maturity and not reported at fair value. /fontfont style="font-family:Times New Roman;font-size:7.5p t;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"Includes restricted cash equivalents of VIE at /fontfont style="font-family:Times New Roman;font-size:7.5pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:7.5pt;". See Note /fontfont style="font-family:Times New Roman;font-size:7.5pt;"1/fontfont style="font-family:Times New Roman;font-size:7.5pt;" #8211; Basis of Presentation for additional information on the VIE./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(b)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"Generation's /fontfont style="font-family:Times New Roman;font-size:7.5pt;"NDT/fontfont style="font-family:Times New Roman;font-size:7.5pt;" funds hold equity portfolios whose performance is benchmarked against the Samp;P 500 Index, Russell 3000 Index or Morgan Stanley Capital International Europe, /fontfont style="font-family:Times New Roman;font-size:7.5pt;"Australasia/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and Far East (EAFE) Index./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(c)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"Generation's /fontfont style="font-family:Times New Roman;font-size:7.5pt;"NDT/fontfont style="font-family:Times New Roman;font-size:7.5pt;" funds own commingled funds that invest in both equity and fixed income securities.#160; The commingled funds that invest in equity securities seek to track the performance of the S amp;P 500 Index, Morgan Stanley Capital International EAFE Index and Russell 3000 Index.#160; The commingled funds that hold fixed income securities invest primarily in a diversified portfolio of high grade money market instruments and other short-term fixed income securities. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(d)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"Excludes net /fontfont style="font-family:Times New Roman;font-size:7.5pt;"assets/fontfont style="font-family:Times New Roman;font-size:7.5pt;" of $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"14/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;" t;76/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million/fontfont style="font-family:Times New Roman;font-size:7.5pt;" at March 31, 2010 and December 31, 2009, respectively. These/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"items /fontfont style="font-family:Times New Roman;font-size:7.5pt;"consist/fontfont style="font-family:Times New Roman;font-size:7.5pt;" of receivables/fontfont style="font-family:Times New Roman;font-size:7.5pt;" related to pending securities /fontfont style="font-family:Times New Roman;font-size:7.5pt;"sales/fontfont style="font-family:Times New Roman;font-size:7.5pt;" net of cash, interest receivables and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"payables/fontfont style="font-family:Times New Roman; font-size:7.5pt;" related to pending securities /fontfont style="font-family:Times New Roman;font-size:7.5pt;"purchases/fontfont style="font-family:Times New Roman;font-size:7.5pt;"./fontfont style="font-family:Times New Roman;font-size:7.5pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(e)#160;#160;#160;#160;#160;#160;#160;E/fontfont style="font-family:Times New Roman;font-size:7.5pt;"xcludes $24/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"23/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million of the cash surrender value of life insurance investments at /fontfont style="font-family:Times New Roman;font-size:7.5pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"December 31, 2009/fontfont style="font-family:Times New Roman;font-size:7.5pt;", respectively. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(f/fontfont style="font-family:Times New Roman;font-size:7.5pt;") /fontfont style="font-family:Times New Roman;font-size:7.5pt;"T/fontfont style="font-family:Times New Roman;font-size:7.5pt;"he Level 3 balance does not include current and noncurrent assets for Generation and current and noncurrent liabilities for ComEd of $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"429/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million and $/fontfont style="font-family:Ti mes New Roman;font-size:7.5pt;"806/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million at /fontfont style="font-family:Times New Roman;font-size:7.5pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"302/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"669/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million at /fontfont style="font-family:Times New Roman;font-size:7.5pt;"December 31, 2009/fontfont style="font-family:Times New Roman;font-size:7.5pt;", respectively, related to the fair value of Generation's financial swap contract with ComEd/fontfont style="font-family:Times New Roman;font-size:7.5pt;",/fontfont style="fo nt-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"current and/fontfont style="font-family:Times New Roman;font-size:7.5pt;" noncurrent asset/fontfont style="font-family:Times New Roman;font-size:7.5pt;"s/fontfont style="font-family:Times New Roman;font-size:7.5pt;" of /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$1 million and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$/fontfont style="font-family:Times New Roman;font-size:7.5pt;"5/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million /fontfont style="font-family:Times New Roman;font-size:7.5pt;"at /fontfont style="font-family:Times New Roman;font-size:7.5pt;"March 31, 2010 /fontfont style="font-fa mily:Times New Roman;font-size:7.5pt;"and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"a noncurrent asset/fontfont style="font-family:Times New Roman;font-size:7.5pt;" of /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$2 million /fontfont style="font-family:Times New Roman;font-size:7.5pt;"at/fontfont style="font-family:Times New Roman;font-size:7.5pt;" December 31, 2009, respectively,/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"related to the fair value of Generation's block contracts with PECO, /fontfont style="font-family:Times New Roman;font-size:7.5pt;"which eliminate/fontfont style="font-family:Times New Roman;font-size:7.5pt;" upon consolidation in Exelon's Consolidated Financial Statements. /font/pp style='margin-top:0pt; ma rgin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(g)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"Includes collateral po/fontfont style="font-family:Times New Roman;font-size:7.5pt;"stings received from /fontfont style="font-family:Times New Roman;font-size:7.5pt;"counterparties. Collatera/fontfont style="font-family:Times New Roman;font-size:7.5pt;"l received from counterparties /fontfont style="font-family:Times New Roman;font-size:7.5pt;"totaled $4 million, $1,406 million and $20 million /fontfont style="font-family:Times New Roman;font-size:7.5pt;"allocated to/fontfont style="font-family:Times New Roman;font-size:7.5pt;" Level 1, Level 2 and Level 3 mark/fontfont style="font-family:Times New Roman;font-size:7.5pt;"-to-market derivatives/fo ntfont style="font-family:Times New Roman;font-size:7.5pt;", respectively, as of March 31, 2010. Collateral received from counterparties, net of collateral paid to counterparties, totaled $3 million, $941 million and $3 million /fontfont style="font-family:Times New Roman;font-size:7.5pt;"allocated to/fontfont style="font-family:Times New Roman;font-size:7.5pt;" Level 1, Level 2 and Level 3 mark-to-market derivative/fontfont style="font-family:Times New Roman;font-size:7.5pt;"s/fontfont style="font-family:Times New Roman;font-size:7.5pt;", respectively, as of December 31, 2009./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis during the three months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and 2009/fontfont style="font-family:Times New Roman;font-size:10pt;":/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 51px"td colspan="2" style="width: 414px; text-align:left;border-color:#000000;min-width:414px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2010 (a)/font/tdtd colspan="3" style="width: 73px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:73px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: cen ter;"Mark-to-Market Derivatives /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="3" style="width: 74px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Servicing Liability /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 52px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:52px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Total/font/td/trtr style="height: 15px"td colspan="2" style="width: 414px; text-align:left;border-color:#000000;min-width:414px;" ;font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Balance as of December 31, 2009/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 39px; text-align:right;border-color:#000000;min-width:39px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(44)/font/tdtd style="width: 22px; text-align:left;border-color:#000000;min-width:22px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; text-align:right;border - -color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(2)/font/tdtd style="width: 22px; text-align:left;border-color:#000000;min-width:22px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(46)/font/td/trtr style="height: 15px"td colspan="2" style="width: 414px; text-align:left;border-color:#000000;min-width:414px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total realized / unrealized (losses) gains/font/tdtd style="width: 12px; 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text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 22px; text-align:left;border-color:#000000;min-width:22px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-a lign:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 324px; text-align:left;border-color:#000000;min-width:324px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Included in net income/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 70px; 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text-align:left;border-color:#000000;min-width:5px;" ;#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(2)/font/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 324px; text-align:left;border-color:#000000;min-width:324px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 70px; text-align:center;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style ="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:center;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 22px; text-align:left;border-color:#000000;min-width:22px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/td/trtr style="height: 18px"td colspan="2" st yle="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Balance as of March 31, 2009/font/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 70px; 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border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt;COLOR: #000000;"(2)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,417/font/td/trtr style="height: 18px"td colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"The amount of total losses included in net income /font/tdtd style="width: 12px; text-align:center; 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text-align:left;border-color:#000000;min-width:22px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px ; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(107)/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:3pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-fam ily:Times New Roman;font-size:7.5pt;margin-left:0px;"(a) /fontfont style="font-family:Times New Roman;font-size:7.5pt;"Includes the reclassification of /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$18/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million of realized losses due to the settlement of derivative contracts recorded in results of operations./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(b) /fontfont style="font-family:Times New Roman;font-size:7.5pt;"Excludes /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$752/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million changes in fair value and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$/fontfont style="font-family:Times New Roman;fo nt-size:7.5pt;"26/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million of realized losses due to settlements during /fontfont style="font-family:Times New Roman;font-size:7.5pt;"2009/fontfont style="font-family:Times New Roman;font-size:7.5pt;" of Generation's financial swap contract with ComEd, which eliminates upon consolidation in Exelon's Consolidated Financial Statements./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The following table presents total realized and unrealized gains (losses) included in income for Level 3 assets and liabilities measured at fair value on a recurring basis during the three months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman ;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009:/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 25px"td colspan="2" style="width: 397px; text-align:left;border-color:#000000;min-width:397px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2010/font/tdtd colspan="2" style="width: 57px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:57px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Operating Revenue /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" sty le="width: 57px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:57px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Purchased Power /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 42px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:42px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fuel/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 57px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:57px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt ;COLOR: #000000;TEXT-ALIGN: center;"Other, net /font/td/trtr style="height: 17px"td colspan="2" style="width: 397px; text-align:left;border-color:#000000;min-width:397px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total gains (losses) included in net income for the three months ended /font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160; /tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"March 31, 2010/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(2)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"55/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times Ne w Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"26/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2/font/td/trtr style="height: 17px"td colspan="2" style="width: 397px; text-align:left;border-color:#000000;min-width:397px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Change i n the unrealized gains relating to assets and liabilities/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"# 160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"held as of March 31, 2010/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3/font/td td style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"54/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"20/font/td ;td style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/td/trtr style="height: 17px"td colspan="2" style="width: 397px; text-align:left;border-color:#000000;min-width:397px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text- align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/td/trtr style="height: 25px"td colspan="2" style="width: 397px; text-align:left;border-color:#000000;min-width:397px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FON T-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2009/font/tdtd colspan="2" style="width: 57px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:57px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Operating Revenue /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 57px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:57px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Purchased Power /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 42px; border-bottom-style:solid;borde r-bottom-width:1px;text-align:center;border-color:#000000;min-width:42px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fuel/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 57px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:57px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Other, net /font/td/trtr style="height: 17px"td colspan="2" style="width: 397px; text-align:left;border-color:#000000;min-width:397px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total gains (losses) included in net income for the three months ended /font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-w idth:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; t ext-align:left;border-color:#000000;min-width:45px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"March 31, 2009/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(21)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-widt h:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"4/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(51)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-wi dth:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(57)/font/td/trtr style="height: 17px"td colspan="2" style="width: 397px; text-align:left;border-color:#000000;min-width:397px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Change in the unrealized gains (losses) relating to assets and liabilities/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;bord er-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 377px; text-align:left;border-color:#000000;min- width:377px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"held as of March 31, 2009/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FON T-SIZE: 10pt;COLOR: #000000;"2/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(52)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;F ONT-SIZE: 10pt;COLOR: #000000;"(57)/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:18px;"G/fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;"eneration/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The following table/fontfont style="font-family:Times New Roman;font-size:10pt;"s present/fontfont style="font-family:Times New Roman;font-size:10pt;" assets and liabilities measured and recorded/fontfont style="font-family:Times New Roman;font-size:10pt;" at/fontfont style="font-family:Times New Roman;font-size:10p t;" fair value on /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation's/fontfont style="font-family:Times New Roman;font-size:10pt;" Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of March 31, 2010 and December 31, 2009:/font/pp style='margin-top:0pt; 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border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40 px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(23)/font/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/td/trtr style="height: 17px"td style="width: 366px; text-align:left;border-color:#000000;min-width:366px;"#160;/tdtd style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 40px; text- align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 60px; text-align:center;border-color:#000000;min-width:60px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 60px; text-align:center;border-color:#000000;min-width:60px ;"#160;/tdtd style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"#160;/td/trtr style="height: 18px"td style="width: 366px; text-align:left;border-color:#000000;min-width:366px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total net assets/font/tdtd style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:9px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3,081/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/td ;td style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 60px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5,371/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"fon t style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"931/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 60px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"9,383/font/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:3pt'font style="font-family:Times New Roman;f ont-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(a)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"Excludes certain cash equivalents#160;considered to be held-to-maturity and not reported at fair value./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(b)#160;#160;#160;#160;#160;#160;#160;Generation's /fontfont style="font-family:Times New Roman;font-size:7.5pt;"NDT/fontfont style="font-family:Times New Roman;font-size:7.5pt;" funds hold equity portfolios whose performance is benchmarked against the Samp;P 500 Index, Russell 3000 Index or Morgan Stanley Capital International EAFE I ndex./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(c)#160;#160;#160;#160;#160;#160;#160;Generation's /fontfont style="font-family:Times New Roman;font-size:7.5pt;"NDT/fontfont style="font-family:Times New Roman;font-size:7.5pt;" funds own commingled funds that invest in both equity and fixed income securities. The commingled funds that invest in equity securities seek to track the performance of the Samp;P 500 Index, Morgan Stanley Capital International EAFE Index and Russell 3000 Index. The commingled funds that hold fixed income securities invest primarily in a diversified portfolio of high grade money market instruments/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and other short-term fixed income securities. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(d/fontfont style="font-family:Times New Roman;font-size:7.5pt;")#160;#160;#160;#160;#160;#160;#160;Excludes net /fontfont style="font-family:Times New Roman;font-size:7.5pt;"assets/fontfont style="font-family:Times New Roman;font-size:7.5pt;" of /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$14/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$76/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million/fontfont style="font-family:Times New Roman;font-size:7.5pt;" at March 31, 2010 and December 31, 2009, respectively./fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5 pt;" These items consist of /fontfont style="font-family:Times New Roman;font-size:7.5pt;"receivables/fontfont style="font-family:Times New Roman;font-size:7.5pt;" related to pending securities /fontfont style="font-family:Times New Roman;font-size:7.5pt;"sales/fontfont style="font-family:Times New Roman;font-size:7.5pt;" net of cash, interest receivables and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"payables/fontfont style="font-family:Times New Roman;font-size:7.5pt;" related to pending securities /fontfont style="font-family:Times New Roman;font-size:7.5pt;"purchases/fontfont style="font-family:Times New Roman;font-size:7.5pt;"./fontfont style="font-family:Times New Roman;font-size:7.5pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;" t;(e)#160;#160;#160;#160;#160;#160;#160;The mutual funds held by the Rabbi trusts that are invested in common stock of Samp;P 500 companies and Pennsylvania municipal bonds that are primarily rated as investment grade./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(f/fontfont style="font-family:Times New Roman;font-size:7.5pt;")#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"Excludes $7/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million of the cash surrender value of life insurance investments /fontfont style="font-family:Times New Roman;font-size:7.5pt;"at March 31, 2010 and December 31, 2009/fontfont style="font-family:Times New Roman;font-size:7.5pt;"./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(g/fontfont style="font-family:Times New Roman;font-size:7.5pt;")#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"T/fontfont style="font-family:Times New Roman;font-size:7.5pt;"he Level 3 balance includes /fontfont style="font-family:Times New Roman;font-size:7.5pt;"current and noncurrent asset/fontfont style="font-family:Times New Roman;font-size:7.5pt;"s for Generation /fontfont style="font-family:Times New Roman;font-size:7.5pt;"of/fontfont style="font-family:Times New Roman;font-size:7.5pt;" $429/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$806 /fontfont s tyle="font-family:Times New Roman;font-size:7.5pt;"million at March 31, 2010 and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"302/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"669/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million at December 31, 2009, respectively, related to the fair value of Generation's financial swap contract with ComEd/fontfont style="font-family:Times New Roman;font-size:7.5pt;",/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"and/fontfont style="font-family:Times New Roman;font-size:7.5pt;" current /fontfont style="font-family:Times New Roman;font-size:7.5pt;" and /fontfont style="font-family:Times New Roman;font-size:7.5pt;" gt;noncurrent /fontfont style="font-family:Times New Roman;font-size:7.5pt;"asset/fontfont style="font-family:Times New Roman;font-size:7.5pt;"s/fontfont style="font-family:Times New Roman;font-size:7.5pt;" of $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"1/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million /fontfont style="font-family:Times New Roman;font-size:7.5pt;"and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"5/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million /fontfont style="font-family:Times New Roman;font-size:7.5pt;"at /fontfont style="font-family:Times New Roman;font-size:7.5pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:7.5pt;", respectively,/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and lt;/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"a /fontfont style="font-family:Times New Roman;font-size:7.5pt;"noncurrent asset of $2 million at /fontfont style="font-family:Times New Roman;font-size:7.5pt;" December 31, 2009/fontfont style="font-family:Times New Roman;font-size:7.5pt;",/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"related to the fair value of Generation's block contracts/fontfont style="font-family:Times New Roman;font-size:7.5pt;" with PECO/fontfont style="font-family:Times New Roman;font-size:7.5pt;". All of the mark-to-market balances Generation carries associated with the financial swap contract with ComEd and the block contracts with PECO eliminate /fontfont style="font-family:Ti mes New Roman;font-size:7.5pt;"upon consolidation in Exelon's Consolidated Financial Statements/fontfont style="font-family:Times New Roman;font-size:7.5pt;"./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(h/fontfont style="font-family:Times New Roman;font-size:7.5pt;")#160;#160;#160;#160;#160;#160;#160;Includes collateral po/fontfont style="font-family:Times New Roman;font-size:7.5pt;"stings received from /fontfont style="font-family:Times New Roman;font-size:7.5pt;"counterparties. Collatera/fontfont style="font-family:Times New Roman;font-size:7.5pt;"l received from counterparties /fontfont style="font-family:Times New Roman;font-size:7.5pt;"totaled /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$4/fontfont style="font-family :Times New Roman;font-size:7.5pt;" million/fontfont style="font-family:Times New Roman;font-size:7.5pt;", /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$/fontfont style="font-family:Times New Roman;font-size:7.5pt;"1,406/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"million/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$/fontfont style="font-family:Times New Roman;font-size:7.5pt;"20/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"million/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"allocate d to/fontfont style="font-family:Times New Roman;font-size:7.5pt;" Level 1/fontfont style="font-family:Times New Roman;font-size:7.5pt;", /fontfont style="font-family:Times New Roman;font-size:7.5pt;"L/fontfont style="font-family:Times New Roman;font-size:7.5pt;"evel/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"2 /fontfont style="font-family:Times New Roman;font-size:7.5pt;"and Level /fontfont style="font-family:Times New Roman;font-size:7.5pt;"3/fontfont style="font-family:Times New Roman;font-size:7.5pt;" mark/fontfont style="font-family:Times New Roman;font-size:7.5pt;"-to-market derivatives/fontfont style="font-family:Times New Roman;font-size:7.5pt;", respectively, as of /fontfont style="font-family:Times New Roman;font-size:7.5pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:7.5pt;". Collateral received from counterparties, net of collateral pai/fontfont style="font-family:Times New Roman;font-size:7.5pt;"d to counterparties, totaled $3 million, $9/fontfont style="font-family:Times New Roman;font-size:7.5pt;"41 million and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"3/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million /fontfont style="font-family:Times New Roman;font-size:7.5pt;"allocated to/fontfont style="font-family:Times New Roman;font-size:7.5pt;" Level 1,/fontfont style="font-family:Times New Roman;font-size:7.5pt;" Level 2/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and Level 3 mark/fontfont style="font-family:Times New Roman;font-size:7.5pt;"-to-market derivatives/fontfont style="font - -family:Times New Roman;font-size:7.5pt;", respectively, as of December 31, 2009./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The following tables present the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis during the three months ended March 31, 2010 and 2009:/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 15px"td colspan="2" style="width: 528px; text-align:left;border-color:#000000;min-width:528px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2010 (a)/font/tdtd colspan="3" style="width: 96px; bo rder-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:96px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Mark-to-Market Derivatives /font/td/trtr style="height: 15px"td colspan="2" style="width: 528px; text-align:left;border-color:#000000;min-width:528px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Balance as of December 31, 2009/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 59px; text-align:right;border-color:#000000;min-width:59px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"931/font/tdtd style="width: 25px; text-align:center;border-color:# 000000;min-width:25px;"#160;/td/trtr style="height: 15px"td colspan="2" style="width: 528px; text-align:left;border-color:#000000;min-width:528px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total realized / unrealized gains/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 59px; text-align:left;border-color:#000000;min-width:59px;"#160;/tdtd style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/td/trtr style="height: 15px"td style="width: 32px; text-align:left;border-color:#000000;min-width:32px;"#160;/tdtd style="width: 496px; text-align:left;border-color:#000000;min-width:496px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Included in net income/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 59px; text-align:right;border-color:#000000;min-width:59px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"79/font/tdtd style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"(b)/font/td/trtr style="height: 15px"td style="width: 32px; text-align:left;border-color:#000000;min-width:32px;"#160;/tdtd style="width: 496px; text-align:left;border-color:#000000;min-width:496px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Included in other comprehensive income/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 59px; text-align:right;border-color:#000000;min-width:59px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"286/font/tdtd style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"(c)/font/td/trtr style="height: 15px"td colspan="2" style="width: 528px; 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text-align:center;border-color:#000000;min-width:25px;"#160;/td/trtr style="height: 3px"td style="width: 32px; text-align:left;border-color:#000000;min-width:32px;"#160;/tdtd style="width: 496px; text-align:le ft;border-color:#000000;min-width:496px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 59px; text-align:center;border-color:#000000;min-width:59px;"#160;/tdtd style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/td/trtr style="height: 15px"td colspan="2" style="width: 528px; text-align:left;border-color:#000000;min-width:528px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Balance as of March 31, 2010/font/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 59px; border-bottom-style:double;border-bottom-width:3px;text-align:rig ht;border-color:#000000;min-width:59px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,279/font/tdtd style="width: 25px; 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text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"March 31, 2010/font/tdtd style="w idth: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(2)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"55/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style= "width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"26/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; 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text-align:left;border-color:#000000;min-width:30px;" amp;#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"held as of March 31, 2010/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="F ONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"54/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"font style="F ONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"20/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 45px; text-align:right;border-color:#000000;min-width:45px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color :#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/td/trt r style="height: 34px"td colspan="2" style="width: 397px; text-align:left;border-color:#000000;min-width:397px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2009/font/tdtd colspan="2" style="width: 57px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:57px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Operating Revenue /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 57px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:57px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Purchased Power /font /tdtd style="width: 5px; 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text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 5px; text-align:left;border-co lor:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"March 31, 2009/font/tdtd style="width: 12px; 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text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 45px; text-align:left;border-color:#000000;min-width:45px;"#160;/td/trtr style="height : 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 377px; text-align:left;border-color:#000000;min-width:377px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"held as of March 31, 2009/font/tdtd style="width: 12px; 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border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 44px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:44px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 44px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:44px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"25/font/tdtd style="width: 35px; text-align:left;border-co lor:#000000;min-width:35px;"#160;/td/trtr style="height: 4px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 347px; text-align:left;border-color:#000000;min-width:347px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 44px; text-align:center;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#00 0000;min-width:12px;"#160;/tdtd style="width: 44px; text-align:center;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 44px; text-align:center;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/td/trtr style="height: 17px"td colspan="2" style="width: 367px; 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text-align:center;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 44px; text-align:center;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 44px; text-align:center;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/td/tr ;tr style="height: 17px"td colspan="2" style="width: 367px; text-align:left;border-color:#000000;min-width:367px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total liabilities/font/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; 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text-align:center;border-color:#000000;min - -width:44px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 44px; text-align:center;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 44px; text-align:center;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 367px; text-align:left;border-color:#000000;min-width:367px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: # 000000;"Total net assets (liabilities)/font/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; 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text-align:left;border-color:#000000;min-width:542px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Balance as of December 31, 2009/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(971)/font/td/trtr style="height: 17px"td colspan="2" style="width: 542px; text-align:left;border-color:#000000;min-width:542px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total realized / unrealized losses included in regulatory assets(a)/font/tdtd style="width: 12px; border-bottom-style:solid; border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 75px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:75px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(264)/font/td/trtr style="height: 7px"td style="width: 24px; text-align:left;border-color:#000000;min-width:24px;"#160;/tdtd style="width: 518px; text-align:left;border-color:#000000;min-width:518px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 75px; text-align:center;border-color:#000000;min-width:75px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 542px; text-align:left;border-color:#000000;min-width:542px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Balance as of March 31, 2010/font/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 75px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:75px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(1,235)/font/td/tr/table/divp style='margin-top: 0pt; 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text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 34px; text-align:center;border-color:#000000;min-width:34px;"#160;/td/trtr style="height: 17px"td colspan="2" style="width: 368px; text-align:left;border-color:#000000;min-width:368px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total liabilities/font/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style= "FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(25)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(6)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FON T-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(31)/font/tdtd style="width: 34px; 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text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 34px; text-align:center;border-color:#000000;min-width:34px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 368px; text-align:left;border-color:#000000;min-width:368px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total net assets (liabilities)/font/td td style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"288/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;" t;font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(25)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(6)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 1 0pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"257/font/tdtd style="width: 34px; text-align:left;border-color:#000000;min-width:34px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:3pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(a)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"Excludes certain cash equivalents#160;considere d to be held-to-maturity /fontfont style="font-family:Times New Roman;font-size:7.5pt;"and not reported at fair value./fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"Includes restricted cash equivalents of VIE at March 31, 2010. 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margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis during the three months ended March 31, 2010 and 2009:/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 25px"td colspan="2" style="w idth: 349px; text-align:left;border-color:#000000;min-width:349px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2010/font/tdtd colspan="2" style="width: 97px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:97px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Mark-to-Market Derivatives/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 97px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:97px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Servicing Liability/font/tdtd style="width: 20px; text- align:left;border-color:#000000;min-width:20px;"#160;/tdtd colspan="2" style="width: 52px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:52px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Total/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/td/trtr style="height: 17px"td colspan="2" style="width: 349px; text-align:left;border-color:#000000;min-width:349px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Balance as of December 31, 2009/font/tdtd style="width: 12px; 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text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 329px; text-align:left;border-color:#000000;min-width:329px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Included in net income/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 85px; text-align:right;border-col or:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 85px; text-align:right;border-color:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2/font/tdtd colspan="2" style="width: 32px; text-align:left;border-color:#000000;min-width:32px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"(a)/font/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2/font/tdtd style="width: 5px; text-align:left;border-color:#000000 ;min-width:5px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 329px; text-align:left;border-color:#000000;min-width:329px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Included in regulatory assets/font/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 85px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"(7)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text- align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 85px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"0/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"(7)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/td/trtr style="height: 7px"td style="width: 20px; text-align:left;border-color:#00000 0;min-width:20px;"#160;/tdtd style="width: 329px; text-align:left;border-color:#000000;min-width:329px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 85px; text-align:center;border-color:#000000;min-width:85px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 85px; text-align:center;border-color:#000000;min-width:85px;"#160;/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdt d style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 349px; text-align:left;border-color:#000000;min-width:349px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Balance as of March 31, 2010/font/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 85px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(11)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; bord er-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 85px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(11)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:3pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(a) /fontfont style="font-family:Times New Roman;font-size:7.5pt;"The servicing liability related to PECO's accounts receivable agreement was /fontfont style="font-family:Times New Roman;font-size:7.5pt;"released in accordance with new guidance on accounting for transfers of financial assets that was adopted on January 1, 2010. See Note 5 #8211; Debt and Credit Agreements for additional information./f ont/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"There was no activity related to /fontfont style="font-family:Times New Roman;font-size:10pt;"mark-to-market derivatives/fontfont style="font-family:Times New Roman;font-size:10pt;" or the servicing liability/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"during the three months ended March 31, 2009./font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Valuation Techniques Used to Determine Fair Value /font/pp style='margin-top:0pt; marg in-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Th/fontfont style="font-family:Times New Roman;font-size:10pt;"e following describes the valuation techniques used to measure the fair value of the assets and liabilities shown in the tables above. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Cash Equivalents (Exelon, Generation, ComEd and PECO).#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"The Registrants' cash equivalents include investments with maturities of three months or less when purchased. The cash equivalents shown in the fair value table are comprised of investments in mutual and money market funds. The fair values of the sha res of these funds are based on observable market prices and, therefore, have been categorized in Level 1 in the fair value hierarchy. /font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:23.05px;"Nuclear Decommissioning Trust Fund Investments (Exelon and Generation).#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"The trust fund investments have been established to satisfy Exelon's and Generation's nuclear decommissioning obligations. The /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT/fontfont style="font-family:Times New Roman;font-size:10pt;" funds hold debt and equity securities directly and indirectly through commingled funds. Generation's investment policies place limitations on the types and investment grade r atings of the securities that may be held by the trusts. These policies restrict the trust funds from holding alternative investments and limit the trust funds' exposures to investments in highly illiquid markets./fontfont style="font-family:Times New Roman;font-size:10pt;" Investments with maturities of three months or less when purchased, including certain short-term fixed income securities, are considered cash equivalents and included in the recurring fair value measurements hierarchy as Level 1 or Level 2./font/pp style='margin-top:9.9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:23.1px;"With respect to individually held equity securities, the trustees obtain prices from pricing services, whose prices are obtained from direct feeds from market exchanges, which Generation is able to independently corroborate. /fontfont style="font-family:Times New Roman;font-size:10pt;"The fair values of equity secu rities held directly by the trust funds are based on quoted prices in active markets and are categorized in Level 1. Equity securities held individually are primarily traded on the New York Stock Exchange and NASDAQ-Global Select Market, which contain only actively traded securities due to the volume trading requirements imposed by these exchanges. /font/pp style='margin-top:9.9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:23.1px;"For fixed income securities, multiple prices from pricing services/fontfont style="font-family:Times New Roman;font-size:10pt;" are obtained from pricing vendors whenever possible, /fontfont style="font-family:Times New Roman;font-size:10pt;"which enable/fontfont style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;" cross-provider validations in addition to checks for unusual daily mov ements. A primary price source is identified based on asset type, class or issue for each security. The trustees monitor prices supplied by pricing services and may use a supplemental price source or change the primary price source of a given security if the portfolio managers challenge an assigned price and the trustees determine that another price source is considered to be preferable. Generation has obtained an understanding of how these prices are derived, including the nature and observability of the inputs used in deriving such prices. Additionally, Generation selectively corroborates the fair values of securities by comparison to other market-based price sources./fontfont style="font-family:Times New Roman;font-size:10pt;" U.S. Treasury securities are categorized as Level 1 because they trade in a highly liquid and transparent market. The fair values of fixed income securities, excluding U.S. Treasury securities, are based on evaluated prices that reflect observable market informatio n, such as actual trade information or similar securities, adjusted for observable differences and are categorized in Level 2./font/pp style='margin-top:9.9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:23.05px;"Commingled funds, which are similar to mutual funds, are maintained by investment companies and hold certain investments in accordance with a stated set of fund objectives. The fair values of short-term commingled funds held within the trust funds, which generally hold short-term fixed income securities and are not subject to restrictions regarding the purchase or sale of shares, are derived from observable prices. The objectives of the remaining commingled funds in which Exelon and Generation invest primarily seek to track the performance of certain equity indices/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"by purchasi ng equity securities to replicate the capitalization and characteristics of the indices. /fontfont style="font-family:Times New Roman;font-size:10pt;"In general, equity commingled funds are redeemable on the 15th of the month and the last business day of the month, however, the fund manager may designate any day as a valuation date for the purpose of purchasing or redeeming units. /fontfont style="font-family:Times New Roman;font-size:10pt;"Effective December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;", c/fontfont style="font-family:Times New Roman;font-size:10pt;"ommingled fund/fontfont style="font-family:Times New Roman;font-size:10pt;"s are categorized in Level 2/fontfont style="font-family:Times New Roman;font-size:10pt;" because the fair value of the funds are based on NAVs per fund share (the unit of account), primarily derived from the quoted prices in active markets on the underl ying equity securities. S/fontfont style="font-family:Times New Roman;font-size:10pt;"ee /fontfont style="font-family:Times New Roman;font-size:10pt;"Note /fontfont style="font-family:Times New Roman;font-size:10pt;"10/fontfont style="font-family:Times New Roman;font-size:10pt;" #8212; /fontfont style="font-family:Times New Roman;font-size:10pt;"Nuclear Decommissioning/fontfont style="font-family:Times New Roman;font-size:10pt;" for further discussion on the /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT/fontfont style="font-family:Times New Roman;font-size:10pt;" fund investments./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:ita lic;margin-left:24.5px;"Rabbi Trust Investments (Exelon, Generation, ComEd and PECO).#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"The Rabbi trusts were established to hold assets related to deferred compensation plans existing for certain active and retired members of Exelon's executive management and directors. The investments in the Rabbi trusts are included in investments in the Registrants' Consolidated Balance Sheets. The fair values of the shares of the funds are based on observable market prices and, therefore, have been categorized in Level 1 in the fair value hierarchy. /font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Mark-to-Market Derivatives (Exelon, Generation/fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;", ComEd a nd PECO/fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;")/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Derivative contracts are traded in both exchange-based and non-exchange-based markets. Exchange-based derivatives that are valued using unadjusted quoted prices in active markets are categorized in Level 1 in the fair value hierarchy. Certain non-exchange-based derivatives are valued using indicative price quotations availa/fontfont style="font-family:Times New Roman;font-size:10pt;"ble through brokers or over-the/fontfont style="font-family:Times New Roman;font-size:10pt;"-counter, on-line exchanges and are categorized in Level 2. These price quotations reflect the average of the bid-ask/fontfont style="font-family: Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" mid-point prices and are obtained from sources that the Registrants believe provide the most liquid market for the commodity. The price quotations are reviewed and corroborated to ensure the prices are observable and representative of an orderly transaction between market participants. This includes consideration of actual transaction volumes, market delivery points, bid-ask spreads and contract duration. The remainder of non-exchange-based derivative contracts /fontfont style="font-family:Times New Roman;font-size:10pt;"is/fontfont style="font-family:Times New Roman;font-size:10pt;" valued using the Black model, an industry standard option valuation model. The Black model takes into account inputs such as contract terms, including maturity, and market parameters, including assumptions of the future prices of energy, interest rates, volatility, credit worthiness and credit spread. For non-exchange-based derivatives that trade in liquid markets, such as generic forwards, swaps and options, model inputs are generally observable. Such instruments are categorized in Level 2. The Registrants' non-exchange-based derivatives are predominately at liquid trading points. For non-exchange-based derivatives that trade in less liquid markets with limited pricing information, such as the financial swap contract between Generation and ComEd, model inputs generally would include both observable and unobservable inputs. These valuations may include an estimated basis adjustment from an illiquid trading point to a liquid trading point for which active price quotations are available. For valuations that include both observable and unobservable inputs, if the /fontfont style="font-family:Times New Roman;font-size:10pt;"unobservable input is determined to be significant to the overall inputs, the entire valuation is categorized in Level 3. /fontfont style= "font-family:Times New Roman;font-size:10pt;"This includes derivatives valued using indicative price quotations whose contract tenure extends into unobservable periods. /fontfont style="font-family:Times New Roman;font-size:10pt;"In/fontfont style="font-family:Times New Roman;font-size:10pt;" instances where observable data is unavailable, consideration is given to the assumptions that market participants would use in valuing the asset or liability. This includes assumptions about market risks such as liquidity, volatility and contract duration. Such instruments are categorized in Level 3 as the model inputs generally are not observable. The Registrants consider credit and nonperformance risk in the valuation of derivative contracts categorized in Level 1, 2 and 3, including both historical and current market data in its assessment of credit and nonperformance risk/fontfont style="font-family:Times New Roman;font-size:10pt;" by counterparty/font ;font style="font-family:Times New Roman;font-size:10pt;". The impacts of credit and nonperformance risk were not material to the financial statements./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Transfers in and out of levels are recognized as of the beginning of the month the transfer occurred. Given derivatives categorized within Level 1 are value/fontfont style="font-family:Times New Roman;font-size:10pt;"d/fontfont style="font-family:Times New Roman;font-size:10pt;" using exchange/fontfont style="font-family:Times New Roman;font-size:10pt;"-based quoted prices within observable periods, transfers between level 2 and level 1 generally do not occur. Transfers in and out of level 2 and level 3 generally occur when the contract tenure becomes more observable/fontfont style="font-family:Times New Roman;font-size:10pt;"./font ;/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Exelon may utilize fixed-to-floating interest/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"rate swaps, which are typically designated as fair/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"value hedges, as a means to achieve its targeted level of variable-rate debt as a percent of total debt. /fontfont style="font-family:Times New Roman;font-size:10pt;"In addition, the Registrants may utilize interest rate derivatives to lock in interest rate levels in anticipation of future financings, which a/fontfont style="font-family:Times New Roman;font-size:10pt;" ;re typically designated as cash /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges. /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon uses a calculation of future cash inflows and estimated future outflows related to the swap agreements, which are discounted and netted to determine the current fair value. Additional inputs to the present value calculation include the contract terms, counterparty credit risk and market parameters such as interest rates and volatility. As these inputs are based on observable data and valuations of similar instruments, the interest/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"rate swaps are categorized in Level 2 in the fair value hierarchy. See Note /fontfont style="font-family:Times New Roman;font-size:10pt;"6/fontfont style="font-family:Times New Roman;font-size:10pt; "#8212;Derivative Financial Instruments for further discussion on mark-to-market derivatives. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Deferred Compensation Obligations (Exelon, Generation, ComEd and PECO).#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"The Registrants' deferred compensation plans allow participants to defer certain cash compensation into a notional investment account. The Registrants include such plans in other current and noncurrent liabilities in their Consolidated Balance Sheets. The value of the Registrants' deferred compensation obligations is based on the market value of the participants' notional investment accounts. The notional investments are comprised primarily of mut ual funds, which are based on observable market prices. However, since the deferred compensation obligations themselves are not exchanged in an active market, they are categorized in Level 2 in the fair value hierarchy. /font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:36px;"Servicing Liability (Exelon and PECO).#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"PECO is party to an agreement with a financial institution under which it transferred an undivided interest, adjusted daily, in customer accounts receivables designated under the agreement in exchange for proceeds of $225 million, which PECO accounted for as a sale under previous guidance on accounting for transfers of financial assets. /fontfont style="font-family:Times New Roman;font-size:10pt;"A servicing liability wa s recorded for the agreement in accordance with /fontfont style="font-family:Times New Roman;font-size:10pt;"the /fontfont style="font-family:Times New Roman;font-size:10pt;"applicable /fontfont style="font-family:Times New Roman;font-size:10pt;"authoritative guidance for servic/fontfont style="font-family:Times New Roman;font-size:10pt;"ing of financial assets/fontfont style="font-family:Times New Roman;font-size:10pt;". The servicing liability /fontfont style="font-family:Times New Roman;font-size:10pt;"was /fontfont style="font-family:Times New Roman;font-size:10pt;"included in other current liabilities in Exelon's and PECO's Consolidated Balance Sheets. The fair value of the liability /fontfont style="font-family:Times New Roman;font-size:10pt;"was/fontfont style="font-family:Times New Roman;font-size:10pt;" determined using internal estimates based on provisions in the agreement, which /fontfont style="font-family:Times New Roman;font-size:10pt;"wer/fontfont style="font-family:Times New Roman;font-size:10pt;"e /fontfont style="font-family:Times New Roman;font-size:10pt;"categorized as Level 3 inpu/fontfont style="font-family:Times New Roman;font-size:10pt;"ts in the fair value hierarchy. T/fontfont style="font-family:Times New Roman;font-size:10pt;"he servicing liability was released /fontfont style="font-family:Times New Roman;font-size:10pt;"in accordance with/fontfont style="font-family:Times New Roman;font-size:10pt;" new guidance on accounting for transfers of financial assets /fontfont style="font-family:Times New Roman;font-size:10pt;"that was adopted /fontfont style="font-family:Times New Roman;font-size:10pt;"on January 1, 2010. See Note 5 #8211; Debt and Credit Agreements for additional information./fon t/p

Debt and Credit Agreements	3 Months Ended
Debt and Credit Agreements	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Debt and Credit Agreements (Exelon, Generation, ComEd and PECO)	p style='margin-top:16.85pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"5.#160;#160;#160;#160;Debt and Credit Agreements (Exelon, Generation, ComEd and PECO) /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Short-Term Borrowings /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"Exelon meets its short-term liquidity requirements primarily through the issuance of commercial paper, Generation and PECO meet their short-term liquidity requirements primarily through the issuance of commercial paper and borrowings from the intercompany money pool and ComEd meets its short-term l iquidity requirements primarily /fontfont style="font-family:Times New Roman;font-size:10pt;"through /fontfont style="font-family:Times New Roman;font-size:10pt;"the issuance of commercial paper and/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"borrowings under its credit facility. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"As of March 31, 2010, Exelon Corporate, Generation/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"a/fontfont style="font-family:Times New Roman;font-size:10pt;"nd PECO had access to unsecured revolving credit facilities with aggregate bank commitments of $957 million, $4.8 billion and $574 million, respectively. /fontfont style="font-family:Times New Roman;font-size:10pt;"On March 25, 2010, ComEd /fontfont style="font-family:Times New Roman;font-size:10pt;"replaced /fontfont style="font-family:Times New Roman;font-size:10pt;"its $952 million credit facility /fontfont style="font-family:Times New Roman;font-size:10pt;"with/fontfont style="font-family:Times New Roman;font-size:10pt;" a /fontfont style="font-family:Times New Roman;font-size:10pt;"new/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"$1 billion /fontfont style="font-family:Times New Roman;font-size:10pt;"unsecured /fontfont style="font-family:Times New Roman;font-size:10pt;"revolving credit facility/fontfont style="font-family:Times New Roman;font-size :10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"that extends to/fontfont style="font-family:Times New Roman;font-size:10pt;" March 25, 2013/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"Borrowings under that credit facility bear interest at a rate that floats daily based upon a prime rate or at a rate fixed for a specified interest period based upon a LIBOR-based rate. Adders of up to 137.5 basis points /fontfont style="font-family:Times New Roman;font-size:10pt;"for prime-based borrowings /fontfont style="font-family:Times New Roman;font-size:10pt;"and 237.5 basis points /fontfont style="font-family:Times New Roman;font-size:10pt;"for/fontfont style="font-family:Times New Roman;font-size:10pt;" LIBOR-based /fontfont style="font-family:Times New Roman;font-size:10pt;" gt;borrowings are added /fontfont style="font-family:Times New Roman;font-size:10pt;"based upon ComEd's credit rating. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"Generation /fontfont style="font-family:Times New Roman;font-size:10pt;"also had/fontfont style="font-family:Times New Roman;font-size:10pt;" additional letter of credit facilities used solely to enhance tax-exempt variable rate debt as discussed further below./fontfont style="font-family:Times New Roman;font-size:10pt;" See Note#160;9 of/fontfont style="font-family:Times New Roman;font-size:10pt;" the/fontfont style="font-family:Times New Roman;font-size:10pt;" 2009 Form#160;10-K for further information regarding the credit facilities. /fontfont style ="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:11.2pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"Additionally, Generation, ComEd and PECO had $7 million, $30 million and $30 million, respectively, of additional credit facility agreements with minority and community banks located primarily within /fontfont style="font-family:Times New Roman;font-size:10pt;"ComEd's and PECO's/fontfont style="font-family:Times New Roman;font-size:10pt;" service territories, which expire on October 23, 2010. These facilities are /fontfont style="font-family:Times New Roman;font-size:10pt;"solely/fontfont style="font-family:Times New Roman;font-size:10pt;" utilized /fontfont style="font-family:Times New Roman;font-size:10pt;"by Generation, ComEd and PECO /fontfont style="font-family:Times New Roman;font-size:10pt;"to issue letters of credit. As of March 31, 2010, Generation, ComEd and PECO had issued letters of credit under these agreements totaling $5 million, $24 million and $29 million, respectively. /font/pp style='margin-top:11.2pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"Exelon, /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation, /fontfont style="font-family:Times New Roman;font-size:10pt;"ComEd and PECO had the following amounts of commercial paper and credit facility borrowings outstanding at March 31, 2010 and December 31, 2009:/fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:5.6pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 34px"td style="wi dth: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 441px; text-align:left;border-color:#000000;min-width:441px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Commercial paper borrowings/font/tdtd colspan="2" style="width: 63px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:63px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"March 31, 2010/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 64px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:64px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: c enter;"December 31, 2009/font/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 441px; text-align:left;border-color:#000000;min-width:441px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Exelon Corporate/font/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 50px; 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text-align:left;border-colo r:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"0/font/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 441px; text-align:left;border-color:#000000;min-width:441px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"ComEd/font/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"256/font ;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"0/font/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 441px; text-align:left;border-color:#000000;min-width:441px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"PECO /font/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FO NT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"0/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"0/font/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 441px; text-align:left;border-color:#000000;min-width:441px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Credit facility borrowings/font/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/td t;td style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 441px; text-align:left;border-color:#000000;min-width:441px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"ComEd/font/tdtd style="width: 13px; 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margin-bottom :0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"#160;#160;#160;#160;#160;#160;#160;During the /fontfont style="font-family:Times New Roman;font-size:10pt;"three /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended March 31, 2010, /fontfont style="font-family:Times New Roman;font-size:10pt;"the/fontfont style="font-family:Times New Roman;font-size:10pt;"re were no issuances of /fontfont style="font-family:Times New Roman;font-size:10pt;"long-term debt./font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"During the three months ended March 31, 2009, the following long-term debt was issued:/font /pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 60px; 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margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"____________________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(a) Excludes unamortized bond discounts./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:18px;"Retirement of Long-Term Debt/font/pp style='margin-top:0pt; margin-bottom:0 pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"#160;#160;#160;#160;#160;#160;#160;During the three /fontfont style="font-family:Times New Roman;font-size:10pt;"months /fontfont style="font-family:Times New Roman;font-size:10pt;"ended March 31, 2010, /fontfont style="font-family:Times New Roman;font-size:10pt;"the following long-term debt was retired/font/pp style='margin-top: 0pt; 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margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"#160;#160;#160;#160;# 160;#160;#160;During the three /fontfont style="font-family:Times New Roman;font-size:10pt;"months /fontfont style="font-family:Times New Roman;font-size:10pt;"ended March 31, 2009, the following long-term debt was retired:/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 14px"td style="width: 69px; text-align:left;border-color:#000000;min-width:69px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Company /font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: under line;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;"Type /font/tdtd style="width: 75px; text-align:center;border-color:#000000;min-width:75px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"Interest Rate /font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 109px; text-align:center;border-color:#000000;min-width:109px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"Maturity /font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 68px; text-align:center;border-color:#000000;min-width:68px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underl ine;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"Amount/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/td/trtr style="height: 17px"td style="width: 69px; text-align:left;border-color:#000000;min-width:69px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Generation/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Pollution Control Notes/font/tdtd style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"Variable/font /tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 109px; text-align:right;border-color:#000000;min-width:109px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"December 1, 2042/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 58px; text-align:right;border-color:#000000;min-width:58px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 46/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/td/trtr style="height: 17px"td style="width: 69px; text-align:left;border-co lor:#000000;min-width:69px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Generation/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Kennett Square Capital Lease/font/tdtd style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"7.83%/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 109px; text-align:right;border-color:#000000;min-width:109px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"September 20, 2020/font/td t;td style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 58px; text-align:right;border-color:#000000;min-width:58px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 1/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/td/trtr style="height: 17px"td style="width: 69px; text-align:left;border-color:#000000;min-width:69px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"ComEd/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR : #000000;TEXT-ALIGN: left;"First Mortgage Bonds/font/tdtd style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5.70%/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 109px; text-align:right;border-color:#000000;min-width:109px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"January 15, 2009/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 58px; text-align:right;border-color:#000000;min-width:58px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 16/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/td/trtr style="height: 17px"td style="width: 69px; text-align:left;border-color:#000000;min-width:69px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"ComEd/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Sinking fund debentures/font/tdtd style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"4.625%/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 109px; te xt-align:right;border-color:#000000;min-width:109px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"January 1, 2009/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 58px; text-align:right;border-color:#000000;min-width:58px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 1/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/td/trtr style="height: 17px"td style="width: 69px; text-align:left;border-color:#000000;min-width:69px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"PECO/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;" gt;#160;/tdtd style="width: 272px; text-align:left;border-color:#000000;min-width:272px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"PETT Transition Bonds/font/tdtd style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"7.65%/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 109px; text-align:right;border-color:#000000;min-width:109px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"September 1, 2009/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 58px; text-align:rig ht;border-color:#000000;min-width:58px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 169/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Variable Rate Debt/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Under the terms of Generation's and ComEd's variable-rate tax-exempt debt agreements, Generation or ComEd may be required to repurchase any outstanding debt before its stated maturity unless supported by sufficient letters of credit. If either Generation or ComEd w ere required to repurchase the debt, it would reassess its options to obtain new letters of credit or remarket the bonds in a manner that does not require letter of credit support. Generation and ComEd have classified amounts outstanding under the/fontfont style="font-family:Times New Roman;font-size:10pt;"se debt agreements /fontfont style="font-family:Times New Roman;font-size:10pt;"based on management's intent and ability to renew or replace the letters of credit, refinance the debt at reasonable terms on a long-term fixed-rate basis or utilize the capacity under existing long-term credit facilities./font/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Generation has letter of credit facilities that will/fontfont style="font-family:Times New Roman;font-size:10pt;" expire in June/fontfont style="font-family:Times New Roman;font-size:10pt;" 2 010, which are used to /fontfont style="font-family:Times New Roman;font-size:10pt;"enhance the /fontfont style="font-family:Times New Roman;font-size:10pt;"credit /fontfont style="font-family:Times New Roman;font-size:10pt;"of/fontfont style="font-family:Times New Roman;font-size:10pt;" variable-rate long-term tax-exempt debt totaling $212 million, with maturities r/fontfont style="font-family:Times New Roman;font-size:10pt;"anging from 2016 #8211; 2034. /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation /fontfont style="font-family:Times New Roman;font-size:10pt;"is currently assessing its options/fontfont style="font-family:Times New Roman;font-size:10pt;" to extend or replace the expiring letters of credit with new letters of credit at reasonable terms, or remarket the bonds with an interest rate term not req/fontfont style="font-family:Tim es New Roman;font-size:10pt;"uiring letter of credit support./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation /fontfont style="font-family:Times New Roman;font-size:10pt;"is also considering repurchasing the bonds upon expiration of the letters of credit in June 2010./fontfont style="font-family:Times New Roman;font-size:10pt;" As a result, Generation has classified $212 million of variable-rate long-term tax-exempt debt as long-term debt due within one year within Exelon and Generation's Consolidated Balan/fontfont style="font-family:Times New Roman;font-size:10pt;"ce Sheets as of March 31, 2010./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='m argin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:12.25px;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;"Accounts Receivable /fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;"Agreement/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"PECO is party to an agreement with a financial institution under which it transferred an undivided interest, adjusted daily, in i/fontfont style="font-family:Times New Roman;font-size:10pt;"ts customer accounts receivable/fontfont style="font-family:Times New Roman;font-size:10pt;" designated under the agreement in exchange for proceeds of $225 million, which /fontfont style="font-family:T imes New Roman;font-size:10pt;"Exelon and /fontfont style="font-family:Times New Roman;font-size:10pt;"PECO accounted for as a sale under previous guidance on accounting for tran/fontfont style="font-family:Times New Roman;font-size:10pt;"sfers of financial assets. The accounting/fontfont style="font-family:Times New Roman;font-size:10pt;" guidance has been amended, effective for the Registrants on January 1, 2010, and requires that this transaction be accounted for as a secured borrowing/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"as the transferred interest does not meet the criteria of a participating interest as defined under the authoritative guidance/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"Therefore, o/fontfont styl e="font-family:Times New Roman;font-size:10pt;"n January 1, 2010, the proceeds of $225 million representing the transferred interest in customer accounts receivable /fontfont style="font-family:Times New Roman;font-size:10pt;"previously/fontfont style="font-family:Times New Roman;font-size:10pt;" recorded as a contra-receivable /fontfont style="font-family:Times New Roman;font-size:10pt;"was/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"reclassified to a short-term note payable on /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon's and /fontfont style="font-family:Times New Roman;font-size:10pt;"PECO's Consolidated Balance Sheets in accordance with the amended /fontfont style="font-family:Times New Roman;font-size:10pt;"accounting /fontfont style="font-family:Times New Roman ;font-size:10pt;"guidance. Additionally, the servicing liability of $2 million recorded under the prior guidance has been released. As of March 31, 2010, the /fontfont style="font-family:Times New Roman;font-size:10pt;"financial institution's /fontfont style="font-family:Times New Roman;font-size:10pt;"undivided interest in /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon's and /fontfont style="font-family:Times New Roman;font-size:10pt;"PECO's customer accounts receivable was equivalent to $402 million/fontfont style="font-family:Times New Roman;font-size:10pt;", which is calculated under the terms of the agreement/fontfont style="font-family:Times New Roman;font-size:10pt;". Upon termination or liquidation of this agreement, the financial institution will be entitled to recover up to $225 million plus the accrued yield payable from the pool of receivables pledged. This agreement termin ates on September 16, 2010 unless extended in accordance with its terms. As of March 31, 2010, PECO was in compliance with the requirements of the agreement. In the event the agreement is not extended, PECO has sufficient short-term liquidity and /fontfont style="font-family:Times New Roman;font-size:10pt;"may/fontfont style="font-family:Times New Roman;font-size:10pt;" seek alternate financing. /font/p

Derivative Financial Instruments	3 Months Ended
Derivative Financial Instruments	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Derivative Financial Instruments (Exelon, Generation, ComEd and PECO)	p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"6/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;". /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Derivative Financial Instruments (Exelon, Generation, ComEd and PECO) /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The Registrants are exposed to certain risks related to ongoing business operations. The primary risks managed by using derivative instruments are commodity price risk and interest rate risk. To the extent the amount of energy Exelon generates differs fr om the amount of energy it has contracted to sell, the Registrants are exposed to market fluctuations in the prices of electricity, /fontfont style="font-family:Times New Roman;font-size:10pt;"fossil fuels/fontfont style="font-family:Times New Roman;font-size:10pt;" and other commodities. The Registrants employ established policies and procedures to manage their risks associated with market fluctuations by entering into physical contracts as well as/fontfont style="font-family:Times New Roman;font-size:10pt;" financial derivative contracts/fontfont style="font-family:Times New Roman;font-size:10pt;" including swaps, futures, forwards, options and short-term and long-term commitments to purchase and sell energy and energy-related products. The Registrants believe these instruments, which are classified as either economic hedges or non-derivatives, mitigate exposure to fluctuations in commodity prices. Exposure to interest rate risk exists as a re sult of the issuance of variable and fixed-rate debt, commercial paper and lines of credit. /font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Derivative accounting guidance/fontfont style="font-family:Times New Roman;font-size:10pt;" requires that derivative instruments be recognized as either assets or liabilities at fair value. Under the/fontfont style="font-family:Times New Roman;font-size:10pt;"se/fontfont style="font-family:Times New Roman;font-size:10pt;" provisions/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" economic hedges are recognized on the balance sheet at their fair value unless they qualify for the normal purchases and normal sales exception. The Registrants have applied the normal purchases and normal sales scope exception to certa in derivative contracts for the forward sale of generation, power procurement agreements, and natural gas supply agreements. /fontfont style="font-family:Times New Roman;font-size:10pt;"F/fontfont style="font-family:Times New Roman;font-size:10pt;"or economic hedges that qua/fontfont style="font-family:Times New Roman;font-size:10pt;"lify and are designated as cash /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges, the portion of the derivative gain or loss that is effective in offsetting the change in value of the underlying exposure is deferred in accumulated OCI and later reclassified into earnings when the underlying transaction occurs. For economic hedges that do not qualif/fontfont style="font-family:Times New Roman;font-size:10pt;"y or are not designated as cash /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges, changes in the fair value of the derivative are re cognized in earnings each period and are classified as other derivatives in the following tables. Non-derivative contracts for access to additional generation and for sales to load-serving entities are accounted for primarily under the accrual method of accounting, which is further discussed in Note#160;18 of the 200/fontfont style="font-family:Times New Roman;font-size:10pt;"9/fontfont style="font-family:Times New Roman;font-size:10pt;" Form 10-K. Additionally, Generation is exposed to certain market risks through its proprietary trading activities. The proprietary /fontfont style="font-family:Times New Roman;font-size:10pt;"trading /fontfont style="font-family:Times New Roman;font-size:10pt;"activities are a complement to Generation's energy marketing portfolio but represent a small portion of Generation's overall energy marketing activities. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/p ;p style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.25px;"Commodity Price Risk (Exelon, Generation, ComEd and PECO) /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Economic Hedging.#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"The Registrants are exposed to commodity price risk primarily relating to changes in the market price of electricity, fossil fuels, and other commodities associated with price movements resulting from changes in supply and demand, fuel costs, market liquidity, weather conditions, governmental regulatory and environmental policies, and other factors. Within Exelon, Generation has the most exposure to commodity price ris k. Generation uses a variety of derivative and non-derivative instruments to manage the commodity price risk of its electric generation facilities, including power sales, fuel and energy purchases, and other energy-related products marketed and purchased. In order to manage these risks, Generation may enter into fixed-price derivative or non-derivative contracts to hedge the variability in future cash flows from forecasted sales of energy and purchases of fuel and energy. The objectives for entering into such hedges include fixing the price for a portion of anticipated future electricity sales at a level that provides an acceptable return on electric generation operations, fixing the price of a portion of anticipated fuel purchases for the operation of power plants, and fixing the price for a portion of anticipated energy purchases to supply load-serving customers. The portion of forecasted transactions hedged may vary based upon management's policies and hedging objectives, the market, weather conditions, o perational and other factors. Generation is also exposed to differences between the locational settlement prices of certain economic hedges and the hedged generating units. This price difference is actively managed through other instruments which include financial transmission rights, whose changes in fair value are recognized in earnings each period, and auction revenue rights./font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In general, increases and decreases in forward market prices have a positive and negative impact, respectively, on Generation's owned and contracted generation positions which have not been hedged. Generation hedges commodity risk on a ratable basis over /fontfont style="font-family:Times New Roman;font-size:10pt;"three-year periods/fontfont style="font-family:Times New Roman;font-size:10pt;". As of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", the percentage of expected generation hedged /fontfont style="font-family:Times New Roman;font-size:10pt;"was /fontfont style="font-family:Times New Roman;font-size:10pt;"95%-98%/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"79%-82%/fontfont style="font-family:Times New Roman;font-size:10pt;", and /fontfont style="font-family:Times New Roman;font-size:10pt;"48%-51%/fontfont style="font-family:Times New Roman;font-size:10pt;" for/fontfont style="font-family:Times New Roman;font-size:10pt;" the remainder of/fontfont style="font-family:Times New Roman;font-size:10pt;" 2010, 2011 and 2012, respectively. The percentage of expected generation hedged is the amount of equivalent sa les divided/fontfont style="font-family:Times New Roman;font-size:10pt;" by the expected generation. Expected generation represents the amount of energy estimated to be generated or purchased through owned or contracted capacity. Equivalent sales represent all hedging products, which include cash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges, other derivatives and certain non-derivative contracts including sales to ComEd and PECO to serve their retail load./font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"ComEd has locked in a fixed price for a significant portion of its commodity price risk through the five-year financial swap contract with Generation that expires on May#160;31, 2013, which is discussed in more detail below. In addition, the contracts that Generat ion has entered into with ComEd and that ComEd has entered into with Generation and other suppliers as part of the ComEd power procurement agreements, which/fontfont style="font-family:Times New Roman;font-size:10pt;" are further discussed in Note 2 of the 2009 Form 10-K/fontfont style="font-family:Times New Roman;font-size:10pt;", qualify for the normal purchases and normal sales scope exception. Based on the Illinois Settlement Legislation and ICC-approved procurement methodologies permitting ComEd to recover its electricity procurement costs from retail customers with no mark-up, ComEd's price risk related to power procurement is limited. /font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"#160;In order to fulfill a requirement of the Illinois Settlement/fontfont style="font-family:Times New Roman;font-size:10pt;" Legislation/fontfont sty le="font-family:Times New Roman;font-size:10pt;", Generation and ComEd entered into a five-year financial swap contract effective August#160;28, 2007. The financial swap is designed to hedge spot market purchases, which along with ComEd's remaining energy procurement contracts, meet its load service requirements. The remaining swap contract volumes /fontfont style="font-family:Times New Roman;font-size:10pt;"are 2,000 MW for the period extending/fontfont style="font-family:Times New Roman;font-size:10pt;" through/fontfont style="font-family:Times New Roman;font-size:10pt;" May 2010 and 3,000 MW from June 2010 through May 2013. The terms of the financial swap contract require Generation to pay the /fontfont style="font-family:Times New Roman;font-size:10pt;"around the clock /fontfont style="font-family:Times New Roman;font-size:10pt;"market price for a portion of ComEd's electricity supply requirement, while ComEd pays a fixed price. The contract is to be settled net, for the difference between/fontfont style="font-family:Times New Roman;font-size:10pt;" the fixed and market pricing, and the financial terms only cover energy costs and do not cover capacity or ancillary services. The financial swap contract is a derivative financial instrument that has been designated by Generation as a cash flow hedge. Consequently, Generation records the fair value of the swap on its balance sheet and records changes in fair value to OCI. ComEd has not elected hedge accounting for this derivative financial instrument and records the fair value of the swap on its balance sheet. However, since the financial swap contract was deemed prudent by the Illinois Settlement Legislation, ComEd receives full cost recovery for the contract in rates and the change in fair value each period is recorded by ComEd as a regulator/fontfont style="font-family:Times New Roman;font-size:10pt;"y asset or liability. See Note /fon tfont style="font-family:Times New Roman;font-size:10pt;"2 of the 2009 Form 10-K/fontfont style="font-family:Times New Roman;font-size:10pt;" for additional information regarding the Illinois Settlement/fontfont style="font-family:Times New Roman;font-size:10pt;" Legislation/fontfont style="font-family:Times New Roman;font-size:10pt;". In Exelon's consolidated financial statements, all financial statement effects of the financial swap recorded by Generation and ComEd are eliminated. /font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"#160;PECO has transferred substantially all of its commodity price risk related to its procurement of electric supply to Generation through a PPA that expires December#160;31, 2010. The PPA is not considered a derivative under current derivative authoritative guidance. #160;As part of the preparation f or the expiration of the PPA, PECO has entered into contracts to procure electric supply through a competitive RFP process as outlined in its PAPUC-approved DSP Program, whic/fontfont style="font-family:Times New Roman;font-size:10pt;"h is further discussed in Note 3/fontfont style="font-family:Times New Roman;font-size:10pt;"#8212;Regulatory /fontfont style="font-family:Times New Roman;font-size:10pt;"Matters/fontfont style="font-family:Times New Roman;font-size:10pt;". Based on /fontfont style="font-family:Times New Roman;font-size:10pt;"Pennsylvania/fontfont style="font-family:Times New Roman;font-size:10pt;" legislation and the DSP Program permitting PECO to recover its electric supply procurement costs from retail customers with no mark-up, PECO's price risk related to electric supply procurement will be limited. PECO will lock in fixed prices for a significant portion of its commodity price risk followi ng the expiration of the electric generation rate caps through full requirements contracts and block contracts. PECO's full requirements fixed price contracts qualify for the normal purchases and normal sales scope exception. PECO accounts for the block contracts as other derivatives, which are recorded on its balance sheet at fair value and the change in fair value each period is recorded as a regulatory asset or liability. /font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"#160;PECO's natural gas procurement policy is designed to achieve a reasonable balance of long-term and short-term gas purchases under different pricing approaches in order to achieve system supply reliability at the least cost. PECO's reliability strategy is two-fold. First, PECO must assure that there is sufficient transportation capacity to satisfy deliverability requirements. Second, PECO must ensure that a firm source of su pply exists to utilize the capacity resources. All of PECO's natural gas supply and management agreements that are derivatives qualify for the normal purchases and normal sales exception. Additiona/fontfont style="font-family:Times New Roman;font-size:10pt;"lly, in accordance with the 20/fontfont style="font-family:Times New Roman;font-size:10pt;"09/fontfont style="font-family:Times New Roman;font-size:10pt;" PAPUC PGC settlement and to reduce the exposure of PECO and its customers to natural gas price volatility, PECO has continued its program to purchase natural gas for both winter and summer supplies using a layered approach of locking-in prices ahead of each season with long-term gas purchase agreements (those with primary terms of at least twelve months). Under the terms of the 2009 PGC settlement, PECO is required to lock in (i.e./fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times Ne w Roman;font-size:10pt;" economically hedge) the price of a minimum volume of its long-term gas commodity purchases. PECO's gas-hedging program covers /fontfont style="font-family:Times New Roman;font-size:10pt;"22% to 29%/fontfont style="font-family:Times New Roman;font-size:10pt;" of planned natural gas purchases in support of projected firm sales. The hedging program for natural gas procurement has no direct impact on PECO's financial position or results of operations as natural gas costs are fully recovered from customers under the PGC. /font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Proprietary Trading.#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Generation also enters into certain energy-related derivatives for proprietary trading purposes. Proprietary trading includes al l contracts entered into purely to profit from market price changes as opposed to hedging an exposure and is subject to limits established by Exelon's RMC. The proprietary trading activities, which included volumes /fontfont style="font-family:Times New Roman;font-size:10pt;"of /fontfont style="font-family:Times New Roman;font-size:10pt;"920/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"GWhs/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"and /fontfont style="font-family:Times New Roman;font-size:10pt;"2,331/fontfont style="font-family:Times New Roman;font-size:10pt;" GWhs for the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" t; /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;", respectively, are a complement to Generation's energy marketing portfolio but represent a small portion of Generation's revenue from energy marketing activities. Neither ComEd nor PECO enter into derivatives for proprietary trading purposes. /font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Interest Rate Risk (Exelon, Generation and ComEd) /font/pp style='margin-top:0 pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The Registrants use a combination of fixed-rate and variable-rate debt to manage interest rate exposure. The Registrants may also utilize fixed-to-floating interest rate swaps, which are typically designated as fair value hedges, as a means to manage their interest rate exposure. In addition, the Registrants may utilize interest rate derivatives to lock in interest rate levels in anticipation of future financings, which a/fontfont style="font-family:Times New Roman;font-size:10pt;"re typically designated as cash /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges. These strategies are employed to achieve a lower cost of capital. A hypothetical 10% increase in the interest rates associat ed with variable-rate debt would result /fontfont style="font-family:Times New Roman;font-size:10pt;"in less than a $1 million decrease/fontfont style="font-family:Times New Roman;font-size:10pt;" in /fontfont style="font-family:Times New Roman;font-size:10pt;"each of /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon, Generation, and ComEd's pre-ta/fontfont style="font-family:Times New Roman;font-size:10pt;"x income for the three/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;" #160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Fair Value Hedges/fontfont style="font-family:Times New Roman;font-size:10pt;".#160;For derivative instruments that/fontfont style="font-family:Times New Roman;font-size:10pt;" are designated and qualify as/fontfont style="font-family:Times New Roman;font-size:10pt;" fair value hedge/fontfont style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;", the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current earnings. /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon/fontfont style="font-family:Times New Roman;font-size:10pt;" include/font lt;font style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;" the gain or loss on the hedged items and the offsetting loss or gain on the related interest rate swaps in interest expense as follows/fontfont style="font-family:Times New Roman;font-size:10pt;" for the three /fontfont style="font-family:Times New Roman;font-size:10pt;"months /fontfont style="font-family:Times New Roman;font-size:10pt;"ended/fontfont style="font-family:Times New Roman;font-size:10pt;" March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;":/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 232px; text-align:left;border-color:#000000;min-width:232px;"#160;/tdtd style="wi dth: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 116px; text-align:left;border-color:#000000;min-width:116px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 161px; text-align:left;border-color:#000000;min-width:161px;"#160;/td/trtr style="height: 17px"td style="width: 232px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:232px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"Income Statement Classification/font/tdtd style="width: 50px; text-align:left; border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 116px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:116px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;"Gain on Swaps/font/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 161px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:161px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: cente r;"Loss on Borrowings/font/td/trtr style="height: 17px"td style="width: 232px; text-align:center;border-color:#000000;min-width:232px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"Interest expense/font/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 116px; text-align:center;border-color:#000000;min-width:116px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"2/font/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"font style="FONT-FAMILY: Arial;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 161px; text-align:center;border-color:#000000;min-width:161px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"(2)/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"At March 31, 2010 and December 31, 2009, Exelon had /fontfont style="font-family:Times New Roman;font-size:10pt;"$100/fontfont style="font-family:Times New Roman;font-size:10pt;" million of notional amounts of fair value hedges outstanding related to interest rate swaps, with fair value assets of /fontfont style="font-family:Times New Roman;font-size:10pt;"$12/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" and $1/fontfont style="font-family:Times New Roman;font-size:10pt;"0/fontfont style="font-family:Times New Roman;font-size:10pt;" million, respectively. During the three/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended March 31, 2010 and 2009, there was no impact on the results of operations as a result of ineffectiveness from fair value hedges. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:13.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Fair Value Measurement (Exelon, Generation/fontfont style="font-family:Times New Roman;font-s ize:10pt;font-weight:bold;font-style:italic;", ComEd/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" and PECO/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;") /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"F/fontfont style="font-family:Times New Roman;font-size:10pt;"air value /fontfont style="font-family:Times New Roman;font-size:10pt;"accounting guidance requires the fair value /fontfont style="font-family:Times New Roman;font-size:10pt;"of derivative instruments to be shown in the Notes to the Consolidated Financial Statements on a gross basis, even when the derivative instruments are subject to master netting agreements and qualify for net presentation in the /fontfont style="font-family:Times New Roman;fo nt-size:10pt;"Consolidated Balance Sheet/fontfont style="font-family:Times New Roman;font-size:10pt;". In the table below, Generation's cash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges, other derivatives and proprietary trading derivatives are shown gross and the impact of the netting of fair value balances with the same counterparty, as well as netting of collateral, is aggregated in the collateral and netting column. Excluded from the tables below are economic hedges that /fontfont style="font-family:Times New Roman;font-size:10pt;"qualify for the/fontfont style="font-family:Times New Roman;font-size:10pt;" normal purchase/fontfont style="font-family:Times New Roman;font-size:10pt;"s and/fontfont style="font-family:Times New Roman;font-size:10pt;" normal sales/fontfont style="font-family:Time s New Roman;font-size:10pt;" exception/fontfont style="font-family:Times New Roman;font-size:10pt;" and other non derivative contracts that are accounted for under the accrual method of accounting./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"The following table provides a summary of the derivative fair value balances recorded by /fontfont style="font-family:Times New Roman;font-size:10pt;"the Registrants/fontfont style="font-family:Times New Roman;font-size:10pt;" as of March 31, 2010:/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 10px; text-al ign:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 80px; text-align:left;border-color:#000000;min-width:80px;"#160;/tdtd colspan="14" rowspan="Aspose.Cells.Range" style="width: 285px; text-align:center;border-color:#000000;min-width:285px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Generation/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" rowspan="Aspose.Cells.Range" style="width: 59px; text-align:center;border-color:#000000;min-width:59px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"ComEd/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" rowspan="Aspose.Cells.Range" style="width: 59px; text- align:center;border-color:#000000;min-width:59px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"PECO/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" rowspan="Aspose.Cells.Range" style="width: 123px; text-align:center;border-color:#000000;min-width:123px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Other/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" rowspan="Aspose.Cells.Range" style="width: 53px; text-align:center;border-color:#000000;min-width:53px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon/font/td/trtr style="height: 17px"td styl e="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 80px; text-align:left;border-color:#000000;min-width:80px;"#160;/tdtd style="width: 43px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:43px;"#160;/tdtd style="width: 5px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 43px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:43px;"#160;/tdtd style="width: 5px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; bo rder-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 43px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:43px;"#160;/tdtd style="width: 5px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 43px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:43px;"#160;/tdtd style="width: 5px; 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border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:43px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"1,139/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"__________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(a)#160;#160;#160;#160;#160;#160;#160;Includes current and noncurrent asset/fontfont style="fo nt-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;" for Generation and /fontfont style="font-family:Times New Roman;font-size:10pt;"current and noncurrent liabilities/fontfont style="font-family:Times New Roman;font-size:10pt;" for ComEd of $/fontfont style="font-family:Times New Roman;font-size:10pt;"429/fontfont style="font-family:Times New Roman;font-size:10pt;" million and /fontfont style="font-family:Times New Roman;font-size:10pt;"$806/fontfont style="font-family:Times New Roman;font-size:10pt;" million, respectively, related to the fair value of Generation's and ComEd's five-year financial swap contract, as described/fontfont style="font-family:Times New Roman;font-size:10pt;" above/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font- size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(b)#160;#160;#160;#160;#160;#160;#160;Represents the netting of fair value balances with the same counterparty and the application of collateral. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(c)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"C/fontfont style="font-family:Times New Roman;font-size:10pt;"urrent and noncurrent assets are shown net of collateral of /fontfont style="font-family:Times New Roman;font-size:10pt;"$774/fontfont style="font-family:Times New Roman;font-size:10pt;" million and /fontfont style="font-family:Times New Roman;f ont-size:10pt;"$550/fontfont style="font-family:Times New Roman;font-size:10pt;" million, respectively, and current/fontfont style="font-family:Times New Roman;font-size:10pt;" and noncurrent/fontfont style="font-family:Times New Roman;font-size:10pt;" liabilities are shown inclusive of collateral of /fontfont style="font-family:Times New Roman;font-size:10pt;"$105/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" and $1 million/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" res/fontfont style="font-family:Times New Roman;font-size:10pt;"pectively. /fontfont style="font-family:Times New Roman;font-size:10pt;"The total cash collateral receive/fontfont style="font-family:Times New Ro man;font-size:10pt;"d /fontfont style="font-family:Times New Roman;font-size:10pt;"and offset against mark/fontfont style="font-family:Times New Roman;font-size:10pt;"-/fontfont style="font-family:Times New Roman;font-size:10pt;"to/fontfont style="font-family:Times New Roman;font-size:10pt;"-/fontfont style="font-family:Times New Roman;font-size:10pt;"market assets and liabilities /fontfont style="font-family:Times New Roman;font-size:10pt;"was /fontfont style="font-family:Times New Roman;font-size:10pt;"$1,430/fontfont style="font-family:Times New Roman;font-size:10pt;" million at /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; ma rgin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(d) Includes current /fontfont style="font-family:Times New Roman;font-size:10pt;"and noncurrent assets for Generation/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"current/fontfont style="font-family:Times New Roman;font-size:10pt;" and noncurrent/fontfont style="font-family:Times New Roman;font-size:10pt;" liabilities for PECO/fontfont style="font-family:Times New Roman;font-size:10pt;" of /fontfont style="font-family:Times New Roman;font-size:10pt;"$1/fontfont style="font-family:Times New Roman;font-size:10pt;" million /fontfont style="font-family:Times New Roman;font-size:10pt;"and $5 million, respectively, /fontfont style="font-family:Times New Roman;font-size:10pt;"re lated to the fair value of PECO's block contracts/fontfont style="font-family:Times New Roman;font-size:10pt;" with Generation/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"There were no netting adjustments or/fontfont style="font-family:Times New Roman;font-size:10pt;" collateral /fontfont style="font-family:Times New Roman;font-size:10pt;"received /fontfont style="font-family:Times New Roman;font-size:10pt;"as of March 31, 2010./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; 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margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(b)#160;#160;#160;#160;#160;#160;#160;Represents the netting of fair value balances with the same counterparty and the application of collat eral. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(c)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"C/fontfont style="font-family:Times New Roman;font-size:10pt;"urrent and noncurrent assets are shown net of collateral of /fontfont style="font-family:Times New Roman;font-size:10pt;"$502/fontfont style="font-family:Times New Roman;font-size:10pt;" million and /fontfont style="font-family:Times New Roman;font-size:10pt;"$376/fontfont style="font-family:Times New Roman;font-size:10pt;" million, respectively, and current liabilities are shown inclusive of collateral of /fontfont style="font-family:Times New Roman;font-size:10pt;"$69/fontfont style="font-family:Times New Roman;font-size:10pt;" mil lion/fontfont style="font-family:Times New Roman;font-size:10pt;", respectively./fontfont style="font-family:Times New Roman;font-size:10pt;" The allocation of collateral had no impact to noncurrent liabilities./fontfont style="font-family:Times New Roman;font-size:10pt;" The total cash collateral received net of cash collateral posted /fontfont style="font-family:Times New Roman;font-size:10pt;"and offset against mark/fontfont style="font-family:Times New Roman;font-size:10pt;"-/fontfont style="font-family:Times New Roman;font-size:10pt;"to/fontfont style="font-family:Times New Roman;font-size:10pt;"-/fontfont style="font-family:Times New Roman;font-size:10pt;"market assets and liabilities /fontfont style="font-family:Times New Roman;font-size:10pt;"was /fontfont style="font-family:Times New Roman;font-size:10pt;"$947/fontfont style="fon t-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" at December 31, 2009./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(d)#160;#160;#160;#160;#160;#160;#160;Includes a noncurrent liability for PECO and a noncurrent asset for Generation of $2 million related to the fair value of PECO's block contracts with Generation. There were no netting adjustments or collateral received as of December 31, 2009./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Cash/fo ntfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;"Flow Hedges (Exelon and Generation)./fontfont style="font-family:Times New Roman;font-size:10pt;"#160;#160;#160;#160;Econo/fontfont style="font-family:Times New Roman;font-size:10pt;"mic hedges that qualify as cash /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges primarily consist of forward power sales and power swaps on base /fontfont style="font-family:Times New Roman;font-size:10pt;"load generation. At March 31, 2010, Generation had net unrealized pre-tax gains on effective cash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges of /fontfont style="font-family:Times New Roman;font-size:10pt;" gt;$/fontfont style="font-family:Times New Roman;font-size:10pt;"2,815/fontfont style="font-family:Times New Roman;font-size:10pt;"#160;million being deferred within accumulat/fontfont style="font-family:Times New Roman;font-size:10pt;"ed OCI, including approximately $1,235/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million related to the financial swap with ComEd. Amounts recorded in accumulated OCI related to c/fontfont style="font-family:Times New Roman;font-size:10pt;"hanges in energy commodity cash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges are reclassified to results of operations when the forecasted purchase or sale of the energy commodity occurs. Reclassifications from OCI are included in operating reve nues, purchased power and fuel in Exelon's and Generation's Consolidated Statements of Operations, depending on the commodities involved in the hedged transaction. Based on market prices at March 31, 2010, approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$840/fontfont style="font-family:Times New Roman;font-size:10pt;"#160;million of these net pre-tax unrealized gains within accumulated OCI are expected to be reclassified from accumulated OCI during the next twelve months by Generation, including approximately $/fontfont style="font-family:Times New Roman;font-size:10pt;"429/fontfont style="font-family:Times New Roman;font-size:10pt;" million related to the financial swap with ComEd. However, the actual amount reclassified from/fontfont style="font-family:Times New Roman;font-size:10pt;" accumulated OCI could vary due to future changes in market prices. Generation expects the settlem/font ;font style="font-family:Times New Roman;font-size:10pt;"ent of the majority of its cash /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges will occur during 2010 through 2012, and the ComEd financial swap contract during 2010 through 2013. /font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Exelon discontinues hedge accounting prospectively when it determines that the derivative is no longer effective in offsetting changes in the cash flows of a hedg/fontfont style="font-family:Times New Roman;font-size:10pt;"ed item, in the case of forward-/fontfont style="font-family:Times New Roman;font-size:10pt;"starting hedges, or /fontfont style="font-family:Times New Roman;font-size:10pt;"when /fontfont style="font-family:Times New Roman;font-size:10pt;"it is no longer probable that the forecasted transaction will occur. For the three/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", amounts/fontfont style="font-family:Times New Roman;font-size:10pt;" reclassified into/fontfont style="font-family:Times New Roman;font-size:10pt;" earnings as a resul/fontfont style="font-family:Times New Roman;font-size:10pt;"t of the discontinuance of cash /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges/fontfont style="font-family:Times New Roman;font-size:10pt;" were immaterial/fontfont style="font-family:Times New Roman;font-size:10pt;". /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160; ;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The tables below provide the activity of /fontfont style="font-family:Times New Roman;font-size:10pt;"accumulated OCI related to cash /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges for the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;", containing information about the change s in the fair value of cash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges and the reclassification from accumulated OCI into results of operations. The amounts reclassified from accumulated OCI, when combined with the impacts of the actual physical power sales, result in the ultimate recognition of net revenues at the contracted price./font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 20px"td style="width: 307px; text-align:left;border-color:#000000;min-width:307px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 108px; text-align:left;border-color:#000000;min-width:108px;"#160;/tdtd style="width: 8px; text-align:left;border- color:#000000;min-width:8px;"#160;/tdtd colspan="6" rowspan="Aspose.Cells.Range" style="width: 197px; text-align:center;border-color:#000000;min-width:197px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"TotalCash FlowHedgeOCIActivity, Net of Income Tax/font/td/trtr style="height: 20px"td style="width: 307px; text-align:left;border-color:#000000;min-width:307px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 108px; text-align:left;border-color:#000000;min-width:108px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 70px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 31px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:31px;"#160;/tdtd style="width: 4px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:4px;"#160;/tdtd style="width: 12px; border-b ottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 68px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:68px;"#160;/td/trtr style="height: 14px"td style="width: 307px; text-align:left;border-color:#000000;min-width:307px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 108px; text-align:left;border-color:#000000;min-width:108px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 82px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:82px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt ;COLOR: #000000;TEXT-ALIGN: center;"Generation/font/tdtd style="width: 31px; text-align:left;border-color:#000000;min-width:31px;"#160;/tdtd style="width: 4px; text-align:left;border-color:#000000;min-width:4px;"#160;/tdtd colspan="2" style="width: 80px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:80px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon/font/td/trtr style="height: 26px"td style="width: 307px; text-align:left;border-color:#000000;min-width:307px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2010/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;" gt;#160;/tdtd style="width: 108px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:108px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Income Statement Location/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 82px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:82px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Energy-Related Hedges/font/tdtd style="width: 31px; text-align:left;border-color:#000000;min-width:31px;"#160;/tdtd style="width: 4px; 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text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000 ;TEXT-ALIGN: right;" 1,152/font/tdtd style="width: 31px; text-align:left;border-color:#000000;min-width:31px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(a)/font/tdtd style="width: 4px; text-align:left;border-color:#000000;min-width:4px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 68px; text-align:right;border-color:#000000;min-width:68px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"551/font/td/trtr style="height: 20px"td style="width: 307px; text-align:left;border-color:#000000;min-width:307px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Effective portio n of changes in fair value/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 108px; text-align:left;border-color:#000000;min-width:108px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;" 669/font/tdtd style="width: 31px; text-align:left;border-color:#000000;min-width:31px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(b)/font/tdtd style="width: 4px; text-align:left;border-color:#000000;min-width:4px;"#160;/tdtd style="width: 12px; tex t-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 68px; text-align:right;border-color:#000000;min-width:68px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;" 467/font/td/trtr style="height: 20px"td style="width: 307px; text-align:left;border-color:#000000;min-width:307px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"ReclassificationsfromaccumulatedOCItonetincome/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 108px; text-align:left;border-color:#000000;min-width:108px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"OperatingRevenue/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style= "width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;" (117)/font/tdtd style="width: 31px; text-align:left;border-color:#000000;min-width:31px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(c)/font/tdtd style="width: 4px; text-align:left;border-color:#000000;min-width:4px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 68px; text-align:right;border-color:#000000;min-width:68px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;" (83)/font/td/trtr style="height: 20px"td style="width: 307px; text-align:left;bo rder-color:#000000;min-width:307px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Ineffective portion recognized in income/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 108px; text-align:left;border-color:#000000;min-width:108px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Purchased Power/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 70px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;" (1) /font/tdtd style="width: 31px; text-align:left;border-color:#000000;min-width:31px;"#160;/tdtd style="width: 4px; text-align:left;border-color:#000000;min-width:4px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 68px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:68px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;" (1)/font/td/trtr style="height: 8px"td style="width: 307px; text-align:left;border-color:#000000;min-width:307px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 108px; text-align:left;border-color:#000000;min-width:108px;"#160;/td td style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 31px; text-align:left;border-color:#000000;min-width:31px;"#160;/tdtd style="width: 4px; text-align:left;border-color:#000000;min-width:4px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 68px; text-align:left;border-color:#000000;min-width:68px;"#160;/td/trtr style="height: 20px"td style="width: 307px; text-align:left;border-color:#000000;min-width:307px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Accumulated OCI derivative gain at March 31, 2010/font/ tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 108px; text-align:left;border-color:#000000;min-width:108px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 70px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"1,703/font/tdtd style="width: 31px; text-align:left;border-color:#000000;min-width:31px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-A LIGN: left;"(a)(d)/font/tdtd style="width: 4px; text-align:left;border-color:#000000;min-width:4px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 68px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:68px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"934/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:12pt;margin-left:0px;"__________/font/pp s tyle='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(a)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Includes $746 million and $/fontfont style="font-family:Times New Roman;font-size:10pt;"585 million /fontfont style="font-family:Times New Roman;font-size:10pt;"of gains, net of taxes, related to the fair /fontfont style="font-family:Times New Roman;font-size:10pt;"value of the five-/fontfont style="font-family:Times New Roman;font-size:10pt;"year financial swap contract with ComEd/fontfont style="font-family:Times New Roman;font-size:10pt;", and /fontfont style="font-family:Times New Roman;font-size:10pt;"$4/fontfont style="font-family:Times New Roman;font-size:10pt;" million and $1/fontfont style="font-family:Times New Roman;font-size:10pt;" million of gains, net of taxes, related to the fair value of the block contracts with PECO/fontfont style="font-family:Times New Roman;font-size:10pt;" as of March 31, 2010 and /fontfont style="font-family:Times New Roman;font-size:10pt;"December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;", respectively./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(b)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Includes/fontfont style="font-family:Times New Roman;font-size:10pt;" a /fontfont style="font-family:Times New Roman;font-size:10pt;"$195/fontfont style="font-family:Times New Roman;font - -size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"gain/fontfont style="font-family:Times New Roman;font-size:10pt;", net of taxes, /fontfont style="font-family:Times New Roman;font-size:10pt;"related to /fontfont style="font-family:Times New Roman;font-size:10pt;"the effective portion of changes in fair value of the five-year financial swap contract with ComEd/fontfont style="font-family:Times New Roman;font-size:10pt;", and /fontfont style="font-family:Times New Roman;font-size:10pt;"a /fontfont style="font-family:Times New Roman;font-size:10pt;"$3/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million/fontfont style="font-family:Times New Roman;font-size:10pt;" gai n, net of taxes, o/fontfont style="font-family:Times New Roman;font-size:10pt;"f the effective portion of changes in fair value of the block contracts with PECO/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"for the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" months ended March 31, 2010./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(c)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Includes /fontfont style="font-family:Times New Roman;font-size:10pt;"a /fontfont style="font-family:Times New Roman;font-size:10pt;"$34 million loss, net of ta xes, of reclassifications from accumulated OCI to net income related to the settlements of the five/fontfont style="font-family:Times New Roman;font-size:10pt;"-year financial/fontfont style="font-family:Times New Roman;font-size:10pt;" swap contract with ComEd for the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(d)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Excludes $5/fontfont style="font-family:Times New Roman;font-si ze:10pt;" million gain/fontfont style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;", net of taxes, related to interest rate s/fontfont style="font-family:Times New Roman;font-size:10pt;"waps settled in 2010/fontfont style="font-family:Times New Roman;font-size:10pt;". /font/pp style='margin-top:0pt; 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text-align:left;border-color:#000000;min-width:22px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(a)/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 12px; border-top-style :solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 70px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;" 1,088/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:12pt;margin-left:0px;"__________/font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(a)/fontfont style="font-family:Times Ne w Roman;font-size:10pt;"#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Includes $/fontfont style="font-family:Times New Roman;font-size:10pt;"712/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million and $/fontfont style="font-family:Times New Roman;font-size:10pt;"275/fontfont style="font-family:Times New Roman;font-size:10pt;" million of /fontfont style="font-family:Times New Roman;font-size:10pt;"gains/fontfont style="font-family:Times New Roman;font-size:10pt;", net of taxes, related to the fair value of the five-year financial swap contract with ComEd as of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt ;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"December 31/fontfont style="font-family:Times New Roman;font-size:10pt;", 2008/fontfont style="font-family:Times New Roman;font-size:10pt;", respectively./font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(b)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Includes /fontfont style="font-family:Times New Roman;font-size:10pt;"a /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"453/fontfont style="font-family:Times New Roman;font-size:10pt;" million gain/fontfont style="font-family:Times New Roman;font-size:10pt;", net of taxes, /font ;font style="font-family:Times New Roman;font-size:10pt;"related to/fontfont style="font-family:Times New Roman;font-size:10pt;" the effective portion of changes in fair value of the five-year financial swap contract with ComEd /fontfont style="font-family:Times New Roman;font-size:10pt;"during/fontfont style="font-family:Times New Roman;font-size:10pt;" the three months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(c)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Includes /fontfont style="font-family:Times New Roman;font-size:10pt;"a /fontfont style="f ont-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"16/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million loss/fontfont style="font-family:Times New Roman;font-size:10pt;", net of taxes, of /fontfont style="font-family:Times New Roman;font-size:10pt;"reclassifications from accumulated OCI to net income related to the settlements of /fontfont style="font-family:Times New Roman;font-size:10pt;" the five-year financial swap contract with ComEd /fontfont style="font-family:Times New Roman;font-size:10pt;"for/fontfont style="font-family:Times New Roman;font-size:10pt;" the three months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" gt;./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"During the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and 2009/fontfont style="font-family:Times New Roman;font-size:10pt;", Generation's cash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedge activity impact to pre-tax lt;/fontfont style="font-family:Times New Roman;font-size:10pt;"earnings based on the reclassification adjustment from accumulated OCI to earnings was a /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"194/fontfont style="font-family:Times New Roman;font-size:10pt;" million pre-tax gain/fontfont style="font-family:Times New Roman;font-size:10pt;" and a /fontfont style="font-family:Times New Roman;font-size:10pt;"$240/fontfont style="font-family:Times New Roman;font-size:10pt;" million pre-tax gain, respectively/fontfont style="font-family:Times New Roman;font-size:10pt;". Given that the cash /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges primarily consist of forward power sales and power swaps and do not include gas options or sales, the ineffectiveness of Generation's cas h/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges is primarily the result of differences between the locational settlement prices of the cash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedges and the hedged generating units. This price difference is actively managed through other instruments which include financial transmission rights, whose changes in fair value are recognized in earnings each period, and auction /fontfont style="font-family:Times New Roman;font-size:10pt;"revenue rights. During the three /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010, /fontfont style="font-family:Times New Roman;font-size:10pt;"c ash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedge ineffectiveness changed by $/fontfont style="font-family:Times New Roman;font-size:10pt;"1/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"due primarily to the change in market prices during the period, of which none was related to Generation's financial swap contract with ComEd/fontfont style="font-family:Times New Roman;font-size:10pt;" or Generation's block contracts with PECO/fontfont style="font-family:Times New Roman;font-size:10pt;". At /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" ;, cash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedge ineffectiveness resulted in an adjustment of /fontfont style="font-family:Times New Roman;font-size:10pt;"$1/fontfont style="font-family:Times New Roman;font-size:10pt;" million to accumulated OCI on the balance sheet in order to reflect the effective portion of derivative gains or losses. During the /fontfont style="font-family:Times New Roman;font-size:10pt;"t/fontfont style="font-family:Times New Roman;font-size:10pt;"hree/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;", cash/font t;font style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedge ineffecti/fontfont style="font-family:Times New Roman;font-size:10pt;"veness/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"changed by $/fontfont style="font-family:Times New Roman;font-size:10pt;"5/fontfont style="font-family:Times New Roman;font-size:10pt;" million due primarily to the change in market prices during the period, of which /fontfont style="font-family:Times New Roman;font-size:10pt;"none/fontfont style="font-family:Times New Roman;font-size:10pt;" was related to Generation's financial swap contract with ComEd. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;" gt;Exelon's /fontfont style="font-family:Times New Roman;font-size:10pt;"energy-related /fontfont style="font-family:Times New Roman;font-size:10pt;"cash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedge activity impact to pre-tax earnings based on the reclassification adjustment from accumulated OCI to earnings was a $/fontfont style="font-family:Times New Roman;font-size:10pt;"138/fontfont style="font-family:Times New Roman;font-size:10pt;" million pre-tax gain/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"$214/fontfont style="font-family:Times New Roman;font-size:10pt;" million pre-tax gain/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-fami ly:Times New Roman;font-size:10pt;"for the three months ended March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and March 31, 2009, respectively./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Changes in c/fontfont style="font-family:Times New Roman;font-size:10pt;"ash/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"flow hedge ineffe/fontfont style="font-family:Times New Roman;font-size:10pt;"ctiveness/fontfont style="font-family:Times New Roman;font-size:10pt;", primarily due to changes in market prices, were/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"$1/fontfont style="font-family:Tim es New Roman;font-size:10pt;" million and /fontfont style="font-family:Times New Roman;font-size:10pt;"$5/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million for the three months ended March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and 2009/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" respectively./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:36px;"Other Derivatives (Exelon and Generation)./fontfont style="font-family:Times New Roman;font-size:10pt;" Other derivative contracts are those that do not qualify or are not designated for hedge accounting. These instruments represent economic hedges that mitigate exposure to fluctuations in commodity prices and include financial options, futures, swaps, a/fontfont style="font-family:Times New Roman;font-size:10pt;"nd forward sales. For the three m/fontfont style="font-family:Times New Roman;font-size:10pt;"onths ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;", the following net pre-tax mark-to-market gains (losses) /fontfont style="font-family:Times New Roman;font-size:10pt;"of certain purchase and sale contracts/fontfont style="font-family:Times New Roman;font-size:10pt;" were reported in fuel and purchased power expense at Exelo n and Generation in the Consolidated S/fontfont style="font-family:Times New Roman;font-size:10pt;"tatements of Operations and/fontfont style="font-family:Times New Roman;font-size:10pt;" are included/fontfont style="font-family:Times New Roman;font-size:10pt;" in n/fontfont style="font-family:Times New Roman;font-size:10pt;"et fair value changes related to derivatives/fontfont style="font-family:Times New Roman;font-size:10pt;" in Exelon's and Generation's Consolidated Statements of Cash Flows. /fontfont style="font-family:Times New Roman;font-size:10pt;"In the tables below, "Change in fair value" represents the change in fair value of the derivative contracts held at the reporting date. The "Reclassification to realized at settlement" represents the recognized change in fair value that was reclassified to realized due to settlement of the derivative during the period. /fontfont style="font-family:Ti mes New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 13px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"#160;/tdtd colspan="8" style="width: 202px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:202px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon and Generation/font/td/trtr style="height: 13px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:62px;"fon t style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Purchased/font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:center;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:center;border-color:#000000;min-width:50px;"#160;/td/trtr style="height: 13px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZ E: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2010/font/tdtd colspan="2" style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Power/font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Fuel/font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;m in-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Total/font/td/trtr style="height: 17px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Change in fair value/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"253/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;" font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"47/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"300/font/td/trtr style="height: 17px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt; COLOR: #000000;"Reclassification to realized at settlement/font/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(69)/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="widt h: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(68)/font/td/trtr style="height: 18px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" Net mark-to-market gains/font/tdtd style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-wid th:3px;text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"184/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"48/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; border-top-sty le:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"232/font/td/trtr style="height: 18px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/td td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/td/trtr style="height: 17px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"#160;/tdtd colspan="8" style="width: 202px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:202px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon and Generation/font/td/trtr style="height: 17px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"#160;/tdtd colspan="2" style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Purchased/font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:center;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:center;border- color:#000000;min-width:50px;"#160;/td/trtr style="height: 17px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2009/font/tdtd colspan="2" style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Power/font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-A LIGN: center;"Fuel/font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:62px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Total/font/td/trtr style="height: 17px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Change in fair value/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FO NT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"256/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(43)/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style ="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"213/font/td/trtr style="height: 17px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Reclassification to realized at settlement/font/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(46)/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text - -align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"23/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(23)/font/td/trtr style="height: 18px"td style="width: 423px; text-align:left;border-color:#000000;min-width:423px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" Net mark-to-market gains (losses)/font/tdtd style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-a lign:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"210/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;b order-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(20)/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"190/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:5pt'font style="fo nt-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:36px;"Proprietary Trading Activities (/fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;"Exelon and /fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;"Generation)./fontfont style="font-family:Times New Roman;font-size:10pt;" For the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;", Exelon and Generation recogn ized the following net unrealized mark-to-market gains (losses), net realized mark-to-market gains (losses) and total net mark-to-market gains (losses) (before income taxes) relating to mark-to-market activity on derivative instruments entered into for proprietary trading purposes. Gains and losses associated with proprietary trading are reported as /fontfont style="font-family:Times New Roman;font-size:10pt;"operating /fontfont style="font-family:Times New Roman;font-size:10pt;"revenue in Exelon's and Generation's Consolidated Statements of Operations and Comprehensiv/fontfont style="font-family:Times New Roman;font-size:10pt;"e Income and are included in Net/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"fair value changes related to derivatives and nuclear decommissioning trust funds/fontfont style="font-family:Times New Roman;font-size:10pt ;" in Exelon's and Generation's Consolidated Statements of Cash Flows./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"In the tables below, "Change in fair value" represents the change in fair value of the derivative contracts held at the reporting date. The "Reclassification to realized at settlement" represents the recognized change in fair value that was reclassified to realized due to settlement of the derivative during the period./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"#160;/tdtd style="width: 150px; text-align:left;border-color:#000000;min-width:150px;"#160; ;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd colspan="5" style="width: 138px; text-align:center;border-color:#000000;min-width:138px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Three Months Ended/font/td/trtr style="height: 17px"td style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"#160;/tdtd style="width: 150px; text-align:center;border-color:#000000;min-width:150px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;" Location on Income /font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd colspan="5" style="width: 138px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-w idth:138px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"March 31,/font/td/trtr style="height: 17px"td style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"#160;/tdtd style="width: 150px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:150px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Statement/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd colspan="2" style="width: 63px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:63px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: cente r;"2010/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd colspan="2" style="width: 63px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:63px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2009/font/td/trtr style="height: 17px"td style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Change in fair value/font/tdtd style="width: 150px; text-align:left;border-color:#000000;min-width:150px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Operating Revenue/font/tdtd style="width: 12px; text-align:left;border-color :#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 7/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" -/font/td/trtr style="height: 17px"td style="width: 325px; text-align:left;border - -color:#000000;min-width:325px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Reclassification to realized at settlement/font/tdtd style="width: 150px; text-align:left;border-color:#000000;min-width:150px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Operating Revenue/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 51px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:51px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" (6)/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#0000 00;min-width:12px;"#160;/tdtd style="width: 51px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:51px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" (21)/font/td/trtr style="height: 17px"td style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"#160;/tdtd style="width: 150px; text-align:left;border-color:#000000;min-width:150px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 51px; text-align:left;border-color:#000000;min-width:51px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left ;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 51px; text-align:left;border-color:#000000;min-width:51px;"#160;/td/trtr style="height: 18px"td style="width: 325px; text-align:left;border-color:#000000;min-width:325px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" Net mark-to-market gains (losses)/font/tdtd style="width: 150px; text-align:left;border-color:#000000;min-width:150px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Operating Revenue/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 51px; border-bottom-style:double;border-bottom-wid th:3px;text-align:right;border-color:#000000;min-width:51px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 1/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 51px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:51px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" (21)/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:0px;"Credit Risk (Exelon, Generation, Com Ed and PECO)/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The Registrants would be exposed to credit-related losses in the event of non-performance by counterparties that enter into derivative instruments. The credit exposure of derivative contracts, before collateral, is represented by the fair value of contracts at the reporting date. For energy-related derivative instruments, Generation enters into enabling agreements that allow for payment netting with its counterparties, which reduces Generation's exposure to counterparty risk by providing for the offset of amounts payable to the counterparty against amounts receivable from the counterparty. Typically, each enabling agreement is for a specific commodity and so, with respect to each individual counterparty, netting is limited to transactions involving that specific commodity product, except where master netting agreements exist with a counterparty that allow for cross product netting. In addition to payment netting language in the enabling agreement, Generation's credit department establishes credit limits, margining thresholds and collateral requirements for each counterparty, which are defined in the derivative contracts. Counterparty credit limits are based on an internal credit review that considers a variety of factors, including the results of a scoring model, leverage, liquidity, profitability, credit ratings and risk management capabilities. To the extent that a counterparty's margining thresholds are exceeded, the counterparty is required to post collateral with Generation as specified in each enabling agreement. Generation's credit department monitors current and forward credit exposure to counterparties and their affiliates, both on an individual and an aggregate basis. / font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The following tables provide information on Generation's credit exposure for all derivative/fontfont style="font-family:Times New Roman;font-size:10pt;" instruments, normal purchase/fontfont style="font-family:Times New Roman;font-size:10pt;" normal sales, and applicable payables and receivables, net of collateral and instruments that are subject to master netting agreements, as of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;". The tables further delineate that exposure by credit rating of the counterparties and provide guidance on the concentration of credit risk to individual counterparties /fontfont style="font-family:Time s New Roman;font-size:10pt;"and an indication of the maturity of a company's credit risk /fontfont style="font-family:Times New Roman;font-size:10pt;"by credit rating of the counterparties. The figures in the tables below do not include credit risk exposure from uranium procurement contracts or /fontfont style="font-family:Times New Roman;font-size:10pt;"exposure /fontfont style="font-family:Times New Roman;font-size:10pt;"through RTOs, ISOs and NYMEX and /fontfont style="font-family:Times New Roman;font-size:10pt;"ICE commodity exchanges/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"which are discussed below. Additionally, the figures in the tables below do not include exposures with affiliates, including net receivables with ComEd and PECO of /fontfont style="font-family:Times New Roman;font-size:10pt;"$/font ;font style="font-family:Times New Roman;font-size:10pt;"112 /fontfont style="font-family:Times New Roman;font-size:10pt;"million /fontfont style="font-family:Times New Roman;font-size:10pt;"and /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"147/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;", respectively/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 232px; text - -align:left;border-color:#000000;min-width:232px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 79px; text-align:center;border-color:#000000;min-width:79px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Total/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 44px; text-align:left;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 44px; text-align:left;border-color:#000000;min - -width:44px;"#160;/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 84px; text-align:center;border-color:#000000;min-width:84px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Number of/font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 84px; text-align:center;border-color:#000000;min-width:84px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Net Exposure of/font/td/trtr style="height: 17px"td style="width: 232px; text-align:left;border-color:#000000;min-width:232px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 79px; text-align:center;border-color:#000000;min-width:79px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exposure/font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 44px; text-align:left;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 44px; text-align:left;border-color:#000000;min-width:44px;"#160;/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 84p x; text-align:center;border-color:#000000;min-width:84px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Counterparties/font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 84px; text-align:center;border-color:#000000;min-width:84px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Counterparties/font/td/trtr style="height: 17px"td style="width: 232px; text-align:left;border-color:#000000;min-width:232px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 79px; text-align:center;border-color:#000000;min-width:79px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Before Credit/font/tdtd style="width: 8px; 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text-align:left;border-color:#000000;min-width:232px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" Internally rated - investment grade/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"48/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 44px; text-align:right;border-color:#000000;min-width:44px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 44px; 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text-align:left;border-color:#000000;min-width:521px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 55px; text-align:left;border-color:#000000;min-width:55px;"#160;/tdtd style="width: 20px; text-align:lef t;border-color:#000000;min-width:20px;"#160;/td/trtr style="height: 17px"td style="width: 521px; text-align:left;border-color:#000000;min-width:521px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Financial institutions/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 252/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/td/trtr style="height: 17px"td style="width: 521px; text-align:left;border-color :#000000;min-width:521px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Investor-owned utilities, marketers and power producers/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 609/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/td/trtr style="height: 17px"td style="width: 521px; text-align:left;border-color:#000000;min-width:521px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Coal/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:1 6px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 4/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/td/trtr style="height: 17px"td style="width: 521px; text-align:left;border-color:#000000;min-width:521px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Other/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman ;FONT-SIZE: 10pt;COLOR: #000000;" 106/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/td/trtr style="height: 18px"td style="width: 521px; text-align:left;border-color:#000000;min-width:521px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 13px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 55px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 971/font/tdtd style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"ComEd's power procurement contracts provide suppliers with a certain amount of unsecured credit. The credit position is based on the price of energy in the spot market compared to the /fontfont style="font-family:Times New Roman;font-size:10pt;"benchmark prices/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"The benchmark prices are the future prices of energy projected through the contract term and are set at the point of contract execution. /fontfont style="font-fam ily:Times New Roman;font-size:10pt;"If the price of energy in the spot market exceeds the /fontfont style="font-family:Times New Roman;font-size:10pt;"benchmark/fontfont style="font-family:Times New Roman;font-size:10pt;" price, the suppliers are required to post /fontfont style="font-family:Times New Roman;font-size:10pt;"collateral for the secured credit portion. The unsecured credit used by the suppliers represents ComEd's/fontfont style="font-family:Times New Roman;font-size:10pt;" net/fontfont style="font-family:Times New Roman;font-size:10pt;" credit exposure. /fontfont style="font-family:Times New Roman;font-size:10pt;"As of March 31, 2010, ComEd/fontfont style="font-family:Times New Roman;font-size:10pt;"'s /fontfont style="font-family:Times New Roman;font-size:10pt;"net /fontfont style="font-family:Times New Roman;font-size:10pt;"credit exposure to suppl iers was immaterial and/fontfont style="font-family:Times New Roman;font-size:10pt;" either/fontfont style="font-family:Times New Roman;font-size:10pt;" did not exceed the/fontfont style="font-family:Times New Roman;font-size:10pt;" allowed/fontfont style="font-family:Times New Roman;font-size:10pt;" unsecured/fontfont style="font-family:Times New Roman;font-size:10pt;" credit/fontfont style="font-family:Times New Roman;font-size:10pt;" levels/fontfont style="font-family:Times New Roman;font-size:10pt;" or did not exceed the allowed unsecured credit levels by an amount necessary to trigger a collateral call./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"ComEd is permitted to recover its costs of procuring energy thr ough the Illinois Settlement Legislation as well as the ICC-approved procurement tariffs. ComEd's counterparty credit risk is mitigated by its ability to recover realized energy costs through customer rates. See Note /fontfont style="font-family:Times New Roman;font-size:10pt;"2 /fontfont style="font-family:Times New Roman;font-size:10pt;"of/fontfont style="font-family:Times New Roman;font-size:10pt;" the 2009 Form 10-K /fontfont style="font-family:Times New Roman;font-size:10pt;"for further information. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"PECO has a PPA with Generation under which Generation has agreed to supply PECO with all of PECO's electric supply needs through 2010 at prices that are below current market prices. The price for this electricity is essentially equal to the energy revenues earned from customers. PECO could be negatively affected if Generation could not perform under the PPA./font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"PECO's supplier master agreements th/fontfont style="font-family:Times New Roman;font-size:10pt;"at govern the terms of its DSP P/fontfont style="font-family:Times New Roman;font-size:10pt;"rogram contracts, which define a supplier's performance assurance requirements, allow a supplier to meet its credit requirements with a certain amount of unsecured credit. The amount of unsecured credit is determined based on the supplier's lowest credit rating from Samp;P, Fitch or Moody's and the supplier's tangible net worth. The credit position is based on the initial market price, which is the forward price of energy on the day a transaction is executed, compared to the current forward price curve for energy. To the extent that the forward price curve for energy exceeds the initial market price, the supplier is required to post collateral to the extent the credit exposure is greater than the supplier's unsecured credit limit. As of March 31, 2010, PECO had no net credit exposure to energy suppliers./font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"PECO is permitted to recover its costs of procuring electric generation following the expiration of its electric generation rate caps on December 31, 2010 /fontfont style="font-family:Times New Roman;font-size:10pt;"through its PAPUC-approved DSP P/fontfont style="font-family:Times New Roman;font-size:10pt;"rogram. PECO's counterparty credit risk is mitigated by its ability to recover realized energy costs through customer rates. /fontfont style="font-family:Times New Roman;font-size:10pt;"See /fontfont style="font-family:Times New Roman;font-size:10pt;"N ote /fontfont style="font-family:Times New Roman;font-size:10pt;"2 /fontfont style="font-family:Times New Roman;font-size:10pt;"of/fontfont style="font-family:Times New Roman;font-size:10pt;" the 2009 Form 10-K/fontfont style="font-family:Times New Roman;font-size:10pt;" for further information./font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"PECO's natural gas procurement plan is reviewed and approved annually on a prospective basis by the PAPUC. PECO's counterparty credit risk under its natural gas supply and management agreements is mitigated by its ability to recover its natural gas costs through the PGC, which allows PECO to adjust rates quarterly to reflect realized natural gas prices. PECO does not obtain collateral from suppliers under its natural gas supply and management agreements. As of March 31, 2010, PECO had credit exposure /fontfont style="font-family:Times New Roman;font-size:10pt;"of $/fontfont style="font-family:Times New Roman;font-size:10pt;"2/fontfont style="font-family:Times New Roman;font-size:10pt;" million under its natural gas supply and management agreements. /font/pp style='margin-top:5pt; margin-bottom:5pt'#160;/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:0px;"Collateral and Contingent-Related Features (Exelon, Generation, ComEd, and PECO) /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"As part of the normal course of business, Generation routinely enters into physical or financially settled contracts for the purchase and sale of electric capacity, energy, fuels and emissions allowances. Certain of Generati on's derivative instruments contain provisions that require Generation to post collateral. This collateral may be posted in the form of cash or credit support with thresholds contingent upon Generation's credit rating from each of the major credit rating agencies. The collateral and credit support requirements vary by contract and by counterparty. These credit-risk-related contingent features stipulate that if Generation were to be downgraded or lose its investment grade credit rating (based on its senior unsecured debt rating)/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" it would be required to provide additional collateral. Where applicable, this incremental collateral requirement allows for the offsetting of derivative instruments that are assets with the same counterparty, where the contractual right of offset exists under applicable master netting agreements. Generation also enters into commodit y transactions on NYMEX and ICE. The NYMEX and ICE clearing houses act as the counterparty to each trade. Transactions on the NYMEX and ICE must adhere to comprehensive collateral and margining requirements. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The aggregate fair value of all derivative instruments with credit-risk-related contingent features/fontfont style="font-family:Times New Roman;font-size:10pt;" in a liability position that are not fully collateralized (/fontfont style="font-family:Times New Roman;font-size:10pt;"excluding transactions on NYMEX and IC/fontfont style="font-family:Times New Roman;font-size:10pt;"E that are fully collateralized)/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"was $1,324/fontfont style="font-f amily:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million and $894 million as of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" respectively. As of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and December 31, 2009, /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation had the contractual right of offset of /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"1,259/fontfont styl e="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" and $778 million, respectively,/fontfont style="font-family:Times New Roman;font-size:10pt;" related to derivative instruments that are assets with the same counterparty under master netting agreements, resulting in /fontfont style="font-family:Times New Roman;font-size:10pt;"a net liability position of /fontfont style="font-family:Times New Roman;font-size:10pt;"$65/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" and $116 million, respectively/fontfont style="font-family:Times New Roman;font-size:10pt;". If Generation had been downgraded to the investment grade rating of BBB- /fontfont style="font-family:Times New Roman;font-size:10pt;"and Baa3/fontfont style="font-famil y:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" or lost its investment grade credit rating, it would have been required to provide incremental/fontfont style="font-family:Times New Roman;font-size:10pt;" collateral of approximately $57 million /fontfont style="font-family:Times New Roman;font-size:10pt;"or /fontfont style="font-family:Times New Roman;font-size:10pt;"$634/fontfont style="font-family:Times New Roman;font-size:10pt;" million, respectively, /fontfont style="font-family:Times New Roman;font-size:10pt;"as of March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and approximately $60 million or $673 million, respectively, as of December 31, 2009 /fontfont style="font-family:Times New Roman;font-size:10pt;"related to its financial instruments, including derivatives, non-derivatives, normal purchase n ormal sales contracts and applicable payables and receivables/fontfont style="font-family:Times New Roman;font-size:10pt;", net of the contractual right of offset under master netting agreements and the applic/fontfont style="font-family:Times New Roman;font-size:10pt;"ation of collateral./fontfont style="font-family:Times New Roman;font-size:10pt;" See /fontfont style="font-family:Times New Roman;font-size:10pt;"Note /fontfont style="font-family:Times New Roman;font-size:10pt;"18 of the 2009 Form 10-K/fontfont style="font-family:Times New Roman;font-size:10pt;" for further information/fontfont style="font-family:Times New Roman;font-size:10pt;" regarding the letters of credit supporting the cash collateral/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='ma rgin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"Beginning in /fontfont style="font-family:Times New Roman;font-size:10pt;"2007/fontfont style="font-family:Times New Roman;font-size:10pt;", under the /fontfont style="font-family:Times New Roman;font-size:10pt;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;" auction rules and the /fontfont style="font-family:Times New Roman;font-size:10pt;"Supplier Forward Contracts (SFC)/fontfont style="font-family:Times New Roman;font-size:10pt;" tha/fontfont style="font-family:Times New Roman;font-size:10pt;"t ComEd entered into with counterparty suppliers, including Generation, collateral postings are one-sided from suppliers. Generation entered into similar supplier forward contracts with Ameren/fontfont style="font-family:Times New Roman;font-size:10pt;" C orporation (Ameren)/fontfont style="font-family:Times New Roman;font-size:10pt;", with one-sided collateral postings only from Generation. If market prices fall below ComEd's or Ameren's benchmark price levels, ComEd or Ameren are not required to post collateral; however, when market prices rise above benchmark price levels with ComEd or Ameren, counterparty suppliers, including Generation, are required to post collateral once certain unsecured credit limits are exceeded. Under the terms of the five-year financial swap contract between Generation and ComEd,/fontfont style="font-family:Times New Roman;font-size:10pt;" if a party is downgraded below investment grade by Moody's or Samp;P, collateral postings would be required by that party depending on how market prices compare to the benchmark price levels. /fontfont style="font-family:Times New Roman;font-size:10pt;"Under /fontfont style="font-family:Times New Roman;font-size:10pt;"the terms of the financial swap contracts,/fontfont style="font-family:Times New Roman;font-size:10pt;" collateral postings /fontfont style="font-family:Times New Roman;font-size:10pt;"will never /fontfont style="font-family:Times New Roman;font-size:10pt;"exceed $200 million from either ComEd or Generation./fontfont style="font-family:Times New Roman;font-size:10pt;" Beginning in June 2009, under the terms of ComEd's/fontfont style="font-family:Times New Roman;font-size:10pt;" standard block energy contracts, collateral postings are /fontfont style="font-family:Times New Roman;font-size:10pt;"one-sided from suppliers, including Generation/fontfont style="font-family:Times New Roman;font-size:10pt;", should exposures /fontfont style="font-family:Times New Roman;font-size:10pt;"between market prices and /fontfont style="font-family:Times New Roman;font-size:10pt;"benchmark ;/fontfont style="font-family:Times New Roman;font-size:10pt;" prices exceed established unsecured credit /fontfont style="font-family:Times New Roman;font-size:10pt;"limits outlined in the contracts/fontfont style="font-family:Times New Roman;font-size:10pt;". As of March 31, 2010, there was no cash collateral or letters of credit posted between/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"energy/fontfont style="font-family:Times New Roman;font-size:10pt;" suppliers, including Generation, and ComEd, under any of the above/fontfont style="font-family:Times New Roman;font-size:10pt;"-mentioned contracts. See /fontfont style="font-family:Times New Roman;font-size:10pt;"Note /fontfont style="font-family:Times New Roman;font-size:10pt;"2 /fontfont style="font-family:Times New Roman;font- size:10pt;"of/fontfont style="font-family:Times New Roman;font-size:10pt;" the 2009 Form 10-K /fontfont style="font-family:Times New Roman;font-size:10pt;"for further information./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"There are no collateral-related provisions included in the PPA between PECO and Generation. PECO's supplier master agreements th/fontfont style="font-family:Times New Roman;font-size:10pt;"at govern the terms of its DSP P/fontfont style="font-family:Times New Roman;font-size:10pt;"rogram contracts do not contain provisions that would require PECO to post collateral. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"PECO's natural ga s procurement contracts contain provisions that could require PECO to post collateral. This collateral may be posted in the form of cash or credit support with thresholds contingent upon PECO's credit rating from Moody's and Samp;P. The collateral and credit support requirements vary by contract and by counterparty. As of March 31, 2010, PECO was not required to post collateral for any of these agreements. If PECO lost its investment grade credit rating as of March 31, 2010, PECO could have been required to post /fontfont style="font-family:Times New Roman;font-size:10pt;"approximately $/fontfont style="font-family:Times New Roman;font-size:10pt;"58/fontfont style="font-family:Times New Roman;font-size:10pt;" million of collateral to its counterparties. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"Exelon's interest /fontfont style="font - -family:Times New Roman;font-size:10pt;"rate swaps contain provisions that, in the event of a merger, /fontfont style="font-family:Times New Roman;font-size:10pt;"require that /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon's debt maintain an investment grade credit rating from Moody's or Samp;P. If Exelon's debt were to fall below investment grade, it would be in violation of these provisions, resulting in the ability of the counterparty to terminate the agreement prior to maturity. Collateralization would not be required under any circumstance. Termination of the agreement could result in a settlement payment by Exelon or the counterparty on any interest/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"rate swap in a net liability position. The settlement amount would be equal to the fair value of the swap on the termination date. As of March 31, 2010, Exelon's interest/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"rate swap was in an asset po/fontfont style="font-family:Times New Roman;font-size:10pt;"sition, with a fair value of /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"12/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:0px;"Accounting for the Offsetting of Amounts Related to Certain Contracts (Exelon and Generation) /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:T imes New Roman;font-size:10pt;margin-left:36px;"As of March 31, 2010 and December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"1 /fontfont style="font-family:Times New Roman;font-size:10pt;"million and $/fontfont style="font-family:Times New Roman;font-size:10pt;"6/fontfont style="font-family:Times New Roman;font-size:10pt;" million, respectively, of cash collateral received/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"was not offset against net derivative positions, because they were not associated with energy-related derivatives./font/p

Retirement Benefits	3 Months Ended
Retirement Benefits	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Retirement Benefits (Exelon, Generation, ComEd and PECO)	p style='margin-top:5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"7.#160;#160;#160;#160;Retirement Benefits (Exelon, Generation, ComEd and PECO) /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24px;"Exelon sponsors defined benefit pension plans and postretirement benefit plans for essentially all Generation, ComEd, PECO and /fontfont style="font-family:Times New Roman;font-size:10pt;"BSC/fontfont style="font-family:Times New Roman;font-size:10pt;" employees. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; marg in-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.25px;"Defined Benefit Pension and Other Postretirement Benefits /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24px;"During the first quarter of /fontfont style="font-family:Times New Roman;font-size:10pt;"2010/fontfont style="font-family:Times New Roman;font-size:10pt;", Exelon received an updated valuation of its pension and other postretirement benefit obligations to reflect actual census data as of January 1, /fontfont style="font-family:Times New Roman;font-size:10pt;"2010/fontfont style="font-family:Times New Roman;font-size:10pt;". This valuation resulted in an /fontfont style="font-family:Times New Roman;font-size:10pt;"in crease t/fontfont style="font-family:Times New Roman;font-size:10pt;"o the pension obligations of /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"13/fontfont style="font-family:Times New Roman;font-size:10pt;" million and a /fontfont style="font-family:Times New Roman;font-size:10pt;"decrease/fontfont style="font-family:Times New Roman;font-size:10pt;" to other postretirement obligations of /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"18/fontfont style="font-family:Times New Roman;font-size:10pt;" million. Additionally, /fontfont style="font-family:Times New Roman;font-size:10pt;"accumulated other comprehensive loss /fontfont style="font-family:Times New Roman;font-size:10pt;"increase d/fontfont style="font-family:Times New Roman;font-size:10pt;" by approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"18/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" (after-tax). The impact to /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon's /fontfont style="font-family:Times New Roman;font-size:10pt;"Consolidated Statement of Opera/fontfont style="font-family:Times New Roman;font-size:10pt;"tions and Comprehensive Income wa/fontfont style="font-family:Times New Roman;font-size:10pt;"s /fontfont style="font-family:Times New Roman;font-size:10pt;"not material./font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Ti mes New Roman;font-size:10pt;margin-left:24.5px;"The following tables present the components of Exelon's net periodic benefit costs for the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;". The /fontfont style="font-family:Times New Roman;font-size:10pt;"2010/fontfont style="font-family:Times New Roman;font-size:10pt;" pension benefit cost is calculated using an expected long-term rate of return on plan assets of 8.50%. The /fontfont style="font-family:Times New Roman;font-size:10pt;"2010/fontfont style="font-family:Times New Roman;font-size:10pt;" other postretirement benefit cost is calculated using an expected long-term rate /fontfont style="font-family:Times New Roman;font-size:10pt;"of return on plan assets of 7.83/fontfont style="font-family:Times New Roman;font-size:10pt;"%. A portion of the net periodic benefit cost is capitalized within the Consolidated Balance /fontfont style="font-family:Times New Roman;font-size:10pt;"Sheets./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 13px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 269px; text-align:left; border-color:#000000;min-width:269px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 99px; text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Other /font/tdtd style="width: 70px; text-align:center;border-color:#000000;min- width:70px;"#160;/td/trtr style="height: 13px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 269px; text-align:left;border-color:#000000;min-width:269px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;" mp;#160;/tdtd colspan="5" style="width: 99px; text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Postretirement/font/tdtd style="width: 70px; text-align:center;border-color:#000000;min-width:70px;"#160;/td/trtr style="height: 13px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 269px; text-align:left;border-color:#000000;min-width:269px;"#160;/tdtd colspan="5" style="width: 99px; text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Pension Benefits/font/tdtd style=" width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 99px; 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text-align:left;border-color:#000000;min-width:70px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The following amounts were included in capital additions and operating and maintenance expense during the/fontfont style="font-family:Times New Roman;font-size:10pt;" three/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-fam ily:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;", for Generation's, ComEd's, PECO's and /fontfont style="font-family:Times New Roman;font-size:10pt;"BSC's/fontfont style="font-family:Times New Roman;font-size:10pt;" allocated portion of the pension and postretirement benefit plans: /font/pp style='margin-top:0pt; 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text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:50px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2009/font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px" ;td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd colspan="2" style="width: 336px; text-align:left;border-color:#000000;min-width:336px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Generation/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 67/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$ ;/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 60/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd colspan="2" style="width: 336px; text-align:left;border-color:#000000;min-width:336px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"ComEd/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 53/font/tdtd style="width: 5px; text-align :left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 48/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd colspan="2" style="width: 336px; text-align:left;border-color:#000000;min-width:336px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"PECO/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px ;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 12/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 12/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd colspan="2" style="width: 336px; text-align:left;border-color:#000000;min-width:336px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"BSC/font/tdtd style="width: 12px; text-align :center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 12/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 12/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 7px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#16 0;/tdtd style="width: 303px; text-align:left;border-color:#000000;min-width:303px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:center;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:center;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 7px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/ tdtd style="width: 303px; text-align:left;border-color:#000000;min-width:303px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Exelon expects/font lt;font style="font-family:Times New Roman;font-size:10pt;" to contribute approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"921/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million to the benefit plans in 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", of which /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation, ComEd and PECO expect to contribute $/fontfont style="font-family:Times New Roman;font-size:10pt;"430/fontfont style="font-family:Times New Roman;font-size:10pt;" million, $/fontfont style="font-family:Times New Roman;font-size:10pt;"305/fontfont style="font-family:Times New Roman;font-size:10pt;" million and $/fontfont style=" font-family:Times New Roman;font-size:10pt;"94/fontfont style="font-family:Times New Roman;font-size:10pt;" million, respectively. /fontfont style="font-family:Times New Roman;font-size:10pt;"These amounts include an expected incremental contribution /fontfont style="font-family:Times New Roman;font-size:10pt;"to Exelon's largest pension plan /fontfont style="font-family:Times New Roman;font-size:10pt;"of approximately $500 million above /fontfont style="font-family:Times New Roman;font-size:10pt;"the expectation/fontfont style="font-family:Times New Roman;font-size:10pt;" at /fontfont style="font-family:Times New Roman;font-size:10pt;"December/fontfont style="font-family:Times New Roman;font-size:10pt;" 31, 2009. This incremental contribution is subject to continuing evaluatio/fontfont style="font-family:Times New Roman;font-size:10pt;"n of business or market changes/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"approvals by the Registrants' respective board/fontfont style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;" of directors/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Plan Assets/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Investment Strategy. /fontfont s tyle="font-family:Times New Roman;font-size:10pt;"On a quarterly basis, Exelon reviews its actual allocations and follows a rebalancing procedure in order to /fontfont style="font-family:Times New Roman;font-size:10pt;"remain/fontfont style="font-family:Times New Roman;font-size:10pt;" within an allowable range, as defined by its policy, of its targeted asset allocation percentages. Exelon evaluates its investment strategy in coordination with the/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"funded status of its pension and other postretirement benefit plans to meet its objective of achieving optimal asset returns /fontfont style="font-family:Times New Roman;font-size:10pt;"within acceptable levels of risk /fontfont style="font-family:Times New Roman;font-size:10pt;"while balancing the liquidity requirements of the plans' liabilities . As part of this ongoing evaluat/fontfont style="font-family:Times New Roman;font-size:10pt;"ion, Exelon may make changes to /fontfont style="font-family:Times New Roman;font-size:10pt;"its targeted asset allocation and investment strategy. A change in the overall investment strategy could significantly impact the expected rate of return on plan assets./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Securities Lending Programs. /fontfont style="font-family:Times New Roman;font-size:10pt;"The majority of the benefit plans participate in a securities lending program with the trustees of the plans' investment trusts. The program authorizes the trustee of the particular trust to lend securi ties, which are assets of the plan, to approved borrowers. The trustees require borrowers, pursuant to a security lending agreement, to deliver collateral to secure each loan. The loaned securities are required to be collateralized by cash, U.S. Government securities or irrevocable bank letters of credit. Initial collateral levels are no less than 102% and 105% of the market value of the borrowed securities for collateral denominated in /fontfont style="font-family:Times New Roman;font-size:10pt;"U.S./fontfont style="font-family:Times New Roman;font-size:10pt;" and foreign currency, respectively. Subsequent collateral levels, which are adjusted daily, must be maintained at a level no less than 100% of the market value of borrowed securities. Cash collateral received is invested in collateral funds comprised primarily of short term investment vehicles. Collateral may not be sold or re-pledged by the trustees, however, the borrowers may sell or re-pledge the loaned securities. E xelon's benefit plans bear the risk of loss with respect to unfavorable changes in the fair value of the invested cash collateral. Such losses may result from a decline in the fair value of specific investments or due to liquidity impairments resulting from current market conditions. Exelon, the trustees and the borrowers have the right to terminate the lending agreement at any time. In the event of termination, the borrowers must return the loaned securities or surrender the collateral. Losses recognized by the trust were /fontfont style="font-family:Times New Roman;font-size:10pt;"not material during/fontfont style="font-family:Times New Roman;font-size:10pt;" the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" months/fontfont style="font-family:Times New Roman;font-size:10pt;" ended March 31, 2010 and 2009. Management continues to monitor the perfo rmance of the invested collateral and work closely with the trustees to limit any potential losses/fontfont style="font-family:Times New Roman;font-size:10pt;". /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;" #160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon /fontfont style="font-family:Times New Roman;font-size:10pt;"has /fontfont style="font-family:Times New Roman;font-size:10pt;"decided to end its participation in the securities lending program and /fontfont style="font-family:Times New Roman;font-size:10pt;"has initiated a /fontfont style="font-family:Times New Roman;font-size:10pt;"gradual withdrawal of the trusts' investments in order to minimize potential losses due to liquidity/fontfont style="font-family:Times New Roman;font-size:10pt;" constraints/fontfont style="font-family:Times New Roman;font-size:10pt;" in the market. /fontfont style="font-family:Times New Roman;font-size:10pt;"Currently, the weighted average maturity of the securities within the col/fontfont style="font-family:Times New Roman;font-size:10pt;"lateral funds is approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"3.5/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"months. /fontfont style="font-family:Times New Roman;font-size:10pt;"The fair value of securities on loan was approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$298 million/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"and /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"356/fontfont style="font-family:Times New Roman;font-size:10pt;" million /fontfont style="font-family:Times New Roman;font-size:10pt;"at March 31, 2010 and December 31, 2009, respectively. The fair value of cash and non-cash collateral received for these loaned securities was /fontfont style="font-family:Times New Roman;font-size:10pt;"$305 million/fontfont style="font-family:Times New Roman;font-size:10pt;" at March 31, 2010 /fontfont style="font-family:Times New Roman;font-size:10pt;"and /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"365/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" at December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"A portion of the income generated through the investment of cash collateral is remitted to the borrowers, and the remainder is allocated between the trusts and the trustees in their capacity as security agents./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.25px;"401(k) Savings Plan /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;" gt;The Registrants participate in a 401(k) savings plan sponsored by Exelon. The plan allows employees to contribute a portion of their income in accordance with specified guidelines. The Registrants match a percentage of the employee contributions up to certain limit/fontfont style="font-family:Times New Roman;font-size:10pt;"s. The following table presents/fontfont style="font-family:Times New Roman;font-size:10pt;" the/fontfont style="font-family:Times New Roman;font-size:10pt;" cost of/fontfont style="font-family:Times New Roman;font-size:10pt;" matching contributions to the savings plans /fontfont style="font-family:Times New Roman;font-size:10pt;"for the Registrants /fontfont style="font-family:Times New Roman;font-size:10pt;"during the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" /font lt;font style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;": /font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd style="width: 28px; text-align:left;border-color:#000000;min-width:28px;"#160;/tdtd style="width: 316px; text-align:left;border-color:#000000;min-width:316px;"#160;/tdtd colspan="5" s tyle="width: 127px; text-align:center;border-color:#000000;min-width:127px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Three Months Ended/font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd style="width: 28px; text-align:left;border-color:#000000;min-width:28px;"#160;/tdtd style="width: 316px; text-align:left;border-color:#000000;min-width:316px;"#160;/tdtd colspan="5" style="width: 127px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:127px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"March 31,/font/tdt d style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Savings Plan Matching Contributions/font/tdtd colspan="2" style="width: 74px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2010/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 48px ; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:48px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2009/font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Exelon/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 62px; text-align: right;border-color:#000000;min-width:62px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"20/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"18/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;" t;font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Generation/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"11/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"9/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border - -color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"ComEd/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5/font/tdtd style="width: 90px; text-align:left;bord er-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"PECO/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/tr/table/div

Retirement Benefits (Tables)	3 Months Ended
Retirement Benefits (Tables)	Mar. 31, 2010
Retirement Benefits Tables Abstract
Net periodic benefit costs table	divtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 13px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 269px; text-align:left;border-color:#000000;min-width:269px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 35px; text-align:left;bord er-color:#000000;min-width:35px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 99px; text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Other /font/tdtd style="width: 70px; 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text-align:center;border-color:#000000;min-width:70px;"#160;/td/trtr style="height: 13px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdt d style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 269px; text-align:left;border-color:#000000;min-width:269px;"#160;/tdtd colspan="5" style="width: 99px; text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Pension Benefits/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 99px; text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Benefits/font/tdtd style="width: 70px; text-align:center;border-color:#000000;min-width:70px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;b order-color:#000000;min-width:50px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 269px; text-align:left;border-color:#000000;min-width:269px;"#160;/tdtd colspan="5" style="width: 99px; text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Three Months Ended /font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 99px; text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Three Months Ended /font/tdtd style="width: 70px; text-align:center;border-color:#000000;min-width:70px;"#160;/td/tr gt;tr style="height: 14px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 269px; text-align:left;border-color:#000000;min-width:269px;"#160;/tdtd colspan="5" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"March 31,/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="5" style="width: 99px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:99px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: ce nter;"March 31,/font/tdtd style="width: 70px; text-align:center;border-color:#000000;min-width:70px;"#160;/td/trtr style="height: 14px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 269px; text-align:left;border-color:#000000;min-width:269px;"#160;/tdtd colspan="2" style="width: 47px; 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min-width:70px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 269px; text-align:left;border-color:#000000;min-width:269px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Prior service cost (benefit)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 35px; text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"4/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160; /tdtd style="width: 35px; text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"4/font/tdtd style="width: 5px; 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text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/td gt;td style="width: 35px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"64/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 35px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"66/font/tdtd style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/td/tr/table/div
Pension and postretirement benefit costs table	divtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 13px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 303px; text-align:left;border-color:#000000;min-width:303px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd colspan="4" style="width: 117px; text-align:center;border-color:#000000;min-width:117px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Three Months Ended /font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"# 160;/td/trtr style="height: 13px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 303px; text-align:left;border-color:#000000;min-width:303px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd colspan="4" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"March 31,/font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 13px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px ;"#160;/tdtd colspan="2" style="width: 336px; text-align:left;border-color:#000000;min-width:336px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Pension and Postretirement Benefit Costs/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:50px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2010/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; border-bottom-style:solid;border-bottom-width:1px;text-align:center ;border-color:#000000;min-width:50px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2009/font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd colspan="2" style="width: 336px; text-align:left;border-color:#000000;min-width:336px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Generation/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;C OLOR: #000000;" 67/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 60/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd colspan="2" style="width: 336px; text-align:left;border-color:#000000;min-width:336px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"ComEd/font/td ;td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 53/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 48/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd colspan="2" style="width: 336px; text-align:l eft;border-color:#000000;min-width:336px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"PECO/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 12/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 12/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td s tyle="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd colspan="2" style="width: 336px; text-align:left;border-color:#000000;min-width:336px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"BSC/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 12/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 12/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 7px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 303px; text-align:left;border-color:#000000;min-width:303px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:center;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:center;border-color:#000000;min-width:50px;"#160;/tdtd style= "width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 7px"td style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/tdtd style="width: 303px; text-align:left;border-color:#000000;min-width:303px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/tr/table/div
Savings plan matching contributions table	divtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd style="width: 28px; text-align:left;border-color:#000000;min-width:28px;"#160;/tdtd style="width: 316px; text-align:left;border-color:#000000;min-width:316px;"#160;/tdtd colspan="5" style="width: 127px; text-align:center;border-color:#000000;min-width:127px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Three Months Ended/font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width: 92px;"#160;/tdtd style="width: 28px; text-align:left;border-color:#000000;min-width:28px;"#160;/tdtd style="width: 316px; text-align:left;border-color:#000000;min-width:316px;"#160;/tdtd colspan="5" style="width: 127px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:127px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"March 31,/font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #0 00000;"Savings Plan Matching Contributions/font/tdtd colspan="2" style="width: 74px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2010/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 48px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:48px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2009/font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style= "width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Exelon/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"20/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/td td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"18/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Generation/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"11/font/tdtd style="width: 5px; text-align:left;border-c olor:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"9/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"ComEd/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"fon t style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"5/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 92px; text-align:left;border-color:#000000;min-width:92px;"#160;/tdtd colspan="2" style="width: 344px; text-align:left;border-color:#000000;min-width:344px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"PECO/font/tdtd style="width: 12px; text-align:left;border-c olor:#000000;min-width:12px;"#160;/tdtd style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 36px; text-align:right;border-color:#000000;min-width:36px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/tr/table/div

Retirement Benefits (Details) - USD ($)	3 Months Ended
Retirement Benefits (Details) - USD ($)	Mar. 31, 2010	Mar. 31, 2009	Dec. 31, 2009
Valuation adjustment impact [Abstract]
Accumulated other comprehensive loss (increase) decrease due to an updated valuation adjustment	$ (18,000,000)	$ 28,000,000
Collateral for borrowed securities [Abstract]
Percentage of collateral for borrowed securities in domestic currency	10200.00%
Percentage of collateral for borrowed securities in foreign currency	10500.00%
Percentage of collateral for borrowed securities required levels	10000.00%
Fair value of securities on loan	$ 298,000,000		$ 356,000,000
Fair value of cash and non-cash collateral received for loan securities	$ 305,000,000		$ 365,000,000
Weighted average maturity of the securities within the collateral funds	#160;3.5
Savings Plan Matching Contributions [Abstract]
Savings Plan Matching Contributions	$ 20,000,000	18,000,000
Expected defined benefit plan contributions [Abstract]
Expected defined benefit plan contributions	921,000,000
Expected discretionary defined benefit plan contribution	500,000,000
Pension Plan [Member]
Valuation adjustment impact [Abstract]
Obligation increase (decrease) due to an updated valuation adjustment	$ 13,000,000
Long-term rate of return on plan assets [Abstract]
Long-term rate of return on plan assets	850.00%
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]
Service cost	$ 47,000,000	44,000,000
Interest cost	165,000,000	163,000,000
Expected return on assets	(200,000,000)	(194,000,000)
Transition obligation	0	0
Prior service cost (benefit)	4,000,000	4,000,000
Actuarial loss	64,000,000	49,000,000
Net periodic benefit cost	80,000,000	66,000,000
Other postretirement benefit plan [Member]
Valuation adjustment impact [Abstract]
Obligation increase (decrease) due to an updated valuation adjustment	$ (18,000,000)
Long-term rate of return on plan assets [Abstract]
Long-term rate of return on plan assets	783.00%
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]
Service cost	$ 31,000,000	28,000,000
Interest cost	54,000,000	52,000,000
Expected return on assets	(27,000,000)	(24,000,000)
Transition obligation	2,000,000	2,000,000
Prior service cost (benefit)	(14,000,000)	(14,000,000)
Actuarial loss	18,000,000	22,000,000
Net periodic benefit cost	64,000,000	66,000,000
EXELON GENERATION CO LLC
Pension and Postretirement Benefit Costs [Abstract]
Pension and Postretirement Benefit Costs	67,000,000	60,000,000
Savings Plan Matching Contributions [Abstract]
Savings Plan Matching Contributions	11,000,000	9,000,000
Expected defined benefit plan contributions [Abstract]
Expected defined benefit plan contributions	430,000,000
COMMONWEALTH EDISON CO
Pension and Postretirement Benefit Costs [Abstract]
Pension and Postretirement Benefit Costs	53,000,000	48,000,000
Savings Plan Matching Contributions [Abstract]
Savings Plan Matching Contributions	5,000,000	5,000,000
Expected defined benefit plan contributions [Abstract]
Expected defined benefit plan contributions	305,000,000
PECO ENERGY CO
Pension and Postretirement Benefit Costs [Abstract]
Pension and Postretirement Benefit Costs	12,000,000	12,000,000
Savings Plan Matching Contributions [Abstract]
Savings Plan Matching Contributions	2,000,000	2,000,000
Expected defined benefit plan contributions [Abstract]
Expected defined benefit plan contributions	94,000,000
BUSINESS SERVICES COMPANY
Pension and Postretirement Benefit Costs [Abstract]
Pension and Postretirement Benefit Costs	$ 12,000,000	$ 12,000,000

Corporate Restructuring and Plant Retirements	3 Months Ended
Corporate Restructuring and Plant Retirements	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Corporate Restructuring and Plant Retirements (Exelon, Generation, ComEd and PECO)	p style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"8. /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Corporate Restructuring and Plant Retirements/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;" (Exelon, Generation, ComEd and PECO) /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:27.35px;"The Registrants provide severance and health and welfare benefits to terminated employees primarily based upon each individual employee's years of service and compensation level. The Registrants accrue amounts associated with severance benefits that are considered probable and tha/fontfont style="font-family:Times New Roman;font-size:10pt;"t can be reasonably estimated./font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Arial;font-size:10pt;margin-left:0px;"#160;#160;#160;#160;#160;#160;#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:27.35px;"Corporate restructuring (Exelon, Generation, ComEd and PECO). /fontfont style="font-family:Times New Roman;font-size:10pt;"On June 18, 2009, Exelon announced a restructured senior executive team and major spending cuts, including the elimination of approximately 500 /fontfont style="font-family:Times New Roman;font- size:10pt;"employee /fontfont style="font-family:Times New Roman;font-size:10pt;"positions. Exelon eliminated approximately 400 corporate support positions, mostly located at corporate headquarters, and 100 management level positions at ComEd, the majority of which was completed by September 30, 2009. These actions were in response to the continuing economic challenges confronting all parts of Exelon's business and industry especially in light of the commodity-driven nature of Generation's markets, necessitating continued focus on cost management through enhanced efficiency and productivity. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:27.35px;"Exelon recorded a pre-tax charge for estimated salary continuance and health and welfare severance benefits of $40 million in June 2009 as a result of the planned job reduct ions. Subsequent to June, Exelon recorded a net pre-tax credit of approximately $6 million, which included a $10 million reduction in estimated salary continuance and health and welfare severance benefits, offset by $4 million of expense for contractual termination benefits./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Cash payments under the plan began in July 2009 and will continue through 2010. Substantially all cash payments are expected to be made by the end of 2010 resulting in the completion of the corporate restructuring plan./fontfont style="font-family:Times New Roman;font-size:10pt;" No severance-related expenses associated with the corporate restructuring were recorded during the three months ended March 31, 2009./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style ="font-family:Times New Roman;font-size:10pt;margin-left:27.35px;"The following table presents the activity of severance obligations for/fontfont style="font-family:Times New Roman;font-size:10pt;" the /fontfont style="font-family:Times New Roman;font-size:10pt;"corporate restructuring/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"from /fontfont style="font-family:Times New Roman;font-size:10pt;"December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" through /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", excluding obligations recorded in equity:/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;' t;/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 25px"td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Severance Benefits Obligation/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:60px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Generation/font/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160 ;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:60px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"ComEd/font/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:60px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"PECO/font/tdtd style="width: 10px; text-align:left;border-color:# 000000;min-width:10px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:60px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Other/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:60px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Exelon/font/td/trtr style ="height: 20px"td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Balance at December 31, 2009/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 60px; text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 3/font/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 60px; text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 7/font/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 60px; text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 1/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/td td style="width: 60px; text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 8/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 60px; text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 19/font/td/trtr style="height: 17px"td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Cash payments/font/tdtd style="width: 10px; text-align:left;border-col or:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" (1)/font/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" (2)/font/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; text-align: right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" (1)/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" (1)/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" (5)/font/td/trtr style="height: 5px"td style="width: 19px; text-align:left;border-color:#000000;min-width:19px;"#160;/tdtd style="width: 205px; text-align:left;border-color:#000000;min-width:205px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:60px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width: 60px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:60px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:60px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-botto m-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:60px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Balance at March 31, 2010/font/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 60px; border-top-style :solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 2/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 60px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 5/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width :10px;"#160;/tdtd style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 60px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" -/font/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$ lt;/font/tdtd style="width: 60px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 7/font/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 60px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:60px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 14/font/td /tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:36px;"Plant Retirements (Exelon and Generation). /fontfont style="font-family:Times New Roman;font-size:10pt;"On December 2, 2009, Exelon announced its intention to permanently retire three coal-fired generating units and one oil/gas-fired generating unit, /fontfont style="font-family:Times New Roman;font-size:10pt;"effective May 31, 2011. The/fontfont style="font-family:Times New Roman;font-size:10pt;" units to be retired are Cromby /fontfont style="font-family:Times New Roman;font-size:10pt;"Generating Station/fontfont style="font-family:Times New Roman;font-size:10pt;" (Cromby)/fontfont style="font-family:Times New Roman;font-size:10pt;" Unit 1 and Unit 2 /fontfont style="font-family:Times New Roman;font-size:10pt;"and Eddystone Generating Station /fontfont style="font-family:Times New Roman;font-size:10pt;"(Eddystone) /fontfont style="font-family:Times New Roman;font-size:10pt;"Unit 1 and Unit 2./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"On February 1/fontfont style="font-family:Times New Roman;font-size:10pt;", 2010, /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation notified PJM that to the extent the retirement of these units results in reliability impacts, Generation would continue operations beyond its desired deactivation date during the period of construction of the necessary transmission upgrades, provided that Exelon receives the required environmental permits and adequate cost-based compensation. On March#160;2, 2010, PJM#160;determined that transmission reliability upgrades will need to be completed to alleviate reliability impacts in order to allow Generation to retire the units on the following schedule: Cromby Unit 1 and Eddystone Unit 1 on May 31, 2011; Cromby Unit 2 on May 31, 2012, and; Eddystone Unit 2 on December 31, 2013./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"These dates are dependent upon the completion of /fontfont style="font-family:Times New Roman;font-size:10pt;"required /fontfont style="font-family:Times New Roman;font-size:10pt;"transmiss/fontfont style="font-family:Times New Roman;font-size:10pt;"ion reliability upgrades and may be/fontfont style="font-family:Times New Roman;font-size:10pt;" subject to change. /fontfont style="font-family:Times New R oman;font-size:10pt;"During the first quarter of 2010 /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation /fontfont style="font-family:Times New Roman;font-size:10pt;"revised/fontfont style="font-family:Times New Roman;font-size:10pt;" the depreciable useful lives for these impacted units./fontfont style="font-family:Times New Roman;font-size:10pt;" During the second quarter of 2010, Generation expects to file with FERC a reliability-must-run agreement/fontfont style="font-family:Times New Roman;font-size:10pt;" with PJM/fontfont style="font-family:Times New Roman;font-size:10pt;" pursuant to which /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation would/fontfont style="font-family:Times New Roman;font-size:10pt;" recover the cost of operating the units during the periods /fontfont style="font-family:Times New Roman;font-size :10pt;"after May 31, 2011 /fontfont style="font-family:Times New Roman;font-size:10pt;"in which they/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"are needed to meet system reliability./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"In connection/fontfont style="font-family:Times New Roman;font-size:10pt;" with these retirements, Exelon will eliminate approximately 280 /fontfont style="font-family:Times New Roman;font-size:10pt;"employee /fontfont style="font-family:Times New Roman;font-size:10pt;"positions, /fontfont style="font-family:Times New Roman;font-size:10pt;"the majority of which are/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"located at the units to be retired. These actions were in response to the economic outlook related to the continued operation of these four units. /fontfont style="font-family:Times New Roman;font-size:10pt;"Total expected cost/fontfont style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"for Generation /fontfont style="font-family:Times New Roman;font-size:10pt;"related to /fontfont style="font-family:Times New Roman;font-size:10pt;"the announced retirements is $38 million, which includes $16/fontfont style="font-family:Times New Roman;font-size:10pt;" million for estimated salary continuance and health and welfare severance benefits, a $17 million write down of inventory and $5 million of shut down costs./fontfont style="font-family: Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Cash payments under this plan/fontfont style="font-family:Times New Roman;font-size:10pt;" bega/fontfont style="font-family:Times New Roman;font-size:10pt;"n in /fontfont style="font-family:Times New Roman;font-size:10pt;"January /fontfont style="font-family:Times New Roman;font-size:10pt;"2010 and will continue through 2014. /fontfont style="font-family:Times New Roman;font-size:10pt;"Additionally, /fontfont style="font-family:Times New Roman;font-size:10pt;"approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$180/fontfont style="font-family:Times New Roman;font-size:10pt;" million of accelerated depreciation expense will be recorded ratably until the plant shutdown date/fontfont style="font-family:Times New Roman;font-size:10pt;" ;s/fontfont style="font-family:Times New Roman;font-size:10pt;". /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"During /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;", Generation/fontfont style="font-family:Times New Roman;font-size:10pt;" recorded a pre-tax charge of $24 million related to the announced retirements, which included a $7 million charge for estimated salary continuance and health and welfare severance benefits, and $17 million of expense for the write down of inventory recorded within operating and maintenance expense in Exelon and Generation's Consolidated Statement/fontfont style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font- family:Times New Roman;font-size:10pt;" of /fontfont style="font-family:Times New Roman;font-size:10pt;"Operations./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Additionally, during 2009, Generation recorded $32 million of accelerated depreciation expense within depreciation and amortization expense in Exelon's and Generation's Consolidated Statements of Operations. /fontfont style="font-family:Times New Roman;font-size:10pt;" During th/fontfont style="font-family:Times New Roman;font-size:10pt;"e three /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", Generation /fontfont style="font-family:Times New Roman;font-size:10pt;"reco rded a pre-tax credit of $2/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" for a reduction /fontfont style="font-family:Times New Roman;font-size:10pt;"in /fontfont style="font-family:Times New Roman;font-size:10pt;"estimated salary continuance and health and welfare severance benefits/fontfont style="font-family:Times New Roman;font-size:10pt;", and /fontfont style="font-family:Times New Roman;font-size:10pt;"$15/fontfont style="font-family:Times New Roman;font-size:10pt;" million of accelerated depreciation expense./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:27.35px;"The following table presents the activity of severance obligations for the a nnounced /fontfont style="font-family:Times New Roman;font-size:10pt;"Cromby and Eddystone retirements/fontfont style="font-family:Times New Roman;font-size:10pt;" in December of 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" from /fontfont style="font-family:Times New Roman;font-size:10pt;"December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" through /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;":/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 25px"td colspan="2" style="width: 520px; text-align:left;border-color:#000000;min-width:520px;"font style ="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Severance Benefits Obligation/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 16px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 73px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:73px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon and Generation/font/td/trtr style="height: 17px"td colspan="2" style="width: 520px; text-align:left;border-color:#000000;min-width:520px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Balance at December 31, 2009/font/td td style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 73px; text-align:right;border-color:#000000;min-width:73px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 7/font/td/trtr style="height: 17px"td colspan="2" style="width: 520px; text-align:left;border-color:#000000;min-width:520px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Other adjustments/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 73px; text-al ign:right;border-color:#000000;min-width:73px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" (2)/font/td/trtr style="height: 6px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 500px; text-align:left;border-color:#000000;min-width:500px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 16px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 73px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:73px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 520px; 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Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Income Taxes (Exelon, Generation, ComEd and PECO)	p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"9.#160;#160;#160;#160;Income Taxes (Exelon, Generation, ComEd and PECO) /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:12pt;margin-left:0px;"#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"The effective income tax rate from continuing operations varies from the U.S. Federal statutory rate principally due to the following:/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="heig ht: 17px"td colspan="2" style="width: 369px; text-align:left;border-color:#000000;min-width:369px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"For the Three Months Ended March 31, 2010/font/tdtd colspan="2" style="width: 58px; 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text-align:left;border-color:#000000;min-width:18px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 40px; text-align :left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 18px; text-align:left;border-color:#000000;min-width:18px;"#160;/td/trtr style="height: 17px"td colspan="2" style="width: 369px; text-align:left;border-color:#000000;min-width:369px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"U.S. Federal statutory rate/font/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 35.0/font/tdtd style="width: 18px; text-align:center;border-color:#000000;min-width:18px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"%/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 40px; text-align:right;border-color:# 000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 35.0/font/tdtd style="width: 18px; text-align:center;border-color:#000000;min-width:18px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"%/font/tdtd style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 35.0/font/tdtd style="width: 18px; text-align:center;border-color:#000000;min-width:18px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"%/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 40px; text-align:right;border- color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 35.0/font/tdtd style="width: 18px; text-align:center;border-color:#000000;min-width:18px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"%/font/td/trtr style="height: 17px"td colspan="2" style="width: 369px; text-align:left;border-color:#000000;min-width:369px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Increase (decrease) due to:/font/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 18px; text-align:left;border-color:#000000;min-width:18px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-widt h:40px;"#160;/tdtd style="width: 18px; text-align:left;border-color:#000000;min-width:18px;"#160;/tdtd style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 18px; text-align:left;border-color:#000000;min-width:18px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 18px; 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margin-bottom: 0pt;'/ pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:12.25px;"Accounting for Uncertainty in Income Taxes /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Exelon, Generation, ComEd and PECO have $/fontfont style="font-family:Times New Roman;font-size:10pt;"1.42 /fontfont style="font-family:Times New Roman;font-size:10pt;"billion, $/fontfont style="font-family:Times New Roman;font-size:10pt;"625/fontfont style="font-family:Times New Roman;font-size:10pt;" million, $/fontfont style="font-family:Times New Roman;font-size:10pt;"401/fontfont style="font-family:Times New Roman;font-size:10pt;" million and $/fontfont style="font-family:Times New Roman;font-size:10pt;"371/fontfont style="font- family:Times New Roman;font-size:10pt;" million, respectively, of unrecognized tax benefits as of March 31, 2010. Exelon's, Generation's, ComEd's and PECO's uncertain tax positions have not significantly changed since December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;" See Note 10 of the /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;" Form 10-K for a discussion of reasonably possible changes that could occur in our unrecognized tax benefits during the next twelve months. The following /fontfont style="font-family:Times New Roman;font-size:10pt;"is/fontfont style="font-family:Times New Roman;font-size:10pt;" an update to that discussion/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp sty le='margin-top:4.5pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Illinois Replacement Investment Tax Credits (Exelon, Generation and ComEd) /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"On February#160;20, 2009, the Illinois Supreme Court ruled in Exelon's favor in a case involving refund claims for Illinois investment tax credits.#160; Responding to the Illinois Attorney General's petition for rehearing, on July#160;15, 2009, the Illinois Supreme Court modified its opinion to indicate that it was to be applied only prospectively, beginning in 2009. In Septe mber 2009, the Illinois Supreme Court denied Exelon's Petition for Rehearing. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"On December#160;22, 2009, Exelon filed a Petition of Writ for Certiorari with the United States Supreme Court appealing the Illinois Supreme Court's July#160;15, 2009 modified opinion. As a result of the filing of the United States Supreme Court petition, unrecognized tax benefits continued to be reported as of December 31, 2009. /fontfont style="font-family:Times New Roman;font-size:10pt;"On March 1, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" the United States Supreme Cou rt announced that it would not review the Illinois Supreme Court's decision. As a result of the United States Supreme Court decision, Exelon, Generation/fontfont style="font-family:Times New Roman;font-size:10pt;" and ComEd ceased reporting/fontfont style="font-family:Times New Roman;font-size:10pt;" their unrecognized tax benefits as of March 31, 2010. /font/pp style='margin-top:4.5pt; margin-bottom:0pt'#160;/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:9px;"Other /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Income /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Tax Matters/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Ti mes New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.45px;"1999 Sale of Fossil Generating Assets (Exelon and ComEd) /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Exelon, through its ComEd subsidiary, took two positions on its 1999 income tax return to defer approximately $2.8 billion of tax gain on the 1999 sale of ComEd's fossil generating assets. Exelon deferred approximately $1.6 billion of the gain under the involuntary conversion provisions of the IRC. Exelon believes that it was economically compelled to dispose of ComEd's fossil generating plants as a result of the Illinois Act. The proceeds from the sale of the fossil plants were properly reinvested in qualifying replacement property such that the ga in was deferred over the lives of the replacement property under the involuntary conversion provisions. Approximately $1.2 billion of the gain was deferred by reinvesting the proceeds from the sale in qualifying replacement property under the like-kind exchange provisions of the IRC. The like-kind exchange replacement property purchased by Exelon included interests in three municipal-owned electric generation facilities which were properly leased back to the municipalities. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Exelon received the IRS audit report for 1999 through 2001, which reflected the full disallowance of the deferral of gain associated with both the involuntary conversion position and the like-kind exchange transaction. Spe cifically, the IRS has asserted that ComEd was not forced to sell the fossil generating plants and the sales proceeds were therefore not received in connection with an involuntary conversion of certain ComEd property rights. Accordingly, the IRS has asserted that the gain on the sale of the assets was fully subject to tax. The IRS also asserted that the Exelon purchase and leaseback transaction is substantially similar to a leasing transaction, known as a SILO, which the IRS does not respect as the acquisition of an ownership interest in property. A SILO is a "listed transaction" that the IRS has identified as a potentially abusive tax shelter under guidance issued in 2005. Accordingly, the IRS has asserted that the sale of the fossil plants followed by the purchase and leaseback of the municipal owned generation facilities does not qualify as a like-kind exchange and the gain on the sale is fully subject to tax. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-f amily:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In addition to attempting to impose tax on the transactions, the IRS has asserted penalties of approximately $196 million for a substantial understatement of tax. Because Exelon believes it is unlikely that the penalty assertion will ultimately be sustained, Exelon and ComEd have not recorded a liability for penalties. However, should the IRS prevail in asserting the penalty it would result in an after-tax charge of $196 million to Exelon's and ComEd's results of operations. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px; "Exelon disagrees with the IRS disallowance of the deferral of gain and specifically with the characterization of its purchase and leaseback as a SILO. Exelon has been in discussions with IRS Appeals for several months in an attempt to reach a settlement on both the involuntary conversion and like-kind exchange, in a manner commensurate with Exelon's and the IRS' respective hazards of litigation with respect to each issue. During 2009, Exelon determined that a settlement with IRS Appeals was unlikely and that Exelon would be required to initiate litigation in order to resolve the issues. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Due to the fact that tax litigation often results in a negotiated settlement, Exelon believes that an eventual settlement on the involuntary conversion position remains a likely outcome. Exelon and ComEd have established a liability for an unrecognized tax benefit consistent with their view as to a likely settlement. Management has considered the progress of the ongoing discussions with IRS Appeals and determined that there were no new developments during the /fontfont style="font-family:Times New Roman;font-size:10pt;"first quarter of 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" that require a remeasurement of the amounts recorded. Based on management's expectations as to the ongoing potential of a settlement, it is reasonably possible that the unrecognized tax benefits related to this issue may significantly increase or decrease within the next 12 months. It is not possible at this time to predict the amount, if any, of such a change. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;fon t-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"With regard to the like-kind exchange transaction, Exelon does not currently believe it is possible to reach a negotiated settlement with either IRS Appeals or the Government's lawyers prior to a trial. While Exelon has been and remains willing to settle the issue in a manner generally commensurate with its hazards of litigation, the IRS has indicated that it will only settle the issue in a manner consistent with published settlement guidelines for SILO transactions. Those guidelines require a nearly complete concession of the issue by Exelon. Exelon does not believe that its transaction is the same as or substantially similar to a SILO and does not believe that the concession demanded by the IRS reflects the strength of Exelon's position. Accordingly, Exelon currently believes it is likely that the issue will be fully litigated. Given that Exelon has determined settlement is no longer a realistic outcome, it has assessed in accordance with accounting standards whether it will prevail in litigation. While Exelon recognizes the complexity and hazards of this litigation, it believes that it is more likely than not that it will prevail in such litigation and has therefore eliminated any liability for unrecognized tax benefits. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"A fully successful IRS challenge to Exelon's and ComEd's involuntary conversion position and like-kind exchange transaction would accelerate income tax payments and increase interest expense related to the deferred tax gain that becomes currently payable. As of /font font style="font-family:Times New Roman;font-size:10pt;"March/fontfont style="font-family:Times New Roman;font-size:10pt;"#160;31, 20/fontfont style="font-family:Times New Roman;font-size:10pt;"10/fontfont style="font-family:Times New Roman;font-size:10pt;", Exelon's and ComEd's potential tax and interest that could become currently payable in the event of a successful IRS challenge could be as much as $1.1 billion. Any payments ultimately determined to be due to the IRS related to the involuntary conversion position and the like-kind exchange transaction would be partially offset by the approximately $300 million refund due from the settlement of the 2001 tax method of accounting change for certain overhead costs under the SSCM. A favorable settlement of the tax position related to the CTCs (discussed below) for the 1999-2001 years could also offset a portion of any tax liability due with respect to the final outcome on these positions. If the IRS wer e to prevail in litigation on both tax positions, Exelon's and ComEd's results of operations could be negatively affected by as much as $300 million (after-tax) related to interest expense. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.45px;"Competitive Transition Charges (Exelon, ComEd and PECO) /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Exelon contends that the Illinois Act and the Competition Act resulted in the taking of certain of ComEd's and PECO's assets used in their respective businesses of providing electricity servi ces in their defined service areas. Exelon has filed refund claims with the IRS taking the position that CTCs collected during ComEd's and PECO's transition periods represent compensation for that taking and, accordingly, are excludible from taxable income as proceeds from an involuntary conversion. If Exelon is successful in its claims, it will be required to reduce the tax basis of property acquired with the funds provided by the CTCs such that the benefits of the position are temporary in nature. The IRS has disallowed the refund claims for the 1999-2001 tax years. Exelon has protested the disallowance and is currently discussing the refund claims with IRS Appeals. The years 2002-2006 are currently under IRS audit and Exelon expects the claims for those years to be disallowed/fontfont style="font-family:Times New Roman;font-size:10pt;" when filed/fontfont style="font-family:Times New Roman;font-size:10pt;". /font/pp style='margin-top:0pt; margin-bottom:0 pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Under the Illinois Act, ComEd was required to allow competitors the use of its distribution system resulting in the taking of ComEd's assets and lost asset value (stranded costs). As compensation for the taking, ComEd was permitted to collect a portion of the stranded costs through the collection of CTCs from those customers electing to purchase electricity from providers other than ComEd. ComEd collected approximately $1.2 billion in CTCs for the years 1999-2006. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;m argin-left:24.5px;"Similarly, under the Competition Act, PECO was required to allow others the use of its distribution system resulting in the taking of PECO's assets and the stranded costs. Pennsylvania permitted PECO to collect CTCs as compensation for its stranded costs. The PAPUC determined the total amount of stranded costs that PECO was permitted to collect through the CTCs to be $5.3 billion. PECO has collected approximately $4./fontfont style="font-family:Times New Roman;font-size:10pt;"6/fontfont style="font-family:Times New Roman;font-size:10pt;" billion in CTCs for the period 2000 through /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;". PECO will continue billing CTCs through 2010. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"#160 ;/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"ComEd and PECO have recognized tax benefits associated with the CTC refund claims and have accrued interest on this tax position. Exelon's, ComEd's and PECO's management believe that the issue has been appropriately recognized; however, the ultimate outcome of this matter could result in unfavorable or favorable impacts to the results of operations and financial positions as well as potential favorable impacts to cash flows, and such impacts could be material. Management has#160;considered the progress of this matter before IRS Appeals and determined that#160;there#160;are no new developments that#160;lead to a remeasurement of the amounts recorded. Based on management's expectations as to the length of the appeal, it is reasonably possible that the unrecognized tax benefits related to this issue may significantly increase or decreas e within the next 12 months. It is not possible at this time to predict the amount, if any, of such a change. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Health/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"C/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"are Reform Legislation/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"(Exelon, Generation, ComEd and PECO)/font/p p style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The Patient Protection and Affordable Care Act, as modified by the Health Care and Education Reconciliation Act, was enacted/fontfont style="font-family:Times New Roman;font-size:10pt;" into law in March 2010/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon sponsors a health plan that provides /fontfont style="font-family:Times New Roman;font-size:10pt;"prescription drug /fontfont style="font-family:Times New Roman;font-size:10pt;"benefits to retiree participants.#160; Because the benefits provided are at least actuarially equivalent to benefits available to retirees under /fontfont style="font-family:Times New Roman;font-size:10pt ;"the Prescription Drug Act/fontfont style="font-family:Times New Roman;font-size:10pt;", Exelon qualifies for and receives /fontfont style="font-family:Times New Roman;font-size:10pt;"F/fontfont style="font-family:Times New Roman;font-size:10pt;"ederal subsidies that mitigate the cost of the plan. Historically, the subsidies have not been subject to tax/fontfont style="font-family:Times New Roman;font-size:10pt;" and Exelon has been able/fontfont style="font-family:Times New Roman;font-size:10pt;" to take a tax deduction for its/fontfont style="font-family:Times New Roman;font-size:10pt;" retiree health/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"care costs/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size :10pt;"The /fontfont style="font-family:Times New Roman;font-size:10pt;"new /fontfont style="font-family:Times New Roman;font-size:10pt;"health/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"care legislation includes a provision that reduces the deductibility, for /fontfont style="font-family:Times New Roman;font-size:10pt;"F/fontfont style="font-family:Times New Roman;font-size:10pt;"ederal income tax purposes, of /fontfont style="font-family:Times New Roman;font-size:10pt;"the /fontfont style="font-family:Times New Roman;font-size:10pt;"retiree health/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"care costs to the extent an employer's postretirement health/fontfont style="font-family:T imes New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"care plan receives/fontfont style="font-family:Times New Roman;font-size:10pt;" these/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"F/fontfont style="font-family:Times New Roman;font-size:10pt;"ederal subsidies.#160; Although this change does not take effect immediately, /fontfont style="font-family:Times New Roman;font-size:10pt;"the Registrants/fontfont style="font-family:Times New Roman;font-size:10pt;" are required to recognize the full accounting impact in their financial statements in the p/fontfont style="font-family:Times New Roman;font-size:10pt;"eriod in which the legislation wa/fontfont style="font-family:Times New Roman;font-size:10pt;"s /fontfont style="font-family:Ti mes New Roman;font-size:10pt;"enacted/fontfont style="font-family:Times New Roman;font-size:10pt;". As a result, in the first quarter of 2010, Exelon /fontfont style="font-family:Times New Roman;font-size:10pt;"recorded a charge (after-tax)/fontfont style="font-family:Times New Roman;font-size:10pt;" of approximately $65 million /fontfont style="font-family:Times New Roman;font-size:10pt;"to/fontfont style="font-family:Times New Roman;font-size:10pt;" income tax expense /fontfont style="font-family:Times New Roman;font-size:10pt;"to reverse deferred tax assets previously established/fontfont style="font-family:Times New Roman;font-size:10pt;". Of this total, Generation, ComEd and PECO /fontfont style="font-family:Times New Roman;font-size:10pt;"recorded/fontfont style="font-family:Times New Roman;font-size:10pt;" charges of $24 million, $11 million /font ;font style="font-family:Times New Roman;font-size:10pt;"and $9 million, respectively.#160; /font/p

Nuclear Decommissioning	3 Months Ended
Nuclear Decommissioning	Mar. 31, 2010
Statement [Line Items]
Nuclear Decommissioning (Exelon and Generation)	p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"10/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;". /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Nuclear Decommissioning/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;" (Exelon/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;" and/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Generation)/font/pp style='margin-top :4.4pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:2.2px;"Nuclear Decommissioning As/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"set Retirement Obligations/font/pp style='margin-top:4.4pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:23.1px;"Generation has a legal obligation to decommission its nuclear power plants following the expiration of their operating licenses. The following table provides a rollforward of the nuclear decommissioning ARO reflected on Exelon's and Generation's Consolida/fontfont style="font-family:Times New Roman;font-size:10pt;"ted Balance Sheets/fontfont style="font-family:Times New Roman;font-size:10pt;" from December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" to /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;": /font/pp style='margin-top:4.4pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"#160;/tdtd style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 100px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:100px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon and Generation /font/td/trtr style="he ight: 17px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Nuclear decommissioning ARO at December 31, 2009 (a)/font/tdtd style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 100px; text-align:right;border-color:#000000;min-width:100px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3,260/font/td/trtr style="height: 17px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Accretion expense/font/tdtd style="width: 9px; text-align:center;border-color:#000000;min-width:9p x;"#160;/tdtd style="width: 100px; text-align:right;border-color:#000000;min-width:100px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"48/font/td/trtr style="height: 17px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Costs incurred to decommission retired plants/font/tdtd style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 100px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:100px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(3)/font/td/trtr style="height: 7px"td style="width: 100px; text-align:left;border-color:#000 000;min-width:100px;"#160;/tdtd style="width: 416px; text-align:left;border-color:#000000;min-width:416px;"#160;/tdtd style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 100px; text-align:center;border-color:#000000;min-width:100px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Nuclear decommissioning ARO at March 31, 2010 (a)/font/tdtd style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:9px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 100px; border-bottom-style:double;border-bottom-width:3px;text-align:r ight;border-color:#000000;min-width:100px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3,305/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"__________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(a) /fontfont style="font-family:Times New Roman;font-size:10pt;"#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Includes /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;" ;17 million /fontfont style="font-family:Times New Roman;font-size:10pt;"as the current portion of the ARO at March 31, 2010 and December /fontfont style="font-family:Times New Roman;font-size:10pt;"31, 2009,/fontfont style="font-family:Times New Roman;font-size:10pt;" which is included in other current liabilities on Exelon's and Generation's Consolidated Balance Sheets./font/pp style='margin-top:14.3pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:2.2px;"Nuclear Decommissioning Trust#160;Fund#160;Investments/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"Generation will pay for its respective obligations using trust funds that have been established for this purpose. ;/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"At March 31, 2010 and December 31, 2009, Exelon and Generation had NDT fund investments /fontfont style="font-family:Times New Roman;font-size:10pt;"totaling $/fontfont style="font-family:Times New Roman;font-size:10pt;"6/fontfont style="font-family:Times New Roman;font-size:10pt;",885/fontfont style="font-family:Times New Roman;font-size:10pt;" million an/fontfont style="font-family:Times New Roman;font-size:10pt;"d $6,669 million, respectively. /fontfont style="font-family:Times New Roman;font-size:10pt;"The following table provides unrealized /fontfont style="font-family:Times New Roman;font-size:10pt;"gains (/fontfont style="font-family:Times New Roman;font-size:10pt;"losses/fontfont style="font-family:Times New Roma n;font-size:10pt;")/fontfont style="font-family:Times New Roman;font-size:10pt;" on /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT funds for the three /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;":/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;border-color:#000000;min-width:469px;"#160 ;/tdtd colspan="5" style="width: 136px; text-align:center;border-color:#000000;min-width:136px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon and Generation/font/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;border-color:#000000;min-width:469px;"#160;/tdtd colspan="5" style="width: 136px; text-align:center;border-color:#000000;min-width:136px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Three Months Ended/font/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;border-color:#000000;min-width: 469px;"#160;/tdtd colspan="5" style="width: 136px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:136px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"March 31,/font/td/trtr style="height: 17px"td colspan="2" style="width: 489px; text-align:left;border-color:#000000;min-width:489px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:50px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2010/font/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;" t;#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:50px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2009/font/td/trtr style="height: 17px"td colspan="2" style="width: 489px; text-align:left;border-color:#000000;min-width:489px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Net unrealized gains (losses) on decommissioning trust funds /font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 12px; text-al ign:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;border-color:#000000;min-width:469px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Regulatory Agreement Units (a)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR : #000000;"111/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(168)/font/td/trtr style="height: 17px"td colspan="2" style="width: 489px; text-align:left;border-color:#000000;min-width:489px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Net unrealized gains (losses) on decommissioning trust funds /font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;bord er-color:#000000;min-width:50px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;border-color:#000000;min-width:469px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Non-Regulatory Agreement Units (b)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000 000;"35/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(64)/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"__________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(a)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Gains and losses related to lt;/fontfont style="font-family:Times New Roman;font-size:10pt;"Generation's /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT/fontfont style="font-family:Times New Roman;font-size:10pt;" funds associated with /fontfont style="font-family:Times New Roman;font-size:10pt;"Regulatory Agreement Units/fontfont style="font-family:Times New Roman;font-size:10pt;" are /fontfont style="font-family:Times New Roman;font-size:10pt;"included in regulatory liabilities on Exelon's Consolidated Balance Sheets and noncurrent payables to affiliates on Generation's Consolidated Balance Sheets./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(b)#160;#160;#160;#160;#160;#160;#160;/fontfont style="f ont-family:Times New Roman;font-size:10pt;"Gains and losses related to /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation's /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT/fontfont style="font-family:Times New Roman;font-size:10pt;" funds /fontfont style="font-family:Times New Roman;font-size:10pt;"associated with Non-Regulatory Agreement Units/fontfont style="font-family:Times New Roman;font-size:10pt;" are included within other, net in Exelon's and Generation's Consolidated Statements of Operations and Comprehensive Income./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:11.2pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Interest and dividends on /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT/fontfont styl e="font-family:Times New Roman;font-size:10pt;" fund investments are recogniz/fontfont style="font-family:Times New Roman;font-size:10pt;"ed when/fontfont style="font-family:Times New Roman;font-size:10pt;" earned and included in Other, net in Exelon/fontfont style="font-family:Times New Roman;font-size:10pt;" and Generation's Consolidated Statements of Operations./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Interest and dividends earned on the /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT/fontfont style="font-family:Times New Roman;font-size:10pt;" fund investments for the /fontfont style="font-family:Times New Roman;font-size:10pt;"Regulatory Agreement Units/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"are eliminated within Other, net in Exelon and Generation's Consolidated Statements of Operations./font/pp style='margin-top:11.2pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Refer to /fontfont style="font-family:Times New Roman;font-size:10pt;"Note 3 #8211; /fontfont style="font-family:Times New Roman;font-size:10pt;"Regulatory Matters/fontfont style="font-family:Times New Roman;font-size:10pt;" for information regarding regulatory liabilities at ComEd and PECO and intercompany balances between Generation, ComEd and PECO reflecting the obligation to refund the customers any decommissioning-related assets in excess of the related decommissioning obligations./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin - -top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:23.1px;"Securities Lending Program. /fontfont style="font-family:Times New Roman;font-size:10pt;" Generation's NDT funds participate in a securities lending program with the trustees of the funds. The program authorizes the trustees to loan securities that are assets of the trust funds to approved borrowers. The trustees require borrowers, pursuant to a security lending agreement, to deliver collateral to secure each loan. The securities are required to be collateralized by cash, U.S. Government securities or irrevocable bank letters of credit. Initial collateral levels are no less than 102% and 105% of the market value of the borrowed securities for collateral denominated in /fontfont style="font-family:Times New Roman;font-size:10pt;"U.S./fontfont style="font-family:Times New Roman;font-size:10pt;" and foreign currency, respectively. Su bsequent collateral levels, which are adjusted daily, must be maintained at a level no less than 100% of the market value of borrowed securities. Cash collateral received is primarily invested in a short-term collateral fund, but may also be invested in assets with maturities matching, or approximating, the duration of the loan of the related securities. Collateral may not be sold or re-pledged by the trustees; however, the borrowers may sell or re-pledge the securities loaned. Generation bears the risk of loss with respect to its invested cash collateral. Such losses may result from a decline in fair value of specific investments or liquidity impairments resulting from current market conditions. Generation, the trustees and the borrowers have the right to terminate the lending agreement at their discretion, upon which borrowers would return securities to Generation in exchange for their cash collateral. If the short-term collateral funds do not have adequate liquidity, Generation may incur losses upon the withdrawal of amounts from the funds to repay the borrowers' collateral. Losses recognized by Generation, whether the result of declines in fair value or liquidity impairments, have not been significant to date. Management continues to monitor the performance of the invested collateral and to work closely with the trustees to limit any potential further losses. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:23.1px;"Generation/fontfont style="font-family:Times New Roman;font-size:10pt;" has decided to end its participation in the securities lending program and has initiated a gradual withdrawal of the trusts' investments in order to minimize potential losses due to liquidity/fontfont style="font-family:Times New Roman;font-size:10pt;" constraints/fontfont style="font-family:Times New Roman;font- size:10pt;" in the market./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Currently, the weighted average maturity of the securities within the collateral pools is approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"3.5 /fontfont style="font-family:Times New Roman;font-size:10pt;"months./fontfont style="font-family:Times New Roman;font-size:10pt;" The fair value of securities on loan was /fontfont style="font-family:Times New Roman;font-size:10pt;"approximately $285/fontfont style="font-family:Times New Roman;font-size:10pt;" million and /fontfont style="font-family:Times New Roman;font-size:10pt;"$357/fontfont style="font-family:Times New Roman;font-size:10pt;" million at March 31, 2010 and December 31, 2009, respectively. The fair value of cash and non-cash coll ateral received for these loaned securities was $290 million at March 31, 2010 and $366 million at December 31, 2009./font/pp style='margin-top:9.9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:23.1px;"A portion of the income generated through the investment of cash collateral is remitted to the borrowers, and the remainder is allocated between the trust funds and the trustees in their capacity as security agents. Securities lending income allocated to the NDT funds is included in NDT fund earnings and classified as Other, net in Exelon's and Generation's Consolidated Statements of Operations and was not significant during the three months ended March 31, 2010 and 2009./font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:23.1px;"NRC Minimum Funding Requirements/fontfont style="font-family:Times New Roman;font-si ze:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"NRC regulations require that licensees of nuclear generating facilities demonstrate reasonable assurance that funds will be available in specified minimum amounts at the end of the life of the facility to decommission the /fontfont style="font-family:Times New Roman;font-size:10pt;"facility. On/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"March 10/fontfont style="font-family:Times New Roman;font-size:10pt;", 2010/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" Generat/fontfont style="font-family:Times New Roman;font-size:10pt;"ion notified the NRC that it had/fontfont style="font-family:Times New Roman;font-size:10pt;" remediated the December 31, 2009 underfunded position of its/fontfont style="font-family:Times New Roman;font-size:10pt;" Byron and Braidwood/fontfont style="font-family:Times New Roman;font-size:10pt;" N/fontfont style="font-family:Times New Roman;font-size:10pt;"DT funds/fontfont style="font-family:Times New Roman;font-size:10pt;" with the establishment of approximately $44 million in parent guarantees/fontfont style="font-family:Times New Roman;font-size:10pt;" in accordance with the/fontfont style="font-family:Times New Roman;font-size:10pt;" plan submitted/fontfont style="font-family:Times New Roman;font-size:10pt;" to the NRC/fontfont style="font-family:Times New Roman;font-size:10pt;" on July 31, 2009. /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation is awaiting final NRC approval/fontfont style="font-family:Times New Roman;font-size:10pt;". See Note 11 of the 2009 Form 10-K for further information on NRC minimum funding requirements./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:36px;"Accounting Implications of the Regulatory Agreements with PECO and ComEd. /fontfont style="font-family:Times New Roman;font-size:10pt;"Based on the regulatory agreement supported by the PAPUC that dictates Generation's rights and obligations related to the shortfall or excess of trust funds necessary for decommissioning the seven former PECO nuclear units, regardless of whether the funds held in the NDT funds exceed or fall short of the total estimated decommissioning obligation, decommissioning-related activities are generally offset within Exelon's and Generation's Consolidated Statements of Operations. The offset of decommissioning-related activities within the Consolidated Statement of Operations results in an equal adjustment to the noncurrent payables to affiliates at Generation and an adjustment to the regulatory liabilities at Exelon. Likewise, PECO has recorded an equal noncurrent affiliate receivable from Generation and a corresponding regulatory liability. Any changes to the PECO regulatory agreements could impact Exelon's and Generation's ability to offset decommissioning-related activities within the /fontfont style="font-family:Times New Roman;font-size:10pt;"Consolidated Statement of Operations, and the impact to Exelon's and Generation's results of operations and financial position could be material. See Note /fontfont style="font-family:Times New Roman;font-size:10pt;"3/fontfont style="font-family:Times New Roman;font-size:10pt;"#8212;Regulatory Issues for information regarding the ALJ's Recommended Decision concluding that /fontfont style="font-family:Times New Roman;font-size:10pt;"the NDCAC/fontfont style="font-family:Times New Roman; font-size:10pt;" should continue after the termination of PECO's /fontfont style="font-family:Times New Roman;font-size:10pt;"CTC/fontfont style="font-family:Times New Roman;font-size:10pt;" collections on December 31, 2010. The Recommended Decision is not expected to materially impact Exelon or Generation's future resul/fontfont style="font-family:Times New Roman;font-size:10pt;"ts of operations, cash flows or/fontfont style="font-family:Times New Roman;font-size:10pt;" financial position./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"#160;#160;#160;#160;#160;#160;#160;See Note 11 of the 2009 Form 10-K for information regarding accounting implications of the regulatory agreement with ComEd for nuclear decommission/font font style="font-family:Times New Roman;font-size:10pt;"ing/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top:11.2pt; margin-bottom:0pt'#160;/p
EXELON GENERATION CO LLC
Statement [Line Items]
Nuclear Decommissioning (Exelon and Generation)	p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"10/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;". /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Nuclear Decommissioning/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;" (Exelon/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;" and/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;" /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Generation)/font/ pp style='margin-top:4.4pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:2.2px;"Nuclear Decommissioning As/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"set Retirement Obligations/font/pp style='margin-top:4.4pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:23.1px;"Generation has a legal obligation to decommission its nuclear power plants following the expiration of their operating licenses. The following table provides a rollforward of the nuclear decommissioning ARO reflected on Exelon's and Generation's Consolida/fontfont style="font-family:Times New Roman;font-size:10pt;"ted Balance Sheets/fontfont style="font-family:Times New Roman;font-size:10pt;" from December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" t; to /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;": /font/pp style='margin-top:4.4pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"#160;/tdtd style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 100px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:100px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon and Generation /font/td ;/trtr style="height: 17px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Nuclear decommissioning ARO at December 31, 2009 (a)/font/tdtd style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 100px; text-align:right;border-color:#000000;min-width:100px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3,260/font/td/trtr style="height: 17px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Accretion expense/font/tdtd style="width: 9px; text-align:center;borde r-color:#000000;min-width:9px;"#160;/tdtd style="width: 100px; text-align:right;border-color:#000000;min-width:100px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"48/font/td/trtr style="height: 17px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Costs incurred to decommission retired plants/font/tdtd style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 100px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:100px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(3)/font/td/trtr style="height: 7px"td style="width: 100px; text- align:left;border-color:#000000;min-width:100px;"#160;/tdtd style="width: 416px; text-align:left;border-color:#000000;min-width:416px;"#160;/tdtd style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"#160;/tdtd style="width: 100px; text-align:center;border-color:#000000;min-width:100px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 516px; text-align:left;border-color:#000000;min-width:516px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Nuclear decommissioning ARO at March 31, 2010 (a)/font/tdtd style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:9px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 100px; border-bottom-style:double;border-b ottom-width:3px;text-align:right;border-color:#000000;min-width:100px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3,305/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"__________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(a) /fontfont style="font-family:Times New Roman;font-size:10pt;"#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Includes /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times N ew Roman;font-size:10pt;"17 million /fontfont style="font-family:Times New Roman;font-size:10pt;"as the current portion of the ARO at March 31, 2010 and December /fontfont style="font-family:Times New Roman;font-size:10pt;"31, 2009,/fontfont style="font-family:Times New Roman;font-size:10pt;" which is included in other current liabilities on Exelon's and Generation's Consolidated Balance Sheets./font/pp style='margin-top:14.3pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:2.2px;"Nuclear Decommissioning Trust#160;Fund#160;Investments/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"Generation will pay for its respective obligations using trust funds that have been estab lished for this purpose. /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"At March 31, 2010 and December 31, 2009, Exelon and Generation had NDT fund investments /fontfont style="font-family:Times New Roman;font-size:10pt;"totaling $/fontfont style="font-family:Times New Roman;font-size:10pt;"6/fontfont style="font-family:Times New Roman;font-size:10pt;",885/fontfont style="font-family:Times New Roman;font-size:10pt;" million an/fontfont style="font-family:Times New Roman;font-size:10pt;"d $6,669 million, respectively. /fontfont style="font-family:Times New Roman;font-size:10pt;"The following table provides unrealized /fontfont style="font-family:Times New Roman;font-size:10pt;"gains (/fontfont style="font-family:Times New Roman;font-size:10pt;"losses/fontfont style ="font-family:Times New Roman;font-size:10pt;")/fontfont style="font-family:Times New Roman;font-size:10pt;" on /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT funds for the three /fontfont style="font-family:Times New Roman;font-size:10pt;"months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;":/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;border-color:#000000;mi n-width:469px;"#160;/tdtd colspan="5" style="width: 136px; text-align:center;border-color:#000000;min-width:136px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon and Generation/font/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;border-color:#000000;min-width:469px;"#160;/tdtd colspan="5" style="width: 136px; text-align:center;border-color:#000000;min-width:136px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Three Months Ended/font/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;bor der-color:#000000;min-width:469px;"#160;/tdtd colspan="5" style="width: 136px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:136px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"March 31,/font/td/trtr style="height: 17px"td colspan="2" style="width: 489px; text-align:left;border-color:#000000;min-width:489px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:50px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2010/font/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-colo r:#000000;min-width:12px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:50px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2009/font/td/trtr style="height: 17px"td colspan="2" style="width: 489px; text-align:left;border-color:#000000;min-width:489px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Net unrealized gains (losses) on decommissioning trust funds /font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;border-color:#000000;min-width:469px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Regulatory Agreement Units (a)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"111/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(168)/font/td/trtr style="height: 17px"td colspan="2" style="width: 489px; text-align:left;border-color:#000000;min-width:489px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Net unrealized gains (losses) on decommissioning trust funds /font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width : 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 469px; text-align:left;border-color:#000000;min-width:469px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Non-Regulatory Agreement Units (b)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman ;FONT-SIZE: 10pt;COLOR: #000000;"35/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 50px; text-align:right;border-color:#000000;min-width:50px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(64)/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"__________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(a)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"G ains and losses related to /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation's /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT/fontfont style="font-family:Times New Roman;font-size:10pt;" funds associated with /fontfont style="font-family:Times New Roman;font-size:10pt;"Regulatory Agreement Units/fontfont style="font-family:Times New Roman;font-size:10pt;" are /fontfont style="font-family:Times New Roman;font-size:10pt;"included in regulatory liabilities on Exelon's Consolidated Balance Sheets and noncurrent payables to affiliates on Generation's Consolidated Balance Sheets./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(b)#160;#160;#160;#160;#160;#160;#160; t;/fontfont style="font-family:Times New Roman;font-size:10pt;"Gains and losses related to /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation's /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT/fontfont style="font-family:Times New Roman;font-size:10pt;" funds /fontfont style="font-family:Times New Roman;font-size:10pt;"associated with Non-Regulatory Agreement Units/fontfont style="font-family:Times New Roman;font-size:10pt;" are included within other, net in Exelon's and Generation's Consolidated Statements of Operations and Comprehensive Income./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:11.2pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Interest and dividends on /fontfont style="font-family:Times New Roman;font-size:10pt;"N DT/fontfont style="font-family:Times New Roman;font-size:10pt;" fund investments are recogniz/fontfont style="font-family:Times New Roman;font-size:10pt;"ed when/fontfont style="font-family:Times New Roman;font-size:10pt;" earned and included in Other, net in Exelon/fontfont style="font-family:Times New Roman;font-size:10pt;" and Generation's Consolidated Statements of Operations./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Interest and dividends earned on the /fontfont style="font-family:Times New Roman;font-size:10pt;"NDT/fontfont style="font-family:Times New Roman;font-size:10pt;" fund investments for the /fontfont style="font-family:Times New Roman;font-size:10pt;"Regulatory Agreement Units/fontfo nt style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"are eliminated within Other, net in Exelon and Generation's Consolidated Statements of Operations./font/pp style='margin-top:11.2pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Refer to /fontfont style="font-family:Times New Roman;font-size:10pt;"Note 3 #8211; /fontfont style="font-family:Times New Roman;font-size:10pt;"Regulatory Matters/fontfont style="font-family:Times New Roman;font-size:10pt;" for information regarding regulatory liabilities at ComEd and PECO and intercompany balances between Generation, ComEd and PECO reflecting the obligation to refund the customers any decommissioning-related assets in excess of the related decommissioning obligations./font/pp style='margin-top:0pt; margin-bottom:0pt'#160; lt;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:23.1px;"Securities Lending Program. /fontfont style="font-family:Times New Roman;font-size:10pt;" Generation's NDT funds participate in a securities lending program with the trustees of the funds. The program authorizes the trustees to loan securities that are assets of the trust funds to approved borrowers. The trustees require borrowers, pursuant to a security lending agreement, to deliver collateral to secure each loan. The securities are required to be collateralized by cash, U.S. Government securities or irrevocable bank letters of credit. Initial collateral levels are no less than 102% and 105% of the market value of the borrowed securities for collateral denominated in /fontfont style="font-family:Times New Roman;font-size:10pt;"U.S./fontfont style="font-family:Times New Roman;font-size:10pt;" and foreig n currency, respectively. Subsequent collateral levels, which are adjusted daily, must be maintained at a level no less than 100% of the market value of borrowed securities. Cash collateral received is primarily invested in a short-term collateral fund, but may also be invested in assets with maturities matching, or approximating, the duration of the loan of the related securities. Collateral may not be sold or re-pledged by the trustees; however, the borrowers may sell or re-pledge the securities loaned. Generation bears the risk of loss with respect to its invested cash collateral. Such losses may result from a decline in fair value of specific investments or liquidity impairments resulting from current market conditions. Generation, the trustees and the borrowers have the right to terminate the lending agreement at their discretion, upon which borrowers would return securities to Generation in exchange for their cash collateral. If the short-term collateral funds do not have adequate liquidity, Generatio n may incur losses upon the withdrawal of amounts from the funds to repay the borrowers' collateral. Losses recognized by Generation, whether the result of declines in fair value or liquidity impairments, have not been significant to date. Management continues to monitor the performance of the invested collateral and to work closely with the trustees to limit any potential further losses. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:23.1px;"Generation/fontfont style="font-family:Times New Roman;font-size:10pt;" has decided to end its participation in the securities lending program and has initiated a gradual withdrawal of the trusts' investments in order to minimize potential losses due to liquidity/fontfont style="font-family:Times New Roman;font-size:10pt;" constraints/fontfont style="font- family:Times New Roman;font-size:10pt;" in the market./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Currently, the weighted average maturity of the securities within the collateral pools is approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"3.5 /fontfont style="font-family:Times New Roman;font-size:10pt;"months./fontfont style="font-family:Times New Roman;font-size:10pt;" The fair value of securities on loan was /fontfont style="font-family:Times New Roman;font-size:10pt;"approximately $285/fontfont style="font-family:Times New Roman;font-size:10pt;" million and /fontfont style="font-family:Times New Roman;font-size:10pt;"$357/fontfont style="font-family:Times New Roman;font-size:10pt;" million at March 31, 2010 and December 31, 2009, respectively. The fair val ue of cash and non-cash collateral received for these loaned securities was $290 million at March 31, 2010 and $366 million at December 31, 2009./font/pp style='margin-top:9.9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:23.1px;"A portion of the income generated through the investment of cash collateral is remitted to the borrowers, and the remainder is allocated between the trust funds and the trustees in their capacity as security agents. Securities lending income allocated to the NDT funds is included in NDT fund earnings and classified as Other, net in Exelon's and Generation's Consolidated Statements of Operations and was not significant during the three months ended March 31, 2010 and 2009./font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:23.1px;"NRC Minimum Funding Requirements/fontfont style="font-fa mily:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"NRC regulations require that licensees of nuclear generating facilities demonstrate reasonable assurance that funds will be available in specified minimum amounts at the end of the life of the facility to decommission the /fontfont style="font-family:Times New Roman;font-size:10pt;"facility. On/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"March 10/fontfont style="font-family:Times New Roman;font-size:10pt;", 2010/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" Generat/fontfont style="font-family:Times New Roman;font-size:10pt;"ion notified the NRC that it had/fontfont style="font-family:Times New Roman;font-size:10pt;" remediated the December 31, 2009 underfunded position of its/fontfont style="font-family:Times New Roman;font-size:10pt;" Byron and Braidwood/fontfont style="font-family:Times New Roman;font-size:10pt;" N/fontfont style="font-family:Times New Roman;font-size:10pt;"DT funds/fontfont style="font-family:Times New Roman;font-size:10pt;" with the establishment of approximately $44 million in parent guarantees/fontfont style="font-family:Times New Roman;font-size:10pt;" in accordance with the/fontfont style="font-family:Times New Roman;font-size:10pt;" plan submitted/fontfont style="font-family:Times New Roman;font-size:10pt;" to the NRC/fontfont style="font-family:Times New Roman;font-size:10pt;" on July 31, 2009. /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation is awaiting final NRC approval/fontfont style="font-family:Times New R oman;font-size:10pt;". See Note 11 of the 2009 Form 10-K for further information on NRC minimum funding requirements./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:36px;"Accounting Implications of the Regulatory Agreements with PECO and ComEd. /fontfont style="font-family:Times New Roman;font-size:10pt;"Based on the regulatory agreement supported by the PAPUC that dictates Generation's rights and obligations related to the shortfall or excess of trust funds necessary for decommissioning the seven former PECO nuclear units, regardless of whether the funds held in the NDT funds exceed or fall short of the total estimated decommissioning obligation, decommissioning-related activities are generally offset within Exelon's and Generation's Consolidated Statements of Operations. The offset of decommissioning-related activities within the Consolidated Statement of Operations re sults in an equal adjustment to the noncurrent payables to affiliates at Generation and an adjustment to the regulatory liabilities at Exelon. Likewise, PECO has recorded an equal noncurrent affiliate receivable from Generation and a corresponding regulatory liability. Any changes to the PECO regulatory agreements could impact Exelon's and Generation's ability to offset decommissioning-related activities within the /fontfont style="font-family:Times New Roman;font-size:10pt;"Consolidated Statement of Operations, and the impact to Exelon's and Generation's results of operations and financial position could be material. See Note /fontfont style="font-family:Times New Roman;font-size:10pt;"3/fontfont style="font-family:Times New Roman;font-size:10pt;"#8212;Regulatory Issues for information regarding the ALJ's Recommended Decision concluding that /fontfont style="font-family:Times New Roman;font-size:10pt;"the NDCAC/fontfont style=" font-family:Times New Roman;font-size:10pt;" should continue after the termination of PECO's /fontfont style="font-family:Times New Roman;font-size:10pt;"CTC/fontfont style="font-family:Times New Roman;font-size:10pt;" collections on December 31, 2010. The Recommended Decision is not expected to materially impact Exelon or Generation's future resul/fontfont style="font-family:Times New Roman;font-size:10pt;"ts of operations, cash flows or/fontfont style="font-family:Times New Roman;font-size:10pt;" financial position./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"#160;#160;#160;#160;#160;#160;#160;See Note 11 of the 2009 Form 10-K for information regarding accounting implications of the regulatory agreement with ComEd for nuclear d ecommission/fontfont style="font-family:Times New Roman;font-size:10pt;"ing/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top:11.2pt; margin-bottom:0pt'#160;/p

Earnings Per Share and Equity	3 Months Ended
Earnings Per Share and Equity	Mar. 31, 2010
Earnings Per Share and Equity (Exelon) [Line Items]
Earnings Per Share and Equity (Exelon)	p style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:16.85pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"11/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;". /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;"Earnings Per Share and Equity (Exelon) /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Earnings per Share /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"Diluted earnings per share is calculate d by dividing net income by the weighted average number of shares of common stock outstanding, including shares to be issued upon exercise of stock options, performance share awards and restricted stock outstanding under Exelon's long-term incentive plans considered to be common stock equivalents. The following table sets forth the components of basic and diluted earnings per share and shows the effect of these stock options, performance share awards and restricted stock on the weighted average number of shares outstanding used in calculating diluted earnings per share:/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 29px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 453px; text-align:left;border-color:#000000;min-width:453px;"#160;/tdtd colspan="5" style="width: 147px ; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:147px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"ThreeMonthsEnded March 31,/font/td/trtr style="height: 17px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 453px; text-align:left;border-color:#000000;min-width:453px;"#160;/tdtd colspan="2" style="width: 71px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:71px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2010/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 71px; border-top-style:solid;border-top-width:1px;tex t-align:center;border-color:#000000;min-width:71px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2009/font/td/trtr style="height: 18px"td colspan="2" style="width: 478px; text-align:left;border-color:#000000;min-width:478px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Net income/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 55px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"749/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width : 16px; text-align:left;border-color:#000000;min-width:16px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 55px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"712/font/td/trtr style="height: 7px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 453px; text-align:left;border-color:#000000;min-width:453px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:center;border-color:#000000;min-width:55px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16p x; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:center;border-color:#000000;min-width:55px;"#160;/td/trtr style="height: 17px"td colspan="2" style="width: 478px; text-align:left;border-color:#000000;min-width:478px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Average common shares outstanding- basic/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"661/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text - -align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"659/font/td/trtr style="height: 17px"td colspan="2" style="width: 478px; text-align:left;border-color:#000000;min-width:478px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Assumed exercise of stock options, performance share awards and restricted stock/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px ;"#160;/tdtd style="width: 55px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2/font/td/trtr style="height: 7px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 453px; text-align:left;border-color:#000000;min-width:453px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:center;border-color:#000000;min-width:55px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:center;border-color:#00000 0;min-width:55px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 478px; text-align:left;border-color:#000000;min-width:478px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Average common shares outstanding- diluted/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"662/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width :55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"661/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The number of stock options not included in the calculation of diluted common shares outstanding due to their antidil/fontfont style="font-family:Times New Roman;font-size:10pt;"utive effect was /fontfont style="font-family:Times New Roman;font-size:10pt;"approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"6/fontfont style="font-family:Times New Roman;font-size:10pt;"#160;million and 5/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million /fontfont sty le="font-family:Times New Roman;font-size:10pt;"for the three months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;", respectively. /font/pp style='margin-top:11.2pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"U/fontfont style="font-family:Times New Roman;font-size:10pt;"nder share repurchase /fontfont style="font-family:Times New Roman;font-size:10pt;"programs,/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"35/fo ntfont style="font-family:Times New Roman;font-size:10pt;"#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"million shares of common stock are held as treasury stock with a cost of /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"2.3/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"billion as of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"In 2008, Exelon management decided to defer indefinitely any share repurchases. /fontfont style="font-family:Times New Roman;fon t-size:10pt;" /font/p

Earnings Per Share and Equity (Tables)	3 Months Ended
Earnings Per Share and Equity (Tables)	Mar. 31, 2010
Earnings Per Share And Equity Tables Abstract
Basic and diluted earnings per share (Exelon)	divtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 29px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 453px; text-align:left;border-color:#000000;min-width:453px;"#160;/tdtd colspan="5" style="width: 147px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:147px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"ThreeMonthsEnded March 31,/font/td/trtr style="height: 17px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 453px; text-align:left;border-color:#000000;min-width:453px;"#160;/td t;td colspan="2" style="width: 71px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:71px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2010/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 71px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:71px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"2009/font/td/trtr style="height: 18px"td colspan="2" style="width: 478px; text-align:left;border-color:#000000;min-width:478px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Net income/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16 px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 55px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"749/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 55px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"712/font/td/trtr style="height: 7px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25p x;"#160;/tdtd style="width: 453px; text-align:left;border-color:#000000;min-width:453px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:center;border-color:#000000;min-width:55px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:center;border-color:#000000;min-width:55px;"#160;/td/trtr style="height: 17px"td colspan="2" style="width: 478px; text-align:left;border-color:#000000;min-width:478px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Average common shares outstanding- basic/font/tdtd style="width: 16px; text-align:left;border-color:#00 0000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"661/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"659/font/td/trtr style="height: 17px"td colspan="2" style="width: 478px; text-align:left;border-color:#000000;min-width:478px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Assumed exercise of stock options, performance share awards and restricted stock/font/tdtd style="width: 16px; text-align:left;bord er-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2/font/td/trtr style="height: 7px"td style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 453px; text-align:left;border-color:#000000;min-width:453px;"#160;/tdtd s tyle="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:center;border-color:#000000;min-width:55px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; text-align:center;border-color:#000000;min-width:55px;"#160;/td/trtr style="height: 18px"td colspan="2" style="width: 478px; text-align:left;border-color:#000000;min-width:478px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Average common shares outstanding- diluted/font/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; border-bottom-style:double;border-bottom-width:3px;text-align:right;bo rder-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"662/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 16px; text-align:left;border-color:#000000;min-width:16px;"#160;/tdtd style="width: 55px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:55px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"661/font/td/tr/table/div

Earnings Per Share and Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2010	Mar. 31, 2009	Dec. 31, 2009
Earnings per average common share - diluted:
Net income	$ 749	$ 712
Average common shares outstanding - basic	661	659
Assumed exercise of stock options, performance share awards and restricted stock	1	2
Average common shares outstanding - diluted	662	661
Stock options not included in the calculation of diluted common shares outstanding [Abstract]
Stock options not included in the calculation of diluted common shares outstanding	6	5
Treasury Stock [Abstract]
Treasury stock, shares held	35		35
Treasury stock, at cost	$ 2,328		$ 2,328
EXELON GENERATION CO LLC
Earnings per average common share - diluted:
Net income	561	$ 528
COMMONWEALTH EDISON CO
Earnings per average common share - diluted:
Net income	116	114
PECO ENERGY CO
Earnings per average common share - diluted:
Net income	$ 101	$ 113

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Commitments and Contingencies (Exelon, Generation, ComEd and PECO)	p style='margin-top:16.85pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"12.#160;#160;#160;#160;Commitments and Contingencies (Exelon, Generation, ComEd and PECO) /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"For information regarding capital commitments a/fontfont style="font-family:Times New Roman;font-size:10pt;"t /fontfont style="font-family:Times New Roman;font-size:10pt;"December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;", see Note 18/fontfont style="font-family:Times New Roman;font-size:10pt;" of the /fontfont style="font-family:Times New Roman;font-size:10pt;"2009 /font t;font style="font-family:Times New Roman;font-size:10pt;"Form#160;10-K. All significant contingencies are disclosed below. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Energy Commitments /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"Generation's/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"ComEd's/fontfont style="font-family:Times New Roman;font-size:10pt;" and PECO's short /fontfont style="font-family:Times New Roman;font-size:10pt;"and long/font t;font style="font-family:Times New Roman;font-size:10pt;"-term commitments relating to the /fontfont style="font-family:Times New Roman;font-size:10pt;"sale and /fontfont style="font-family:Times New Roman;font-size:10pt;"purchase /fontfont style="font-family:Times New Roman;font-size:10pt;"of energy, capacity and transmission rights as o/fontfont style="font-family:Times New Roman;font-size:10pt;"f March 31, 2010 /fontfont style="font-family:Times New Roman;font-size:10pt;"change/fontfont style="font-family:Times New Roman;font-size:10pt;"d /fontfont style="font-family:Times New Roman;font-size:10pt;"from /fontfont style="font-family:Times New Roman;font-size:10pt;"December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" as follows/fontfont style="font-family:Times New Roman;font-size:10pt;":/font/pp sty le='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;" /font/pp style='margin-top:0pt; margin-bottom:0pt'/pulli style="margin-left:36px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"Generation's total commitments for future sales of energy to thi/fontfont style="font-family:Times New Roman;font-size:10pt;"rd/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"parties /fontfont style="font-family:Times New Roman;font-size:10pt;"de/fontfont style="font-family:Times New Roman;font-size:10pt;"creased by approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"228/fontfont style="font-family:Tim es New Roman;font-size:10pt;"#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"million during the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"reflecting in/fontfont style="font-family:Times New Roman;font-size:10pt;"creases of approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"77/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"mi/fontfont style="font-f amily:Times New Roman;font-size:10pt;"llion, /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"27/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"$13/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million/fontfont style="font-family:Times New Roman;font-size:10pt;" related /fontfont style="font-family:Times New Roman;font-size:10pt;"to /fontfont style="font-family:Times New Roman;font-size:10pt;"201/fontfont style="font-family:Times New Roman;font-size:10pt;"1/font gt;font style="font-family:Times New Roman;font-size:10pt;", 201/fontfont style="font-family:Times New Roman;font-size:10pt;"2 /fontfont style="font-family:Times New Roman;font-size:10pt;"and 201/fontfont style="font-family:Times New Roman;font-size:10pt;"3/fontfont style="font-family:Times New Roman;font-size:10pt;" sales commitments, respectively, offset by the fulfillment of approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"345/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million/fontfont style="font-family:Times New Roman;font-size:10pt;" of /fontfont style="font-family:Times New Roman;font-size:10pt;"2010/fontfont style="font-family:Times New Roman;font-size:10pt;" gt; commitments during the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;". The increases /fontfont style="font-family:Times New Roman;font-size:10pt;"were primarily due to increased overall hedging activity in the normal course of business. /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"See Note 6 #8722; Derivative Financial Instruments for additional information regarding Generation's hedging program. /font/li/ulp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'/pulli style= "margin-left:36px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"Generation's total commitments for future net purchases of capacity from /fontfont style="font-family:Times New Roman;font-size:10pt;"third parties decreased by /fontfont style="font-family:Times New Roman;font-size:10pt;"$117 million during the three months ended March 31, 2010, reflecting decreases of approximately $4 million, $6 million, $5 million, $3 million and $17 mill/fontfont style="font-family:Times New Roman;font-size:10pt;"ion related to 2011, 2012, 2013, /fontfont style="font-family:Times New Roman;font-size:10pt;"2014 and beyond net purchase commitments, respectively, due to overall hedging activity in /fontfont style="font-family:Times New Roman;font-size:10pt;"the normal course of business. /fontfont style="font-family:Times New Roman;font-size:10pt;"A d/fontfont style="font-family:Ti mes New Roman;font-size:10pt;"ecrease/fontfont style="font-family:Times New Roman;font-size:10pt;" of approximately $82 million/fontfont style="font-family:Times New Roman;font-size:10pt;" was/fontfont style="font-family:Times New Roman;font-size:10pt;" due to the fulfillment of 2010 commitments during the three months ended March 31, 2010. /fontfont style="font-family:Times New Roman;font-size:10pt;"See Note /fontfont style="font-family:Times New Roman;font-size:10pt;"6 #8722; /fontfont style="font-family:Times New Roman;font-size:10pt;"Derivative Financial Instruments for additional information regarding Generation's hedging program./font/li/ulp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'/pulli style="margin-left:36px;list-style:disc;"font style="font-family:Times New Roman;fo nt-size:10pt;"Pursuant to a PPA with Public Service Company of /fontfont style="font-family:Times New Roman;font-size:10pt;"Oklahoma/fontfont style="font-family:Times New Roman;font-size:10pt;", a subsidiary of American Electric Power, dated as of April 17, 2009, Generation agreed to sell its rights to up to 520 MW, or approximately two-thirds of the capacity, energy and ancillary services supplied under its existing long-term contract with Green Country Energy, LLC. The deliver/fontfont style="font-family:Times New Roman;font-size:10pt;"y of power under the PPA is to /fontfont style="font-family:Times New Roman;font-size:10pt;"commence June 1, 2012 and/fontfont style="font-family:Times New Roman;font-size:10pt;" run through February 28, 2022./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/li/ulp style='margin-top:0pt; margin-bottom:0pt'#160;/p t;p style='margin-top:0pt; margin-bottom:0pt'/pulli style="margin-left:36px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"On December 17, 2009, Generation entered into a PPA with Entergy Texas, Inc. (ETI) to sell 150 MWs through April 30, 2011 and 300 MWs thereafter of capacity and energy from the Frontier Generating Station located in /fontfont style="font-family:Times New Roman;font-size:10pt;"Grimes County/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"Texas/fontfont style="font-family:Times New Roman;font-size:10pt;". The approximate ten year PPA is not included within /fontfont style="font-family:Times New Roman;font-size:10pt;"net capacity payment commitments/fontfont style="font-family:Times New Roman;font-size:10pt;" because it is contingent upon ETI waiving or obtainin g regulatory approvals, which may occur after the commencement of the PPA on May 1, 2010./font/li/ulp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'/pulli style="margin-left:36px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"PECO's /fontfont style="font-family:Times New Roman;font-size:10pt;"AEC purchase commitments increased#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"$21 million /fontfont style="font-family:Times New Roman;font-size:10pt;"during the three months ended March 31, 2010 as a r/fontfont style="font-family:Times New Roman;font-size:10pt;"esult of the#160;solar AEC#160;purchase /fontfont style="font-family :Times New Roman;font-size:10pt;"agreements#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"executed in March /fontfont style="font-family:Times New Roman;font-size:10pt;"2010 resulting in approximately $2 million annually over a 11/fontfont style="font-family:Times New Roman;font-size:10pt;"-/fontfont style="font-family:Times New Roman;font-size:10pt;"year period/fontfont style="font-family:Times New Roman;font-size:10pt;". See Note 3 #8212; Regulatory Matters for additional information./font/li/ulp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.25px;"Fuel /fontfont style="font-family:Times New Roman;font-size:10pt; font-weight:bold;font-style:italic;"and Natural Gas /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"Purchase Obligations /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Generation's and PECO's fuel purchase obligations as of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" change/fontfont style="font-family:Times New Roman;font-size:10pt;"d/fontfont style="font-family:Times New Roman;font-size:10pt;" from /fontfont style="font-family:Times New Roman;font-size:10pt;"December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" as follows:/fontfont style="font-family:Times New Roman;font-size:10pt;" /font/p ;p style='margin-top:5.6pt; margin-bottom:0pt'/pulli style="margin-left:42.5px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"Generation's total fuel purchase obligations for /fontfont style="font-family:Times New Roman;font-size:10pt;"nuclear and fossil generation de/fontfont style="font-family:Times New Roman;font-size:10pt;"creased by approximately $/fontfont style="font-family:Times New Roman;font-size:10pt;"504/fontfont style="font-family:Times New Roman;font-size:10pt;" million during the /fontfont style="font-family:Times New Roman;font-size:10pt;"three/fontfont style="font-family:Times New Roman;font-size:10pt;" months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", reflecting de/fontfont style="font-fam ily:Times New Roman;font-size:10pt;"creases of approximately $/fontfont style="font-family:Times New Roman;font-size:10pt;"11/fontfont style="font-family:Times New Roman;font-size:10pt;" million, $/fontfont style="font-family:Times New Roman;font-size:10pt;"36/fontfont style="font-family:Times New Roman;font-size:10pt;" million, /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"27 million, $43 /fontfont style="font-family:Times New Roman;font-size:10pt;"million /fontfont style="font-family:Times New Roman;font-size:10pt;"and $/fontfont style="font-family:Times New Roman;font-size:10pt;"114/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Ti mes New Roman;font-size:10pt;"for/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"201/fontfont style="font-family:Times New Roman;font-size:10pt;"1/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"201/fontfont style="font-family:Times New Roman;font-size:10pt;"2/fontfont style="font-family:Times New Roman;font-size:10pt;", 201/fontfont style="font-family:Times New Roman;font-size:10pt;"3/fontfont style="font-family:Times New Roman;font-size:10pt;", 201/fontfont style="font-family:Times New Roman;font-size:10pt;"4/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"and /fontfont style="font- family:Times New Roman;font-size:10pt;"beyond/fontfont style="font-family:Times New Roman;font-size:10pt;", respectively, /fontfont style="font-family:Times New Roman;font-size:10pt;"primarily /fontfont style="font-family:Times New Roman;font-size:10pt;"due to /fontfont style="font-family:Times New Roman;font-size:10pt;"change/fontfont style="font-family:Times New Roman;font-size:10pt;"s/fontfont style="font-family:Times New Roman;font-size:10pt;" in pricing of certain fuel procurement contracts. A/fontfont style="font-family:Times New Roman;font-size:10pt;"ddition/fontfont style="font-family:Times New Roman;font-size:10pt;"ally,/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"2010 commitments during the three months ended March 31, 2010/fontfont style="font-fam ily:Times New Roman;font-size:10pt;" decreased by /fontfont style="font-family:Times New Roman;font-size:10pt;"$273/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"primarily due /fontfont style="font-family:Times New Roman;font-size:10pt;"to/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"the fulfillment/fontfont style="font-family:Times New Roman;font-size:10pt;" of /fontfont style="font-family:Times New Roman;font-size:10pt;"fuel procurement contacts/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/li/ulp style ='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'/pulli style="margin-left:18px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"PECO's total /fontfont style="font-family:Times New Roman;font-size:10pt;"natural gas/fontfont style="font-family:Times New Roman;font-size:10pt;" purchase obligations /fontfont style="font-family:Times New Roman;font-size:10pt;"incre/fontfont style="font-family:Times New Roman;font-size:10pt;"ased b/fontfont style="font-family:Times New Roman;font-size:10pt;"y approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$52/fontfont style="font-family:Times New Roman;font-size:10pt;" million during the three/fontfont style="font-family:Times New Roman;font-size:10pt;" months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", reflecting /fontfont style="font-family:Times New Roman;font-size:10pt;"increases/fontfont style="font-family:Times New Roman;font-size:10pt;" of /fontfont style="font-family:Times New Roman;font-size:10pt;"$26/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million/fontfont style="font-family:Times New Roman;font-size:10pt;", $21 million, $1 million, $1 million and $ 3 million/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"in /fontfont style="font-family:Times New Roman;font-size:10pt;"2010/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-fa mily:Times New Roman;font-size:10pt;"2011/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"2012, 2013 and 2015/fontfont style="font-family:Times New Roman;font-size:10pt;" and beyond, respectively, /fontfont style="font-family:Times New Roman;font-size:10pt;"primarily related to/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"increased/fontfont style="font-family:Times New Roman;font-size:10pt;" natural gas purchase commitments made in accordance with PECO's PAPUC-approved procurement schedule/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/li/ulp style='margin-top: 0pt; margin-bottom: 0pt;'/pp s tyle='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.25px;"Commercial and Construction Commitments /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Exelon's, Generation's, ComEd's and PECO's commercial and construction commitments as of March 31, 2010, representing commitments potentially triggered by future events/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"change/fontfont style="font-family:Times New Roman;font-size:10pt;"d /fontfont style="font-family:Times New Roman;font-size:10pt;"from December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;" as follows:/fontfont style="font-family:Times New Roman;font-si ze:10pt;" /font/pp style='margin-top:4.5pt; margin-bottom:0pt'/pulli style="margin-left:36px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"Exelon's letters of credit /fontfont style="font-family:Times New Roman;font-size:10pt;"de/fontfont style="font-family:Times New Roman;font-size:10pt;"creased /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"2/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"due /fontfont style="font-family:Times New Roman;font-size:10pt;"to /fontfont style="font-family:Times New Roman;font-size:10pt;"activity at Generation, ComEd and PECO /font gt;font style="font-family:Times New Roman;font-size:10pt;"as discussed below. G/fontfont style="font-family:Times New Roman;font-size:10pt;"uarantees/fontfont style="font-family:Times New Roman;font-size:10pt;"#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"decreased by /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"34/fontfont style="font-family:Times New Roman;font-size:10pt;" million /fontfont style="font-family:Times New Roman;font-size:10pt;"predominantly /fontfont style="font-family:Times New Roman;font-size:10pt;"as a /fontfont style="font-family:Times New Roman;font-size:10pt;"result /fontfont style="font-family:Times New Roman;font-size:10pt;"of decrease/fontfont style="font-family:Times New Roman;font-size:10pt;"s/ fontfont style="font-family:Times New Roman;font-size:10pt;" in /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation/fontfont style="font-family:Times New Roman;font-size:10pt;"'s guarantees/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"as noted /fontfont style="font-family:Times New Roman;font-size:10pt;"below/fontfont style="font-family:Times New Roman;font-size:10pt;" partially offset by /fontfont style="font-family:Times New Roman;font-size:10pt;"approximately $44 million in parent guarantees/fontfont style="font-family:Times New Roman;font-size:10pt;" issued by Exelon as part of the remediation of /fontfont style="font-family:Times New Roman;font-size:10pt;"the December 31, 2009 underfunded position of /fontfont style="font-family:Times New Roma n;font-size:10pt;"Generation's/fontfont style="font-family:Times New Roman;font-size:10pt;" Byron and Braidwood NDT funds/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Guarantees decreased/fontfont style="font-family:Times New Roman;font-size:10pt;" by /fontfont style="font-family:Times New Roman;font-size:10pt;"$91/fontfont style="font-family:Times New Roman;font-size:10pt;" million for 2010, /fontfont style="font-family:Times New Roman;font-size:10pt;"increased by/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"$16/fontfont style="font-family:Times New Roman;font-size:10pt;" million for 2011 through 2012, /font t;font style="font-family:Times New Roman;font-size:10pt;"de/fontfont style="font-family:Times New Roman;font-size:10pt;"creased by $15/fontfont style="font-family:Times New Roman;font-size:10pt;" million for 2013 through 2014 and /fontfont style="font-family:Times New Roman;font-size:10pt;"in/fontfont style="font-family:Times New Roman;font-size:10pt;"creased by $56/fontfont style="font-family:Times New Roman;font-size:10pt;" million for 2015 and beyond./font/lili style="margin-left:36px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"Generation's letters of credit /fontfont style="font-family:Times New Roman;font-size:10pt;"de/fontfont style="font-family:Times New Roman;font-size:10pt;"creased /fontfont style="font-family:Times New Roman;font-size:10pt;"by $/fontfont style="font-family:Times New Roman;font-si ze:10pt;"5/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" and guarantees /fontfont style="font-family:Times New Roman;font-size:10pt;"decreased /fontfont style="font-family:Times New Roman;font-size:10pt;"by $/fontfont style="font-family:Times New Roman;font-size:10pt;"75/fontfont style="font-family:Times New Roman;font-size:10pt;" million primarily as a result of energy trading activities/fontfont style="font-family:Times New Roman;font-size:10pt;"./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/li/ulp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'/pulli style="margin-left:36px;list-style:disc;" t;font style="font-family:Times New Roman;font-size:10pt;"ComEd's letters of /fontfont style="font-family:Times New Roman;font-size:10pt;"credit /fontfont style="font-family:Times New Roman;font-size:10pt;"increased/fontfont style="font-family:Times New Roman;font-size:10pt;" by/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"10/fontfont style="font-family:Times New Roman;font-size:10pt;" million/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"due to /fontfont style="font-family:Times New Roman;font-size:10pt;"an increase/fontfont style="font-family:Times New Roman;font-size:10pt;" in the collateral requirement to PJM. ;/font/li/ulp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'/pulli style="margin-left:36px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"ComEd's PJM /fontfont style="font-family:Times New Roman;font-size:10pt;"RTEP/fontfont style="font-family:Times New Roman;font-size:10pt;" baseline project commitments decreased by $/fontfont style="font-family:Times New Roman;font-size:10pt;"7/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million /fontfont style="font-family:Times New Roman;font-size:10pt;"for /fontfont style="font-family:Times New Roman;font-size:10pt;"2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and increased by $/fontfon t style="font-family:Times New Roman;font-size:10pt;"5/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million and $3 /fontfont style="font-family:Times New Roman;font-size:10pt;"million for /fontfont style="font-family:Times New Roman;font-size:10pt;"2011/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2012/fontfont style="font-family:Times New Roman;font-size:10pt;", respectively,/fontfont style="font-family:Times New Roman;font-size:10pt;" driven by changes in estimated timing and amount of project spending./font/li/ulp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'/pulli style="margin-left:63px;list-style:disc;" font style="font-family:Times New Roman;font-size:10pt;"PECO's outstanding letters of credit decreased by /fontfont style="font-family:Times New Roman;font-size:10pt;"$8 /fontfont style="font-family:Times New Roman;font-size:10pt;"million primarily /fontfont style="font-family:Times New Roman;font-size:10pt;"due to the cancellation of a letter of credit associated with a tax credit purchase transaction that was completed in March 2010./font/li/ulp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'/pulli style="margin-left:36px;list-style:disc;"font style="font-family:Times New Roman;font-size:10pt;"PECO's PJM RTEP baseline project commitm/fontfont style="font-family:Times New Roman;font-size:10pt;"ents decreased by /fontfont style="font-family:Times New Roman;font-size:10pt;"$3/fontfont style="font-family:Times New Roman;font-size:10pt;" million /fontfont style="font-family:Times New Roman;font-size:10pt;"for 2011 and 2012/fontfont style="font-family:Times New Roman;font-size:10pt;" driven by changes in estimated timing and amount of project spending./font/li/ulp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:16.85pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Indemnifications Related to Sithe (Exelon and Generation) /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"On January#160;31, 2005, subsidiaries of Generation completed a series of transactions that resulted in Generation's sale of its investment in Sithe. Specifica lly, subsidiaries of Generation consummated the acquisition of Reservoir Capital Group's 50% interest in Sithe and subsequently sold 100% of Sithe to Dynegy, Inc. (Dynegy). /font/pp style='margin-top:5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In connection with the sale, Exelon recorded liabilities related to certain indemnifications provided to Dynegy and other guarantees directly resulting from the transaction. /fontfont style="font-family:Times New Roman;font-size:10pt;"As of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;", Exelon's accrued liabilities related to these indemnifications and guarantees /fontfont style="font-family:Times New Roman;font-size:10pt;"were $/fontfont style="font-family:Times New Roman;font-size:10pt;"6/fontfont style ="font-family:Times New Roman;font-size:10pt;"#160;million/fontfont style="font-family:Times New Roman;font-size:10pt;". The estimated maximum possible exposure to Exelon related to the guarantees provided as part of the sales transaction to Dynegy was /fontfont style="font-family:Times New Roman;font-size:10pt;"approximately $/fontfont style="font-family:Times New Roman;font-size:10pt;"200/fontfont style="font-family:Times New Roman;font-size:10pt;"#160;million at /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;". /font/pp style='margin-top:13.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Indemnifications Related to /fontfont style="font-family:Times New Roman;font-size:10pt;font-weigh t:bold;font-style:italic;"Sale/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;" of Termoel#233;ctrica del Golfo (TEG) and Termoel#233;ctrica Pe#241;oles (TEP) (Exelon and Generation) /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"On February#160;9, 2007, Tamuin International Inc. (TII), a wholly owned subsidiary of Generation, sold its 49.5% ownership interests in TEG and TEP to a subsidiary of AES Corporation for $95 million in cash plus certain purchase price adjustments. In connection with the transaction, Ge/fontfont style="font-family:Times New Roman;font-size:10pt;"neration entered into a guarant/fontfont style="font-family:Times New Roman;font-size:10pt;"ee/fontfont style="font-family:Times New Roman;font-size:10pt;" agreement under which Generation guarantee s the timely payment of TII's obligations to the subsidiary of AES Corporation pursuant to the terms of the purchase and sale agreement relating to the sale of TII's ownership interests. /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation would be required to perform in the event that TII does not pay any obligation covered by the guarant/fontfont style="font-family:Times New Roman;font-size:10pt;"ee/fontfont style="font-family:Times New Roman;font-size:10pt;" that is not otherwise subject to a dispute resolution process. /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation's maxim/fontfont style="font-family:Times New Roman;font-size:10pt;"um obligation under the guarantee/fontfont style="font-family:Times New Roman;font-size:10pt;" is $95 million as of March 31, 2010./fontfont style="f ont-family:Times New Roman;font-size:10pt;" The exposures covered by this guarantee began to expire in 2008/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.25px;"Environmental Liabilities /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:12.2px;"General (Exelon, Generation, ComEd and PECO) /font/pp style='margin-top:4.5pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The Registrants' operations have in the past and may in the future require substantial expenditures in order to comply with environmental laws. Additionally, under Fede ral and state environmental laws, the Registrants are generally liable for the costs of remediating environmental contamination of property now or formerly owned by them and of property contaminated by hazardous substances generated by them. The Registrants own or lease a number of real estate parcels, including parcels on which their operations or the operations of others may have resulted in contamination by substances that are /fontfont style="font-family:Times New Roman;font-size:10pt;"considered hazardous under environmental laws. ComEd and PECO have identified /fontfont style="font-family:Times New Roman;font-size:10pt;"42/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"27/fontfont style="font-family:Times New Roman;font-size:10pt;" sites, respectively, where former /fontfont style="font-family:Times New Roman;font-size:10pt;"MGP t;/fontfont style="font-family:Times New Roman;font-size:10pt;" activities have or may have resulted in actual site contamination. For almost all of these sites, ComEd or PECO is one of several/fontfont style="font-family:Times New Roman;font-size:10pt;" PRPs/fontfont style="font-family:Times New Roman;font-size:10pt;" which may be responsible for ultimate remediation of each location. Of the /fontfont style="font-family:Times New Roman;font-size:10pt;"42/fontfont style="font-family:Times New Roman;font-size:10pt;" sites identified by ComEd, the Illinois /fontfont style="font-family:Times New Roman;font-size:10pt;"EPA/fontfont style="font-family:Times New Roman;font-size:10pt;" or U.S. EPA/fontfont style="font-family:Times New Roman;font-size:10pt;" ha/fontfont style="font-family:Times New Roman;font-size:10pt;"ve/fontfont style="font-family:Times New Roman;f ont-size:10pt;" approved the clean up of /fontfont style="font-family:Times New Roman;font-size:10pt;"11/fontfont style="font-family:Times New Roman;font-size:10pt;" sites and of the /fontfont style="font-family:Times New Roman;font-size:10pt;"27/fontfont style="font-family:Times New Roman;font-size:10pt;" sites identified by PECO, the /fontfont style="font-family:Times New Roman;font-size:10pt;"PA DEP/fontfont style="font-family:Times New Roman;font-size:10pt;" has approved the cleanup of /fontfont style="font-family:Times New Roman;font-size:10pt;"16/fontfont style="font-family:Times New Roman;font-size:10pt;" sites. Of the remaining sites identified by ComEd and PECO, /fontfont style="font-family:Times New Roman;font-size:10pt;"24/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"nine/fontfont style="font-family:Times New Roman;font-size:10pt;" sites, respectively, are currently under some degree of active study and/or remediation. ComEd and PECO anticipate that the majority of the remediation at these sites will continue through at least /fontfont style="font-family:Times New Roman;font-size:10pt;"2015/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2021/fontfont style="font-family:Times New Roman;font-size:10pt;", respectively. In addition, the Registrants are currently involved in a number of proceedings relating to sites/fontfont style="font-family:Times New Roman;font-size:10pt;" where hazardous substances have been deposited and may be subject to additional proceedings in the future. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/p p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Pursuant to orders from the ICC and PAPUC, respectively, ComEd and PECO are authorized to and are currently recovering environmental costs for the remediation of former MGP facility sites from customers, for which they have recorded regulatory assets. /fontfont style="font-family:Times New Roman;font-size:10pt;"See/fontfont style="font-family:Times New Roman;font-size:10pt;" Note#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"3/fontfont style="font-family:Times New Roman;font-size:10pt;"#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"#8212;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"Regulatory /fontfont style="font-family:Times New Roman;font-size:10pt;"Matters/fontfont style="font - -family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"for additional information regarding regulatory assets and liabilities./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"As of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010 and December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;", Exelon, Generation, ComEd and PECO had accrued the following amounts/fontfont style="font-family:Times New Roman;font-size:10pt;" for environmental liabilities:/font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 61px"td style="width: 50px; text-al ign:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"March 31, 2010/font/tdtd colspan="2" style="width: 83px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:83px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Total Environmental Investigation and Remediation Reserve /font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 103px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:103px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000 000;TEXT-ALIGN: center;"Portion of Total Related to MGP Investigation and Remediation /font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Exelon/font/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 172/font/tdtd style="width: 8px; text-align:left ;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 148/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Generation/font/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#1 60;/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 15/font/tdtd style="width: 8px; text-align:right;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" -/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;CO LOR: #000000;"ComEd/font/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 112/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 106/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"PECO/font/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 45/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 42/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr s tyle="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 70px; text-align:left;border-color:#000000;min-width:70px;"#160;/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 51px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/t dtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"December 31, 2009/font/tdtd colspan="2" style="width: 83px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:83px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Total Environmental Investigation and Remediation Reserve /font/tdtd style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"#160;/tdtd colspan="2" style="width: 103px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:103px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Portion of Total Related to MGP Inv estigation and Remediation /font/tdtd style="width: 90px; text-align:center;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Exelon/font/tdtd style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 175/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/td lt;td style="width: 13px; text-align:center;border-color:#000000;min-width:13px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 149/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Generation/font/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 70px; text-align:right;bor der-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 17/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" -/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-width:291px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"ComEd/font/tdtd style="w idth: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 113/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 107/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/trtr style="height: 17px"td style="width: 50px; text-align:left;border-color:#000000;min-width:50px;"#160;/tdtd style="width: 291px; text-align:left;border-color:#000000;min-wi dth:291px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"PECO/font/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 70px; text-align:right;border-color:#000000;min-width:70px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 45/font/tdtd style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"#160;/tdtd style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"#160;/tdtd style="width: 90px; text-align:right;border-color:#000000;min-width:90px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;" 42/font/tdtd style="width: 90px; text-align:left;border-color:#000000;min-width:90px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0 pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The Registrants cannot predict the extent to which they will incur other significant liabilities for additional investigation and remediation costs at these or additional sites identified by environmental agencies or others, or whether such costs may be recoverable from third parties, including customers. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Section#160;316(b) of the Clean Water Act.#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;" In July 2004, the U.S. EPA issued the final Phase II rule implementing Section 316(b) of the Clean Water Act/fontfont style="font-family:Times New Roman;font-size:10pt;", which/fontfont style="font- family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"require/fontfont style="font-family:Times New Roman;font-size:10pt;"d/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"that the cooling water intake structures at electric power plants reflect the best technology available to minimize adverse environmental impacts. The Phase II rule provided each facility with a number of compliance options and permitted site-specific variances based on a cost-benefit analysis. The requirements were intended to be implemented through state-level NPDES permit programs. All of Generation's power generation facilities with cooling water systems are subject to the regulati/fontfont style="font-family:Times New Roman;font-size:10pt;"ons. Facilities without closed-/fontfont style="font-family:Times New Roman;font-si ze:10pt;"cycle recirculating systems (e.g., cooling towers) are potentially most affected. Those facilities are /fontfont style="font-family:Times New Roman;font-size:10pt;"Clinton/fontfont style="font-family:Times New Roman;font-size:10pt;", Cromby, /fontfont style="font-family:Times New Roman;font-size:10pt;"Dresden/fontfont style="font-family:Times New Roman;font-size:10pt;", Eddystone, Fairless Hills, Handley, Mountain Creek, Oyster Creek, Peach Bottom, /fontfont style="font-family:Times New Roman;font-size:10pt;"Quad/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Cities/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"Salem/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fon tfont style="font-family:Times New Roman;font-size:10pt;"Schuylkill/fontfont style="font-family:Times New Roman;font-size:10pt;". Since promulgation of the rule, Generation has been evaluating compliance options at its affected plants and meeting interim compliance deadlines. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In a 2007 decision/fontfont style="font-family:Times New Roman;font-size:10pt;", the /fontfont style="font-family:Times New Roman;font-size:10pt;"U.S./fontfont style="font-family:Times New Roman;font-size:10pt;" Second Circuit Court of Appeals remanded the /fontfont style="font-family:Times New Roman;font-size:10pt;"Phase II /fontfont style="font-family:Times New Roman;font-size:10pt;"rule back to the EPA for revisions. By its action, the court invalidated compliance measures which were supported by the utility industry because they were cost-effective and provided existing plants with needed flexibility in selecting the compliance option appropriate to its location and operations. On July 9, 2007, the EPA formally suspended the Phase II rule. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In/fontfont style="font-family:Times New Roman;font-size:10pt;" April 2009, the /fontfont style="font-family:Times New Roman;font-size:10pt;"U.S. /fontfont style="font-family:Times New Roman;font-size:10pt;"Supreme Court reversed the decision of the /fontfont style="font-family:Times New Roman;font-size:10pt;"U.S./fontfont style="font-family:Times New Roman;font-size:10pt;" Second Circuit Court of Appeals that had invalidated the use of a cost-benefit /fontfont style="font-family:Times New Roman; font-size:10pt;"analysis under Section 316(b)/fontfont style="font-family:Times New Roman;font-size:10pt;". The EPA will now take up consideration of the rule on remand and take further action consistent with the opinions of the Supreme Court and the Court of Appeals, including whether to exercise its discretion to retain or modify the cost-benefit rule as it appeared in the initial regulation. It is expected that the EPA will issue a proposed rule on remand in 2010. /fontfont style="font-family:Times New Roman;font-size:10pt;"Until then, /fontfont style="font-family:Times New Roman;font-size:10pt;"the state permitting agencies will continue the current practice of applying their best professional judgment to address impingement and entrainment requirements at plant cooling water intake structures/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"The Co urts' opinions have created significant uncertainty about the specific nature, scope and timing of the final compliance requirements. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In a draft permit issued on July 19, 2005, as part of the pending NPDES permit renewal process for Oyster Creek, the NJDEP preliminarily determined that closed-cycle cooling and environmental restoration are the only viable compliance options for Section 316(b) compliance at Oyster Creek. /fontfont style="font-family:Times New Roman;font-size:10pt;"In light of the EPA's suspension of the Phase II rule, o/fontfont style="font-family:Times New Roman;font-size:10pt;"n January 7, 2010, the NJDEP issued a draft NPDES permit for Oyster Creek that would require/fontfont style="font-family:Times New Roman;font-size:10pt;", in the exercise of its best professional judgment,/font t;font style="font-family:Times New Roman;font-size:10pt;" the installation of cooling towers /fontfont style="font-family:Times New Roman;font-size:10pt;"as the best technology available /fontfont style="font-family:Times New Roman;font-size:10pt;"within seven years after the effective date of the permit. Oyster Creek will continue to operate under its current permit, issued in 1994, until the draft permit is finalized after a period of public comment. Generation believes the public comment period and regulatory process could take up to two years before a final permit is issued. Should the permit be issued in its current form, Generation estimates it would be required to have cooling towers in operation by 2019. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Generation estimates that the cost to retrofit Oyster Creek with closed cycle cooling towers would be a pproximately $700 million to $800 million. This cost estimate includes construction materials and labor, lost capacity and energy revenue during construction, and other ongoing incremental operating and maintenance costs. Generation believes that these additional costs would call into question the economic viability of operating Oyster Creek until the expiration of its current operating license in 2029, and Generation would close Oyster Creek if either the final Section 316(b) regulations or NJDE/fontfont style="font-family:Times New Roman;font-size:10pt;"P requirements have performance standards that require /fontfont style="font-family:Times New Roman;font-size:10pt;"the installation of cooling towers. Closure of Oyster Creek could result in reliability issues associated with the transmission system. Generation believes the period allowed for compliance will be sufficient to address any transmission reliability issues before operations at Oyster Creek are shut down. If PJM r equires the plant to operate under a "reliability-must-run" order, Generation would be allowed full recovery of its costs to operate until the transmission issues are resolved. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"In June 2001, the NJDEP issued a renewed NDPES permit for /fontfont style="font-family:Times New Roman;font-size:10pt;"Salem/fontfont style="font-family:Times New Roman;font-size:10pt;", allowing for the continued operation of /fontfont style="font-family:Times New Roman;font-size:10pt;"Salem/fontfont style="font-family:Times New Roman;font-size:10pt;" with its existing cooling water system. NJDEP advised PSEG in July 2004 that it strongly recommended reducing cooling water intake flow commensurate with closed-cycle cooling as a compliance option for /fontfont style="font-family:Times New Roman;font-size:10p t;"Salem/fontfont style="font-family:Times New Roman;font-size:10pt;". PSEG submitted an application for a renewal of the permit on February 1, 2006. In the permit renewal application, PSEG analyzed closed-cycle cooling and other options and demonstrated that the continuation of the Estuary Enhancement Program, an extensive environmental restoration program at /fontfont style="font-family:Times New Roman;font-size:10pt;"Salem/fontfont style="font-family:Times New Roman;font-size:10pt;", is the best technology to meet the Section 316(b) requirements. PSEG continues to operate /fontfont style="font-family:Times New Roman;font-size:10pt;"Salem/fontfont style="font-family:Times New Roman;font-size:10pt;" under the approved June 2001 NDPES permit while the NDPES permit renewal application is being reviewed. If the final permit or Section 316(b) regulations ultimately requires the retrofitting of Salem's cooling water intake struct ure to reduce cooling water intake flow commensurate with closed-cycle cooling, Exelon's and Generation's share of the total cost of the retrofit and any resulting interim replacement power would likely be in excess of $500 million and could result in increased depreciation expense related to the retrofit investment. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Generation will contest the requirement to install cooling towers throughout the administrative permitting process and is optimistic that any final regulations or permits will not require closed-cycle cooling at Oyster Creek or /fontfont style="font-family:Times New Roman;font-size:10pt;"Salem/fontfont style="font-family:Times New Roman;font-size:10pt;". In addition, the economic viability of Generation's other power generation facilities without closed-cycle cooling water systems will be called into question by any requirement to construct cooling towers. Given the uncertainties associated with these proceedings and the time required for their resolution, Generation cannot predict the eventual outcome of the proceedings or estimate the effect that compliance with any resulting Section 316(b) or interim state requirements will have on the operation of its generating facilities and its future results of operations, cash flows and financial position. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Nuclear G/fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"enerating Station Groundwater./fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"In 2005 and 2006, the I llinois EPA issued NOVs to Generation alleging violations of state groundwater standards at the Braidwood, /fontfont style="font-family:Times New Roman;font-size:10pt;"Dresden/fontfont style="font-family:Times New Roman;font-size:10pt;" and Byron generating stations/fontfont style="font-family:Times New Roman;font-size:10pt;" related to tritium leaks at the plants/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"Tritium is a weak radioactive isotope of hydrogen that is produced and released at all nuclear sites and also is released naturally through the interaction of sunlight and water molecules. /fontfont style="font-family:Times New Roman;font-size:10pt;"In addition, the/fontfont style="font-family:Times New Roman;font-size:10pt;" Illinois Attorney General /fontfont style="font-family:Times New Roman;font-size :10pt;"and the/fontfont style="font-family:Times New Roman;font-size:10pt;" State's Attorney for the Counties in which the plants are located/fontfont style="font-family:Times New Roman;font-size:10pt;" filed civil enforcement lawsuits against Generation/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"On March 11, 2010, Generation agreed to a settlement of all pending actions related to the leaks. Under the terms of the settlement/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" Generation will pay approximately $1./fontfont style="font-family:Times New Roman;font-size:10pt;"2 /fontfont style="font-family:Times New Roman;font-size:10pt;"million in civil pe nalties and fund/fontfont style="font-family:Times New Roman;font-size:10pt;"s for/fontfont style="font-family:Times New Roman;font-size:10pt;" supplemental environmental projects in the communities where the plants are located. Generation had recorded appropriate reserves for these claims and related/fontfont style="font-family:Times New Roman;font-size:10pt;" remediation costs as of March 31, 2010 and December 31, 2009. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"As part of its normal ope/fontfont style="font-family:Times New Roman;font-size:10pt;"rations, Generation performs on/fontfont style="font-family:Tim es New Roman;font-size:10pt;"going environmental monitoring at its sites.#160;#160;Generation's monitoring activities#160;sometimes#160;detect the release of measurable levels of tritium.#160; These releases#160;do not pose a threat to Generation's employees, the public, or the environment.#160; Generation has reported, and may in the future report such tritium releases#160;to soil or groundwater at#160;its stations./fontfont style="font-family:Times New Roman;font-size:10pt;"#160;/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Cotter Corporation./fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"#160;#160;/fontfont style="font-family:Times New Ro man;font-size:10pt;" The U.S. EPA has advised Cotter Corporation (Cotter), a former ComEd subsidiary, that it is potentially liable in connection with radiological contamination at a site known as the West Lake Landfill in /fontfont style="font-family:Times New Roman;font-size:10pt;"Missouri/fontfont style="font-family:Times New Roman;font-size:10pt;". On February 18, 2000, ComEd sold Cotter to an unaffiliated third party. As part of the sale, ComEd agreed to indemnify Cotter for any liability arising in connection with the West Lake Landfill. In connection with Exelon's 2001 corporate restructuring, this responsibility to indemnify Cotter was transferred to Generation. Cotter is alleged to have disposed of approximately 39,000 tons of soils mixed with 8,700 tons of leached barium sulfate at the site. On May 29, 2008, the U.S. EPA issued a Record of Decision approving the remediation option submitted by Cotter and the two other PRPs that required additional landfill cover. The current estimated cost of the anticipated landfill cover remediation for the site is $37 million, which will be allocated among all PRPs. Generation has accrued what it believes to be an adequate amount to cover its anticipated share of such liability. By letter dated January 11, 2010, the EPA requested that the PRPs perform a supplemental feasibility study for a remediation alternative that would involve excavation of the radiological contamination. An excavation remedy would be significantly more expensive than the previously selected additional cover remedy. /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation cannot determine at this time whether the alternative remedy will be required, and if it is, Generation's share of the cost for such alternative remedy./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bo ttom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Air.#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"On July 11, 2008, the U.S. Court of Appeals for the District of Columbia Circuit (D.C. Circuit Court) vacated the CAIR, which had been promulgated by the U.S. EPA to reduce power plant emissions of SO/fontfont style="font-family:Times New Roman;font-size:8pt;"2/fontfont style="font-family:Times New Roman;font-size:10pt;" and NO/fontfont style="font-family:Times New Roman;font-size:8pt;"x/fontfont style="font-family:Times New Roman;font-size:10pt;". The Court later remanded the CAIR to the U.S. EPA, without invalidating the entire rulemaking, so that the U.S. EPA may remedy "CAIR's flaws" in accordance with the Court's July 11, 2008 opinion. This decision allows the CAIR to remain in effect until it is replaced by a rule consistent with the Court's July 11 opinion. /fontfont style="font-family:Times New Roman;font-size:10pt;"The U.S. EPA is expected to issue a new proposed CAIR rulemaking in /fontfont style="font-family:Times New Roman;font-size:10pt;"the first half of/fontfont style="font-family:Times New Roman;font-size:10pt;" 2010./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"On March 5, 2009, the D.C. Circuit Court remanded /fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;"Sierra Club and Environment North Carolina vs. EPA/fontfont style="font-family:Times New Roman;font-size:10pt;" to the U.S. EPA for reconsideration of its denial of North Carolina's Section 126 petition, originally filed in 2004, that re quested that the U.S. EPA impose NO/fontfont style="font-family:Times New Roman;font-size:8pt;"x/fontfont style="font-family:Times New Roman;font-size:10pt;" and SO/fontfont style="font-family:Times New Roman;font-size:8pt;"2/fontfont style="font-family:Times New Roman;font-size:10pt;" emission reduction requirements on various named upwind states (including Illinois and Pennsylvania) whose air emissions North Carolina contended were contributing significantly to nonattainment in North Carolina/fontfont style="font-family:Times New Roman;font-size:10pt;". The U.S. EPA has agreed to re-visit /fontfont style="font-family:Times New Roman;font-size:10pt;"North Carolina/fontfont style="font-family:Times New Roman;font-size:10pt;"'s Section 126 petition for potential rulemaking and could attempt to address /fontfont style="font-family:Times New Roman;font-size:10pt;"North Carolina/fon tfont style="font-family:Times New Roman;font-size:10pt;"'s concerns as part of its CAIR revisions or via a separate rulemaking./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"At this time, Exelon is unable to predict the exact approach that will be utilized by the U.S. EPA to revise its CAIR regulation, how long the current CAIR program will remain in effect, or what steps individual states may take in response to the CAIR situation. Due to the uncertainty as to any of the potential outcomes related to CAIR and /fontfont style="font-family:Times New Roman;font-size:10pt;"North Carolina/fontfont style="font-family:Times New Roman;font-size:10pt;"'s Section 126 petition, Exelon cannot estimate the effect of the decision on its operations and its future competitive position, results of operations, earnings, cash flows and financial position. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In March 2005, the U.S. EPA finalized the CAMR, which is a national program to cap mercury emissions from fossil-fired generating units starting in 2010, with a second reduction in the mercury emission cap level scheduled for 2018. The D.C. Circuit Court later vacated the CAMR on the basis that the U.S. EPA had failed to properly de-list mercury as a hazardous air pollutant (HAP) under Section 112(c)(1) of the Clean Air Act. The result of this decision is that mercury emissions from electric generating stations are subject to the more stringent requirements of maximum achievable control technology applicable to hazardous air pollutants. On February 23, 2009, the U.S. Supreme Court declined to review the D.C. Circuit Court's CAMR decision. The U.S. EPA is now expected to propose a new rulemaking, likely in 2010, to address HAP emissions from electric generation power plants. In addition to regulation at the national level, Exelon had been subject to more stringent mercury regulation enacted in 2006 at the state level in /fontfont style="font-family:Times New Roman;font-size:10pt;"Pennsylvania/fontfont style="font-family:Times New Roman;font-size:10pt;" (PA Mercury Rule). However, on January 30, 2009, the Commonwealth Court of Pennsylvania ruled that the PA Mercury Rule is unlawful and invalid and enjoined the state from continued implementation and enforcement of the rule. On December 23, 2009, the Supreme Court of Pennsylvania upheld the /fontfont style="font-family:Times New Roman;font-size:10pt;"Commonwealth Court/fontfont style="font-family:Times New Roman;font-size:10pt;" decision, and therefore mercury emissions are not regulated by the state. The nature and extent of future regulatory controls on HAP emissions at electric generat ion power plants will not be determined until the Federal regulations are finalized by the U.S. EPA. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The EPA has announced that it will complete a review of the national ambient air quality standards by the end of 2011 for ozone (nitrogen oxide and volatile organic chemicals), particulate matter, carbon monoxide, nitrogen dioxide, sulfur dioxide, and lead. This review could result in more stringent emissions limits on fossil-fired electric generating stations. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:24.5px;"Notices and Finding of Violations Related to Electric Generation Stations./fontfont style="font-family:Times New Roman;font-size:10pt;" On August 6, 2007, ComEd received an NOV, addressed to it and Midwest Generation, LLC (Midwest Generation) from the U.S. EPA, alleging that ComEd and Midwest Generation have violated and are continuing to violate several provisions of the Federal Clean Air Act as a result of the modification and/or operation of six electric generation stations located in northern Illinois that have been owned and operated by Midwest Generation since 1999. The U.S. EPA requested information related to the stations in 2003, and ComEd has been cooperating with the U.S. EPA since then. The NOV states that the U.S. EPA may issue an order requiring compliance with the relevant Clean Air Act provisions and may seek injunctive relief and/or civil penalties, all pursuant to the U.S. EPA's enforcement authority under the Clean Air Act. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"The generating stations that are the subject of the NOV are currently owned and operated by Midwest Ge neration, which purchased the stations in December 1999 from ComEd. Under the terms of the sale agreement, Midwest Generation and its affiliate, Edison Mission Energy (EME), assumed responsibility for environmental liabilities associated with the ownership, occupancy, use and operation of the stations, including responsibility for compliance of the stations with environmental laws before the purchase of the stations by Midwest Generation. Midwest Generation and EME additionally agreed to indemnify and hold ComEd and its affiliates harmless from claims, fines, penalties, liabilities and expenses arising from third party claims against ComEd resulting from or arising out of the environmental liabilities assumed by Midwest Generation and EME under the terms of the agreement governing the sale. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"In connection with Exelon's 2001 corporate restructuring, Genera tion assumed ComEd's rights and obligations with respect to its former generation business. Exelon, Generation and ComEd are unable to predict the ultimate resolution of the claims alleged in the NOV, the costs that might be incurred or the amount of indemnity that may be available from Midwest Generation and EME; however, Exelon, Generation and ComEd have concluded that a loss is not probable or estimable and accordingly, have not recorded a reserve for the NOV. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"On January 14, 2009, Generation received an NOV, addressed to it, the other owners of Keystone Generating Station (Keystone) and Reliant Energy Northeast Management Company (the operator of Keystone) from the U.S. EPA, alleging past and continuing violations of several provisions of the Federal Clean Air Act as a result of the modification and/or operation of Keystone, as well as two other stati ons currently owned and operated by Reliant Energy in which Generation has no ownership interest. Generation has been cooperating with the U.S. EPA since the time of requests for information in 2000, 2001 and 2007. The NOV states that the U.S. EPA may issue an order requiring compliance with the relevant Clean Air Act provisions and may seek injunctive relief and/or civil penalties, all pursuant to the U.S. EPA's enforcement authority under the Clean Air Act. At this time, Exelon and Generation are unable to predict the ultimate resolution of the claims alleged in the NOV or the costs that might be incurred by Generation; however, Exelon and Generation have concluded that a loss is not probable or estimable and, accordingly, have not recorded a reserve for the NOV. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"On April 16, 2009, the U.S. EPA issued an NOV to ComEd and Dominion Resources Services, In c. (Dominion) alleging past and continuing violations of several provisions of the Federal Clean Air Act as a result of the modification and/or operation of Kincaid electric generating station located in /fontfont style="font-family:Times New Roman;font-size:10pt;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;" and State Line electric generating station located in /fontfont style="font-family:Times New Roman;font-size:10pt;"Indiana/fontfont style="font-family:Times New Roman;font-size:10pt;". Kincaid was sold by ComEd in 1998/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" and State Line was sold by Commonwealth Edison of Indiana, a wholly owned subsidiary of ComEd, in 1997. Both stations are currently owned and operated by Dominion. The U.S. EPA requested information related to the stations in 2009, and ComEd has been cooperating with the U.S. EPA since the time of that request. The NOV states that the U.S. EPA may issue an order requiring compliance with the relevant Clean Air Act provisions and may seek injunctive relief and/or civil penalties, all pursuant to the U.S. EPA's enforcement authority under the Clean Air Act. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"Under the terms of the sales agreements for the Kincaid and State Line stations, each party agreed to indemnify the other for certain environmental activities, events, conditions or occurrences arising before and after the purchase of the stations; however, Exelon, Generation, and ComEd are unable at this time to determine how those provisions may apply to any liability or cost that may eventually arise out of the NOV or any resulting enforcement action. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-fa mily:Times New Roman;font-size:10pt;margin-left:36px;"In connection with Exelon's 2001 corporate restructuring, Generation assumed ComEd's rights and obligations related to ComEd's former generation business, which would include any responsibility under the indemnification provisions contained in the sale agreements related to Kincaid and State Line stations. At this time, Exelon, Generation and ComEd are unable to predict the ultimate resolution of the claims alleged in the NOV or the costs that might be incurred by Generation or ComEd; however, Exelon, Generation and ComEd have concluded that a loss is not probable or estimable and, accordingly, have not recorded a reserve for the NOV. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:36px;"Climate Change Regulation./fontfont style="font-family:Times New Roman;font-size:10pt;" Exelon is subject to climate change regulation or legislation at the international, Federal, regional and state levels. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:36px;"International Climate Change Regulation./fontfont style="font-family:Times New Roman;font-size:10pt;" At the international level, the /fontfont style="font-family:Times New Roman;font-size:10pt;"United States/fontfont style="font-family:Times New Roman;font-size:10pt;" is currently not a party to the Kyoto Protocol, which is a protocol to the United Nations Framework Convention on Climate Change (UNFCCC) and became effective for signatories on February 16, 2005. The United Nations' Kyoto Protocol process generally requires developed countries to cap GHG emissions at certain levels during the 2008-2012 time period. At the conclusion of the December 2007 United Nations Climate Change Conference in / fontfont style="font-family:Times New Roman;font-size:10pt;"Bali/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"Indonesia/fontfont style="font-family:Times New Roman;font-size:10pt;", the Bali Action Plan was adopted, which identifies a work group, process and timeline for the consideration of possible post-2012 international actions to further address climate change. In December 2009, the /fontfont style="font-family:Times New Roman;font-size:10pt;"United States/fontfont style="font-family:Times New Roman;font-size:10pt;" agreed to the non-binding Copenhagen Accord at the conclusion of the 15th Conference of the Parties under the UNFCCC. Under the Copenhagen Accord, the /fontfont style="font-family:Times New Roman;font-size:10pt;"United States/fontfont style="font-family:Times New Roman;font-size:10pt;" agreed to undertake a number of voluntary measures, including the establishment of a goal to reduce GHG emissions and contributions toward a fund to assist developing nations to address their GHG emissions. The next Conference of the Parties is scheduled for /fontfont style="font-family:Times New Roman;font-size:10pt;"Mexico/fontfont style="font-family:Times New Roman;font-size:10pt;" in late 2010. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:36px;"Federal Climate Change Legislation and Regulation./fontfont style="font-family:Times New Roman;font-size:10pt;" Various stakeholders, including Exelon, legislators and regulators, shareholders and non-governmental organizations, as well as other companies in many business sectors are considering ways to address the climate change issue. Mandatory programs to reduce GHG emissions are likely to evolve in t he future. If these programs become effective, Exelon may incur costs either to further limit or offset the GHG emissions from its operations or procure emission allowances or credits. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"Numerous bills have been introduced in Congress that address climate change from different perspectives, including direct regulation of GHG emissions and the establishment of Federal /fontfont style="font-family:Times New Roman;font-size:10pt;"Renewable Portfolio Standards/fontfont style="font-family:Times New Roman;font-size:10pt;". Exelon supports the enactment, through Federal legislation, of a cap-and-trade program for GHG emissions that is mandatory, economy-wide and designed in a way to limit potential harm to the economy and protect consumers. Exelon believes that any mechanism for allocation of GHG emission allowances should include si gnificant free grants of allowances to electric (and potentially gas) distribution companies to help offset the cost impact of GHG regulation to the end-use consumer. Over the last few years, Exelon has worked with other businesses and environmental organizations that participate in the United States Climate Action Partnership to support the development of an integrated package of recommendations for the Federal government to address the climate change issue through Federal legislation, including aggressive emission reduction targets for total U.S. emissions and robust cost containment measures to ensure that program costs are reasonable. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"Federal climate change legislation is currently under consideration in the U.S. Congress. H.R. 2454, "The American Clean Energy and Security Act of 2009," which Exelon supported, was approved by the U.S. House of Represen tatives on June 26, 2009 and would affect electric generation and electric and natural gas distribution companies. A key provision of H.R. 2454 is the establishment of mandatory, economy-wide GHG reduction targets and goals via a Federal emissions cap-and-trade program. The program would begin in 2012 and calls for a three percent reduction below 2005 levels in 2012, with the reduction requirement increasing to 17% below 2005 levels by 2020 and ultimately 83% below 2005 levels by 2050. The legislation also contains several energy efficiency and clean energy requirements. Of particular note for electric retail supply companies, there is a proposed requirement that 20% of electricity sold by retail suppliers be met by energy efficiency and renewable energy by 2020. The requirement begins to phase-in starting in 2012 at a six percent level and escalates every two years until it reaches 20% in 2020. On September 30, 2009, S. 1733, the Clean Energy Jobs and American Power Act, was introduced in the U.S. Senate. S .1733 sets forth a cap-and-trade program and contains other provisions to regulate GHGs that are similar to those contained in H.R. 2454, but does not yet provide the specific details regarding the allocation of allowances. /fontfont style="font-family:Times New Roman;font-size:10pt;"It is uncertain when the Senate will take up consideration of S. 1733./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"In 2007, the U.S. Supreme Court ruled that GHG emissions are pollutants subject to regulation under the new motor vehicle provisions of the Clean Air Act. In response to the decision, on July 11, 2008, the U.S. EPA issued an Advance Notice of Proposed Rulemaking to solicit public comments on legal and regulatory analyses and policy /fontfont style="font-family:Times New Roman;font-size:10pt;"alternat ives regarding GHG effects and regulation under the Clean Air Act. On December 7, 2009, the U.S. EPA issued an endangerment finding under Section 202 of the Clean Air Act regarding GHGs from new motor vehicles and /fontfont style="font-family:Times New Roman;font-size:10pt;"on April 1, 2010 issued final/fontfont style="font-family:Times New Roman;font-size:10pt;" regulations /fontfont style="font-family:Times New Roman;font-size:10pt;"limiting GHG emissions from cars and light trucks effective on January 2, 2011/fontfont style="font-family:Times New Roman;font-size:10pt;". While such regulations /fontfont style="font-family:Times New Roman;font-size:10pt;"do/fontfont style="font-family:Times New Roman;font-size:10pt;" not specifically address stationary sources, such as a generating plant, it is the U.S. EPA's position that the regulation of GHGs under the mobile source provisions of the Clean Air Act will trigger permitting requirements for /fontfont style="font-family:Times New Roman;font-size:10pt;"new and modified /fontfont style="font-family:Times New Roman;font-size:10pt;"stationary sources/fontfont style="font-family:Times New Roman;font-size:10pt;" effective January 2, 2011. /fontfont style="font-family:Times New Roman;font-size:10pt;"Therefore, on September 30, 2009, the U.S. EPA issued/fontfont style="font-family:Times New Roman;font-size:10pt;" proposed regulations for permitting for large stationary sources (greater than 25,000 tons per year of GHG emissions, on a CO/fontfont style="font-family:Times New Roman;font-size:8pt;"2/fontfont style="font-family:Times New Roman;font-size:10pt;" equivalent basis). Under the proposal, large stationary sources could be required to install Best Available Control Technology, to be determined on a case-by-case basis. /font/pp style='margi n-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"The issue of GHG regulation of stationary sources will likely be addressed either under the existing provisions of the Clean Air Act by U.S. EPA regulation, or by new and comprehensive Federal legislation. The Obama administration and the U.S. EPA have stated a preference for addressing the issue through Federal legislation. /fontfont style="font-family:Times New Roman;font-size:10pt;"The extent to which GHG emissions will be regulated is currently unknown; however, potential regulation of GHG emissions from stationary sources could cause Exelon to incur material costs of compliance./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:36px;"Regional and State Climate Change Legislation and Re gulation./fontfont style="font-family:Times New Roman;font-size:10pt;" At a regional level, on November 15, 2007, six Midwest state Governors (/fontfont style="font-family:Times New Roman;font-size:10pt;"Illinois/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"Iowa/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"Kansas/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"Michigan/fontfont style="font-family:Times New Roman;font-size:10pt;", /fontfont style="font-family:Times New Roman;font-size:10pt;"Minnesota/fontfont style="font-family:Times New Roman;font-size:10pt;" and/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Wisconsin/fontfont style="font-family:Times New Roman;font-size:10pt;") signed the Midwestern Greenhouse Gas Accord. Under /fontfont style="font-family:Times New Roman;font-size:10pt;"th/fontfont style="font-family:Times New Roman;font-size:10pt;"at/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Accord, an inter-state work group was formed to establish a Midwestern GHG Reduction Program that will: (1) establish GHG reduction targets and timeframes consistent with member state targets; (2) develop a market-based and multi-sector cap-and-trade program to help achieve GHG reductions; and (3) develop other mechanisms and policies to assist in meeting GHG reduction targets (e.g. a low carbon fuel standard). In October 2009, the Governors decided to defer action on the regional GHG reduction initiatives pending resolution of /fontfont style="font-family:Times New Roman;font-size:10pt;"F/fontfont style="font-family:Times New Roman;font-size:10pt;"ederal legislation. /font/pp style='margin-top:5pt; margin-bottom:5pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"At the state level, the PCCA was signed into law in July 2008. The PCCA requires, among other things, that a Climate Change Advisory Committee be formed, that a report on the potential impact of climate change in Pennsylvania be developed, that the PA DEP develop a GHG inventory for Pennsylvania, that a voluntary GHG registry be identified, and that the PA DEP, in consultation with the Climate Change Advisory Committee, develop a Climate Change Action Plan for Pennsylvania to be reviewed with the Pennsylvania General Assembly. The Climate Change Advisory Committee issued its recommendations for an Action Plan on Oc tober 9, 2009 and they are currently being considered by the /fontfont style="font-family:Times New Roman;font-size:10pt;"Pennsylvania/fontfont style="font-family:Times New Roman;font-size:10pt;" legislature. /font/pp style='margin-top:9pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:36px;"At this time, Exelon is unable to estimate the potential impacts of any future mandatory GHG legal or regulatory requirements on its businesses. /font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.2px;"Litigation /fontfont style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;"Matters/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/p lt;p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"Except to the extent noted below, the circumstances set forth in /fontfont style="font-family:Times New Roman;font-size:10pt;"Note /fontfont style="font-family:Times New Roman;font-size:10pt;"18/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"of/fontfont style="font-family:Times New Roman;font-size:10pt;" the/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;" Form 10-K /fontfont style="font-family:Times New Roman;font-size:10pt;"describe/fontfont style="font-family:Times New Roman;font-size:10pt;", in all material respects, the current status of /fontfont style="font-family:Times New Roman;font-size:10pt;"litigation/fontfont style="font-family:Times New Roman;font-size:10pt;" matters/fontfont style="font-family:Times New Roman;font-size:10pt;". The following /fontfont style="font-family:Times New Roman;font-size:10pt;"is an update to that discussion/fontfont style="font-family:Times New Roman;font-size:10pt;"./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:12.2px;"Exelon and Generation /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:24.5px;"Asbestos Personal Injury Claims/fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;"./fontfont style="font-family:Times New Roman;font-size:10pt;font-style:italic;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation maintains a reserve for claims associated with asbestos-related personal injury actions in certain facilities that are currently owned by Generation or were previously owned by ComEd and PECO. The reserve is recorded on an undiscounted basis and excludes the estimated legal costs associated with handling these matters, which could be material. In the second quarter of 2008, Generation revised the period through which it estimates that claims will be presented from 2030 to 2050./fontfont style="font-family:Times New Roman;font-size:12pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"./font/ pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"At /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010 and December 31, 2009/fontfont style="font-family:Times New Roman;font-size:10pt;", Generation had reserved approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"49/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"million/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"in total for asbestos-related bodily injury claims. As of /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style= "font-family:Times New Roman;font-size:10pt;", approximately /fontfont style="font-family:Times New Roman;font-size:10pt;"$/fontfont style="font-family:Times New Roman;font-size:10pt;"14/fontfont style="font-family:Times New Roman;font-size:10pt;" mi/fontfont style="font-family:Times New Roman;font-size:10pt;"llion of this amount related to/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"164/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"open/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"claims/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman; font-size:10pt;"presented/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"to/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation,/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"while/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"the/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"remaining $/fontfont style="font-family:Times New Roman;font-size:10pt;"35/fontfont style="font-family:Times New Roman;font-size:10pt;"#160;million of the reserv e is for estimated future asbestos-related bodily injury claims anticipated to arise through 2050 based on actuarial assumptions and analyses, which are updated on an annual basis. On a quarterly basis, Generation monitors actual experience against the number of forecasted claims to be received and expected claim payments and evaluates whether an adjustment to the reserve is necessary. During /fontfont style="font-family:Times New Roman;font-size:10pt;"2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;", the updates to this reserve did not result in material adjustments./fontfont style="font-family:Times New Roman;font-size:10pt;" /font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font - -family:Times New Roman;font-size:10pt;font-style:italic;margin-left:12.25px;"Exelon /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:12.25px;"Pension Claims./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"On February 22, 2010, the U.S. Supreme Court declined to hear an appeal of the July 2, 2009 decision of the U.S. Court of Appeals for the Seventh Circuit affirming dismissal of claims that the calculation of lump sum benefits earned under the Exelon Corporation Cash Balance Pension Plan did not comply with ERISA. The Plan's motion for summary judgment on remaining claims regarding the /fontfont style="font-family:Times New Roman;font-size:10pt;"P/fontfont style="font-family:Times New Roman;font-size:10pt;"lan's /fontfont style="font-family:Times New Roman;font-size:10pt;"calculation of lump sum benefits earned under a prior, traditional pension formula remains pending before the U.S. District Court for the Northern District of Illinois. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:12.25px;"Exelon, Generation, ComEd and PECO /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:36px;"General.#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"The Registrants are involved in various other litigation matters that are being defended and h andled in the ordinary course of business. The Registrants maintain accruals for such costs that are probable of being incurred and subject to reasonable estimation. The Registrants will record a receivable if they expect to recover costs for these contingencies. The ultimate outcomes of such matters, as well as the matters discussed above, are uncertain and may have a material adverse impact on the Registrants' results of operations, cash flows or financial positions./font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:12.25px;"Income Taxes /font/pp style='margin-top:5.6pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:24.5px;"See/fontfont style="font-family:Times New Roman;font-size:10pt;" Note/fontfont style="font-f amily:Times New Roman;font-size:10pt;" 9 #8212; Income Taxes for information regarding the Registrants' income tax refund claims and certain tax positions, including the 1999 sale of fossil generating assets. /font/p

Supplemental Financial Information	3 Months Ended
Supplemental Financial Information	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Supplemental Financial Information (Exelon, Generation, ComEd and PECO)	p style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"13.#160;#160;#160;#160;Supplemental Financial Information (Exelon, Generation, ComEd and PECO)/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;font-style:italic;margin-left:18px;"Supplemental Statement of Operations Information/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;ma rgin-left:0px;"#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:10pt;"The following tables provide additional information about the Registrants' Consolidated Statements of/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Operations for the three months ended /fontfont style="font-family:Times New Roman;font-size:10pt;"March 31, 2010/fontfont style="font-family:Times New Roman;font-size:10pt;" and /fontfont style="font-family:Times New Roman;font-size:10pt;"2009/fontfont style="font-family:Times New Roman;font-size:10pt;":/font/pp style='margin-top:0pt; 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text-align:left;border-color:#000000;min-width:6px;"#160;/tdtd style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 6px; text-align:left;border-color:#000000;min-width:6px;"#160;/tdtd style="width: 12px; border-top-style:solid;border - -top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 33px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:33px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/td/trtr style="height: 17px"td colspan="3" style="width: 394px; 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border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:47px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1/font/tdtd style="width: 6px; text-align:left;border-color:#000000;min-width:6px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3/font/tdtd style="width: 6px; text-align:left;border-color:#000000;min-width:6px;"#160;/tdtd style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text- align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 33px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:33px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"4/font/td/trtr style="height: 7px"td style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 24px; text-align:left;border-color:#000000;min-width:24px;"#160;/tdtd style="width: 340px; text-align:left;border-color:#000000;min-width:340px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 46px; text-align:center;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd style=" width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 47px; text-align:center;border-color:#000000;min-width:47px;"#160;/tdtd style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:center;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 33px; text-align:center;border-color:#000000;min-width:33px;"#160;/td/trtr style="height: 18px"td colspan="3" style="width: 394px; text-align:left;border-color:#000000;min-width:394px;"font style="FONT-FAMILY: T imes New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Other, net /font/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 46px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"93/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 47px; border-bottom-style:double;bor der-bottom-width:3px;text-align:right;border-color:#000000;min-width:47px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"79/font/tdtd style="width: 6px; text-align:left;border-color:#000000;min-width:6px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"3/font/tdtd style="width: 6px; text-align:left;border-color:#000000;min-width:6px;"#160;/tdtd style="width: 12px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000; min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 33px; 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text-align:left;border-color:#000000;min-width:6px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td colspan="3" style="width: 394px; text-align:left;border-color:#000000;min-width:394px;"font sty le="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;"Three Months Ended March 31, 2009/font/tdtd colspan="2" style="width: 58px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:58px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon/font/tdtd style="width: 5px; text-align:center;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 58px; 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text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 46px; text-align:left;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 46px; text-align:left;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style=" width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 33px; text-align:left;border-color:#000000;min-width:33px;"#160;/td/trtr style="height: 17px"td style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd colspan="2" style="width: 364px; text-align:left;border-color:#000000;min-width:364px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Net realized income on decommissioning trust funds /font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160; /tdtd style="width: 46px; text-align:left;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 46px; text-align:left;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 33px; text-align:left;border-col or:#000000;min-width:33px;"#160;/td/trtr style="height: 17px"td style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd style="width: 24px; text-align:left;border-color:#000000;min-width:24px;"#160;/tdtd style="width: 340px; text-align:left;border-color:#000000;min-width:340px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Regulatory Agreement Units (a)/font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 46px; text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"18/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;" amp;#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 46px; text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"18/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;" amp;#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 33px; text-align:right;border-color:#000000;min-width:33px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/td/trtr style="height: 17px"td style="width: 30px; text-align:left;border-color:#000000;min-width:30px;"#160;/tdtd colspan="2" style="width: 364px; text-align:left;border-color:#000000;min-width:364px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Net realized income on decommissioning trust funds /font/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 46px; text-align:left;border-color:#000000;min-width:46px;" t;#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 46px; text-align:left;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:left;border-color:#000000;min-width:40px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; 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text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"4,214/font/tdtd style="width: 20px; text-align:center;border-color:#000000;min-width:20px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"(b)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,129/font/tdtd style="width: 5px; text-alig n:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,442/font/td/trtr style="height: 17px"td colspan="3" style="width: 362px; 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text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"77/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 40px; text-align:right;border-color:#000000;min-width:40px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 1 0pt;COLOR: #000000;"117/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"___________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;"(a) Includes accumulated amortization of nuclear fuel in the reactor core of $/fontfont style="font-family:Times New Roman;font-size:10pt;"1,377 /fontfont style="font-family:Times New Roman;font-size:10pt;"million./font/pp style='margin-top:0pt; 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text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/td/trtr style="height: 8px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 47px; text-align:left;border-color:#000000;min-width:47px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 46px; text-align:left;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;" #160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/td/trtr style="height: 18px"td colspan="3" style="width: 407px; text-align:left;border-color:#000000;min-width:407px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total accumulated other comprehensive income (loss)/font/tdtd style="width: 10px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 47px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:47px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(1,695)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 46px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,708/font/tdtd style="width: 5px; text-align:left;border-color:#00 0000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 35px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 35px; border-bottom-style:double;border-bottom-width:3px;text-align:right;bord er-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1/font/td/trtr style="height: 18px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 47px; text-align:left;border-color:#000000;min-width:47px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 46px; text-align:left;border-color:#000000;min-width:46px;" ;#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/td/trtr style="height: 12px"td colspan="3" style="width: 407px; text-align:left;border-color:#000000;min-width:407px;"font style="FONT-WEIGHT: bold;TEXT-DECORATION: underline;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: left;"December 31, 2009/font/tdtd colspan="2" style="width: 57px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:57px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Exelon /font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 56px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:56px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Generation /font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 45px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:45px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #00000 0;TEXT-ALIGN: center;"ComEd /font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 45px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:45px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"PECO /font/td/trtr style="height: 17px"td colspan="3" style="width: 407px; 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text-align:left;border-color:#000000;min-width:35px;"#160;/td/trtr style="height: 17px"td colspan="3" style="width: 407px; text-align:left ;border-color:#000000;min-width:407px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Net unrealized gain on cash flow hedges/font/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 47px; text-align:right;border-color:#000000;min-width:47px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"551/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 46px; text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,157/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="widt h: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1/font/td/trtr style="height: 17px"td colspan="3" style="width: 407px; text-align:left;border-color:#000000;min-width:407px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Pension and non-pension postretirement benefit plans/font/tdtd style="width: 10px; border-bott om-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 47px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:47px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(2,640)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 46px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-st yle:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/td/trtr style="height: 8px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd st yle="width: 25px; text-align:left;border-color:#000000;min-width:25px;"#160;/tdtd style="width: 362px; text-align:left;border-color:#000000;min-width:362px;"#160;/tdtd style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 47px; text-align:left;border-color:#000000;min-width:47px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 46px; text-align:left;border-color:#000000;min-width:46px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min - -width:35px;"#160;/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"#160;/tdtd style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"#160;/td/trtr style="height: 18px"td colspan="3" style="width: 407px; text-align:left;border-color:#000000;min-width:407px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"Total accumulated other comprehensive income (loss)/font/tdtd style="width: 10px; border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 47px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-wi dth:47px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(2,089)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 46px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:46px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,157/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times N ew Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 35px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"0/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 10px; border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:10px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;"$/font/tdtd style="width: 35px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:35px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1/font/td/tr/table/div

Segment Information	3 Months Ended
Segment Information	Mar. 31, 2010
Notes to Financial Statements [Abstract]
Segment Information (Exelon, Generation, ComEd and PECO)	p style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;"14. Segment Information (Exelon, Generation, ComEd and PECO)/font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"During the first quarter of 2010, Exelon/fontfont style="font-family:Times New Roman;font-size:10pt;" and Generation/fontfont style="font-family:Times New Roman;font-size:10pt;" concluded that Generation no longer /fontfont style="font-family:Times New Roman;font-size:10pt;"operates/fontfont style="font-family:Times New Roman;font-size:10pt;" as/fontfont style="font-family:Times New Roman;font-size:10pt;" a single reportable segment/fontfont style="font-family:Times New Roman;font-size:10pt;",/fontfont style="font-family:Times New Roman;font-size:10pt;" primarily /fontfont style="font-family:Times New Roman;font-size:10pt;"due /fontfont style="font-family:Times New Roman;font-size:10pt;"to a change in the financial information regularly evaluated by the chief operating decision maker (CODM) in determining resource allocation and assessing performance. Certain regional results of Generation's power marketing activities are now being provided to the CODM /fontfont style="font-family:Times New Roman;font-size:10pt;"and in other public disclosures/fontfont style="font-family:Times New Roman;font-size:10pt;". /fontfont style="font-family:Times New Roman;font-size:10pt;"As a result, /fontfont style="font-family:Times New Roman;font-size:10pt;"beginning in the first quarter of 2010, lt;/fontfont style="font-family:Times New Roman;font-size:10pt;"Generation/fontfont style="font-family:Times New Roman;font-size:10pt;" ha/fontfont style="font-family:Times New Roman;font-size:10pt;"s /fontfont style="font-family:Times New Roman;font-size:10pt;"three /fontfont style="font-family:Times New Roman;font-size:10pt;"reportable segments/fontfont style="font-family:Times New Roman;font-size:10pt;" consisting of /fontfont style="font-family:Times New Roman;font-size:10pt;"Mid-Atlantic, Midwest and South. /fontfont style="font-family:Times New Roman;font-size:10pt;"Consequently/fontfont style="font-family:Times New Roman;font-size:10pt;", Exelon has five reportable segments/fontfont style="font-family:Times New Roman;font-size:10pt;" consisting of /fontfont style="font-family:Times New Roman;font-size:10pt;"Mid-Atlantic, Midwest ;/fontfont style="font-family:Times New Roman;font-size:10pt;" and South in Generation and/fontfont style="font-family:Times New Roman;font-size:10pt;" ComEd and PECO. Prior period presentation has been adjusted for comparative purposes. /font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"Mid-Atlantic represents Generation's operations primarily in Pennsylvania, New Jersey and Maryland; Midwest includes operations in Illinois and Indiana/fontfont style="font-family:Times New Roman;font-size:10pt;"; and South/fontfont style="font-family:Times New Roman;font-size:10pt;" includes/fontfont style="font-family:Times New Roman;font-size:10pt;" operations /fontfont style="font-family:Times New Roman;font-size:10pt;"primarily /fontfont styl e="font-family:Times New Roman;font-size:10pt;"in Texas, Georgia and Oklahoma. Exelon /fontfont style="font-family:Times New Roman;font-size:10pt;"and Generation /fontfont style="font-family:Times New Roman;font-size:10pt;"evaluate the performance of /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation's/fontfont style="font-family:Times New Roman;font-size:10pt;" power marketing activities in /fontfont style="font-family:Times New Roman;font-size:10pt;"Mid-Atlantic, Midwest and South based on revenue net of purchased power and fuel expense. /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation believes that revenue net of purchased power and fuel expense is a useful measurement of operational performance. Revenue net of purchased power and fuel expense is not a presentation defined under GAAP and may not be comparable to other companies' presentations or deemed more use ful than the GAAP information provided elsewhere in this report. Generation's operating revenues include all sales to third parties and affiliated sales to ComEd and PECO. Purchased power costs include all costs associated with the procurement of electricity including capacity, energy and fuel costs associated with tolling agreements. Fuel expense includes the fuel costs for internally/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"generated energy./fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Generation's/fontfont style="font-family:Times New Roman;font-size:10pt;" retail gas, proprietary trading, other revenue and mark-to-market activities are not al/fontfont style="font-family:Times New Roman;font-size:10pt;"located to a region./fontfont style= "font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon and Generation do not use a/fontfont style="font-family:Times New Roman;font-size:10pt;" measure of total assets in making decisions regarding allocating resources to or assessing the performance of these /fontfont style="font-family:Times New Roman;font-size:10pt;"reportable/fontfont style="font-family:Times New Roman;font-size:10pt;" segments./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"ComEd and PECO each represent a single reportable segment; as such, no separate segment information is provided for these Registrants. PECO has two operating segments, electric and gas delivery, which are aggregated into one reportable segment primarily due to their similar economic characteristics and the regulatory environments in which they operate./fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"Exelon evaluates the performance of ComEd and PECO based on net income./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:10pt;margin-left:18px;"An analysis/fontfont style="font-family:Times New Roman;font-size:10pt;" and reconciliation of /fontfont style="font-family:Times New Roman;font-size:10pt;"the Registrants'/fontfont style="font-family:Times New Roman;font-size:10pt;" /fontfont style="font-family:Times New Roman;font-size:10pt;"reportable/fontfont style="font-family:Times New Roman;font-size:10pt;" segment information to the respectiv e information in the consolidated financial statements for the three months ended March 31, 2010 and 2009 /fontfont style="font-family:Times New Roman;font-size:10pt;"is/fontfont style="font-family:Times New Roman;font-size:10pt;" as follows:/font/pp style='margin-top: 0pt; 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text-align:left;borde r-color:#000000;min-width:12px;"#160;/tdtd style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"49,180/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"__________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(a)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"Generation represents the three segments, Mid-Atlantic, /fontfont style="font-family:Times New Roman;font-size:7.5pt;"Midwest/fontfont style="font-family:Times New Roman;font-size:7.5pt;" ; and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"South/fontfont style="font-family:Times New Roman;font-size:7.5pt;",/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and Other shown below. Intersegment revenues /fontfont style="font-family:Times New Roman;font-size:7.5pt;"for the three /fontfont style="font-family:Times New Roman;font-size:7.5pt;"months ended March 31, 2010 and 2009, /fontfont style="font-family:Times New Roman;font-size:7.5pt;"represent /fontfont style="font-family:Times New Roman;font-size:7.5pt;"Mid-Atlantic revenue from sales to PECO of /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$/fontfont style="font-family:Times New Roman;font-size:7.5pt;"458/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million/fontfont style="font-family:Times New Roman;font-size: 7.5pt;" and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"505/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million, respectively,/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"Midwest/fontfont style="font-family:Times New Roman;font-size:7.5pt;" revenue from sales to ComEd/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"of /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$/fontfont style="font-family:Times New Roman;font-size:7.5pt;"369/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million/fontfont style="font-family:Times New Roman;font-size :7.5pt;" and $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"439/fontfont style="font-family:Times New Roman;font-size:7.5pt;" million, respectively/fontfont style="font-family:Times New Roman;font-size:7.5pt;"./fontfont style="font-family:Times New Roman;font-size:7.5pt;" /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(b)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"For the three months ended March 31, 2010 and 2009, utility taxes /fontfont style="font-family:Times New Roman;font-size:7.5pt;"of $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"50 /fontfont style="font-family:Times New Roman;font-size:7.5pt;"million and /fontfont style="font-family: Times New Roman;font-size:7.5pt;"$/fontfont style="font-family:Times New Roman;font-size:7.5pt;"66/fontfont style="font-family:Times New Roman;font-size:7.5pt;" /fontfont style="font-family:Times New Roman;font-size:7.5pt;"million/fontfont style="font-family:Times New Roman;font-size:7.5pt;", respectively, are included in revenues and expenses for ComEd. For the three months ended March 31, 2010 and 2009, utility taxes of $/fontfont style="font-family:Times New Roman;font-size:7.5pt;"63/fontfont style="font-family:Times New Roman;font-size:7.5pt;"#160;million/fontfont style="font-family:Times New Roman;font-size:7.5pt;" and /fontfont style="font-family:Times New Roman;font-size:7.5pt;"$/fontfont style="font-family:Times New Roman;font-size:7.5pt;"59/fontfont style="font-family:Times New Roman;font-size:7.5pt;"#160;/fontfont s tyle="font-family:Times New Roman;font-size:7.5pt;"million, respectively, are included in revenues and expenses for PECO. /font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"(c)#160;#160;#160;#160;#160;#160;#160;/fontfont style="font-family:Times New Roman;font-size:7.5pt;"The intersegment profit associated with Generation's sale of AECs to PECO is not eliminated in consolidation due to the recognition of intersegment profit /fontfont style="font-family:Times New Roman;font-size:7.5pt;"in accordance with regulatory accounting guidance./fontfont style="font-family:Times New Roman;font-size:7.5pt;" See /fontfont style="font-family:Times New Roman;font-size:7.5pt;"Note 2/fontfont style="font-family:Times New Roman;font-size:7.5pt;" of/fontfont style="font-family:Times New Roman;fon t-size:7.5pt;" the 2009 Form 10-K /fontfont style="font-family:Times New Roman;font-size:7.5pt;"for/fontfont style="font-family:Times New Roman;font-size:7.5pt;" additional information on AECs./fontfont style="font-family:Times New Roman;font-size:7.5pt;" For Exelon, these amounts are included in operating revenues in the Consolidated Statements of Operation/fontfont style="font-family:Times New Roman;font-size:7.5pt;"s./font/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pdivtable style="border-collapse:collapse;margin-top:20px;"tr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 164px; text-align:left;border-color:#000000;min-width:164px;"#160;/tdtd colspan="2" style="width: 97px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:# 000000;min-width:97px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Mid-Atlantic/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 76px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:76px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Midwest/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 77px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:77px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"South/font/tdtd style="width: 5px; text-al ign:left;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 77px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:77px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Other(b)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd colspan="2" style="width: 93px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:93px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 7.5pt;COLOR: #000000;TEXT-ALIGN: center;"Generation/font/td/trtr style="height: 17px"td colspan="16" style="width: 624px; text-align:left;border-color:#000000;min-width:624px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN : left;"Total revenues(a):/font/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 164px; text-align:right;border-color:#000000;min-width:164px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"2010/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 85px; text-align:right;border-color:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"780/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"font style="FONT-FAMILY : Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,351/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"148/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COL OR: #000000;"$/font/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"142/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 81px; text-align:right;border-color:#000000;min-width:81px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,421/font/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 164px; text-align:right;border-color:#000000;min-width:164px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE : 10pt;COLOR: #000000;TEXT-ALIGN: left;"2009/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 85px; text-align:right;border-color:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"854/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"#160;/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,451/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"175/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"121/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 81px; text-align:right;border-color:#000000;min-width:81px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"2,601/font/td/trtr style="height: 17px" t;td colspan="16" style="width: 624px; text-align:left;border-color:#000000;min-width:624px;"font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"Revenues net of purchased power and fuel expense:/font/td/trtr style="height: 17px"td style="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 164px; text-align:right;border-color:#000000;min-width:164px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"2010/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 85px; text-align:right;border-color:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"613/ font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"994/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(47)/font/tdtd style="wid th: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"262/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"$/font/tdtd style="width: 81px; text-align:right;border-color:#000000;min-width:81px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,822/font/td/trtr style="height: 17px"td style ="width: 20px; text-align:left;border-color:#000000;min-width:20px;"#160;/tdtd style="width: 164px; text-align:right;border-color:#000000;min-width:164px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;"2009/font/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 85px; text-align:right;border-color:#000000;min-width:85px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"694/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"#160;/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,075/font/td td style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"(33)/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/tdtd style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"180/font/tdtd style="width: 5px; text-align:left;border-color:#000000;min-width:5px;"#160;/tdtd style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"#160;/td td style="width: 81px; text-align:right;border-color:#000000;min-width:81px;"font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;"1,916/font/td/tr/table/divp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top: 0pt; margin-bottom: 0pt;'/pp style='margin-top:12pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:7.5pt;margin-left:0px;"__________/font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:8.5pt;margin-left:0px;"(a) /fontfont style="font-family:Times New Roman;font-size:8.5pt;"Includes/fontfont style="font-family:Times New Roman;font-size:8.5pt;" all sales to third parties and affiliated sales to ComEd and PECO. For the three months ended March 31, 2010 and 2009, there were no transactions among Generation's reportable segments, whic h would result in intersegment revenue for Generation./font/pp style='margin-top:0pt; margin-bottom:0pt'font style="font-family:Times New Roman;font-size:8.5pt;margin-left:0px;"(b) Includes retail gas, proprietary trading, other revenue and mark-to-market activities as well as amounts paid related to the Illinois Settlement Legislation./font/pp style='margin-top:0pt; margin-bottom:0pt'#160;/p

Document Information	3 Months Ended
Document Information	Mar. 31, 2010
Document Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2010

Entity Information shares in Millions	3 Months Ended
Entity Information shares in Millions	Mar. 31, 2010 shares
Entity Information [Line Items]
Trading Symbol	EXC
Entity Registrant Name	EXELON CORP
Entity Central Index Key	0001109357
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	660,578,698
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2010
EXELON GENERATION CO LLC
Entity Information [Line Items]
Entity Registrant Name	EXELON GENERATION CO LLC
Entity Central Index Key	0001168165
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	0
COMMONWEALTH EDISON CO
Entity Information [Line Items]
Entity Registrant Name	COMMONWEALTH EDISON CO
Entity Central Index Key	0000022606
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	127,016,519
PECO ENERGY CO
Entity Information [Line Items]
Entity Registrant Name	PECO ENERGY CO
Entity Central Index Key	0000078100
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	170,478,507