UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                   FORM U-9C-3

                      QUARTERLY REPORT PURSUANT TO RULE 58

                       FOR THE QUARTER ENDED June 30, 2004

                               Exelon Corporation

                            10 South Dearborn Street
                                   37th Floor
                                 P.O. Box 805379
                             Chicago, IL 60680-5379









Inquiries concerning this Form U-9C-3
   should be directed to:                            Scott Peters
                                                     Exelon Corporation
                                                     10 South Dearborn Street
                                                     38th Floor
                                                     P.O. Box 805379
                                                     Chicago, IL 60680-5379


TABLE OF CONTENTS Item Page Number Number 1 Organization Chart 3 2 Issuances and Renewals of Securities and Capital Contributions 6 3 Associate Transactions Part I - Transactions Performed by Reporting Companies on Behalf of Associate Companies 7 Part II - Transactions Performed by Associate Companies On Behalf of Reporting Companies 7 4 Summary of Aggregate Investment 8 5 Other Investments 9 6 Financial Statements and Exhibits 10 Signature 13 2

ITEM 1. ORGANIZATION CHART - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Energy or State of Date of % Voting Name of Reporting Company Gas-Related Organization Organization Securities Nature of Business - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Corporation (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Energy Delivery Company, LLC (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Commonwealth Edison Company (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Commonwealth Research Corporation * Energy Illinois 06/08/1976 100% Energy-related (Category 1,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- PECO Energy Company (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- East Coast Natural Gas Cooperative, LLC Energy Delaware 03/15/1995 41.12% Energy-related (Category 9) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Horizon Energy Company * Energy Pennsylvania 02/06/1995 100% Energy-related (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Ventures Company, LLC (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Synfuel I, LLC Energy Delaware 07/25/2003 100% Energy-related (Category 6) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- DTE Buckeye, LLC Energy -0-% Energy-related (Category 6) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Synfuel I1, LLC Energy Delaware 07/25/2003 100% Energy-related (Category 6) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- DTE Belews Creek, LLC Energy -0-% Energy-related (Category 6) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Synfuel III, LLC (new) Energy Delaware 06/17/2004 100% Energy-related (Category 6) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- DTE Buckeye, Carbontronics Synfuels Energy -0-% Energy-related Investors, (Category 6) L.P. (new) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Generation Company, LLC (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Penesco Company, LLC Energy Delaware 06/06/2001 100% Energy-related (Category 7,9) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Cenesco Company, LLC Energy Delaware 12/31/2001 100% Energy-related (Category 7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- ExTex Retail Services Company, LLC Energy Delaware 05/12/2003 100% Energy-related (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Allowance Management Company, LLC Energy Delaware 11/08/2001 100% Energy-related (Category 2) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Power Labs, LLC Energy Pennsylvania 11/08/2002 100% Energy-related (Category 7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon AOG Holding # 1, Inc. (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon AOG Holding # 2, Inc. (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon New England Power Marketing, LP Energy Delaware 03/24/1999 100% Energy-related (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon New England Holdings, LLC (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- ENEH Services, LLC (new) Energy Delaware 04/01/2004 100% Energy-related (Category 7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Hamilton, LLC Energy Delaware 03/31/1999 100% Energy-related (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon SHC, Inc. (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Keystone Fuels, LLC Energy Delaware 10/17/2000 20.99% Energy-related (Category 9) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Conemaugh Fuels, LLC Energy Delaware 10/16/2002 20.72% Energy-related (Category 9) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- ExTex Marketing, LLC Energy Delaware 05/13/2002 100% Energy-related (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- ExTex Power, LP Energy Delaware 05/13/2002 99% Energy-related (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Energy Company Energy Delaware 01/04/1999 100% Energy-related (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- AllEnergy Gas & Electric Marketing Energy Delaware 09/12/2000 100% Energy-related Company, LLC (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Texas-Ohio Gas, Inc. Energy Texas 08/12/1987 100% Energy-related (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Enterprises Company, LLC (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Services, Inc. Energy Delaware 07/13/1999 100% Energy-related (Category 1, 2,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Unicom Power Holdings, LLC Energy Delaware 03/23/1999 100% Energy-related (Category 7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Unicom Power Marketing Inc. Energy Delaware 07/28/1997 100% Energy-related (Category 5) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Enterprises Management, Inc. (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- ECPH, LLC (a) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Enterprises Investments, (a) Inc. - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- UTECH Climate Challenge Fund, Energy Delaware 06/30/1995 24.4% Energy-related L.P. (Category 2) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Adwin Equipment Company Energy Pennsylvania 08/05/1968 100% Energy-related (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Thermal Holdings, Inc. Energy Delaware 08/05/1997 100% Energy-related (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Exelon Thermal Development, Inc. Energy Delaware 02/05/1997 100% Energy-related (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- ETT Boston Inc. Energy Delaware 12/22/1995 100% Energy-related (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Northwind Boston LLC Energy Massachusetts 01/05/1996 25% Energy-related (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- ETT Houston Inc. Energy Delaware 02/05/1997 100% Energy-related (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- ETT North America Inc. Energy Delaware 07/18/1996 100% Energy-related (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Northwind Thermal Technologies Energy Canada 08/01/1996 100% Energy-related Canada Inc. (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- ETT Canada, Inc. Energy Canada 08/01/1996 100% Energy-related (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- Northwind Windsor Energy Canada 07/18/1996 50% Energy-related (Category 6,7) - ------------------------------------------------- --------- ------------- ------------- ---------- ------------------------- * Denotes inactive corporation. (a) Directly or indirectly holds securities in energy-related companies. 3

Item 1 ORGANIZATION CHART - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- Name of Reporting Company Energy or State of Date of % Voting Gas-Related Organization Organization Securities Nature of Business - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- ETT Nevada Inc. Energy Nevada 10/30/1997 100% Energy-related (Category 6,7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- Northwind Aladdin LLC Energy Nevada 10/28/1997 75% Energy-related (Category 6,7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- F&M Holdings Company, LLC Energy Delaware 09/18/2003 100% Energy-related (Category 1,4,7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- II Services, Inc. Energy Delaware 05/28/1999 100% Energy-related (Category 1,2,7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- EIS Engineering, Inc* Energy Delaware 12/11/2000 100% Energy-related (Category 7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- InfraSource Field Services, Energy Oklahoma 11/23/1998 100% Energy-related (Category 7) LLC* - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- Fischbach and Moore Electric, Inc. Energy Delaware 08/12/1999 100% Energy-related (Category 1,2,7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- Rand-Bright Corporation* Energy Wisconsin 02/11/1985 100% Energy-related (Category 7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- NEWCOSY, Inc Energy Delaware 08/12/1999 100% Energy-related (Category 1,2,7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- NEWCOTRA, Inc. Energy Delaware 08/12/1999 100% Energy-related (Category 7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- Fishbach and Moore, Inc. Energy New York 04/01/1924 100% Energy-related (Category 7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- Fishbach and Moore Electrical Energy Delaware 07/22/1946 100% Energy-related (Category 7) Contracting, Inc. - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- T.H. Green Electric Co., Inc. Energy New York 07/06/1926 100% Energy-related (Category 7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- OSP Servicios S.A. de C.V. * Energy Mexico 09/30/1996 100% Energy-related (Category 7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- Universal Network Development Energy California 01/01/1901 49% Energy-related (Category 7) Corp. - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- Oldco VSI Inc. Energy Delaware 04/20/2000 100% Energy-related (Category 1,2,7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- EGW Meter Services, LLC Energy Delaware 12/01/2002 100% Energy-related (Category 1,2,7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- EIS Investments, LLC * Energy Delaware 11/14/2000 100% Energy-related (Category 7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- WCB Services, LLC* Energy Oklahoma 1/1/192001 49% Energy-related (Category 7) - -------------------------------------------------- --------- ------------- ------------- ---------- ----------------------------- * Denotes inactive corporation (a) Directly and / or indirectly holds securities in energy-related companies. Notes: 1. The following companies were sold during the first six months of 2004: Solution Holdings, LLC sold on 6/25/2004. Exelon Services Federal Group, Inc. sold on 6/25/2004. Thermal Chicago Corporation sold on 6/30/2004. Northwind Chicago, LLC sold on 6/30/2004. Exelon Thermal Technologies, Inc. sold on 6/30/2004. Northwind Midway, LLC sold on 6/30/2004. ETT National Power, Inc. sold on 6/30/2004. 2. The following name changes occurred during the first six months of 2004: None. 3. The following new companies were formed in the first six months of 2004: ENEH Services, LLC, a Rule 58 (vii) company, formation in Delaware on 4/1/2004. Solution Holdings, LLC, formation in Delaware on 5/13/2004. Exelon Synfuel III, LLC, a Rule 58 (vi) company formed in Delaware on 6/17/2004. 4. The following companies were dissolved during the first six months of 2004: Northwind Las Vegas, LLC dissolved 2/25/2004. 5. The following companies were acquired during the first six months of 2004: Carbontronics Synfuels Investors, L.P., 16.65% acquired by Exelon Synfuel III, LLC on 6/17/2004. 4

6. The following restructuring occurred in the first six months of 2004: Exelon Energy Company --------------------- Effective January 1, 2004, Exelon contributed its interest in Exelon Energy Company to Generation. The transaction had no impact on the assets and liabilities of Exelon Energy Company, which were previously reported as a part of the Enterprises segment. Beginning in 2004, Exelon Energy Company's assets and liabilities and results of operations are included in Generation's financial statements. The following summary represents the assets and liabilities of Exelon Energy Company that were transferred to Generation as of January 1, 2004: - -------------------------------------------------------------------------------- (in millions) Current assets $ 89 Property, plant and equipment 2 Deferred debits and other assets 13 Current liabilities 96 Deferred credits and other liabilities 10 Accumulated other comprehensive loss 2 Member's equity (4) Solution Holdings, LLC ---------------------- To facilitate a sale of Rule 58 assets, certain operating units of Exelon Services, Inc. were transferred to Solution Holdings, LLC, a newly organized Rule 58 company (Delaware on 5/13/2004). Solution Holdings, LLC was then sold on 6/25/2004. The following summary represents the assets and liabilities of Exelon Services, Inc. that were transferred to Solution Holdings, LLC: - -------------------------------------------------------------------------------- (in millions) Current assets $ 7 Property, plant and equipment 1 Deferred debits and other assets 7 Current liabilities 11 Deferred credits and other liabilities 2 Member's equity 2 5

ITEM 2. ISSUANCES AND RENEWALS OF SECURITIES AND CAPITAL CONTRIBUTIONS (in thousands of dollars) - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Company Principal Person to Issuing Type of Amount of Issue or Whom Security Collateral Consideration Securities Security Security Renewal Cost of Was Issued Given With Received For (Borrower) Issued Capital (Lender) Security Each Security - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- II Services, Revolving $52 NA LIBOR plus 50 F&M Holdings None $53 Inc. credit basis points Company, LLC - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Revolving 7,000 NA LIBOR plus 50 Exelon None 7,000 Services, Inc. credit basis points Enterprises Company, LLC - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Revolving 200 NA LIBOR plus 50 Exelon None 200 Thermal credit basis points Thermal Development, Holdings, Inc. Inc. - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Revolving 1,500 NA LIBOR plus 50 Exelon None 1,500 Thermal credit basis points Thermal Technologies, Holdings, Inc. Inc. - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Fischbach & Revolving 500 NA LIBOR plus 50 Enterprises None 500 Moore credit basis points Electric, Inc. - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Revolving 250 NA LIBOR plus Exelon None 250 PowerLabs, LLC credit .625% Generation Finance Company - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Capital Contributions: - ------------------------------------------- ---------------------------------------- ---------------------------------------- Company Contributing Capital Company Receiving Capital Amount of Capital Contribution - ------------------------------------------- ---------------------------------------- ---------------------------------------- ECPH, LLC Exelon Enterprises Investments, Inc. $9,700,000 - ------------------------------------------- ---------------------------------------- ---------------------------------------- Exelon Thermal Holdings, Inc. Northwind Chicago, LLC 38,466,552 - ------------------------------------------- ---------------------------------------- ---------------------------------------- Exelon Ventures Company, LLC Exelon Synfuel I, LLC 27,767,500 - ------------------------------------------- ---------------------------------------- ---------------------------------------- Exelon Ventures Company, LLC Exelon Synfuel II, LLC 22,199,800 - ------------------------------------------- ---------------------------------------- ---------------------------------------- Exelon Ventures Company, LLC Exelon Synfuel III, LLC 1,000,000 - ------------------------------------------- ---------------------------------------- ---------------------------------------- 6

ITEM 3. ASSOCIATE TRANSACTIONS Part I. Transactions Performed by Reporting Companies on Behalf of Associate Companies - ------------------------------------------------------------------------------------------------------------------------- Types of Direct Reporting Company Associate Company Services Costs Indirect Costs Cost of Total Amount Rendering Services Receiving Services Rendered Charged Charged Capital Billed - ------------------------------------------------------------------------------------------------------------------------- (thousands of dollars) - ------------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Business Security System 49 $49 Services Company - ------------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Energy IT 102 102 Company Services/Facility Charges - ------------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon IT 23 23 Enterprises Services/Facility Company, LLC Charges - ------------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Commonwealth Security System 16 16 Edison Company - ------------------------------------------------------------------------------------------------------------------------- Exelon Services PECO Energy Construction / 2,125 2,125 Federal Group, Inc. Company Project Management - ------------------------------------------------------------------------------------------------------------------------- Exelon Thermal Northwind Aladdin Plant Operators 72 72 Development, Inc. LLC - ------------------------------------------------------------------------------------------------------------------------- Exelon Thermal Northwind Aladdin Administrative 2 2 Technologies, Inc. LLC and General - ------------------------------------------------------------------------------------------------------------------------- Exelon Thermal Northwind Aladdin Plant Management 34 34 Technologies, Inc. LLC - ------------------------------------------------------------------------------------------------------------------------- Exelon Thermal Northwind District Cooling 255 255 Technologies, Inc. Chicago, LLC - ------------------------------------------------------------------------------------------------------------------------- Exelon Thermal Northwind Chicago Plant Operators 145 145 Technologies, Inc. LLC - ------------------------------------------------------------------------------------------------------------------------- Exelon Thermal Northwind Chicago Rent 27 27 Technologies, Inc. LLC - ------------------------------------------------------------------------------------------------------------------------- Exelon Thermal Northwind Midway Plant Operators 179 179 Technologies, Inc. LLC - ------------------------------------------------------------------------------------------------------------------------- Exelon Thermal Northwind Chicago Administrative 3 3 Technologies, Inc. LLC and General - ------------------------------------------------------------------------------------------------------------------------- Northwind Chicago, LLC Exelon Thermal Cooling 1,440 1,440 Technologies, Inc. - ------------------------------------------------------------------------------------------------------------------------- Exelon Thermal Northwind Midway Administrative 1 1 Technologies, Inc. LLC and general - ------------------------------------------------------------------------------------------------------------------------- Exelon Power Labs, LLC Exelon Generation Measuring & test 1,487 192 1,679 Company, LLC equipment, technical services - ------------------------------------------------------------------------------------------------------------------------- Exelon Power Labs, LLC Exelon Energy Measuring & test 169 120 288 Company equipment, technical services - ------------------------------------------------------------------------------------------------------------------------- Part II. Transactions Performed by Associate Companies on Behalf of Reporting Companies - ------------------------------------------------------------------------------------------------------------------------ Types of Associate Company Reporting Company Services Direct Costs Indirect Costs Cost of Total Amount Rendering Services Receiving Services Rendered Charged Charged Capital Billed - ------------------------------------------------------------------------------------------------------------------------ (thousands of dollars) - ------------------------------------------------------------------------------------------------------------------------ Exelon Business F&M Holdings Legal 233 $233 Services Company Company - ------------------------------------------------------------------------------------------------------------------------ Exelon Enterprises Exelon Thermal Payroll - 111 111 Company, LLC Technologies, Inc. Executive - ------------------------------------------------------------------------------------------------------------------------ Exelon Business F&M Holdings Legal, IT and 9 9 Services Company Company accounting - ------------------------------------------------------------------------------------------------------------------------ Exelon Business Exelon Thermal Legal 195 195 Services Company Technologies, Inc. - ------------------------------------------------------------------------------------------------------------------------ Commonwealth Edison Exelon Thermal Electric 1,214 1,214 Company Technologies, Inc. - ------------------------------------------------------------------------------------------------------------------------ Commonwealth Edison Exelon Services Management fee 91 91 Company Federal Group, Inc. - ------------------------------------------------------------------------------------------------------------------------ PECO Exelon Services Design study 7 7 Federal Group, Inc. - ------------------------------------------------------------------------------------------------------------------------ 7

ITEM 4. SUMMARY OF AGGREGATE INVESTMENT June 30, 2004 (in thousands) Investments in energy-related companies: Total consolidated capitalization of Exelon Corporation as of June 30, 2004 $24,001,000 Line 1 Total capitalization multiplied by 15% (line 1 multiplied by 0.15) 3,600,150 Line 2 Greater of $50 million or line 2 3,600,150 Line 3 Total current aggregate investment subsequent to October 20, 2000 (categorized by major line of energy-related business): Energy-related business category 2 $167,431 Energy-related business category 5 216,722 Energy-related business category 6 95,176 Energy-related business category 7 351,485 Energy-related business category 9 6,349 Energy-related business category 10 32 Total current aggregate investment 837,194 Line 4 ---------- Difference between the greater of $50 million or 15% of capitalization and the total aggregate investment of the registered holding company system (line 3 less line 4) $2,762,956 Line 5 ========== Investments in gas-related companies: NONE 8

ITEM 5. OTHER INVESTMENTS Filed under confidential treatment pursuant to Rule 104(b). 9

ITEM 6 - FINANCIAL STATEMENTS AND EXHIBITS Financial Statements - -------------------- (1) Exhibit A-1 Statement of Income of Exelon Services, Inc. for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (2) Exhibit A-2 Balance Sheet of Exelon Services, Inc. at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (3) Exhibit A-3 Statement of Income of Exelon Thermal Holdings, Inc. for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (4) Exhibit A-4 Balance Sheet of Exelon Thermal Holdings, Inc. at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (5) Exhibit A-5 Statement of Income of Unicom Power Holdings, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (6) Exhibit A-6 Balance Sheet of Unicom Power Holdings, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (7) Exhibit A-7 Statement of Income of Unicom Power Marketing, Inc. for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (8) Exhibit A-8 Balance Sheet of Unicom Power Marketing, Inc. at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (9) Exhibit A-9 Statement of Income of Adwin Equipment Company for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (10) Exhibit A-10 Balance Sheet of Adwin Equipment Company at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (11) Exhibit A-11 Statement of Income of F&M Holdings Company, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (12) Exhibit A-12 Balance Sheet of F&M Holdings Company, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (13) Exhibit B-1 Statement of Income of Penesco Company, LLC for three months and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (14) Exhibit B-2 Balance Sheet of Penesco Company, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (15) Exhibit B-3 Statement of Income of Cenesco Company, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (16) Exhibit B-4 Balance Sheet of Cenesco Company, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (17) Exhibit B-5 Statement of Income of Exelon Allowance Management Company, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). 10

(18) Exhibit B-6 Balance Sheet of Exelon Allowance Management Company, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (19) Exhibit B-7 Statement of Income of ExTex Marketing, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (20) Exhibit B-8 Balance Sheet of ExTex Marketing, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (21) Exhibit B-9 Statement of Income of Exelon New England Power Marketing LP for the three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (22) Exhibit B-10 Balance Sheet of Exelon New England Power Marketing LP at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (23) Exhibit B-11 Statement of Income of Exelon Hamilton, LLC for the three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (24) Exhibit B-12 Balance Sheet of Exelon Hamilton, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (25) Exhibit B-13 Statement of Income of Exelon Energy Company for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (26) Exhibit B-14 Balance Sheet of Exelon Energy Company at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (27) Exhibit B-15 Statement of Income of Exelon PowerLabs, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (28) Exhibit B-16 Balance Sheet of Exelon PowerLabs, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (29) Exhibit B-17 Statement of Income of ENEH Services, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (30) Exhibit B-18 Balance Sheet of ENEH Services, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (31) Exhibit B-19 Statement of Income of ExTex Retail Services Company, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (32) Exhibit B-20 Balance Sheet of ExTex Retail Services Company, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (33) Exhibit C-1 Statement of Income of Exelon Synfuel I, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (34) Exhibit C-2 Balance Sheet of Exelon Synfuel I, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (35) Exhibit C-3 Statement of Income of Exelon Synfuel II, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (36) Exhibit C-4 Balance Sheet of Exelon Synfuel II, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). 11

(37) Exhibit C-5 Statement of Income of Exelon Synfuel III, LLC for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (38) Exhibit C-6 Balance Sheet of Exelon Synfuel III, LLC at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (39) Exhibit C-7 Statement of Income of Commonwealth Research Corporation for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (40) Exhibit C-8 Balance Sheet of Commonwealth Research Corporation at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (41) Exhibit C-9 Statement of Income of Horizon Energy Company for three and six months ended June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). (42) Exhibit C-10 Balance Sheet of Horizon Energy Company at June 30, 2004 - filed under confidential treatment pursuant to Rule 104(b). 12

SIGNATURE Pursuant to the requirements of the Public Utility Holding Company Act of 1935, Exelon Corporation has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. Date: August 30, 2004 Exelon Corporation Registrant By:/s/ Matthew F. Hilzinger --------------------------- Vice President and Corporate Controller With the above signature, I also hereby certify that the corresponding report on Form U-9C-3 for the second quarter of 2004 has been filed with Exelon Corporation's interested state commissions whose names and addresses are listed below. Donna Caton, Chief Clerk Illinois Commerce Commission 527 East Capitol Avenue Springfield, Illinois 62706 James J. McNulty, Secretary Pennsylvania Public Utility Commission P.O. Box 3265 Harrisburg, Pennsylvania 17105-3265 13