UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM U-9C-3 QUARTERLY REPORT PURSUANT TO RULE 58 March 31, 2004 Exelon Corporation 10 South Dearborn Street 37th Floor P.O. Box 805379 Chicago, IL 60680-5379 Inquiries concerning this Form U-9C-3 should be directed to: Scott Peters Exelon Corporation 10 South Dearborn Street 38th Floor P.O. Box 805379 Chicago, IL 60680-5379 TABLE OF CONTENTS Item Page Number Number 1 Organization Chart 3 2 Issuances and Renewals of Securities and Capital Contributions 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 1 2 ITEM 1. ORGANIZATION CHART ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Energy or Date of % Voting Name of Reporting Company Gas-Related Organization Securities Nature of Business ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Corporation (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Energy Delivery Company, LLC (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Commonwealth Edison Company (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Commonwealth Research Corporation * Energy 06/08/1976 100% Energy-related (Category 1,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ PECO Energy Company (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ East Coast Natural Gas Cooperative, LLC Energy 03/15/1995 41.12% Energy-related (Category 9) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Horizon Energy Company * Energy 02/06/1995 100% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Ventures Company, LLC (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 03/24/1999 100% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon New England Holdings, LLC (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon New England Power Services, Inc. Energy 02/05/1998 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Boston Services, LLC Energy 09/19/2000 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Hamilton, LLC Energy 03/31/1999 100% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Penesco Company, LLC Energy 06/06/2001 100% Energy-related (Category 7,9) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Cenesco Company, LLC Energy 12/31/2001 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ExTex Retail Services Company, LLC Energy 05/12/2003 100% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Allowance Management Company, LLC Energy 11/08/2001 100% Energy-related (Category 2) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Power Labs, LLC Energy 11/08/2002 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon SHC, Inc. (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 05/13/2002 100% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ExTex Power, LP Energy 05/13/2002 99% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Energy Company Energy 01/04/1999 100% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ AllEnergy Gas & Electric Marketing Company, LLC Energy 09/12/2000 100% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Texas-Ohio Gas, Inc. Energy 08/12/1987 100% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Enterprises Company, LLC (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Services, Inc. Energy 07/13/1999 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 03/23/1999 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Unicom Power Marketing Inc. Energy 07/28/1997 100% Energy-related (Category 5) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Enterprises Management, Inc. (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ECPH, LLC (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Capital Partners, Inc. (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Enterprises Investments, Inc. (a) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ UTECH Climate Challenge Fund, L.P. Energy 06/30/1995 24.4% Energy-related (Category 2) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Adwin Equipment Company Energy 08/05/1968 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Thermal Holdings, Inc. Energy 08/05/1997 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Thermal Chicago Corporation Energy 10/03/2003 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Chicago LLC Energy 08/05/1999 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Thermal Technologies, Inc. Energy 07/30/1993 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT National Power Inc. Energy 08/15/1997 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Midway LLC Energy 06/02/1998 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Exelon Thermal Development, Inc. Energy 02/05/1997 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT Boston Inc. Energy 12/22/1995 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Boston LLC Energy 01/05/1996 25% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT Houston Inc. Energy 02/05/1997 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT North America Inc. Energy 07/18/1996 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Thermal Technologies Canada Energy 08/01/1996 100% Energy-related (Category 6,7) Inc. ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ ETT Canada, Inc. Energy 08/01/1996 100% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Northwind Windsor Energy 07/18/1996 50% Energy-related (Category 6,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ * Denotes inactive corporation. (a) Directly and / or indirectly holds securities in energy-related companies. 3 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) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ F&M Holdings Company, LLC Energy 09/18/2003 100% Energy-related (Category 1,4,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ EIS Engineering, Inc* Energy 12/11/2000 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ InfraSource Field Services, LLC* Energy 11/23/1998 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Fischbach and Moore Electric, Inc. Energy 08/12/1999 100% Energy-related (Category 1,2,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Rand-Bright Corporation* Energy 02/11/1985 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ II Services, Inc. Energy 05/28/1999 100% Energy-related (Category 1,2,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ NEWCOSY, Inc Energy 08/12/1999 100% Energy-related (Category 1,2,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ NEWCOTRA, Inc. Energy 08/12/1999 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Fishbach and Moore, Inc. . Energy 04/01/1924 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Fishbach and Moore Electrical Energy 07/22/1946 100% Energy-related (Category 7) Contracting, Inc. ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ T.H. Green Electric Co., Inc. Energy 07/06/1926 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ OSP Servicios S.A. de C.V. * Energy 09/30/1996 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Universal Network Development Corp. Energy 01/01/1901 49% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ Oldco VSI Inc. Energy 04/20/2000 100% Energy-related (Category 1,2,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ EGW Meter Services, LLC Energy 12/01/2002 100% Energy-related (Category 1,2,7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ EIS Investments, LLC Energy 11/14/2000 100% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ WCB Services, LLC* Energy 1/1/192001 49% Energy-related (Category 7) ------------------------------------------------------- ------------- ------------- ----------- ------------------------------ * Denotes inactive corporation (a) Directly and / or indirectly holds securities in energy-related companies. Notes: 1. The following companies were sold during the first quarter of 2004: None. 2. The following name changes occurred during the first quarter of 2004: None. 3. The following are newly created companies: ECPH, LLC an intermediate holding company, formation in Delaware on 1/21/2004. 4. The following company was dissolved during the first quarter of 2004. Northwind Las Vegas, LLC 5. The following restructuring occurred in the first quarter of 2004: Effective January 1, 2004, Exelon contributed its interest in Exelon Energy Company to Generation. The transaction had no impact on the assets and liabilities of Exelon Energy Company, which were previously reported as a part of the Enterprises segment. Beginning in 2004, Exelon Energy Company's assets and liabilities and results of operations are included in Generation's financial statements. The following summary represents the assets and liabilities of Exelon Energy Company that were transferred to Generation as of January 1, 2004: -------------------------------------------------------------------------------- Current assets (including $5 million of cash) $ 89 Property, plant and equipment 2 Deferred debits and other assets 13 Current liabilities (96) Deferred credits and other liabilities (10) Accumulated other comprehensive loss (2) Member's equity 4 4 ITEM 2. ISSUANCES AND RENEWALS OF SECURITIES AND CAPITAL CONTRIBUTIONS (in thousands of dollars) --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Principal Person to Collateral Consideration Company Type of Amount of Issue or Whom Security Given With Received For Issuing Security Security Renewal Cost of Was Issued Security Each Security Securities Issued Capital --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- II Services, Revolving 320 Issue LIBOR plus 50 Exelon None 320 inc. credit basis points Enterprises Company, LLC --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Revolving 350 Issue LIBOR plus 50 Exelon None 350 Enterprises credit basis points Enterprises Management, Company, LLC Inc. --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- F&M Holdings, Revolving 7,875 Issue LIBOR plus 50 Exelon None 7,875 LLC credit basis points Enterprises Company, LLC --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Energy Revolving 75,000 Issue One month Exelon None 75,000 Company credit LIBOR plus Generation .625 Finance Company, LLC --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Exelon Revolving 500 Issue LIBOR plus Exelon None 500 PowerLabs, LLC credit 50 basis points Enterprises Company, LLC --------------- --------------- ---------------- ---------------- --------------- --------------- ------------ -------------- Capital Contributions (in thousands of dollars): ------------------------------------------- ---------------------------------------- ---------------------------------------- Company Contributing Capital Company Receiving Capital Amount of Capital Contribution ------------------------------------------- ---------------------------------------- ---------------------------------------- None. ------------------------------------------- ---------------------------------------- ---------------------------------------- 5 ITEM 3. ASSOCIATE TRANSACTIONS Part I. Transactions Performed by Reporting Companies on Behalf of Associate Companies ------------------------------------------------------------------------------------------------------------------- Reporting Company Rendering Associate Company Receiving Types of Services Rendered Total Amount Billed Services Services ------------------------------------------------------------------------------------------------------------------- (thousands of dollars) ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Business Services Security System 46 Company ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Commonwealth Edison Company Maintenance and Construction 17 Services ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Energy Company IT Services/Facility Charges 97 ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Enterprises Company, IT Services/Facility Charges 23 LLC ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Exelon Business Services Group Construction Services 240 ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc. Commonwealth Edison Company Security System 26 ------------------------------------------------------------------------------------------------------------------- Exelon Services, Inc PECO Energy Company Security System 37 ------------------------------------------------------------------------------------------------------------------- Exelon Services Federal Commonwealth Edison Company Construction / Project 4,395 Group, Inc. Management ------------------------------------------------------------------------------------------------------------------- Exelon Services Federal PECO Energy Company Construction / Project 481 Group, Inc. Management ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Development, Northwind Aladdin LLC Plant Operators 76 Inc. ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Aladdin LLC Administrative and General 8 Inc. ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Aladdin LLC Plant Management 39 Inc. ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Chicago LLC District Cooling 255 Inc. ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Chicago LLC Plant Operators 85 Inc. ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Chicago LLC Rent 27 Inc. ------------------------------------------------------------------------------------------------------------------- Exelon Thermal Technologies, Northwind Midway LLC Plant Operators 141 Inc. ------------------------------------------------------------------------------------------------------------------- Northwind Chicago, LLC Exelon Thermal Technologies, Cooling 888 Inc. ------------------------------------------------------------------------------------------------------------------- Exelon Power Labs, LLC Exelon Generation Company, LLC Measuring & test equipment, 2,077 technical services ------------------------------------------------------------------------------------------------------------------- Exelon Power Labs, LLC Exelon Energy Company Measuring & test equipment, 205 technical services ------------------------------------------------------------------------------------------------------------------- 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 Business Services Company F&M Holdings Company Legal 207 ------------------------------------------------------------------------------------------------------------------------ Exelon Enterprises Company, LLC Exelon Thermal Technologies, Inc. Payroll - Executive 21 ------------------------------------------------------------------------------------------------------------------------ Exelon Business Services Company F&M Holdings Company Legal, IT and accounting 2 ------------------------------------------------------------------------------------------------------------------------ Exelon Business Services Company Exelon Thermal Technologies, Inc. Legal 118 ------------------------------------------------------------------------------------------------------------------------ Commonwealth Edison Company Exelon Services Federal Group, Inc. Management fee 33 ------------------------------------------------------------------------------------------------------------------------ Exelon Power Labs, LLC Exelon Energy Company Measuring & test 205 equipment, technical services ------------------------------------------------------------------------------------------------------------------------ 6 ITEM 4. SUMMARY OF AGGREGATE INVESTMENT March 31, 2004 (in thousands) Investments in energy-related companies: Total consolidated capitalization of Exelon Corporation as of March 31, 2004 $25,095,000 Line 1 Total capitalization multiplied by 15% (line 1 multiplied by 0.15) $ 3,764,250 Line 2 Greater of $50 million or line 2 3,764,250 Line 3 Total current aggregate investment subsequent to October 20, 2000 (categorized by major line of energy-related business): Energy-related business category 2 179,348 Energy-related business category 5 249,722 Energy-related business category 6 59,501 Energy-related business category 7 375,083 Energy-related business category 9 6,349 Energy-related business category 10 32 Total current aggregate investment 870,034 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) $ 2,894,216 Line 5 ========= Investments in gas-related companies: NONE 7 ITEM 5. OTHER INVESTMENTS Filed under confidential treatment pursuant to Rule 104(b). 8 ITEM 6 - FINANCIAL STATEMENTS AND EXHIBITS Financial Statements -------------------- (1) Exhibit A-1 Statement of Income of Exelon Services, Inc. for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (2) Exhibit A-2 Balance Sheet of Exelon Services, Inc. at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (3) Exhibit A-3 Statement of Income of Exelon Thermal Holdings, Inc. for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (4) Exhibit A-4 Balance Sheet of Exelon Thermal Holdings, Inc. at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (5) Exhibit A-5 Statement of Income of Unicom Power Holdings, Inc. for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (6) Exhibit A-6 Balance Sheet of Unicom Power Holdings, Inc. at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (7) Exhibit A-7 Statement of Income of Unicom Power Marketing, Inc. for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (8) Exhibit A-8 Balance Sheet of Unicom Power Marketing, Inc. at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (9) Exhibit A-9 Statement of Income of Adwin Equipment Company for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (10) Exhibit A-10 Balance Sheet of Adwin Equipment Company at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (11) Exhibit A-11 Statement of Income of F&M Holdings Company, LLC for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (12) Exhibit A-12 Balance Sheet of F&M Holdings Company, LLC at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (13) Exhibit B-1 Statement of Income of Penesco Company, LLC for three months and six months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (14) Exhibit B-2 Balance Sheet of Penesco Company, LLC at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (15) Exhibit B-3 Statement of Income of Cenesco Company, LLC for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). 9 (16) Exhibit B-4 Balance Sheet of Cenesco Company, LLC at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (17) Exhibit B-5 Statement of Income of Exelon Allowance Management Co. for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (18) Exhibit B-6 Balance Sheet of Exelon Allowance Management Co. at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (19) Exhibit B-7 Statement of Income of ExTex Marketing, LLC for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (20) Exhibit B-8 Balance Sheet of ExTex Marketing, LLC at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (21) Exhibit B-9 Statement of Income of ExTex Power, LP for the three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (22) Exhibit B-10 Balance Sheet of ExTex Power, LP at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (23) Exhibit B-11 Statement of Income of Exelon New England Power Marketing LP for the three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (24) Exhibit B-12 Balance Sheet of Exelon New England Power Marketing LP at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (25) Exhibit B-13 Statement of Income of Exelon New England Power Services, Inc. for the three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (26) Exhibit B-14 Balance Sheet of Exelon New England Power Services, Inc. at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (27) Exhibit B-15 Statement of Income of Exelon Hamilton for the three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (28) Exhibit B-16 Balance Sheet of Exelon Hamilton at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (29) Exhibit B-17 Statement of Income of Exelon Boston Services, LLC for the three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (30) Exhibit B-18 Balance Sheet of Exelon Boston Services, LLC at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (31) Exhibit B-19 Statement of Income of Exelon Energy Company for three and twelve months ended March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). (32) Exhibit B-20 Balance Sheet of Exelon Energy Company at March 31, 2004 - filed under confidential treatment pursuant to Rule 104(b). 10 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: May 28, 2004 Exelon Corporation Registrant By:/s/ Matthew F. Hilzinger ------------------------- Vice President and Corporate Controller With the above signature, I also hereby certify that the corresponding report on Form U-9C-3 for the first quarter of 2004 has been filed with Exelon Corporation's interested state commissions whose names and addresses are listed below. Donna Caton, Chief Clerk Illinois Commerce Commission 527 East Capitol Avenue Springfield, Illinois 62706 James J. McNulty, Secretary Pennsylvania Public Utility Commission P.O. Box 3265 Harrisburg, Pennsylvania 17105-3265 11