United States
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



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In the Matter of Exelon Corporation                 CERTIFICATE OF NOTIFICATION

File No. 70-9645

Public Utility Holding Company Act of 1935  (PUHCA)

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         Exelon Corporation, a Pennsylvania corporation and registered holding
company (Exelon), hereby submits the following Certificate of Notification
pursuant to Rule 24. This filing is made pursuant to Exelon's Form U-1
Application-Declaration, as amended (the "Merger U-1") dated October 18, 2000
and the Commission's Order dated October 19, 2000. This certificate reports
information concerning associate company services provided during the period
from January 1, 2001 through June 30, 2001. Any capitalized terms used herein
but not defined have the respective meanings given in the Merger U-1 or in the
Commission's Order.

See attached spreadsheet for:

         1.   List of companies providing services;
         2.   List of companies receiving services;
         3.   A description of the type of services provided;
         4.   The dollar amount of the services provided, by category;
         5.   A description of the method of charging for services, i.e., cost,
              or, if permitted, other than cost;
         6.   A reference to the agreement under which such services were
              provided and transfer charges were based.



                                    SIGNATURE

         Pursuant to the requirements of PUHCA, the undersigned company has duly
caused this document to be signed on its behalf by the undersigned thereunto
duly authorized.

Date:    August 31, 2001
                                              EXELON CORPORATION


                                              By: /s/ Jean H. Gibson
                                                  ------------------------------
                                                  Vice President and Controller


Exelon Corporation - Rule 24-Cert - Associated Company Services - January 1, through June 30, 2001 Date Filed: 8/31/2001 - -------------------------------------------------------------------------------- Company Company Dollar Transfer Providing Receiving Description Amount Price Controlling Services Services Of Services Of Services Standard Agreement -------- -------- ----------- ----------- -------- --------- Commonwealth Edison Company Exelon Business Services Company Facility Services $2,438,800 Cost AIA Commonwealth Edison Company Exelon Business Services Company Fixed Asset Acctg. Services $ 5,028 Cost AIA Commonwealth Edison Company Exelon Business Services Company Fleet Services $ 42,129 Cost AIA Commonwealth Edison Company Exelon Business Services Company PIC Pymt Proc. & Exceptions $ 33,289 Cost AIA Commonwealth Edison Company Exelon Business Services Company Printing, mail, copying etc $ 279,196 Cost AIA Commonwealth Edison Company Exelon Business Services Company Facility Services $ 616,147 Cost AIA Commonwealth Edison Company Exelon Business Services Company Fleet Services $ 4,832 Cost AIA Commonwealth Edison Company Exelon Business Services Company Printing, mail, copying etc $ 24,373 Cost AIA Commonwealth Edison Company Exelon Enterprises Company, LLC Facility Services $ 68,506 Cost AIA Commonwealth Edison Company Exelon Enterprises Company, LLC Offsite Fac. Rental Usage $ 2,118 Cost AIA Commonwealth Edison Company Exelon Enterprises Company, LLC Offsite Fac. Rental Usage $ 2,118 Cost AIA Commonwealth Edison Company Exelon Enterprises Company, LLC PIC Pymt Proc. & Exceptions $ 3,680 Cost AIA Commonwealth Edison Company Exelon Enterprises Company, LLC Real Estate Services $ 617 Cost AIA Commonwealth Edison Company Exelon Generation Company, LLC Central Mapping (Blueprints) $ 126,726 Cost SEC Order Commonwealth Edison Company Exelon Generation Company, LLC Equipment Metering $1,715,731 Cost SEC Order Commonwealth Edison Company Exelon Generation Company, LLC Facility Services $ 140,364 Cost SEC Order Commonwealth Edison Company Exelon Generation Company, LLC Fixed Asset Acctg. Services $ 36,323 Cost SEC Order Commonwealth Edison Company Exelon Generation Company, LLC Fleet Services $ 469,716 Cost SEC Order Commonwealth Edison Company Exelon Generation Company, LLC Legislative Services $ 12,710 Cost SEC Order Commonwealth Edison Company Exelon Generation Company, LLC Offsite Fac. Rental Usage $ 15,356 Cost SEC Order Commonwealth Edison Company Exelon Generation Company, LLC PIC Pymt Proc. & Exceptions $ 109 Cost SEC Order Commonwealth Edison Company Exelon Generation Company, LLC Printing, mail, copying etc $ 131,224 Cost SEC Order Commonwealth Edison Company Exelon Generation Company, LLC Real Estate Services $ 45,148 Cost SEC Order Commonwealth Edison Company PECO Energy Company Marketing Services $ 236,940 Cost AIA Commonwealth Edison Company PECO Energy Company Supply/Purchasing Services $ 156,423 Cost AIA Commonwealth Edison Company Unicom Mechanical Service Inc. Energy Consulting Services $ 976,042 Mkt. Rate AIA Commonwealth Edison Company Unicom Mechanical Service Inc. Offsite Fac. Rental Usage $ 9,531 Cost AIA Commonwealth Edison Company UT Holdings, Inc. Offsite Fac. Rental Usage $ 3,707 Cost AIA -------------- Total $ 7,596,882 ============== Exelon Thermal Technologies Inc. Northwind Midway LLC Engineering $ 203,498 Cost (a) Exelon Thermal Technologies Inc. Northwind Chicago LLC District cooling $ 255,000 Market (b) Exelon Thermal Technologies Inc. Northwind Chicago LLC Administrative and general $ 284,193 Cost (c) Exelon Thermal Technologies Inc. Northwind Chicago LLC Engineering $ 292,675 Cost (c) Exelon Thermal Technologies Inc. Northwind Chicago LLC Plant operators $ 110,373 Market (c) -------------- Total $ 1,145,739 ============== (a) Management Services Agreement between Unicom Thermal Technologies Inc. and Northwind Midway, LLC dated June 25, 1999. (b) District Cooling System Use Agreement between Unicom Thermal Technologies, Inc. and Northwind Chicago LLC dated May 19, 2000. (c) Management Services Agreement between Unicom Thermal Technologies Inc. and Northwind Chicago LLC dated May 19, 2000. Northwind Chicago LLC Exelon Thermal Technologies Inc. Chilled water $ 2,753,354 Market (a) (a) Chilled Water Service Agreement between Northwind Chicago LLC and Exelon Thermal Technologies Inc. (formerly Unicom Thermal Technologies Inc.). Blair Park Services Inc. PECO Hyperion Telecommunications Infrastructure services $ 470,877 Market (a) (a) Purchase Order No. 01026797 to Blair Park Services, Inc., commencing November 1, 1999. Exelon Infrastructure Services of Pennsylvania, Inc. PECO Energy Company Construction services $13,396,876 Market (a) (b) (c) (a) Electric and Gas Supply Operating Agreement between Exelon Infrastructure Services of PA, Inc., and PECO Energy Company, dated October 1, 1999. SEC Order and MSA. (b) Outdoor Lighting Services Operating Agreement between Exelon Infrastructure Services of PA, Inc. and PECO Energy Company, dated September 23, 1999. SEC Order and MSA. (c) Aerial Pole Attachment Process Operating Agreement between PECO Energy Distribution Company and Exelon Infrastructure Services, dated November 1, 1999. SEC Order and MSA. VSI Group Inc. PECO Energy Company Transfer work and meter reading $9,267,910 Market (a) (a) Purchase Order No. 01014646 from PECO Energy Co. to VSI Group, commencing May 1, 1998. SEC Order and MSA. M.J. Electric, Inc. Commonwealth Edison Company Electrical maintenance services $17,621,971 Market (a) (a) Contracts for continuing electrical maintenance services for from March 1999 through June 2001. SEC order and AIA. Unicom Thermal Development Inc. Northwind Aladdin LLC Administrative and general $ 190,990 Cost (a) Unicom Thermal Development Inc. Northwind Midway LLC Administrative and general $ 50,256 Cost (b) Unicom Thermal Development Inc. Northwind Las Vegas LLC Administrative and general $ 71,581 Cost (c) Unicom Thermal Development Inc. Northwind Windsor LLC Administrative and general $ 13,547 Cost (d) Unicom Thermal Development Inc. Exelon Thermal Technologies Inc. Administrative and general $ 81,719 Cost (e) Unicom Thermal Development Inc. Northwind Chicago LLC Administrative and general $ 557,406 Cost (f) Unicom Thermal Development Inc. Unicom Power Holdings inc. Office rent $ 59,677 Cost (g) Unicom Thermal Development Inc. Northwind Houston LP Administrative and general $ 53 Cost (h) -------------- Total $ 1,025,229 ============== (a) Management Services Agreement between Unicom Thermal Development Inc. and Northwind Aladdin LLC dated January 1, 2001. SEC Order. (b) Management Services Agreement between Unicom Thermal Technologies Inc. and its associates (Unicom Thermal Development Inc.), and Northwind Midway, LLC dated June 25, 1999. SEC Order. (c) Management Services Agreement between Unicom Thermal Development Inc. and Northwind Las Vegas LLC dated January 1, 2001. SEC Order. (d) Management Services Agreement between Unicom Thermal Technologies Inc., a New Brunswick corporation, and Northwind Windsor LLC dated September 1, 1997. SEC Order. (e) Management Services Agreement between Unicom Thermal Development Inc. and Exelon Thermal Technologies Inc. dated March 1, 2001. SEC Order. (f) Management Services Agreement between Exelon Thermal Technologies Inc. (formerly Unicom Thermal Technologies Inc.) and its associates (Unicom Thermal Development Inc.), and Northwind Chicago LLC dated May 19, 2000. SEC. (g) Office Rent Affiliate Level Arrangement between Unicom Thermal Development Inc. and Unicom Power Holdings Inc. SEC Order. (h) Management Services Agreement between Unicom Thermal Development Inc. (formerly Northwind Development Inc.) and Northwind Houston L.P. dated February 6, 1997. SEC Order. Unicom Energy Government Pass Through - Services Inc. Commonwealth Edison Company Energy Mgmt. $ 3,856,206 Market (a) Unicom Energy Services Inc. Exelon Energy Company Energy forecasting $ 25,180 Cost (b) ------------ Total $ 3,881,385 ============ (a) Energy Management Services Agreement between Unicom Energy Services Inc. and Commonwealth Edison Company dated December 29, 1998. SEC Order and AIA. (b) Energy Forecasting and Monitoring Affiliate Level Arrangement between Unicom Energy Services Inc. and Exelon Energy Inc. SEC Order. Exelon Enterprises Company, LLC. Unicom Energy Services, Inc. IT Services $ 54,775 Cost (a) Exelon Enterprises Company, LLC. Exelon Services Inc. IT Services $ 261,631 Cost (a) Exelon Enterprises Company, LLC. Exelon Energy Inc. IT Services $ 128,135 Cost (b) Exelon Enterprises Exelon Infrastructure Company, LLC. Services, Inc. IT Services $ 475,937 Cost (c) Exelon Enterprises Exelon Infrastructure Company, LLC. Services, Inc. Supply services $ 82,853 Cost SOW-2-01-01-B (d) Exelon Enterprises Company, LLC. Exelon Energy Inc. Marketing $ 14,982 Cost EXENT-MKT-1 (d) Exelon Enterprises Company, LLC. Unicom Thermal Development Inc. Administrative and general $ 98,988 Cost EXENT-2 (d) ------------ Total $ 1,117,302 ============ (a) Information Technology Service Level Arrangement between Exelon Enterprises Company, LLC and Exelon Services Inc., dated as of June 25, 2001. SEC Order. (b) Affiliate Level Arrangement for IT Strategy, Technology Asset Tracking & Reporting, and Videoconferencing. SEC Order. (c) Affiliate Level Arrangement for Technology Administration, Technology Asset Tracking & Reporting, Long Term Financial System Strategy, Disaster Recovery, IT Documentation Services, IT Management Support, Procedures Definition, and IT Security Review. SEC Order. (d) SEC Order. AT&T Wireless PCS of Philadelphia, LLC Exelon Business Services Company Telecommunications service $ 49,947 Market (a) (a) AT&T Business Select-Master Agreement as amended, between PECO Energy Company and AT&T Wireless PCS of Philadelphia, LLC, effective as of January 1, 2000. SEC Order. Exelon Services, Inc. Commonwealth Edison Company Governmental Pass Through - Energy Management. $ 8,141,039 Market (a) Exelon Services, Inc. Commonwealth Edison Company Electrical maintenance services. $ 22,786 Market (b) Exelon Services, Inc. Commonwealth Edison Company Installation of security systems. $ 690,551 Market (c) Exelon Services, Inc. Commonwealth Edison Company Environmental and electrical system installation and maintenance. $ 185,431 Market (d) Exelon Services, Inc. Exelon Generation Company, LLC Ventilation System Construction. $ 14,220 Market (e) Exelon Services, Inc. Exelon Thermal Technologies Inc. Installation of environmental equipment. $ 401,658 Market (f) ------------- Total $ 9,455,685 ============= (a) Energy Management Services Agreement between Exelon Services, Inc. (formerly Unicom Energy Services Inc.) and Commonwealth Edison Company dated December 29, 1998. SEC and AIA. (b) Maintenance Agreement between Exelon Services, Inc. (formerly Midwest Mechanical) and ComEd, dated October 19, 1999. SEC and AIA. (c) Services and Materials Agreement between Commonwealth Edison Company and Exelon Services, Inc. (formerly Access Systems, Inc.), dated March 6, 2000. SEC and AIA. (d) Project Agreement between Exelon Services (dba Midwest Mechanical) and Jones Lang LaSalle (agent for Commonwealth Edison Company) dated December 2, 2000. SEC and AIA. (e) Purchase Order 00018493 dated October 25, 2000, and Contract # 24910. SEC Order. (f) Purchase Order 5927 and Turnkey Construction Agreement between Exelon Thermal Technologies Inc. and Exelon Services Inc. (dba Midwest Mechanical) dated June 4, 2001. SEC Order. PECO Energy Company Exelon Business Services Company Purchase of Materials / Logistics $ 28,986 Cost MSA PECO Energy Company Exelon Business Services Company Purchase / Lease / Maintain Vehicles $ 93,575 Cost MSA PECO Energy Company Exelon Business Services Company Environmental & Lab Services $ 16,035 Cost MSA PECO Energy Company Exelon Business Services Company Training: Electrical & Fire $ 1,224 Cost MSA PECO Energy Company Exelon Business Services Company Real Estate Purchase & Lease Trans $ 2,040,208 Cost MSA PECO Energy Company Exelon Business Services Company Purchase of Materials / Logistics $ 150,252 Cost MSA PECO Energy Company Exelon Business Services Company Purchase / Lease / Maintain Vehicles $ 19,280 Cost MSA PECO Energy Company Commonwealth Edison Company Purchase of Materials / Logistics $ 1,453,656 Cost MSA PECO Energy Company Exelon Enterprises Company, LLC Purchase of Materials / Logistics $ 3,100 Cost MSA PECO Energy Company Exelon Enterprises Company, LLC Purchase / Lease / Maintain Vehicles $ 96,274 Cost MSA PECO Energy Company Exelon Enterprises Company, LLC Training: Electrical & Fire $ 1,224 Cost MSA PECO Energy Company Exelon Enterprises Company, LLC Real Estate Purchase & Lease Trans $ 538,377 Cost MSA PECO Energy Company Exelon Enterprises Company, LLC Install & Maintain Substation Equip $ 178,901 Cost MSA PECO Energy Company Exelon Enterprises Company, LLC Purchase of Materials / Logistics $ 454,555 Cost MSA PECO Energy Company Exelon Generation Company Purchase of Materials / Logistics $ 123,862 Cost MSA PECO Energy Company Exelon Generation Company Purchase / Lease / Maintain Vehicles $ 360,813 Cost MSA PECO Energy Company Exelon Generation Company Environmental & Lab Services $ 5,173 Cost MSA PECO Energy Company Exelon Generation Company Training: Electrical & Fire $ 75,863 Cost MSA PECO Energy Company Exelon Generation Company Real Estate Purchase & Lease Trans $ 26,399 Cost MSA PECO Energy Company Exelon Generation Company Consulting Services $ 1,648 Cost MSA PECO Energy Company Exelon Generation Company Consulting Services $ 2,756 Cost MSA ----------- Total $ 5,672,161 =========== Exelon Generation 1. Support AmerGen's nuclear acquisition Company, LLC AmerGen Energy Company effort, 2.Outline of service provided by GENCO to AmerGen $ 4,461,550 Cost SEC Order Exelon Generation Company, LLC Exelon Energy Delivery - PECO Calibration, repair, and procurement of measuring and testing equipment $ 187,502 Cost SEC Order Exelon Generation Company, LLC Exelon Energy Delivery - ComEd Maintenance of the Zion U-1 and U-2 Synchronous Condensers $ 624,665 Cost SEC Order Exelon Generation Operate and Maintain 25 cycle Frequency Company, LLC Exelon Energy Delivery - PECO Converters located at Richmond Station, Lamokin and Somerset. $1,708,000 Cost SEC Order Exelon Generation Company, LLC Exelon Energy Delivery - PECO Welder training and certification $4,884 Cost SEC Order Exelon Generation Company, LLC Exelon Energy Delivery - PECO. Training for: compliance, maintenance, Business Services Company development and implementation, records Oregon Shops and administrative activities $670 Cost SEC Order Exelon Generation Company, LLC Exelon Energy Delivery - PECO Rental of Eddystone Training Center Building $27,000 Cost SEC Order Exelon Generation Company, LLC Exelon Energy Delivery- PECO Troubleshoot and repair custom-built underground cable fault locating equipment $3,281 Cost SEC Order ============== Total $ 7,017,552 ============== Acronyms - -------- AIA Affiliated Interests Agreement (Transactions between ComEd and associates) SEC Order Order dated October 19, 2000 approving the merger and other associate matters. MSA Mutual Services Agreement (Services between PECO and associates)