UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                   FORM U-9C-3

                      QUARTERLY REPORT PURSUANT TO RULE 58

                                  June 30, 2003

                               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 5 3 Associate Transactions Part I - Transactions Performed by Reporting Companies on Behalf of Associate Companies 6 Part II - Transactions Performed by Associate Companies On Behalf of Reporting Companies 6 4 Summary of Aggregate Investment 7 5 Other Investments 8 6 Financial Statements and Exhibits 9 Signature 11

ITEM 1. ORGANIZATION CHART - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Energy or Date of % Voting Name of Reporting Company Gas-Related Organization Securities Nature of Business - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Corporation (a) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Commonwealth Edison Company (a) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Commonwealth Research Corporation Energy 6/8/1976 100% Energy-related (Category 1,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ PECO Energy Company (a) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ East Coast Natural Gas Cooperative, LLC Energy 3/15/1995 41.12% Energy-related (Category 9) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Horizon Energy Company * Energy 2/6/1995 100% Energy-related (Category 5) 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) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Penesco Company, LLC Energy 6/6/2001 100% Energy-related (Category 7,9) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Cenesco Company, LLC Energy 12/31/2001 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ExTex Retail Services Company, LLC Energy 5/12/202003 100% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Allowance Management Company, LLC Energy 11/8/2001 100% Energy-related (Category 2) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Power Labs, LLC Energy 11/8/2002 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Power Holdings, LP (a) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Keystone Fuels, LLC Energy 10/17/2000 20.99% Energy-related (Category 9) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Conemaugh Fuels, LLC Energy 10/16/2002 20.72% Energy-related (Category 9) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ExTex Marketing, LLC * Energy 5/13/2002 100% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ExTex Power, LP * Energy 5/13/2002 99% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Enterprises Company, LLC (a) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Energy Company Energy 1/4/1999 100% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ AllEnergy Gas & Electric Marketing Energy 9/12/2000 100% Energy-related (Category 5) Company, LLC - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ AllEnergy Connecticut Company, LLC Energy 6/13/2003 100% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ AllEnergy Massachusetts Company, LLC Energy 6/13/2003 100% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ AllEnergy New York Company, LLC Energy 6/13/2003 100% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ AllEnergy New Jersey Company, LLC Energy 6/13/2003 100% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ AllEnergy Rhode Island Company, LLC Energy 6/13/2003 100% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Texas-Ohio Gas, Inc. Energy 100% Energy-related (Category 5) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Services, Inc. Energy 7/13/1999 100% Energy-related (Category 1, 2,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Services Federal Group, Inc Energy 12/30/1988 100% Energy-related (Category 1,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Unicom Power Holdings, LLC Energy 3/23/1999 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Unicom Power Marketing Inc. Energy 7/28/1997 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 6/30/1995 24.4% Energy-related (Category 2) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Adwin Equipment Company Energy 8/5/1968 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Thermal Holdings, Inc. Energy 8/5/1997 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Chicago LLC Energy 8/5/1999 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Thermal Development, Inc. Energy 2/5/1997 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Thermal Technologies, Inc. Energy 7/30/1993 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT Boston Inc. Energy 12/22/1995 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Boston LLC Energy 1/5/1996 25% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT Houston Inc. Energy 2/5/1997 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT North America Inc. Energy 7/18/1996 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Thermal Technologies Canada Energy 8/1/1996 100% Energy-related (Category 6,7) Inc. - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT Canada, Inc. Energy 8/1/1996 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Windsor Energy 7/18/1996 50% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT National Power Inc. Energy 8/15/1997 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Midway LLC Energy 6/2/1998 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ * Denotes inactive corporation. (a) Directly and / or indirectly holds securities in energy-related companies.

Item 1 ORGANIZATION CHART - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Name of Reporting Company Energy or Date of % Voting Nature of Business Gas-Related Organization Securities - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT Nevada Inc. Energy 10/30/1997 100% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Aladdin LLC Energy 10/28/1997 75% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Las Vegas LLC Energy 10/28/1997 50% Energy-related (Category 6,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ InfraSource Inc. Energy 6/8/1999 95% Energy-related (Category 6,9,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ InfraSource Integrated Services, Inc. Energy 5/28/1999 100% Energy-related (Category 1,4,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ EIS Engineering, Inc* Energy 12/11/2000 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ InfraSource F.S., LLC* Energy 11/23/1998 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ InfraSource E.S., LLC* Energy 2/3/2000 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ InfraSource Corporate Services, Inc. Energy 12/28/2001 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Chowns Communications, Inc. Energy 8/12/1999 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Sunesys, Inc. Energy 4/18/1998 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Sunesys of Virginia, Inc. Energy 8/22/2001 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Fischbach and Moore Electric, Inc. Energy 8/12/1999 100% Energy-related (Category 1,2,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ MRM Technical Group, Inc. Energy 8/12/1999 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Aconite Corporation Energy 5/5/1992 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Gas Distribution Contractors, Inc. Energy 10/31/1988 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Mid-Atlantic Pipeliners, Inc. Energy 1/23/1995 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Mueller Distribution Contractors, Inc. Energy 10/16/1986 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Mueller Pipeliners, Inc. Energy 12/27/1989 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Mechanical Specialties Incorporated Energy 3/29/1995 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Rand-Bright Corporation* Energy 2/11/1985 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ InfraSource Underground Construction, Energy 2/05/2002 100% Energy-related (Category 7) LLC - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ NEWCOSY, Inc Energy 8/12/1999 100% Energy-related (Category 1,2,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ NEWCOTRA, Inc. Energy 8/12/1999 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Fishbach and Moore, Inc. . Energy 4/1/1924 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Fishbach and Moore Electrical Energy 7/22/1946 100% Energy-related (Category 7) Contracting, Inc. - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ T.H. Green Electric Co., Inc. Energy 7/6/1926 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Trinity Industries, Inc. Energy 8/12/1999 100% Energy-related (Category 4,7,9) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ OSP Consultants, Inc. Energy 10/26/1984 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ International Communications Services, Energy 8/15/1989 100% Energy-related (Category 7) Inc. - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ OSP, Inc. Energy 8/12/1987 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ OSP Telecom, Inc. Energy 7/13/1989 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ OSP Telcom de Mexico, S.A. de C.V. * Energy 1/23/1995 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ RJE Telecom, Inc. Energy 1/30/1989 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ OSP Servicios S.A. de C.V. * Energy 9/30/1996 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Utility Locate & Mapping Services, Inc. Energy 3/27/1991 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Universal Network Development Corp. Energy 1/1/1901 49% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Dashiell Holdings Corp. Energy 5/9/2000 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Dashiell Corporation Energy 11/14/1960 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Dacon Corporation Energy 8/11/1969 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ VSI Group Inc Energy 4/20/2000 100% Energy-related (Category 1,2,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ EGW Meter Services, LLC Energy 12/1/2002 100% Energy-related (Category 1,2,7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ MJ Electric, Inc. Energy 10/07/2000 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Electric Services, Inc. Energy 11/02/1983 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ EIS Investments, LLC Energy 11/14/2000 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ WCB Services, LLC* Energy 1/1/192001 49% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Blair Park Services Inc. Energy 4/23/1983 100% Energy-related (Category 7) - ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ * Denotes inactive corporation (a) Directly and / or indirectly holds securities in energy-related companies.

ITEM 2. ISSUANCES AND RENEWALS OF SECURITIES AND CAPITAL CONTRIBUTIONS (in thousands of dollars) - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Company Type of Principal Person to Collateral Consideration Issuing Security Amount of Issue or Cost of Whom Security Given With Received For Securities Issued Security Renewal Capital was Issued Security Each security - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Revolving $150 Issue LIBOR plus 50 Exelon None $150 Thermal credit basis points Thermal Development, Technologies, Inc. Inc. - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Revolving 150 Issue LIBOR plus 50 Exelon None 150 Thermal credit basis points Thermal Development, Holdings, Inc. Inc. - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Revolving 592 Issue LIBOR plus 50 Exelon None 592 Services, Inc. credit basis points Enterprises Company, LLC - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Energy Revolving 24,000 Issue LIBOR plus 50 Exelon None 24,000 Company credit basis points Enterprises Company, LLC - --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Capital Contributions (in thousands of dollars): - ------------------------------------------- ---------------------------------------- ---------------------------------------- Company Contributing Capital Company Receiving Capital Amount of Capital Contribution - ------------------------------------------- ---------------------------------------- ---------------------------------------- Exelon Enterprises Company, LLC Exelon Energy Company *$45,000 - ------------------------------------------- ---------------------------------------- ---------------------------------------- Exelon Generation Company, LLC Conemaugh Fuels, LLC 1,730 - ------------------------------------------- ---------------------------------------- ---------------------------------------- * Conversion of debt to equity

ITEM 3. ASSOCIATE TRANSACTIONS Part I. Transactions Performed by Reporting Companies on Behalf of Associate Companies - ------------------------------------------------------------------------------------------------------------------- Reporting Company Rendering Associate Company Receiving Services Services Types of Services Rendered Total Amount Billed - ------------------------------------------------------------------------------------------------------------------- (thousands of dollars) - ------------------------------------------------------------------------------------------------------------------- Blair Park Services Inc. PECO Energy Company Telecom $547 - ------------------------------------------------------------------------------------------------------------------- Commonwealth Edison Company Exelon Thermal Technologies, Rent 19 Inc. - ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Business Services Security System 1 Company - ------------------------------------------------------------------------------------------------------------------- Exelon Services Federal Commonwealth Edison Company Construction Project Management 4,747 Group, Inc - ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Commonwealth Edison Company Maintenance and Construction 153 Services - ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Energy Company IT Services/Facility Charges 115 - ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Enterprises Company, IT Services/Facility Charges 26 LLC - ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Business Services Construction Services 159 Group - ------------------------------------------------------------------------------------------------------------------- Electric Services, Inc Exelon Generation Security System 78 Company, LLC - ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Commonwealth Edison Company Security System 92 - ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc PECO Energy Company Security System 11 - ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Development, Northwind Aladdin LLC Plant Operators 82 Inc. - ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Development, Northwind Windsor Joint Administrative and General 2 Inc. Venture - ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Aladdin LLC Administrative and General 1 Inc. - ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Aladdin LLC Plant Management 27 Inc. - ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Chicago LLC District Cooling 255 Inc. - ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Chicago LLC Plant Operators 131 Inc. - ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Chicago LLC Rent 27 Inc. - ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Midway LLC Plant Operators 160 Inc. - ------------------------------------------------------------------------------------------------------------------- InfraSource Integrated PECO Energy Company Construction and Maintenance 7,430 Services, Inc - ------------------------------------------------------------------------------------------------------------------- Electric Services, Inc. PECO Energy Company Construction and Maintenance 99 - ------------------------------------------------------------------------------------------------------------------- Electric Services, Inc. Exelon Generation Maintenance 24 Company, LLC - ------------------------------------------------------------------------------------------------------------------- Mid-Atlantic Pipeliners, Inc. PECO Energy Company Construction 79 - ------------------------------------------------------------------------------------------------------------------- MJ Electric, Inc. Exelon Generation Maintenance 7 Company, LLC - ------------------------------------------------------------------------------------------------------------------- MJ Electric, Inc. Commonwealth Edison Company Construction and Maintenance 6,397 - ------------------------------------------------------------------------------------------------------------------- MJ Electric, Inc. Exelon Generation Construction and Maintenance 2,072 Company, LLC - ------------------------------------------------------------------------------------------------------------------- MJ Electric, Inc. PECO Energy Company Construction and Maintenance 544 - ------------------------------------------------------------------------------------------------------------------- Northwind Chicago, LLC Exelon Thermal Technologies, Cooling 1,230 Inc. - ------------------------------------------------------------------------------------------------------------------- VSI Group, Inc. PECO Energy Company Transfer Work and Meter Reading 864 (AMR Project) - ------------------------------------------------------------------------------------------------------------------- ITEM 3. ASSOCIATE TRANSACTIONS Part II. Transactions Performed by Associate Companies on Behalf of Reporting Companies - ------------------------------------------------------------------------------------------------------------------------ Associate Company Rendering Reporting Company Receiving Services Types of Services Rendered Total Amount Billed Services - ------------------------------------------------------------------------------------------------------------------------ (thousands of dollars) - ------------------------------------------------------------------------------------------------------------------------ Exelon Services, Inc. Exelon Energy Company IT Services/Facility $115 Charges - ------------------------------------------------------------------------------------------------------------------------ Commonwealth Edison Company Exelon Services Federal Group, Inc. Contract Services 35 - ------------------------------------------------------------------------------------------------------------------------ Exelon Business Services Company InfraSource Corporate Services Legal 183 - ------------------------------------------------------------------------------------------------------------------------ PECO Energy Company Exelon Services Federal Group, Inc. Contract Services 22 - ------------------------------------------------------------------------------------------------------------------------ Exelon Enterprises Company, LLC InfraSource Corporate Services Payroll - Executive 115 - ------------------------------------------------------------------------------------------------------------------------ Exelon Business Services Company InfraSource Corporate Services Rent, Teleconferencing, 48 Phones, Computers, IT and Accounting - ------------------------------------------------------------------------------------------------------------------------ PECO Energy Company InfraSource Integrated Services Vehicle Expenses and 1,203 Materials - ------------------------------------------------------------------------------------------------------------------------

ITEM 4. SUMMARY OF AGGREGATE INVESTMENT June 30, 2003 (in thousands) Investments in energy-related companies: Total consolidated capitalization of Exelon Corporation as of June 30, 2003 $24,845,000 Line 1 Total capitalization multiplied by 15% (line 1 multiplied by 0.15) $3,726,750 Line 2 Greater of $50 million or line 2 3,726,750 Line 3 Total current aggregate investment subsequent to October 20, 2000 (categorized by major line of energy-related business): Energy-related business category 2 164,599 Energy-related business category 5 385,246 Energy-related business category 6 55,620 Energy-related business category 7 573,346 Energy-related business category 9 8,241 Energy-related business category 10 16 Total current aggregate investment 1,187,068 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) $2,539,682 Line 5 ============ Investments in gas-related companies: NONE

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

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, 2003 - filed under confidential treatment pursuant to Rule 104(b). (2) Exhibit A-2 Balance Sheet of Exelon Services, Inc. at June 30, 2003 - 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, 2003 - filed under confidential treatment pursuant to Rule 104(b). (4) Exhibit A-4 Balance Sheet of Exelon Thermal Holdings, Inc. at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (5) Exhibit A-5 Statement of Income of Exelon Energy Company for three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (6) Exhibit A-6 Balance Sheet of Exelon Energy Company at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (7) Exhibit A-7 Statement of Income of Unicom Power Holdings, Inc. for three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (8) Exhibit A-8 Balance Sheet of Unicom Power Holdings, Inc. at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (9) Exhibit A-9 Statement of Income of Energy Trading Company for three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (10) Exhibit A-10 Balance Sheet of Energy Trading Company at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b) (11) Exhibit A-11 Statement of Income of Unicom Power Marketing, Inc. for three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (12) Exhibit A-12 Balance Sheet of Unicom Power Marketing, Inc. at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (13) Exhibit A-13 Statement of Income of Adwin Equipment Company for three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (14) Exhibit A-14 Balance Sheet of Adwin Equipment Company at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (15) Exhibit A-15 Statement of Income of InfraSource, Inc. for three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (16) Exhibit A-16 Balance Sheet of InfraSource, Inc. at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (17) Exhibit B-1 Statement of Income of Penesco Company, LLC for three months and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (18) Exhibit B-2 Balance Sheet of Penesco Company, LLC at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b).

(19) Exhibit B-3 Statement of Income of Cenesco Company, LLC for three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (20) Exhibit B-4 Balance Sheet of Cenesco Company, LLC at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (21) Exhibit B-5 Statement of Income of Exelon Allowance Management Co. for three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (22) Exhibit B-6 Balance Sheet of Exelon Allowance Management Co. at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (23) Exhibit B-7 Statement of Income of ExTex Marketing, LLC for three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (24) Exhibit B-8 Balance Sheet of ExTex Marketing, LLC at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (25) Exhibit B-9 Statement of Income of ExTex Power, LP for the three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (26) Exhibit B-10 Balance Sheet of ExTex Power, LP at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (27) Exhibit B-11 Statement of Income of Exelon New England Power Marketing LP for the three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (28) Exhibit B-12 Balance Sheet of Exelon New England Power Marketing LP at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (29) Exhibit B-13 Statement of Income of Exelon New England Power Services, Inc. for the three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (30) Exhibit B-14 Balance Sheet of Exelon New England Power Services, Inc. at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (31) Exhibit B-15 Statement of Income of Exelon Hamilton for the three and six months ended June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (32) Exhibit B-16 Balance Sheet of Exelon Hamilton at June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (33) Exhibit B-17 Trial Balance for Keystone Fuels, LLC through June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b). (34) Exhibit B-18 Trial Balance for Conemaugh Fuels, LLC through June 30, 2003 - filed under confidential treatment pursuant to Rule 104(b).

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 29, 2003 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 2003 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