UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                   FORM U-9C-3

                      QUARTERLY REPORT PURSUANT TO RULE 58

                                December 31, 2002

                               Exelon Corporation

                            10 South Dearborn Street
                                   37th Floor
                             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
                                                       Chicago, IL 60680-5379



TABLE OF CONTENTS Item Page Number Number 1 Organization Chart 2 2 Issuances and Renewals of Securities and Capital Contributions 4 3 Associate Transactions Part I - Transactions Performed by Reporting Companies on Behalf of Associate Companies 4 Part II - Transactions Performed by Associate Companies On Behalf of Reporting Companies 5 4 Summary of Aggregate Investment 6 5 Other Investments 7 6 Exhibits 8 Signatures 9 ITEM 1. ORGANIZATION CHART Energy or Date of % Voting Name of Reporting Company Gas-Related Organization Securities Nature of Business - -------------------------------------------------------------------------------------------------------------------------------- Exelon Corporation (a) Exelon Generation Company, LLC (a) Exelon AOG Holding # 1, Inc. (a) Exelon AOG Holding # 2, Inc. (a) Exelon New England Power Marketing, LP Energy 3/24/1999 100% Energy-related (Category 5) Exelon New England Holdings, LLC (a) Exelon New England Power Services, Inc. Energy 2/5/1998 100% Energy-related (Category 7) Exelon Hamilton, LLC Energy 3/31/1999 100% Energy-related (Category 5) Commonwealth Edison Company (a) Commonwealth Research Corporation Energy 6/8/76 100% Energy-related (Category 1,7) PECO Energy Company (a) Horizon Energy Company * Energy 2/6/95 100% Energy-related (Category 5) Exelon Ventures Company, LLC (a) Exelon Generation Company, LLC 7/27/00 100% Penesco Company, LLC Energy 6/6/01 100% Energy-related (Category 7) Cenesco Company, LLC Energy 12/31/01 100% Energy-related (Category 7) Exelon Allowance Management Company, LLC Energy 11/8/01 100% Energy-related (Category 2) Exelon Peaker Development General, LLC (a) 10/17/00 100% Keystone Fuels, LLC Energy 10/17/00 20.99% Energy-related (Category 9) Conemaugh Fuels, LLC Energy 10/16/02 20.72% Energy-related (Category 9) ExTex Marketing, LLC * Energy 5/13/02 100% Energy-related (Category 10) ExTex Power, LP * Energy 5/13/02 99% Energy-related (Category 10) Exelon Enterprises Company, LLC (a) Exelon Energy Company Energy and 1/4/99 100% Energy-related (Category 5) Gas-Related AllEnergy Gas & Electric Marketing Energy 100% Energy-related (Category 5) Company LLC Texas-Ohio Gas, Inc. Energy 100% Energy-related (Category 5) Exelon Energy Ohio, Inc. (b) Energy 9/16/93 100% Energy-related (Category 5) Exelon Services, Inc. Energy 7/13/99 100% Energy-related (Category 1, 2,7, 8) Exelon Services Federal Group, Inc. Energy 12/30/88 100% Energy-related (Category 1,7,8) (formerly Systems Engineering Management Corp.) Unicom Power Holdings Inc. Energy 3/23/99 100% Energy-related (Category 7,8) Unicom Power Marketing Inc. Energy 7/28/97 100% Energy-related (Category 5) Exelon Enterprises Management, Inc. (a) Exelon Capital Partners, Inc. (a) Exelon Enterprises Investments, Inc.(a) UTECH Climate Challenge Fund, L.P. Energy 6/30/95 24.3% Energy-related (Category 2) EEI Telecommunications Holdings, LLC (a) * Denotes inactive corporation (a) Directly and / or indirectly holds securities in energy-related companies. (Item 1 continued on next page.) 2

ITEM 1. ORGANIZATION CHART (continued) Energy or Date of % Voting Name of Reporting Company Gas-Related Organization Securities Nature of Business - -------------------------------------------------------------------------------------------------------------------------------- Automated Power Exchange Energy <5% Energy-related (Category 3) ECP Telecommunications Holdings, LLC (a) Energy Trading Company Energy 12/3/96 100% Energy-related (Category 7) Adwin Equipment Company Energy 8/5/68 100% Energy-related (Category 6,7) Exelon Thermal Holdings, Inc. (formerly UT Energy 8/5/97 100% Energy-related (Category 6,7) Holdings Inc) Northwind Chicago LLC Energy 8/5/99 100% Energy-related (Category 6,7) Exelon Thermal Development Inc. (formerly Energy 2/5/97 100% Energy-related (Category 6,7) Unicom Thermal Development Inc.) Exelon Thermal Technologies Inc. Energy 7/30/93 100% Energy-related (Category 6,7) ETT Boston Inc. (formerly Exelon Thermal Energy 12/22/95 100% Energy-related (Category 6,7) Technologies Boston Inc.) Northwind Boston LLC Energy 1/5/96 25% Energy-related (Category 6,7) ETT Houston Inc. (formerly Exelon Thermal Energy 2/5/97 100% Energy-related (Category 6,7) Technologies Houston Inc.) Northwind Houston LLC Energy 2/19/97 25% Energy-related (Category 6,7) Northwind Houston LP Energy 2/20/97 25% Energy-related (Category 6,7) ETT North America Inc. (formerly Exelon Energy 7/18/96 100% Energy-related (Category 6,7) Thermal Technologies North America Inc.) Northwind Thermal Technologies Canada Energy 8/1/96 100% Energy-related; Application Inc. Pending ETT Canada, Inc. (formerly Unicom Energy 8/1/96 100% Energy-related; Application Thermal Pending Technologies Inc. (New Brunswick)) ETT National Power Inc. (formerly UTT Energy 8/15/97 100% Energy-related (Category 6,7) National Power Inc.) Northwind Midway LLC Energy 6/2/98 100% Energy-related (Category 6,7) ETT Nevada Inc. (formerly UTT Nevada Inc.) Energy 10/30/97 100% Energy-related (Category 6,7) Northwind Aladdin LLC Energy 10/28/97 75% Energy-related (Category 6,7) Northwind Las Vegas LLC Energy 10/28/97 50% Energy-related (Category 6,7) ETT Arizona, Inc. (formerly UTT Phoenix Energy 12/10/99 100% Energy-related (Category 6,7) Inc.) Northwind Arizona Development LLC Energy 12/10/97 50% Energy-related (Category 6,7) Northwind Phoenix LLC Energy 12/10/97 50% Energy-related (Category 6,7) InfraSource Inc. Energy 6/8/99 < 100% Energy-related (Category 6,9) Infrasource Integrated Services, Inc. Energy 5/28/99 100% Energy-related (Category 1,4,7,9) (formerly Exelon Infrastructure Services of Pennsylvania, Inc) EIS Engineering Energy 12/11/00 100% Energy-related (Category 7) P.A.C.E. Field Services, LLC Energy 11/23/98 100% Energy-related (Category 7) P.A.C.E. Environmental, LLC Energy 2/3/00 100% Energy-related (Category 7) InfraSource Corporate Services, Inc. Energy 12/28/01 100% Energy-related (Category 7) Chowns Communications, Inc. Energy 8/12/99 100% Energy-related (Category 7) Fischbach and Moore Electric, Inc. Energy 8/12/99 100% Energy-related (Category 1,2,7) MRM Technical Group, Inc. Energy 8/12/99 100% Energy-related (Category 7) Aconite Corporation Energy 5/5/92 100% Energy-related (Category 7) Gas Distribution Contractors, Inc. Energy 10/31/88 100% Energy-related (Category 7) Mid-Atlantic Pipeliners, Inc. Energy 1/23/95 100% Energy-related (Category 7) Mueller Distribution Contractors, Inc. Energy 10/16/86 100% Energy-related (Category 7) Mueller Energy Services, Inc. Energy 9/26/94 100% Energy-related (Category 7) Mueller Pipeliners, Inc. Energy 12/27/89 100% Energy-related (Category 7) Mechanical Specialties Incorporated Energy 3/29/95 100% Energy-related (Category 7) Rand-Bright Corporation Energy 2/11/85 100% Energy-related (Category 7) Syracuse Merit Electric, Inc. Energy 8/12/99 100% Energy-related (Category 1,2,7) Trinity Industries, Inc. Energy 8/12/99 100% Energy-related (Category 4,7,9) OSP Consultants, Inc. Energy 10/26/84 100% Energy-related (Category 7) International Communications Services, Energy 8/15/89 100% Energy-related (Category 7) Inc. OSP, Inc. Energy 8/12/87 100% Energy-related (Category 7) OSP Servicios, S.A. de C.V. * Energy 9/30/96 100% Energy-related (Category 7) OSP Telecom, Inc. Energy 7/13/89 100% Energy-related (Category 7) OSP Telcom de Mexico, S.A. de C.V. * Energy 1/23/95 100% Energy-related (Category 7) OSP Telcom de Colombia, LTDA * Energy 100% Energy-related (Category 7) OSP Telecommunications, Ltd. Energy 8/8/96 100% Energy-related (Category 7) RJE Telecom, Inc. Energy 1/30/89 100% Energy-related (Category 7) Utility Locate & Mapping Services, Inc. Energy 3/27/91 100% Energy-related (Category 7) Universal Network Services, Inc. Energy 49% Energy-related (Category 7) Dashiell Holdings Corp. Energy 5/9/00 100% Energy-related (Category 7) * Denotes inactive corporation (a) Directly and / or indirectly holds securities in energy-related companies. (Item 1 continued on next page.) 3

ITEM 1. ORGANIZATION CHART (concluded) Energy or Date of % Voting Name of Reporting Company Gas-Related Organization Securities Nature of Business - -------------------------------------------------------------------------------------------------------------------------------- Dashiell Corporation Energy 11/14/60 100% Energy-related (Category 7) Dacon Corporation Energy 8/11/69 100% Energy-related (Category 7) VSI Group Inc Energy 4/20/00 100% Energy-related (Category 1,2,7) International Vital Solutions Group, Inc. Energy 7/28/98 100% Energy-related (Category 1,2,7) Michigan Trenching Service, Inc. Energy 7/21/71 100% Energy-related (Category 7) Lyons Equipment, Inc. Energy 12/5/55 100% Energy-related (Category 7) MJ Electric, Inc. Energy 10/07/00 100% Energy-related (Category 7) Electric Services, Inc. Energy 11/02/83 100% Energy-related (Category 7) EIS Investments, LLC Energy 11/14/00 100% Energy-related (Category 7) WCB Services, LLC Energy 49% Energy-related (Category 7) Blair Park Services Inc. Energy Energy-related (Category 7) * Denotes inactive corporation (a) Directly and / or indirectly holds securities in energy-related companies. (b) Exelon Energy Ohio merged into Exelon Energy Company as of 12/31/02. ITEM 2. ISSUANCES AND RENEWALS OF SECURITIES AND CAPITAL CONTRIBUTIONS Net Change in Borrowings/ Energy-Related Company Receiving / Type of Contributions (in Company Issuing Funds (Repaying) Funds Transaction thousands of dollars) - -------------------------------------------------------------------------------------------------------------------------------- Exelon Energy Company AllEnergy Gas & Electric Marketing Debt Advance 3,500 Company LLC EEI Telecommunications Exelon Services, Inc. Debt Repayment (8,977) Holdings, LLC Exelon Thermal Holdings ETT Boston Debt Advance 1,660 Exelon Enterprises Company, LLC Exelon Energy Company Debt Advance 16,500 EEI Telecommunications Infrasource, Inc Debt Repayment (12,000) Holdings, LLC Exelon Generation, LLC Ex Tex Marketing Capital 1 Contribution Exelon Generation Finance Exelon Allowance Management Company Debt Repayment (7,230) Company Exelon Generation, LLC Cenesco Company, LLC Capital 1 Contribution Exelon Generation, LLC Penesco Company, LLC Capital 15 Contribution Exelon Thermal Holdings Northwind Midway Debt Advance 135 Exelon Thermal Holdings Exelon Thermal Technologies Debt Advance 1,100 Exelon Thermal Holdings ETT Nevada Debt Advance 1 Exelon Thermal Holdings Exelon Thermal Development, Inc Debt Advance 300 EEI Telecommunications Exelon Thermal Holdings Debt Repayment (13,000) Holdings, LLC Exelon Thermal Holdings Exelon Thermal Technologies - Canada Debt Repayment (2,700) ETT Boston Northwind Boston Equity 1,660 Contribution ITEM 3. ASSOCIATE TRANSACTIONS Part I. Transactions Performed by Reporting Companies on Behalf of Associate Companies Reporting Company Rendering Associate Company Receiving Total Amount Billed Services Services Types of Services Rendered (a) (thousands of dollars) - -------------------------------------------------------------------------------------------------------------------------------- Blair Park Services Inc. PECO Hyperion Infrastructure Services 318 (b) Telecommunications Blair Park Services Inc. PECO Energy Company Telecom 2,267 (b) Exelon Services, Inc. Exelon Business Services Group Security System 45 (b) Exelon Services Federal Commonwealth Edison Company Construction Project Management 2,653 (b) Group, Inc Exelon Services, Inc. Commonwealth Edison Company Maintenance and Construction 103 (b) Services (a) All amounts listed are direct costs billed unless stated otherwise. (b) Transaction charged at prevailing, or market, price. (Item 3 Part I continued on next page.) 4

ITEM 3 Part I. ASSOCIATE TRANSACTIONS Transactions Performed by Reporting Companies on Behalf of Associate Companies (concluded) Reporting Company Rendering Associate Company Receiving Total Amount Billed Services Services Types of Services Rendered (a) (thousands of dollars) - -------------------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Business Services Group Construction Services 1,212 (b) Exelon Services, Inc Exelon Generation Company, LLC Security System 7 (b) Exelon Services, Inc. Commonwealth Edison Company Security System 510 (b) Exelon Services Federal PECO Energy Company Construction Project Management 661 (b) Group, Inc Exelon Thermal Development Northwind Aladdin LLC Administrative and General 1 Inc. Exelon Thermal Development Northwind Aladdin LLC Plant Operators 92 Inc. Exelon Thermal Development Northwind Windsor Joint Administrative and General 4 Inc. Venture Exelon Thermal Technologies, Northwind Aladdin LLC Administrative and General 6 Inc. Exelon Thermal Technologies, Northwind Aladdin LLC Plant Management 31 Inc. Exelon Thermal Technologies, Northwind Chicago LLC District Cooling 255 (b) Inc. Exelon Thermal Technologies, Northwind Chicago LLC Administrative and General 1 Inc. Exelon Thermal Technologies, Northwind Chicago LLC Plant Operators 131 Inc. Exelon Thermal Technologies, Northwind Chicago LLC Rent 27 (b) Inc. Exelon Thermal Technologies, Northwind Midway LLC Administrative and General 1 Inc. Exelon Thermal Technologies, Northwind Midway LLC Plant Operators 168 Inc. Infrasource Integrated Exelon Generation Company, LLC Maintenance 13 (b) Services, Inc Infrasource Integrated PECO Energy Company Construction and Maintenance 6,980 (b) Services, Inc Electric Services, Inc PECO Energy Company Construction and Maintenance 409 (b) Mid-Atlantic Pipeliners, Inc. PECO Energy Company GAS-ELEC Construction 468 (b) MJ Electric, Inc. Commonwealth Edison Company Construction and Maintenance 5,726 (b) MJ Electric, Inc. Exelon Services, Inc. Construction and Maintenance 19 (b) MJ Electric, Inc. PECO Energy Company Construction and Maintenance 1,043 (b) Northwind Chicago, LLC Exelon Thermal Technologies, Cooling 1,583 (b) Inc VSI Group Inc PECO Energy Company Transfer Work and Meter Reading 3,287 (b) (AMR Project) (a) All amounts listed are direct costs billed unless stated otherwise. (b) Transaction charged at prevailing, or market, price. ITEM 3. ASSOCIATE TRANSACTIONS Part II. Transactions Performed by Associate Companies on Behalf of Reporting Companies Associate Company Rendering Services Reporting Company Receiving Services Types of Services Rendered Total Amount Billed (thousands of dollars) - -------------------------------------------------------------------------------------------------------------------------------- Exelon Business Services Company Exelon Energy Company Administrative and 100 General, Legal Exelon Services, Inc. Exelon Energy Company IT Support 18 MJ Electric, Inc. Exelon Services, Inc. Electrical Contracting 19 ComEd Innovative Energy Exelon Services Federal Group, Inc. Contract Services 750 Solutions Commonwealth Edison Exelon Services Federal Group, Inc. Electrical Contracting 4 Exelon Business Services Company InfraSource Corporate Services Legal 72 PECO Energy Company InfraSource Corporate Services Office Rent 7 Exelon Business Services Company InfraSource Corporate Services Office Rent 136 Exelon Enterprises Company, LLC InfraSource Corporate Services Payroll - Executive 112 Exelon Business Services Company InfraSource Integrated Services Teleconferencing, Phones, 79 Computers, IT and Accounting PECO Energy Company InfraSource Integrated Services Vehicle Expenses and 1,898 Materials (a) Transaction charged at prevailing or market price. 5

ITEM 4. SUMMARY OF AGGREGATE INVESTMENT December 31, 2002 (in thousands) Investments in energy-related companies: Total consolidated capitalization of Exelon Corporation as of December 31, 2002. $24,081,000 Line 1 Total capitalization multiplied by 15% (line 1 multiplied by 0.15) $3,612,150 Line 2 Greater of $50 million or line 2 3,612,150 Line 3 Total current aggregate investment subsequent to October 20, 2000 (categorized by major line of energy-related business): Energy-related business category 2 72,562 Energy-related business category 5 233,226 Energy-related business category 6 10,903 Energy-related business category 7 34,959 Energy-related business category 9 5,847 Energy-related business category 10 1 Total current aggregate investment 357,498 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) $3,254,652 ========== Line 5 Investments in gas-related companies: NONE 6

ITEM 5. OTHER INVESTMENTS Filed under confidential treatment pursuant to Rule 104(b). 7

ITEM 6 - EXHIBITS (1) Purchase Order #00051220 dated October 24, 2002 for time and material from Exelon Services, Inc. (dba Midwest Mechanical) for Business Services Company. Project Q1R17 Bus Duct Cooling Upgrade Installation. (2) Purchase Order #00050879 dated October 11, 2002 for 1 Repair Kit for ISO Phase Bus Duct Cooling System from Exelon Services, Inc. (dba Midwest Mechanical) for Exelon Generation Company, LLC. 8

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 on the 27th day of March 2003. Exelon Corporation Registrant By /s/ Matthew F. Hilzinger ----------------------------- 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 fourth quarter of 2002 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 9