SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549






                                    FORM U5S






                                  ANNUAL REPORT

                      For the Year Ended December 31, 2000



       Filed pursuant to the Public Utility Holding Company Act of 1935 by










                               EXELON CORPORATION
                            10 South Dearborn Street
                                   37th Floor
                             Chicago, Illinois 60603


                            PECO ENERGY POWER COMPANY
                               2301 Market Street
                        Philadelphia, Pennsylvania 19101

Glossary of Defined Terms ComEd Commonwealth Edison Company Commission Securities and Exchange Commission Exelon Enterprises Exelon Enterprises Company, LLC Exelon Exelon Corporation Exelon Generation Exelon Generation Company, LLC Financing U-1 The Form U-1 Application/Declaration filed by Exelon Corporation in File No. 70-9693 Merger U-1 The Form U-1 Application/Declaration filed by Exelon Corporation in File No. 70-9645 N/A Not applicable or not available PECO PECO Energy Company PEPCO PECO Energy Power Company Unicom Unicom Corporation 1

ITEM 1. SYSTEM COMPANIES AND INVESTMENTS THEREIN. The Corporate structure shown is as of April 18, 2001, reflecting corporate restructuring undertaken between January 1, 2001 and April 18, 2001. Owner's book value is as of December 31, 2000. Name of Company Number of Common % Voting Power Owner's Book Shares Owned Value ($000) - ---------------------------------------------------------------------------------------------------------- Exelon Corporation 100% (Affordable Housing Investments) 92,082 Boston Financial Institutional Tax Credit Fund X - 11% Related Corporate Partners IV, L.P. - <5% Boston Financial Institutional Tax Credit Fund XIX - 14% Related Corporate Partners XII, L.P. - 36% Boston Financial Institutional Tax Credit Fund XIV - 44% Boston Financial Institutional Tax Credit Fund XXI - 27% Related Corporate Partners XIV, L.P. - 16% Summit Corporate Tax Credit Fund II - 33% USA Institutional Tax Credit Fund XXII - 30% Exelon Energy Delivery Company, LLC 100% Commonwealth Edison Company 190,000 <100% 5,933,000 Commonwealth Edison Company of Indiana, Inc. 1,108,084 100% 30,917 ComEd Financing I - 100% 15,630 ComEd Financing II - 100% 8,671 ComEd Funding, LLC - 100% 86,536 ComEd Transitional Funding Trust - 100% Commonwealth Research Corporation 200 100% 200 Edison Development Company 741 100% 16,585 Edison Development Canada Inc. 2,600 100% 5,499 Edison Finance Partnership - 100% PECO Energy Company 100% PECO Energy Capital Corp. 1,000 100% 17,640 PECO Energy Capital, LP 3% 13,968 PECO Energy Capital Trust II 100% PECO Energy Capital Trust III 100% PECO Energy Transition Trust 100% 149,901 ExTel, LLC 100% (1,215) PECO Wireless, LP 99% PECO; (120,239) 1% Extel ATNP Finance Company 100% 4,324,366 PEC Financial Services, LLC 100% 12,918 Adwin Realty Company 1,000 100% 22,628 Ambassador II Joint Venture 50% Bradford Associates 50% Franklin Town Towers Associates 50% Henderson Ambassador Associates 50% Riverwatch Associates 100% Route 724 100% East Coast Natural Gas Cooperation, LLP 41.12% PECO Hyperion Telecommunications 1% (1,380) Horizon Energy Company 1,000 100% Unicom Invesment Inc. 100 100% Scherer Holdings 1, LLC - 100% 49,002 Scherer Holdings 2, LLC - 100% 24,992 Scherer Holdings 3, LLC - 100% 73,989 Spruce Holdings G.P. 2000, LLC - 100% 1,841 Spruce Holdings L.P. 2000, LLC - 100% 182,231 Spruce Equity Holdings, L.P. - 1% Spr GP; 184,072 99% Spr LP Spruce Holdings Trust - 100% 184,072 Wansley Holdings 1, LLC - 100% 41,941 Wansley Holdings 2, LLC - 100% 21,387 Unicom Resources Inc. 100 100% (13,842) Exelon Ventures Company, LLC 100% Exelon Generation Company, LLC 100% 4,551,000 PECO Energy Power Company 984,000 100% 24,600 Susquehanna Power Company 1,273,000 100% 47,047 The proprietors of the Susquehanna Canal 100% N/A Susquehanna Electric Company 1,000 100% 10,000 AmerGen Energy Company, LLC 50% AmerGen Venture, LLC 100% Exelon (Fossil) Holdings, Inc. 100% Sithe Energies, Inc. 49.90% Exelon Peaker Development General, LLC 100% N/A Exelon Peaker Development Limited, LLC 100% N/A ExTex LaPorte Limited Partnership 1% EP Gen N/A 99% EP Lim N/A Concomber Ltd 100% 1,200 Exelon Enterprises Company, LLC 100 100% 873,519,290 2

Exelon Energy Company 100 100% (21,642) Exelon Energy Ohio, Inc. 1,000 100% 13,942 AllEnergy Gas & Electric Marketing Company, LLC N/A 100% 22,850 Texas Ohio Gas, Inc. 100% (403) Exelon Services, Inc. 100 100% 33,548 Systems Engineering and Management Corporation, Inc 874 100% 7,107 Unicom Power Holdings, Inc. 100 100% (16,017) Unicom Power Marketing, Inc. 100 100% N/A Unicom Healthcare Management, Inc. 1,110 100% 230 UT Holdings, Inc. 100 100% (142,328) Northwind Chicago, LLC N/A 100% (5,649) Unicom Thermal Development, Inc. 100 100% (4,685) Exelon Thermal Technologies, Inc. 100 100% (81,511) Exelon Thermal Technologies Boston, Inc. 100 100% (4,311) Northwind Boston, LLC N/A 25% (11,552) Exelon Thermal Technologies Houston, Inc. 100 100% (766) Northwind Houston, LLC N/A 25% 128 Northwind Houston, LP N/A 25% 13,635 Exelon Thermal Technologies North America, Inc. 10 100% (3,068) Northwind Thermal Technologies Canada, Inc. 10 100% (1,801) Unicom Thermal Technologies Canada, Inc. 10 100% (1,011) UTT National Power, Inc. 100 100% (546) Northwind Midway, LLC N/A 100% N/A UTT Nevada, Inc. 100 100% (177) Northwind Aladdin, LLC N/A 75% 12,000 Northwind Las Vegas, LLC N/A 50% 349 UTT Phoenix, Inc. 100 100% N/A Northwind Arizona Development, LLC N/A 50% N/A Northwind Phoenix, LLC N/A 50% N/A Exelon Communications Holdings, LLC 100% 439,163 AT&T Wireless PCS of Philadelphia, LLC 49% PHT Holdings, LLC 100% 56,620 PECO Hyperion Telecommunications 49% Exelon Communications Company, LLC 100% 149,287 Energy Trading Company 100% 744 Exelon Enterprises Management, Inc. 100% 95,600 UniGridEnergy, LLC 50% CIC Global, LLC 50% NEON Communications, Inc. 10% VITTS Network Group, Inc. 20% Exelon Capital Partners, Inc. 100% 32,966 Permits Now (fka Softcomp) 16% OmniChoice.com, Inc. 30% Enertech Capital Partners II 11% Everest Broadband Networks 15% Exelon Infrastructure Services, Inc. <100% 515,266 Exelon Infrastructure Services of Pennsylvania, Inc. 100% 6,938 EIS Engineering, Inc. 100% P.A.C.E Field Services, LLC 100% 8,135 P.A.C.E Environmental, LLC 100% Chowns Communication, Inc. N/A 100% 11,893 Fischbach and Moore Electric, Inc. N/A 100% MRM Technical Group, Inc. N/A 100% 121,556 Aconite Corporation 100% Gas Distribution Contractors, Inc. 100% Mid-Atlantic Pipeliners, Inc. 100% Mueller Distribution Contractors, Inc. 100% Mueller Energy Services, Inc. 100% Mueller Pipeliners, Inc. 100% Mechanical Specialties Incorporated 100% Rand-Bright Corporation 100% Syracuse Merit Electric, Inc. N/A 100% 15,297 NEWCOTRA, Inc. N/A 100% Fischbach and Moore, Inc. 100% 7,001 Fischbach and Moore Electrical Contractors, Inc. 100% T.H. Green Electric Co., Inc. 100% Trinity industries, Inc. N/A 100% 11,322 OSP Consultants, Inc. N/A 100% 68,116 International Communications Services, Inc. 100% OSP, Inc. 100% OSP Servicios, S.A. de C.V. 100% OSP Telecom, Inc. 100% OSP Telcomm de Mexico, S.A. de C.V. 100% OSP Telcom de Columbia, LTDA 100% OSP Telecommunications, Ltd. 100% RJE Telecom, Inc. 100% Utilities Locate & Mapping Services, Inc. 100% Universal Network Services, Inc. 49% Dashiell Holdings Corporation N/A 100% 68,215 Dashiell Corporation 100% Dacon Corporation 100% VSI Group, Inc. N/A 100% 19,307 International Vital Solutions Group, Inc. 100% Michigan Trenching Services, Inc. N/A 100% 14,994 Lyons Equipments, Inc. N/A 100% M.J. Electric, Inc. 100% 143,906 Electric Services, Inc. 100% 7,443 EIS Investments, LLC 100% WCB Services, LLC 49% Adwin Equipment Company N/A 100% 16,732 Kinetic Ventures Fund I, LLC 22.22% Kinetic Ventures Fund II, LLC 17.64% Unicom Assurance Company Ltd. (Inactive) N/A 100% N/A N/A Not applicable or Not Available Issuer book value is subject to a final determination. 3

ITEM 2. ACQUISITIONS OR SALES OF UTILITY ASSETS NONE ITEM 3. ISSUE, SALE, PLEDGE, GUARANTEE OR ASSUMPTION OF SYSTEM SECURITIES None in addition to those reported in the Rule 24 certificate filed on April 2, 2001. ITEM 4. ACQUISITION, REDEMPTION OR RETIREMENT OF SYSTEM SECURITIES A. PECO Energy Company - Debt Retirements 1. On November 14, 2000, PECO retired, with cash, upon maturity, its $38.5 million principal amount variable rate note. B. Commonwealth Edison Company - Redemption of Securities 1. In the fourth quarter of 2000, ComEd repurchased 19.9 million of its common shares from Unicom in exchange for an $850 million note receivable ComEd held from Unicom Investment, Inc. C. Exelon Enterprise's Acquisitions (filed confidentially herewith on Form SE) ITEM 5. INVESTMENTS IN SECURITIES OF NON-SYSTEM COMPANIES AS OF DECEMBER 31,2000. Investor Investee Type Quantity Cost Carrying Value - ---------------------------------------------------------------------------------------------------------------------------------- ComEd Chicago Community Ventures, Inc. Common Shares 500 $50,000 $50,000 ComEd Chicago Equity Fund Limited Partnership N/A $1,390,514 $1,390,514 ComEd Dearborn Park Corporation Common Shares 10,000 $537,654 $537,654 ComEd I.L.P. Fund C/O Chicago Capital Fund Venture Capital Small N/A $250,000 $250,000 Business Fund ComEd Illinois Venture Fund (Unibanc Trust) Venture Capital Fund N/A $71,320 $71,320 4

Exelon Phoenix Foods, LLC Limited Liability Enterprise Company N/A Management, Inc Exelon Pantellos Corporation Corporation N/A $4,439,210 $4,439,210 Capital Partners, Inc. Exelon Automated Power Exchange Competitive Power 1,500,000 $3,000,000 $3,000,000 Capital Exchange Business Partners, Inc. Exelon UTECH Climate Challenge Fund, L.P. Venture Capital N/A $4,582,713 $23,847,576 Capital Investment Partners, Inc. Exelon Exotrope Convertible Debentures N/A $500,000 $500,000 Capital Partners, Inc. Exelon Media Station, Inc. Preferred plus 214,286 $1,500,000 $1,500,000 Capital Warrants (Common) 48,702 Partners, Inc. Energy WorldWide Web NetworX Corporation Common shares 73,450 $316,753 $9,181 Trading Company Energy Entrade Common Shares 200,000 $1,489,115 $162,500 Trading Company N/A Not applicable 5

ITEM 6. OFFICERS AND DIRECTORS - PART 1. The positions of officers and directors of system companies as of December 31, 2000 were as follows: Exelon Corporation Board of Directors Edward A. Brennan Carlos H. Cantu Daniel L. Cooper M. Walter D'Alessio Bruce DeMars G. Fred DiBona, Jr. Sue Ling Gin Richard H. Glanton Rosemarie B. Greco Edgar D. Jannotta Corbin A. McNeill, Jr. John M. Palms John W. Rogers, Jr. John W. Rowe Ronald Rubin Richard L. Thomas Officers McNeill, Jr., Corbin A. Co-Chief Executive Officer and Chairman Rowe, John W. Co-Chief Executive Officer and President Kingsley Jr., Oliver D. Executive Vice President Egan, Michael J. Executive Vice President Strobel, Pamela B. Executive Vice President McLean, Ian P. Senior Vice President Mehrberg, Randall E. Senior Vice President and General Counsel Moler, Elizabeth A. Senior Vice President, Government Affairs-Federal Padron, Honorio J. Senior Vice President Snodgrass, S. Gary Senior Vice President and Chief Human Resources Officer Lawrence, Kenneth G. Senior Vice President Clark, Frank M. Senior Vice President, Communications and Public Affairs Gillis, Ruth Ann M. Senior Vice President and Chief Financial Officer Woods, David W. Senior Vice President Gibson, Jean Vice President and Corporate Controller Haviland, Paul E. Vice President, Corporate Development McDonald, Robert K. Vice President, Risk Management Mitchell, J. Barry Vice President and Treasurer Combs, Katherine K. Vice President and Corporate Secretary Cesareo, David J. Vice President, Environmental Health and Safety Kirchoffner, Donald P. Vice President, Communications Brown, Virginia A. Vice President, Human Resources Planning and Development DaSilva, Assir R. Vice President, Diversity Diedrich, John F. Vice President, Employee Health and Benefits Fonseca, Victor Vice President, Compensation Samolis, John R. Vice President, Labor and Employee Relations Peters, Scott N. Assistant Secretary Cutler, Todd D. Assistant Secretary Shicora, George Assistant Treasurer Walls, Charles M. Assistant Treasurer 6

COMED Officers McNeill, Jr, Corbin A Co-Chief Executive Officer; Rowe, John W Co-Chief Executive Officer and President; Chairman Kingsley Jr, Oliver D EVP, Nuclear and Chief Nuclear Officer Strobel, Pamela B EVP, Energy Delivery, Clark, Frank M Sr VP, Distribution Cust/Mrktg Services & Ext Affairs Crane, Christopher M Sr VP, Nuclear Regional Operating Group 1 Gillis, Ruth Ann M Sr VP, Finance and Chief Financial Officer Helwig, David R Sr VP, Nuclear Services McLean, Ian P Sr VP, Power Team Padron, Honorio J Sr VP, Business Services Snodgrass, S Gary Sr VP, Human Resources Woods, David W Sr VP, Communications & Public Affairs Skolds, John L Chief Operating Officer, Nuclear Benjamin, Jeffrey A VP, Nuclear Licensing and Regulatory Bohlke, William H VP, Nuclear Engineering Bonney, Paul R VP, Business Services General Counsel Cesareo, David J VP, Environmental Health and Safety Cornew, Kenneth W VP, Power Team Long-term Transactions Costello, John T VP, Distribution Customer Service Operations Cullen, Jr, Edward J VP, Generation General Counsel DeCampli, David G VP, Energy Delivery Engineering & Technical Analysis Donleavy, John J VP, Distribution Regional Distributions, Operations Dwyer, Robert E,. Jr. VP, Distribution Media Relations, Communications, & Reporting, Erdlen, Michael VP, Power Team Information Technology Flavin, Joseph VP, Business Services Supply Freeman, Jan H VP, Generation Public Affairs, Gibson, Jean VP and Corporate Controller Gordon, Jennifer VP, Business Services Communications Guerra, James D VP, Nuclear Business Operations Heffley, J Michael VP, Nuclear Oversight Ho, Alan VP, Business Services Information Technology Hooker, John T VP, Distribution Services, Community Relations & Admin Services Ivey, Susan O VP, Power Team Short-term Transactions Jiruska, Frank J VP, Distribution Energy Services, Marketing & Sales Jennings, Theodore E VP, Nuclear Outage & Project Management Juracek, Arlene A VP, Distribution Rates & Access Implementation, Reg. Strategies, Governmental & Reg. Affairs Krisch, Joseph R VP, Distribution HR Training & Safety Landy, Richard J VP, Nuclear HR & Administration Lasky, Joseph A VP, Distribution Information Technology Lauer, Rebecca J VP, Distribution General Counsel Lizanich, Nicholas J VP, Distribution Planning and Engineering Malone, James P VP, Nuclear Fuels McDermott, Cornelius J VP, Generation Communications Metzner, Michael VP, Power Team Finance/Analytics/Risk Moscovitch, Ruth M VP, Energy Delivery and Distribution Strategic Initiatives 7

Segneri, Jr, Carl L VP, Distribution Regional Distributions, Operations Settelen, John L VP & Generation Controller Spencer, Steven VP, Business Services Finance Stanley, Harold Gene VP, Nuclear MW ROG Support Talbot, Ronald E VP, Distribution Regional Distributions, Operations Terrell, Napoleon VP, Business Services Human Resources Tyne, Ray VP, Business Services Operations Williams, James B VP, Distribution Project & Contract Management Dimmette, Joel P Site VP - Quad Cities Levis, William Site VP - Byron Pardee, Charles G Site VP - LaSalle Swafford, Preston D Site VP - Dresden Tulon, Timothy Site VP - Braidwood Mitchell, J Barry VP and Treasurer Shicora, George R Assistant Treasurer Walls, Charles S Assistant Treasurer Combs, Katherine K Secretary Cutler, Todd D Assistant Secretary Peters, Scott N Assistant Secretary PECO Officers McNeill, Jr, Corbin A Co-Chief Executive Officer and President; Chairman Rowe, John W Co-Chief Executive Officer Kingsley Jr, Oliver D EVP, Nuclear and Chief Nuclear Officer Egan, Michael J EVP, Enterprises Strobel, Pamela B EVP, Energy Delivery Cotton, John B Sr VP, Nuclear Technical Support Crane, Christopher M Sr VP, Nuclear Regional Operating Group 1 Cucchi, Gregory A Sr VP, Enterprises Gillis, Ruth Ann M Sr VP, Finance and Chief Financial Officer Hagan, Joseph J Sr VP, Nuclear Regional Operating Group 2 Jacobs, Christine A Sr VP, Exelon Power Lawrence, Kenneth G Sr VP, Distribution McElwain, John P Sr VP, Nuclear Regional Operating Group 3 McLean, Ian P Sr VP, Power Team Padron, Honorio J Sr VP, Business Services Rainey, Gerald R Sr VP, Generation Rhodes, Gerald N Sr VP, Exelon Energy Smith, III, William H Sr VP, Business Services Snodgrass, S Gary Sr VP, Human Resources Woods, David W Sr VP, Communications & Public Affairs Skolds, John L Chief Operating Officer, Nuclear Adams, Craig L VP, Distribution Contractor & Supply Management 8

Benjamin, Jeffrey A VP, Nuclear Licensing and Regulatory Bohlke, William H VP, Nuclear Engineering Bonney, Paul R VP, Business Services General Counsel Cavanaugh, Ellen M VP, Distribution Electric Supply & Transmission Cesareo, David J VP, Environmental Health and Safety Coyle, Michael T VP, Clinton Power Station Cornew, Kenneth W VP, Power Team Long-term Transactions Cullen, Jr, Edward J VP, Generation General Counsel DeCampli, David G VP, Energy Delivery Engineering & Technical Analysis Doering, Jr., John VP, Peach Bottom Atomic Power Station Dudkin, Gregory N VP, Distribution Customer & Marketing Services Erdlen, Michael VP, Power Team Information Technology Flavin, Joseph VP, Business Services Supply Freeman, Jan H VP, Generation Public Affairs Gibson, Jean VP and Corporate Controller Gordon, Jennifer VP, Business Services Communications Haviland, Paul E VP, Corporate Development Hill, Jr, Thomas P VP, Distribution Finance Ho, Alan VP, Business Services Information Technology Horting, Reed R VP, Distribution Gas Supply & Transportation Ivey, Susan O VP, Power Team Short-term Transactions Jennings, Theodore E VP, Nuclear Outage & Project Management Johnston, J Lindsay VP, Distribution Human Resources Kray, Marilyn C VP, Nuclear Acquisition Support and Integration Officer Langenbach, James W VP, Nuclear Station Support Landy, Richard J VP, Nuclear HR & Administration Lauer, Rebecca J VP, Energy Delivery General Counsel Lewis, Charles P VP, Generation Strategy & Development Malone, James P VP, Nuclear Fuels Matthews, Cassandra A VP, Information Technology and Chief Information Officer McDermott, Cornelius J VP, Generation Communications Metzner, Michael VP, Power Team Fiance/Analytics/Risk Moscovitch, Ruth M VP, Energy Delivery Strategic Initiatives Muntz, James A VP, Generation Special Projects 9

Murphy, Dennis E VP, Enterprises Marketing and Business Development Newman, Glenn VP, Enterprises General Counsel O'Brien, Denis VP, Distribution Operations Settelen, John L VP & Generation Controller Spencer, Steven VP, Business Services Finance Stanley, Harold Gene VP, Nuclear MW ROG Support Terrell, Napoleon VP, Business Services Human Resources Tyne, Ray VP, Business Services Operations Walters, Kathleen M VP, Distribution Information Technology/CIO White, Richard G VP, Corporate Planning Coyle, Michael Site VP - Clinton Nuclear Power Station Doering Jr., John Site VP - Peach Bottom Atomic Power Station Fetters, Drew B Site VP - Vermont Yankee Nuclear Power Station von Suskil, James D Site VP - Limerick Generating Station Warner, Mark E Site VP - TMI Mitchell, J Barry VP and Treasurer Shicora, George R Assistant Treasurer Walls, Charles S Assistant Treasurer Combs, Katherine K Secretary Cutler, Todd D Assistant Secretary Peters, Scott N Assistant Secretary Exelon Generation Officers McNeill, Jr, Corbin A Chief Executive Officer and President Exelon Generation Kingsley, Jr, Oliver D President and Chief Nuclear Officer, Exelon Nuclear McLean, Ian P President, Exelon Power Team Skolds, John L Chief Operating Officer, Exelon Nuclear Bohlke, William H Sr VP, Nuclear Services, Exelon Nuclear Cotton, John B Sr VP, Technical Support, Exelon Nuclear Crane, Christopher M Sr VP, MidWest Regional Operating Group, Exelon Nuclear Hagan, Joseph J Sr VP, MidAtlantic Regional Operating Group, Exelon Nuclear Jacobs, Christine A Sr VP, Exelon Generation; President, Exelon Power McElwain, John P Sr VP, Exelon Nuclear Woods, David W Sr VP, Communications & Public Affairs, Exelon Generation Benjamin, Jeffrey A VP, Licensing and Regulatory, Exelon Nuclear Cornew, Kenneth W VP, Long-term Transactions, Exelon Power Team Cullen, Jr, Edward J VP, General Counsel and Secretary Erdlen, Michael VP, Information Technology, Exelon Power Team Freeman, Jan H VP, Public Affairs, Exelon Generation Guerra, James D VP, Business Operations, Exelon Nuclear Heffley, J Michael1 VP, Nuclear Oversight, Exelon Nuclear Ivey, Susan O VP, Short-term Transactions, Exelon Power Team Jennings, Theodore E VP, Outage & Project Management, Exelon Nuclear Kray, Marilyn C VP, Acquisition Support and Integration, Exelon Nuclear Landy, Richard J VP, Human Resources & Administration, Exelon Nuclear Langenbach, James W VP, Nuclear Station Support, Exelon Nuclear Lewis, Charles P VP, Strategy & Development, Exelon Generation Malone, James P VP, Nuclear Fuels, Exelon Nuclear McDermott, Cornelius J VP, Communications, Exelon Generation Meister, James R VP, Nuclear Engineering, Exelon Nuclear Metzner, Michael VP, Finance/Analytics/Risk, Exelon Power Team 10

Muntz, James A VP, Special Projects, Exelon Generation Settelen, John L VP & Controller, Exelon Generation Stanley, Harold Gene VP, MidWest ROG Support, Exelon Nuclear Heffley, J Michael Site VP - Clinton Nuclear Power Station Dimmette, Joel P Site VP - Quad Cities Nuclear Power Station DeGregorio, Ronald J Site VP - Oyster Creek Doering, Jr, John Site VP - Peach Bottom Atomic Power Station Fetters, Drew B Site VP - Vermont Yankee Nuclear Power Station Levis, William Site VP - Byron Station Pardee, Charles G Site VP - LaSalle County Station Swafford, Preston D Site VP - Dresden Nuclear Power Station Tulon, Timothy Site VP - Braidwood Station von Suskil, James D Site VP - Limerick Generating Station Warner, Mark E Site VP - TMI Berdelle, Robert E VP, Generation McDonald, Robert K VP, Generation Spencer, Steven L VP, Business Services, Financial Services Mitchell, J Barry VP and Treasurer Shicora, George R Assistant Treasurer Walls, Charles S Assistant Treasurer Cutler, Todd D Assistant Secretary Peters, Scott N Assistant Secretary Exelon Enterprises Officers Rowe, John W Chair Egan, Michael J President & Chief Executive Officer Beard, Kenneth H VP, Exelon Enterprises & President, Energy Services Abromitis, James J VP, Exelon Thermal Technologies Cucchi, Gregory A VP Exelon Enterprises & President, Exelon Infrastructure Services & Telecommunications Gilpin, Robert A VP, Residential Energy Hoekstra, Louis A VP, Energy Solutions Kampling, Patricia L SVP & Chief Financial Officer Murphy, Dennis E VP, Marketing & Business Development Newman, Glenn D VP, General Counsel and Secretary Rhodes, Gerald N VP, Exelon Enterprises and President, Exelon Energy Rollo, Richard VP, Strategic Planning Rowe, E Kathleen VP, Information Technology, Business Services & Supply Shinn, Robert A VP, Exelon Capital Partners 11

Berdelle, Robert E VP, Enterprises McDonald, Robert K VP, Enterprises Spencer, Steven L VP, Business Services, Financial Services Mitchell, J Barry VP and Treasurer Shicora, George R Assistant Treasurer Walls, Charles S Assistant Treasurer Cutler, Todd D Assistant Secretary Peters, Scott N Assistant Secretary The listing of Officers for PEPCO will be filed with the Amendment to the 2000 Exelon and PEPCO U5S filing related to Exhibit F.3. ITEM 6. OFFICERS AND DIRECTORS - PART II. Financial Connections - The following is a list, as of December 31, 2000, of all officers and directors of each system company who have financial connections within the provisions of Section 17(c) of the Public Utility Holding Company Act of 1935. 1. Edward A. Brennan: Member of Board of Directors of Unicom and ComEd from 1995 through the merger closing; member of Board of Directors of Exelon since the merger closing, and member of Board of Directors of Morgan Stanley Dean Witter & Co., investment banker. Authorized pursuant to Rule 70(b). 2. Carlos H. Cantu: Member of Board of Directors of Unicom and ComEd from 1998 through the merger closing; member of Board of Directors of Exelon since the merger closing, and member of Board of Directors of First Tennessee National Corporation, commercial banking institution. Authorized pursuant to Rule 70(b). 3. Edgar D. Jannotta: Member of Board of Directors of Unicom and ComEd from 1994 through the merger closing; member of Board of Directors of Exelon since the merger closing, and Senior Director of William Blair & Co., L.L.C., investment banker. Authorized pursuant to Rule 70(b). 4. John W. Rogers: Member of Board of Directors of Unicom and ComEd from 1999 through the merger closing; member of Board of Directors of Exelon since the merger closing, and member of Board of Directors of Bank One Corporation, commercial banking institution. Authorized pursuant to Rule 70(a). 5. John W. Rowe: Member of Board of Directors of Unicom and ComEd from 1998 through the merger closing; member of Board of Directors of Exelon since the merger closing, and member of Board of Directors of Fleet Boston Financial, commercial banking institution. Authorized pursuant to Rule 70(b). 12

ITEM 6. OFFICER AND DIRECTORS - PART III. (a), (b) and (c) Directors' and Executive Officers' Compensation, Interests in Securities Interests and Transactions with System Companies. Information concerning compensation, interests in system securities, and transactions with system companies is set forth in Exhibits A.1 and A.2 to this Form U5S and is incorporated herein by reference. (d) Indebtedness of Directors or Executive Officers to System Companies. None (e) Directors' and Executive Officers' Participation in Bonus and Profit-Sharing Arrangements and Other Benefits. See Exhibit A.2 for descriptions of the participation of directors and executive officers of System companies in bonus and profit-sharing arrangements and other benefits. (f) Directors' and Executive Officers' rights to Indemnity. The state laws under which each of the companies is incorporated provide broadly for indemnification of directors and officers against claims and liabilities against them in their capacities as such. Each of the companies' charters or by-laws also provides for indemnification of directors and officers. In addition, directors and executive offices of Exelon and all subsidiary companies are insured under directors' and officers' liability policies. ITEM 7. CONTRIBUTIONS AND PUBLIC RELATIONS Part I. None Part II. None ITEM 8. SERVICE, SALES AND CONSTRUCTION CONTRACTS Part I. INTERCOMPANY SALES AND SERVICE Exelon provided information on services, sales and construction contracts under Form U-9C-3 filed confidentially on March 30, 2001, pursuant to Rule 104. In addition, Exelon reports the following transactions: Transaction Serving Company Receiving Company Compensation - ----------- --------------- ----------------- ------------ Fiber-optic PECO Hyperion Telecomun- $575,230 Equipment Lease ications Communication AT&T Wireless of PECO $111,726 Services Philadelphia, LLC Other transactions may not have been reported, consistent with the terms of the Merger U-1 order granting Exelon until December 31, 2001 to fully implement its affiliate transaction procedures. 13

Part II. The System companies had no contracts to purchase services or goods during 2000 from any affiliated (other than a System company) or from a company, in which any officer or director of the receiving company is a partner or owns 5 percent of more of any class of equity securities, except as reported in Item 6. Part III. The System company does not employ any other person for the performance on a continuing basis of management, supervisory or financial advisory services. ITEM 9. WHOLESALE GENERATORS AND FOREIGN UTILITY COMPANIES Part I a.) Sithe Energies, Inc. 335 Madison Avenue, 28th Fl. New York, New York 10017 Sithe Energies, Inc. (Sithe) is an independent power generator in North America utilizing primarily fossil and hydro generation. The purchase involves approximately 10,000 megawatts (MW) of generation consisting of 3,800 MW of existing merchant generation, 2,500 MW under construction, and another 3,700 MW of generation in various stages of development, as well as Sithe's domestic marketing and development businesses. The generation assets are located primarily in Massachusetts and New York, but also include plants in Pennsylvania, California, Colorado and Idaho, as well as Canada and Mexico. Exelon owns 49.9% of Sithe and holds the option to purchase the remaining 50.1% interest in Sithe between December 2002 and December 2005 at a price based on prevailing market conditions. AmerGen Energy Company, L.L.C. 200 Exelon Way, Suite 345 Kennett Square, Pennsylvania 19348 Exelon and British Energy, Inc., a wholly owned subsidiary of British Energy plc, formed AmerGen Energy Company, L.L.C. (AmerGen) to pursue opportunities to acquire and operate nuclear generating stations in the United States. Exelon owns a 50% equity interest in AmerGen. AmerGen owns and operates Clinton Nuclear Power Station, Three Mile Island Unit No. 1 Nuclear Generating Facility, and Oyster Creek Nuclear Generation Facility with an aggregate capacity of 2,378 MW. b.) At December 31, 2000, Exelon's aggregate capital investment in all EWGs and FUCOs was approximately $748.0 million of which $704.0 was invested in Sithe and $44.0 million was invested in AmerGen. Exelon Generation and British Energy have each agreed to provide up to $100 million to AmerGen at any time for operating expenses. Exelon anticipates that Exelon Generation's capital expenditures will be funded by internally generated funds, Exelon Generation borrowings or capital contributions from Exelon. Exelon Generation's borrowings may be initially guaranteed by Exelon as a result of Exelon Generation's lack of separate operational history. c.) Exelon accounts for its investments in Sithe and AmerGen using the equity method of accounting whereby Sithe and AmerGen financial statements are not consolidated with the financial statements of Exelon. At December 31, 2000, the consolidated capitalization ratio of Exelon was: debt 66%, common equity 31%, and preferred securities of subsidiaries of 3%. (For these purposes, "consolidated debt" means all long-term debt, long-term debt due within one year, notes payable and other short-term obligations, including any short-term debt and non-recourse debt of EWG/FUCO Projects, to the extent normally consolidated under applicable financial reporting rules). d.) As permitted by the Merger U-1, AmerGen receives services from ComEd and PECO including engineering, regulatory support, systems integration, accounting and general services. These services are performed at cost, pursuant to the Affiliate Interests Agreement in the case of ComEd and pursuant to the Mutual Services Agreement in the case of PECO, and it is expected that each company wil provide AmerGen with approximately $300,000 in services annually. In addition, Exelon Generation Company LLC will provide AmerGen with similar services valued at approximately $49,900,000, at cost, pursuant to a contract being drafted. 14

Part II An organization chart showing the relationship of each EWG to other system companies is included as Exhibit H. (filed herewith on Form SE) Part III As determined pursuant to the December 8, 2000 Order, the Modified Rule 53 Test applicable to Exelon's investments in EWGs and FUCOs issued in connection with the Financing U-1, is $4,000.0 million. At December 31, 2000, Exelon's "aggregate investment" (as defined in rule 53(a) under PUHCA) in all EWGs and FUCOs was approximately $748.0 million, and accordingly, at December 31, 2000, Exelon's remaining investment capacity under the Modified Rule 53 Test was approximately $3,252.0 million. ITEM 10. FINANCIAL STATEMENTS AND EXHIBITS FINANCIAL STATEMENTS Filed confidentially on Form SE. NOTES TO FINANCIAL STATEMENTS Exelon Reference is made to "Notes to Consolidated Financial Statements" contained in the Exelon 2000 Annual Report to Shareholders, which information is incorporated by reference. PEPCO financial statements will be filed with the Amendment to the 2000 Exelon and PEPCO U5S filing related to Exhibit F.3. EXHIBITS The following exhibits are incorporated by reference to the indicated SEC file number, unless a single asterisk appears next to the exhibit reference. A single asterisk indicates exhibits which are filed herewith. EXHIBIT NUMBER DESCRIPTION A. ANNUAL REPORTS FILED UNDER THE SECURITIES AND EXCHANGE ACT OF 1934 A.1 2000 Annual Report on Form 10-K for Exelon, ComEd and PECO, File Nos. 01-16169, 01-1839 and 01-01401, respectively. A.2 2000 Proxy Statement of Exelon Corporation. File No. 01-16169 A.3 Exelon Corporation Form 8-K filed March 16, 2001 containing Exelon 2000 financial statements, footnotes and management's discussion and analysis. B. CHARTERS, ARTICLES OF INCORPORATION, TRUST AGREEMENTS, BY-LAWS, AND OTHER FUNDAMENTAL DOCUMENTS OF ORGANIZATION The articles and bylaws of Exelon, ComEd and PECO are incorporated by reference to the following: Exelon 10-K Exhibit No. Description 3-1 Articles of Incorporation of Exelon Corporation (Registration Statement No. 333-37082, Form S-4, Exhibit 3-1). 3-2 Bylaws of Exelon Corporation (Registration Statement No. 333-37082, Form S-4, Exhibit 3-2). 3-3 Amended and Restated Articles of Incorporation of PECO Energy Company. 3-4 Bylaws of PECO Energy Company, adopted February 26, 1990 and amended January 26, 1998 (File No. 1-01401, 1997 Form 10-K, Exhibit 3-2). 3-5 Restated Articles of Incorporation of Commonwealth Edison Company effective February 20, 1985, including Statements of Resolution Establishing Series, relating to the establishment of three new series of Commonwealth Edison Company preference stock known as the "$9.00 Cumulative Preference Stock," the "$6.875 Cumulative Preference Stock" and the "$2.425 Cumulative Preference Stock" (File No. 1-1839, 1994 Form 10-K, Exhibit 3-2). 3-6 Bylaws of Commonwealth Edison Company, effective September 2, 1998, as amended through October 20, 2000. C. The indentures or other fundamental documents defining the rights of holders of funded debt listed below are incorporated by reference: 15

Exelon 10-K Exhibit No. Description 4-3 First and Refunding Mortgage dated May 1, 1923 between The Counties Gas and Electric Company (predecessor to PECO Energy Company) and Fidelity Trust Company, Trustee (First Union National Bank, successor), (Registration No. 2-2281, Exhibit B-1). 4-3-1 Supplemental Indentures to PECO Energy Company's First and Refunding Mortgage: Dated as of File Reference Exhibit No. ---------------- --------- ----------- May 1, 1927 2-2881 B-1(c) March 1, 1937 2-2881 B-1(g) December 1, 1941 2-4863 B-1(h) November 1, 1944 2-5472 B-1(i) December 1, 1946 2-6821 7-1(j) September 1, 1957 2-13562 2(b)-17 May 1, 1958 2-14020 2(b)-18 March 1, 1968 2-34051 2(b)-24 March 1, 1981 2-72802 4-46 March 1, 1981 2-72802 4-47 December 1, 1984 1-01401, 1984 Form 10-K 4-2(b) April 1, 1991 1-01401, 1991 Form 10-K 4(e)-76 December 1, 1991 1-01401, 1991 Form 10-K 4(e)-77 April 1, 1992 1-01401, March 31, 1992 4(e)-79 Form 10-Q June 1, 1992 1-01401, June 30, 1992 4(e)-81 Form 10-Q July 15, 1992 1-01401, June 30, 1992 4(e)-83 Form 10-Q September 1, 1992 1-01401, 1992 Form 10-K 4(e)-85 March 1, 1993 1-01401, 1992 Form 10-K 4(e)-86 May 1, 1993 1-01401, March 31, 1993 4(e)-88 Form 10-Q May 1, 1993 1-01401, March 31, 1993 4(e)-89 Form 10-Q August 15, 1993 1-01401, Form 8-A dated 4(e)-92 August 19, 1993 November 1, 1993 1-01401, Form 8-A dated 4(e)-95 October 27, 1993 May 1, 1995 1-01401, Form 8-K dated 4(e)-96 May 24, 1995 4-4 Mortgage of Commonwealth Edison Company to Illinois Merchants Trust Company, Trustee (Harris Trust and Savings Bank, as current successor Trustee), dated July 1, 1923, Supplemental Indenture thereto dated August 1, 1944, and amendments and supplements thereto dated, respectively, August 1, 1946, April 1, 1953, March 31, 1967, April 1,1967, July 1, 1968, October 1, 1968, February 28, 1969, May 29, 1970, June 1, 1971, May 31, 1972, June 15, 1973, May 31, 1974, June 13, 1975, May 28, 1976, and June 3, 1977. (File No. 2-60201, Form S-7, Exhibit 2-1). 16

4-5-1 Supplemental Indentures to aforementioned Commonwealth Edison Mortgage. Dated as of File Reference Exhibit No. ---------------- --------- ----------- May 17, 1978 2-99665, Form S-3 4-3 August 31, 1978 2-99665, Form S-3 4-3 June 18, 1979 2-99665, Form S-3 4-3 June 20, 1980 2-99665, Form S-3 4-3 April 16, 1981 2-99665, Form S-3 4-3 April 30, 1982 2-99665, Form S-3 4-3 April 15, 1983 2-99665, Form S-3 4-3 April 13, 1984 2-99665, Form S-3 4-3 April 15, 1985 2-99665, Form S-3 4-3 April 15, 1986 33-6879, Form S-3 4-9 June 15, 1990 33-38232, Form S-3 4-12 June 1, 1991 33-40018, Form S-3 4-12 October 1, 1991 33-40018, Form S-3 4-13 October 15, 1991 33-40018, Form S-3 4-14 February 1, 1992 1-1839, 1991 Form 10-K 4-18 May 15, 1992 33-48542, Form S-3 4-14 July 15, 1992 33-53766, Form S-3 4-13 September 15, 1992 33-53766, Form S-3 4-14 February 1, 1993 1-1839, 1992 Form 10-K 4-14 April 1, 1993 33-64028, Form S-3 4-12 April 15, 1993 33-64028, Form S-3 4-13 June 15, 1993 1-1839, Form 8-K dated 4-1 May 21, 1993 July 1, 1993 1-1839, Form 8-K dated 4-2 May 21, 1993 July 15, 1993 1-1839, Form 10-Q for 4-1 quarter ended June 30, 1993. January 15, 1994 1-1839, 1993 Form 10-K 4-15 December 1, 1994 1-1839, 1994 Form 10-K 4-16 June 1, 1996 1-1839, 1996 Form 10-K 4-16 4-5-2 Instrument of Resignation, Appointment and Acceptance dated January 31, 1996, under the provisions of the Mortgage dated July 1, 1923, and Indentures Supplemental thereto (File No. 1-1839, 1995 Form 10-K, Exhibit 4-28). 4-5-3 Instrument dated as of January 31, 1996, for trustee under the Mortgage dated July 1, 1923 and Indentures Supplemental thereto (File No. 1-1839, 1995 Form 10-K, Exhibit 4-29). 4-6 Indentures of Commonwealth Edison Company to The First National Bank of Chicago, Trustee (Amalgamated Bank of Chicago, as current successor Trustee), dated April 1, 1949, October 1, 1949, October 1, 1950, October 1, 1954, January 1, 1958, January 1, 1959 and December 1, 1961 (File No. 1-1839, 1982 Form 10-K, Exhibit 4-20). 4-7 Indenture dated as of September 1, 1987 between Commonwealth Edison Company and Citibank, N.A., Trustee relating to Notes (File No. 1-1839, Form S-3, Exhibit 4-13). 4-7-1 Supplemental Indenture to Indenture dated September 1, 1987 dated July 14, 1989 (File No. 33-32929, Form S-3, Exhibit 4-16). 4-7-2 Supplemental Indenture to Indenture dated September 1, 1987, dated January 1, 1997 (File No. 1-1839, 1999 Form 10K, Exhibit 4-21). 4-7-3 Supplemental Indenture to Indenture dated September 20, 1987, dated September 1, 2000. 17

D. TAX ALLOCATION AGREEMENT PURSUANT TO RULE 45(c) Not yet available. E. None *F. SCHEDULES SUPPORTING ITEMS OF THE REPORT. F.1 The consent of the independent accountants as to their opinion on Exelon's consolidated financial statements and the footnotes is included in Exhibit F.1. The opinion of the independent accountants as to the financial statements of PEPCO will be filed with the Amendment to the Exelon and PEPCO U5S filing related to Exhibit F.3. F.2 Supporting plant, depreciation and reserve schedules for Commonwealth Edison Company and Commonwealth Edison Company of Indiana, Inc. from FERC Form No. 1 - Annual Report of Major Electric Utilities, Licensees, and Others as follows: (filed herewith on Form SE) Summary of Utility Plant and Accumulated Provisions for Depreciation, Amortization and Depletion Nuclear Fuel Materials Electric Plant in Service Electric Plant Held for Future Use Construction Work in Progress - Electric Accumulated Provision for Depreciation of Electric Utility Plant Non-utility Property F.3 PECO has requested an extension of time to file its FERC Form No. 1 and Annual Report to the Pennsylvania Public Utility Commission. After these forms are filed, an Amendment to Form U5S for Exelon and PEPCO for the year ended December 31, 2000 will be filed with the Commission. G. FINANCIAL DATA SCHEDULES Not available, as financial data schedules are no longer required to be filed. *H. ORGANIZATION CHART (filed herewith on Form SE) I. Exhibit I will be filed with the Amendment to the 2000 Exelon and PEPCO U5S filing related to Exhibit F.3. 18

SIGNATURE Exelon Corporation, a registered holding company, has duly caused this annual report for the year ended December 31, 2000 to be signed on its behalf by the undersigned thereunto duly authorized, pursuant to the requirements of the Public Utility Holding Company Act of 1935. EXELON CORPORATION By: /S/ Jean H. Gibson --------------------- Jean H. Gibson Vice President and Corporate Controller May 1, 2001 19




Exhibit F.1


                       CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the incorporation by reference in this Annual Report to the
Securities and Exchange Commission on Form U5S of Exelon Corporation for the
year ended December 31, 2000 filed pursuant to the Public Utility Holding
Company Act of 1935, of our report dated January 30,2001 relating to the
consolidated financial statements of Exelon Corporation which are incorporated
by reference in their Annual Report on Form 10-K for the year ended December 31,
2000 and our reports dated January 30, 2001 relating to the consolidated
financial statements of Commonwealth Edison Company and PECO Energy Company
which are included in their Annual Reports on Form 10-K for the year ended
December 31, 2000.




PricewaterhouseCoopers
Chicago, Illinois
April 30, 2001