UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549






                                    FORM U5S
                                 Amendment No. 1






                                  ANNUAL REPORT

                      For the Year Ended December 31, 2000



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










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


                            PECO ENERGY POWER COMPANY
                               2301 Market Street
                        Philadelphia, Pennsylvania 19101



                            Glossary of Defined Terms

ComEd                       Commonwealth Edison Company

Commission                  Securities and Exchange Commission

Exelon Enterprises          Exelon Enterprises Company, LLC

Exelon                      Exelon Corporation

Exelon Generation           Exelon Generation Company, LLC

Financing U-1               The Form U-1 Application/Declaration filed by Exelon
                            Corporation in File No. 70-9693

Merger U-1                  The Form U-1 Application/Declaration filed by Exelon
                            Corporation in File No. 70-9645

N/A                         Not applicable or not available

PECO                        PECO Energy Company

PEPCO                       PECO Energy Power Company


SECO                        Susquehanna Electric Company

Unicom                      Unicom Corporation



Amendment No. 1 to the Form U5S amends and restates the Form U5S filed by Exelon
on May 1, 2001, in its entirety. The filing incorporates information previously
filed and additional information that was unavailable at the time of the initial
filing.

ITEM 1.   SYSTEM COMPANIES AND INVESTMENTS THEREIN.
The Corporate structure shown is as of April 18, 2001, reflecting corporate
restructuring undertaken between January 1, 2001 and April 18, 2001. Owner's
book value is as of December 31, 2000. This item has been updated to reflect the
effects of the restructuring.



Name of Company                                         Number of Common  % Voting Power    Owner's Book
                                                          Shares Owned                       Value ($000)
----------------------------------------------------------------------------------------------------------
                                                                                      
Exelon Corporation                                                                100%
  (Affordable Housing Investments)                                                                 92,082
  Boston Financial Institutional Tax Credit Fund X                 -               11%
  Related Corporate Partners IV, L.P.                              -      less than 5%
  Boston Financial Institutional Tax Credit Fund XIX               -               14%
  Related Corporate Partners XII, L.P.                             -               36%
  Boston Financial Institutional Tax Credit Fund XIV               -               44%
  Boston Financial Institutional Tax Credit Fund XXI               -               27%
  Related Corporate Partners XIV, L.P.                             -               16%
  Summit Corporate Tax Credit Fund II                               -              33%
  USA Institutional Tax Credit Fund XXII                           -               30%
Exelon Energy Delivery Company, LLC                                               100%
  Commonwealth Edison Company                            128,033,227    less than 100%          5,691,907
    Commonwealth Edison Company of Indiana, Inc.           1,108,084              100%             30,918
    ComEd Financing I                                              -              100%             15,631
    ComEd Financing II                                             -              100%             14,515
    ComEd Funding, LLC                                             -              100%             86,536
      ComEd Transitional Funding Trust                             -              100%                N/A
    Commonwealth Research Corporation                            200              100%                200
    Edison Development Company                                   741              100%             16,586
    Edison Development Canada Inc.                             2,600              100%              5,499
      Edison Finance Partnership                                   -              100%                N/A
  PECO Energy Company                                    170,478,507              100%            172,918
    PECO Energy Capital Corp.                                  1,000              100%             17,640
      PECO Energy Capital, LP                                                       3%             13,968
      PECO Energy Capital Trust II                                                100%                N/A
      PECO Energy Capital Trust III                                               100%                N/A
    PECO Energy Transition Trust                                                  100%            149,901
    ExTel, LLC                                                                    100%           (229,504)
      PECO Finance                                                                 99% PECO;     (227,208)
                                                                                    1% Extel       (2,295)
        ATNP Finance Company                                                      100%          4,324,366
        PEC Financial Services, LLC                                               100%             12,918
    Adwin Realty Company                                       1,000              100%             22,628
      Ambassador II Joint Venture                                                  50%                N/A
      Bradford Associates                                                          50%                N/A
      Franklin Town Towers Associates                                              50%                N/A
      Henderson Ambassador Associates                                              50%                N/A
      Riverwatch                                                                  100%                N/A
      Route 724                                                                   100%                N/A
      Signa                                                                       100%                N/A
    East Coast Natural Gas Cooperative, LLP                                     41.12%                360
Horizon Energy Company                                         1,000              100%                N/A
Unicom Invesment Inc.                                            100              100%
    Scherer Holdings 1, LLC                                        -               100%            49,002
    Scherer Holdings 2, LLC                                        -              100%             24,992
    Scherer Holdings 3, LLC                                        -              100%             73,989
    Spruce Holdings G.P. 2000, LLC                                 -              100%              1,841
    Spruce Holdings L.P. 2000, LLC                                 -              100%            182,231
      Spruce Equity Holdings, L.P.                                 -                1% Spr GP;    184,072
                                                                                   99% Spr LP
        Spruce Holdings Trust                                      -              100%            184,072
    Wansley Holdings 1, LLC                                        -              100%             41,941
    Wansley Holdings 2, LLC                                        -              100%             21,387
  Unicom Resources Inc.                                          100              100%            (13,842)
Exelon Ventures Company, LLC                                                      100%
  Exelon Generation Company, LLC                                                  100%          4,551,000
     PECO Energy Power Company                               984,000              100%             24,600
      Susquehanna Power Company                            1,273,000              100%             47,047
        The proprietors of the Susquehanna Canal                                  100%                N/A
    Susquehanna Electric Company                               1,000              100%             10,000
    AmerGen Energy Company, LLC                                                    50%
      AmerGen Venture, LLC                                                        100%
    Exelon (Fossil) Holdings, Inc.                                                100%
      Sithe Energies, Inc.                                                      49.90%
    Exelon Peaker Development General, LLC                                        100%                N/A
    Exelon Peaker Development Limited, LLC                                        100%                N/A
      ExTex LaPorte Limited Partnership                                             1% EP Gen         N/A



                                                                                   99% EP Lim         N/A
    Concomber Ltd                                                                 100%              1,200
  Exelon Enterprises Company, LLC                                100              100%            625,500
    Exelon Energy Company                                        100              100%            (25,400)
      Exelon Energy Ohio, Inc.                                 1,000              100%             13,483
      AllEnergy Gas & Electric Marketing Company, LLC            N/A              100%             19,253
        Texas Ohio Gas, Inc.                                                      100%             (1,611)
    Exelon Services, Inc.                                        100              100%              9,477
       Systems Engineering and Management Corporation, Inc       874              100%              7,134
    Unicom Power Holdings, Inc.                                  100              100%            (20,244)
    Unicom Power Marketing, Inc.                                 100              100%                N/A
    Unicom Healthcare Management, Inc.                         1,110              100%              1,829
    UT Holdings, Inc.                                            100              100%           (144,401)
      Northwind Chicago, LLC                                     N/A              100%             (5,974)
      Unicom Thermal Development, Inc.                           100              100%             (4,708)
      Exelon Thermal Technologies, Inc.                          100              100%            (83,272)
      Exelon Thermal Technologies Boston, Inc.                   100              100%             (4,373)
        Northwind Boston, LLC                                    N/A               25%                (62)
      Exelon Thermal Technologies Houston, Inc.                  100              100%               (947)
        Northwind Houston, LLC                                   N/A               25%                128
          Northwind Houston, LP                                  N/A               25%              8,860
      Exelon Thermal Technologies North America, Inc.             10              100%             (2,228)
        Northwind Thermal Technologies Canada, Inc.               10              100%             (1,561)
          Unicom Thermal Technologies Canada, Inc.                10              100%               (187)
      UTT National Power, Inc.                                   100              100%               (751)
        Northwind Midway, LLC                                    N/A              100%                N/A
      UTT Nevada, Inc.                                           100              100%                (50)
        Northwind Aladdin, LLC                                   N/A               75%             12,703
        Northwind Las Vegas, LLC                                 N/A               50%               (499)
      UTT Phoenix, Inc.                                          100              100%                N/A
        Northwind Arizona Development, LLC                       N/A               50%                N/A
        Northwind Phoenix, LLC                                   N/A               50%                N/A
Exelon Communications Holdings, LLC                                               100%            176,632
      AT&T Wireless PCS of Philadelphia, LLC                                       49%
      PHT Holdings, LLC                                                           100%             39,976
        PECO Hyperion Telecommunications                                           49%             38,776
      Exelon Communications Company, LLC                                          100%             22,258
    Energy Trading Company                                                        100%                257
    Exelon Enterprises Management, Inc.                                           100%            105,519
      UniGridEnergy, LLC                                                           50%
      CIC Global, LLC                                                              50%
      NEON Communications, Inc.                                                    10%
      VITTS Network Group, Inc.                                                    20%
      Exelon Capital Partners, Inc.                                               100%             83,007
        Permits Now (fka Softcomp)                                                 16%
        OmniChoice.com, Inc.                                                       30%
        Enertech Capital Partners II                                               11%
        Everest Broadband Networks                                                 15%
    Exelon Infrastructure Services, Inc.                                less than 100%            515,266
      Exelon Infrastructure Services of Pennsylvania, Inc.                        100%              6,938
        EIS Engineering, Inc.                                                     100%
          P.A.C.E Field Services, LLC                                             100%              8,135
          P.A.C.E Environmental, LLC                                              100%
      Chowns Communication, Inc.                                 N/A              100%             11,893
      Fischbach and Moore Electric, Inc.                         N/A              100%
      MRM Technical Group, Inc.                                  N/A              100%            121,556
        Aconite Corporation                                                       100%
        Gas Distribution Contractors, Inc.                                        100%
        Mid-Atlantic Pipeliners, Inc.                                             100%
        Mueller Distribution Contractors, Inc.                                    100%
        Mueller Energy Services, Inc.                                             100%
        Mueller Pipeliners, Inc.                                                  100%
        Mechanical Specialties Incorporated                                       100%
        Rand-Bright Corporation                                                   100%
      Syracuse Merit Electric, Inc.                              N/A              100%             15,297
      NEWCOTRA, Inc.                                             N/A              100%
        Fischbach and Moore, Inc.                                                 100%              7,001
          Fischbach and Moore Electrical Contractors, Inc.                        100%
          T.H. Green Electric Co., Inc.                                           100%
      Trinity industries, Inc.                                   N/A              100%             11,322
      OSP Consultants, Inc.                                      N/A              100%             68,116
        International Communications Services, Inc.                               100%
        OSP, Inc.                                                                 100%
        OSP Servicios, S.A. de C.V.                                               100%
        OSP Telecom, Inc.                                                         100%
        OSP Telcomm de Mexico, S.A. de C.V.                                       100%
        OSP Telcom de Columbia, LTDA                                              100%
        OSP Telecommunications, Ltd.                                              100%
        RJE Telecom, Inc.                                                         100%
        Utilities Locate & Mapping Services, Inc.                                 100%
        Universal Network Services, Inc.                                           49%
      Dashiell Holdings Corporation                              N/A              100%             68,215
        Dashiell Corporation                                                      100%
          Dacon Corporation                                                       100%
      VSI Group, Inc.                                            N/A              100%             19,307
        International Vital Solutions Group, Inc.                                 100%
      Michigan Trenching Services, Inc.                          N/A              100%             14,994
      Lyons Equipments, Inc.                                     N/A              100%



      M.J. Electric, Inc.                                                         100%            143,906
      Electric Services, Inc.                                                     100%              7,443
      EIS Investments, LLC                                                        100%
        WCB Services, LLC                                                          49%
    Adwin Equipment Company                                      N/A              100%              4,291
    Kinetic Ventures Fund I, LLC                                                22.22%
    Kinetic Ventures Fund II, LLC                                               17.64%
Unicom Assurance Company Ltd. (Inactive)                         N/A              100%                N/A

     N/A Not applicable or Not Available



ITEM 2.   ACQUISITIONS OR SALES OF UTILITY ASSETS

NONE


ITEM 3.   ISSUE, SALE, PLEDGE, GUARANTEE OR ASSUMPTION OF SYSTEM SECURITIES

None in addition to those reported in Exelon's Rule 24 certificates.


ITEM 4.   ACQUISITION, REDEMPTION OR RETIREMENT OF SYSTEM SECURITIES

A.   PECO Energy Company - Debt Retirements

1.   On November 14, 2000, PECO retired, with cash, upon maturity, its $38.5
     million principal amount variable rate note.

B.   Commonwealth Edison Company - Redemption of Securities

2.   In the fourth quarter of 2000, ComEd repurchased 19.9 million of its common
     shares from Unicom in exchange for an $850 million note receivable ComEd
     held from Unicom Investment, Inc.

C.   Exelon Enterprise's Acquisitions (previously filed confidentially on Form
     SE)


ITEM 5.   INVESTMENTS IN SECURITIES OF NON-SYSTEM COMPANIES AS OF DECEMBER 31,
          2000.



Investor               Investee                              Type               Quantity      Cost         Carrying Value
--------------------------------------------------------------------------------------------------------------------------

                                                                                             
ComEd            Chicago Community Ventures, Inc.      Common Shares               500         $50,000          $50,000

ComEd            Chicago Equity Fund                   Limited Partnership         N/A      $1,390,514       $1,390,514

ComEd            Dearborn Park Corporation             Common Shares            10,000        $537,654         $537,654

ComEd            I.L.P. Fund C/O Chicago Capital Fund  Venture Capital Small       N/A        $250,000         $250,000
                                                       Business Fund

ComEd            Illinois Venture Fund (Unibanc Trust) Venture Capital Fund        N/A         $71,320          $71,320

Exelon           Phoenix Foods, LLC                    Limited Liability
Enterprise                                             Company                     N/A
Management, Inc

Exelon           Pantellos Corporation                 Corporation                 N/A      $4,439,210       $4,439,210
Capital
Partners, Inc.

Exelon           Automated Power Exchange              Competitive Power     1,500,000      $3,000,000       $3,000,000
Capital                                                Exchange Business
Partners, Inc.

Exelon           UTECH Climate Challenge Fund, L.P.    Venture Capital             N/A      $4,582,713      $23,847,576
Capital                                                Investment
Partners, Inc.

Exelon           Exotrope                              Convertible Debentures      N/A        $500,000         $500,000
Capital
Partners, Inc.



Exelon           Media Station, Inc.                   Preferred plus          214,286      $1,500,000       $1,500,000
Capital                                                Warrants (Common)        48,702
Partners, Inc.

Energy           WorldWide Web NetworX Corporation     Common shares            73,450        $316,753           $9,181
Trading
Company

Energy           Entrade                               Common Shares           200,000      $1,489,115         $162,500
Trading
Company

N/A Not applicable



ITEM 6.   OFFICERS AND DIRECTORS - PART 1.

This item has been updated to reflect PEPCO officers and directors.

The positions of officers and directors of system companies as of December 31,
2000 were as follows:



Exelon Corporation
------------------

                           
Board of Directors

Edward A. Brennan
Carlos H. Cantu
Daniel L. Cooper
M. Walter D'Alessio
Bruce DeMars
G. Fred DiBona, Jr.
Sue Ling Gin
Richard H. Glanton
Rosemarie B. Greco
Edgar D. Jannotta
Corbin A. McNeill, Jr.
John M. Palms
John W. Rogers, Jr.
John W. Rowe
Ronald Rubin
Richard L. Thomas

Officers

McNeill, Jr., Corbin A.       Co-Chief Executive Officer and Chairman
Rowe, John W.                 Co-Chief Executive Officer and President
Kingsley Jr., Oliver D.       Executive Vice President
Egan, Michael J.              Executive Vice President
Strobel, Pamela B.            Executive Vice President
McLean, Ian P.                Senior Vice President
Mehrberg, Randall E.          Senior Vice President and General Counsel
Moler, Elizabeth A.           Senior Vice President, Government
                              Affairs-Federal
Padron, Honorio J.            Senior Vice President
Snodgrass, S. Gary            Senior Vice President and Chief Human
                              Resources Officer



Lawrence, Kenneth G.          Senior Vice President
Clark, Frank M.               Senior Vice President, Communications and
                              Public Affairs
Gillis, Ruth Ann M.           Senior Vice President and Chief Financial
                              Officer
Woods, David W.               Senior Vice President
Gibson, Jean                  Vice President and Corporate Controller
Haviland, Paul E.             Vice President, Corporate Development
McDonald, Robert K.           Vice President, Risk Management
Mitchell, J. Barry            Vice President and Treasurer
Combs, Katherine K.           Vice President and Corporate Secretary
Cesareo, David J.             Vice President, Environmental Health and
                              Safety
Kirchoffner, Donald P.        Vice President, Communications
Brown, Virginia A.            Vice President, Human Resources Planning
                              and Development
DaSilva, Assir R.             Vice President, Diversity
Diedrich, John F.             Vice President, Employee Health and
                              Benefits
Fonseca, Victor               Vice President, Compensation
Samolis, John R.              Vice President, Labor and
                              Employee Relations
Peters, Scott N.              Assistant Secretary
Cutler, Todd D.               Assistant Secretary
Shicora, George               Assistant Treasurer
Walls, Charles M.             Assistant Treasurer




COMED
-----

Officers

                           
McNeill, Jr, Corbin A         Co-Chief Executive Officer;
Rowe, John W                  Co-Chief Executive Officer and President ; Chairman
Kingsley Jr, Oliver D         EVP,  Nuclear and Chief Nuclear Officer
Strobel, Pamela B             EVP, Energy Delivery,
Clark, Frank M                Sr VP,  Distribution Cust/Mrktg Services & Ext Affairs
Crane, Christopher M          Sr VP, Nuclear Regional Operating Group 1
Gillis, Ruth Ann M            Sr VP, Finance and Chief Financial Officer
Helwig, David R               Sr VP, Nuclear Services
McLean, Ian P                 Sr VP, Power Team
Padron, Honorio J             Sr VP, Business Services



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



Settelen, John L              VP & Generation Controller
Spencer, Steven               VP, Business Services Finance
Stanley, Harold Gene          VP, Nuclear MW ROG Support
Talbot, Ronald E              VP, Distribution Regional Distributions, Operations
Terrell, Napoleon             VP, Business Services Human Resources
Tyne, Ray                     VP, Business Services Operations
Williams, James B             VP, Distribution Project & Contract Management
Dimmette, Joel P              Site VP - Quad Cities
Levis, William                Site VP - Byron
Pardee, Charles G             Site VP - LaSalle
Swafford, Preston D           Site VP - Dresden
Tulon, Timothy                Site VP - Braidwood
Mitchell, J Barry             VP and Treasurer
Shicora, George R             Assistant Treasurer
Walls, Charles S              Assistant Treasurer
Combs, Katherine K            Secretary
Cutler, Todd D                Assistant Secretary
Peters, Scott N               Assistant Secretary




PECO
----

Officers
                           
McNeill, Jr, Corbin A         Co-Chief Executive Officer and President; Chairman
Rowe, John W                  Co-Chief Executive Officer
Kingsley Jr, Oliver D         EVP, Nuclear and Chief Nuclear Officer
Egan, Michael J               EVP, Enterprises
Strobel, Pamela B             EVP, Energy Delivery
Cotton, John B                Sr VP, Nuclear Technical Support
Crane, Christopher M          Sr VP, Nuclear Regional Operating Group 1
Cucchi, Gregory A             Sr VP, Enterprises
Gillis, Ruth Ann M            Sr VP, Finance and Chief Financial Officer
Hagan, Joseph J               Sr VP, Nuclear Regional Operating Group 2
Jacobs, Christine A           Sr VP, Exelon Power
Lawrence, Kenneth G           Sr VP, Distribution
McElwain, John P              Sr VP, Nuclear Regional Operating Group 3
McLean, Ian P                 Sr VP, Power Team
Padron, Honorio J             Sr VP, Business Services
Rainey, Gerald R              Sr VP, Generation



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



McDermott, Cornelius J        VP, Generation Communications
Metzner, Michael              VP, Power Team Fiance/Analytics/Risk
Moscovitch, Ruth M            VP, Energy Delivery Strategic Initiatives
Muntz, James A                VP, Generation Special Projects
Murphy, Dennis E              VP, Enterprises Marketing and Business Development
Newman, Glenn                 VP, Enterprises General Counsel
O'Brien, Denis                VP, Distribution Operations
Settelen, John L              VP & Generation Controller
Spencer, Steven               VP, Business Services Finance
Stanley, Harold Gene          VP, Nuclear MW ROG Support
Terrell, Napoleon             VP, Business Services Human Resources
Tyne, Ray                     VP, Business Services Operations
Walters, Kathleen M           VP, Distribution Information Technology/CIO
White, Richard G              VP, Corporate Planning
Coyle, Michael                Site VP - Clinton Nuclear Power Station
Doering Jr., John             Site VP - Peach Bottom Atomic Power Station
Fetters, Drew B               Site VP - Vermont Yankee Nuclear Power Station
von Suskil, James D           Site VP - Limerick Generating Station
Warner, Mark E                Site VP - TMI
Mitchell, J Barry             VP and Treasurer
Shicora, George R             Assistant Treasurer
Walls, Charles S              Assistant Treasurer
Combs, Katherine K            Secretary
Cutler, Todd D                Assistant Secretary
Peters, Scott N               Assistant Secretary





Exelon Generation
-----------------

Officers

                           
McNeill, Jr, Corbin A         Chief Executive Officer and President Exelon
                              Generation
Kingsley, Jr, Oliver D        President and Chief Nuclear Officer, Exelon
                              Nuclear
McLean, Ian P                 President, Exelon Power Team
Skolds, John L                Chief Operating Officer, Exelon Nuclear
Bohlke, William H             Sr VP, Nuclear Services, Exelon Nuclear
Cotton, John B Sr             VP, Technical Support, Exelon Nuclear
Crane, Christopher M Sr       VP, MidWest Regional Operating Group, Exelon
                              Nuclear



Hagan, Joseph J               Sr VP, MidAtlantic Regional Operating Group,
                              Exelon Nuclear
Jacobs, Christine A           Sr VP, Exelon Generation; President, Exelon
                              Power
McElwain, John P              Sr VP, Exelon Nuclear
Woods, David W                Sr VP, Communications & Public Affairs, Exelon
                              Generation
Benjamin, Jeffrey A           VP, Licensing and Regulatory, Exelon Nuclear
Cornew, Kenneth W             VP, Long-term Transactions, Exelon Power Team
Cullen, Jr, Edward J          VP, General Counsel and Secretary
Erdlen, Michael               VP, Information Technology, Exelon Power Team
Freeman, Jan H                VP, Public Affairs, Exelon Generation
Guerra, James D               VP, Business Operations, Exelon Nuclear
Heffley, J Michael            VP, Nuclear Oversight, Exelon Nuclear
Ivey, Susan O                 VP, Short-term Transactions, Exelon Power Team
Jennings, Theodore E          VP, Outage & Project Management, Exelon Nuclear
Kray, Marilyn C               VP, Acquisition Support and Integration, Exelon
                              Nuclear
Landy, Richard J              VP, Human Resources & Administration, Exelon
                              Nuclear
Langenbach, James W           VP, Nuclear Station Support, Exelon Nuclear
Lewis, Charles P              VP, Strategy & Development, Exelon Generation
Malone, James P               VP, Nuclear Fuels, Exelon Nuclear
McDermott, Cornelius J        VP, Communications, Exelon Generation
Meister, James R              VP, Nuclear Engineering, Exelon Nuclear
Metzner, Michael              VP, Finance/Analytics/Risk, Exelon Power Team
Muntz, James A                VP, Special Projects, Exelon Generation
Settelen, John L              VP & Controller, Exelon Generation
Stanley, Harold Gene          VP, MidWest ROG Support, Exelon Nuclear
Heffley, J Michael Site       VP - Clinton Nuclear Power Station
Dimmette, Joel P              Site VP - Quad Cities Nuclear Power Station
DeGregorio, Ronald J          Site VP - Oyster Creek
Doering, Jr, John             Site VP - Peach Bottom Atomic Power Station
Fetters, Drew B               Site VP - Vermont Yankee Nuclear Power Station
Levis, William                Site VP - Byron Station
Pardee, Charles G             Site VP - LaSalle County Station
Swafford, Preston D           Site VP - Dresden Nuclear Power Station
Tulon, Timothy                Site VP - Braidwood Station
von Suskil, James D           Site VP - Limerick Generating Station



Warner, Mark E                Site VP - TMI
Berdelle, Robert E            VP, Generation
McDonald, Robert K            VP, Generation
Spencer, Steven L             VP, Business Services, Financial Services
Mitchell, J Barry             VP and Treasurer
Shicora, George R             Assistant Treasurer
Walls, Charles S              Assistant Treasurer
Cutler, Todd D                Assistant Secretary
Peters, Scott N               Assistant Secretary




Exelon Enterprises
------------------
                           
Officers

Rowe, John W                  Chair
Egan, Michael J               President & Chief Executive Officer
Beard, Kenneth H              VP, Exelon Enterprises & President, Energy
                              Services
Abromitis, James J            VP, Exelon Thermal Technologies
Cucchi, Gregory A             VP Exelon Enterprises & President, Exelon Infrastructure
                              Services & Telecommunications
Gilpin, Robert A              VP, Residential Energy
Hoekstra, Louis A             VP, Energy Solutions
Kampling, Patricia L          SVP & Chief Financial Officer
Murphy, Dennis E              VP, Marketing & Business Development
Newman, Glenn D               VP, General Counsel and Secretary
Rhodes, Gerald N              VP, Exelon Enterprises and President,
                              Exelon Energy
Rollo, Richard                VP, Strategic Planning
Rowe, E Kathleen              VP, Information Technology, Business
                              Services & Supply
Shinn, Robert A               VP, Exelon Capital Partners
Berdelle, Robert E            VP, Enterprises
McDonald, Robert K            VP, Enterprises
Spencer, Steven L             VP, Business Services, Financial Services
Mitchell, J Barry             VP and Treasurer
Shicora, George R             Assistant Treasurer
Walls, Charles S              Assistant Treasurer
Cutler, Todd D                Assistant Secretary
Peters, Scott N               Assistant Secretary






PEPCO
-----
                           
Board of Directors

Michael J. Egan
James A. Muntz
Gerald R. Rainey

Officers

Gerald R. Rainey              Chairman and President
Christine A. Jacobs           Vice President
Katherine K. Combs            Secretary
George R. Shicora             Treasurer
Thomas R. Miller              Assistant Treasurer
Edward J. Cullen, Jr.         General Counsel



ITEM 6.   OFFICERS AND DIRECTORS - PART II.

Financial Connections - The following is a list, as of December 31, 2000, of all
officers and directors of each system company who have financial connections
within the provisions of Section 17(c) of the Public Utility Holding Company Act
of 1935.

     1.   Edward A. Brennan: Member of Board of Directors of Unicom and ComEd
          from 1995 through the merger closing; member of Board of Directors of
          Exelon since the merger closing, and member of Board of Directors of
          Morgan Stanley Dean Witter & Co., investment banker. Authorized
          pursuant to Rule 70(b).

     2.   Carlos H. Cantu: Member of Board of Directors of Unicom and ComEd from
          1998 through the merger closing; member of Board of Directors of
          Exelon since the merger closing, and member of Board of Directors of
          First Tennessee National Corporation, commercial banking institution.
          Authorized pursuant to Rule 70(b).

     3.   Edgar D. Jannotta: Member of Board of Directors of Unicom and ComEd
          from 1994 through the merger closing; member of Board of Directors of
          Exelon since the merger closing, and Senior Director of William Blair
          & Co., L.L.C., investment banker. Authorized pursuant to Rule 70(b).

     4.   John W. Rogers: Member of Board of Directors of Unicom and ComEd from
          1999 through the merger closing; member of Board of Directors of
          Exelon since the merger closing, and member of Board of Directors of
          Bank One Corporation, commercial banking institution. Authorized
          pursuant to Rule 70(a).

     5.   John W. Rowe: Member of Board of Directors of Unicom and ComEd from
          1998 through the merger closing; member of Board of Directors of
          Exelon since the merger closing, and member of Board of Directors of
          Fleet Boston Financial, commercial banking institution. Authorized
          pursuant to Rule 70(b).


ITEM 6.   OFFICER AND DIRECTORS - PART III.

(a), (b) and (c) Directors' and Executive Officers' Compensation, Interests in
Securities Interests and Transactions with System Companies.




Information concerning compensation, interests in system securities, and
transactions with system companies is set forth in Exhibits A.1 and A.2 to this
Form U5S and is incorporated herein by reference.

(d)  Indebtedness of Directors or Executive Officers to System Companies.

None

(e)  Directors' and Executive Officers' Participation in Bonus and
     Profit-Sharing Arrangements and Other Benefits.

See Exhibit A.2 for descriptions of the participation of directors and executive
officers of System companies in bonus and profit-sharing arrangements and other
benefits.

(f)  Directors' and Executive Officers' rights to Indemnity.

The state laws under which each of the companies is incorporated provide broadly
for indemnification of directors and officers against claims and liabilities
against them in their capacities as such. Each of the companies' charters or
by-laws also provides for indemnification of directors and officers. In
addition, directors and executive offices of Exelon and all subsidiary companies
are insured under directors' and officers' liability policies.

ITEM 7.   CONTRIBUTIONS AND PUBLIC RELATIONS

Part I.   None
Part II.  None


ITEM 8.   SERVICE, SALES AND CONSTRUCTION CONTRACTS

Part I.   INTERCOMPANY SALES AND SERVICE

Exelon provided information on services, sales and construction contracts under
Form U-9C-3 filed confidentially on March 30, 2001, pursuant to Rule 104. In
addition, Exelon reports the following transactions:

Transaction       Serving Company       Receiving Company        Compensation
-----------       ---------------       -----------------        ------------
Fiber-optic       PECO                  Hyperion Telecomun-        $575,230
Equipment Lease                         ications

Communication     AT&T Wireless of      PECO                       $111,726
Services          Philadelphia, LLC

Other transactions may not have been reported, consistent with the terms of the
Merger U-1 order granting Exelon until December 31, 2001 to fully implement its
affiliate transaction procedures.


Part II.  The System companies had no contracts to purchase services or goods
          during 2000 from any affiliated (other than a System company) or from
          a company, in which any officer or director of the receiving company
          is a partner or owns 5 percent of more of any class of equity
          securities, except as reported in Item 6.




Part III. The System company does not employ any other person for the
          performance on a continuing basis of management, supervisory or
          financial advisory services.


ITEM 9.   WHOLESALE GENERATORS AND FOREIGN UTILITY COMPANIES

Part I

a.)       Sithe Energies, Inc.
          335 Madison Avenue, 28th Fl.
          New York, New York  10017

          Sithe Energies, Inc. (Sithe) is an independent power generator in
          North America utilizing primarily fossil and hydro generation. The
          purchase involves approximately 10,000 megawatts (MW) of generation
          consisting of 3,800 MW of existing merchant generation, 2,500 MW under
          construction, and another 3,700 MW of generation in various stages of
          development, as well as Sithe's domestic marketing and development
          businesses. The generation assets are located primarily in
          Massachusetts and New York.

          Exelon owns 49.9% of Sithe and holds the option to purchase the
          remaining 50.1% interest in Sithe between December 2002 and December
          2005 at a price based on prevailing market conditions.


          AmerGen Energy Company, L.L.C.
          200 Exelon Way,  Suite 345
          Kennett Square,  Pennsylvania  19348

          Exelon and British Energy, Inc., a wholly owned subsidiary of British
          Energy plc, formed AmerGen Energy Company, L.L.C. (AmerGen) to pursue
          opportunities to acquire and operate nuclear generating stations in
          the United States. Exelon owns a 50% equity interest in AmerGen.
          AmerGen owns and operates Clinton Nuclear Power Station, Three Mile
          Island Unit No. 1 Nuclear Generating Facility, and Oyster Creek
          Nuclear Generation Facility with an aggregate capacity of 2,378 MW.


b.)       At December 31, 2000, Exelon's aggregate capital investment in all
          EWGs and FUCOs was approximately $748.0 million. Information on the
          capital investment in each EWG and FUCO is filed herewith
          confidentially on Form SE.

          Exelon Generation and British Energy have each agreed to provide up to
          $100 million to AmerGen at any time for operating expenses. Exelon
          anticipates that Exelon Generation's capital expenditures will be
          funded by internally generated funds, Exelon Generation borrowings or
          capital contributions from Exelon. Exelon Generation's borrowings may
          be initially guaranteed by Exelon as a result of Exelon Generation's
          lack of separate operational history.



c.)       Exelon accounts for its investments in Sithe and AmerGen using the
          equity method of accounting whereby Sithe and AmerGen financial
          statements are not consolidated with the financial statements of
          Exelon.

          At December 31, 2000, the consolidated capitalization ratio of Exelon
          was: debt 66%, common equity 31%, and preferred securities of
          subsidiaries of 3%. (For these purposes, "consolidated debt" means all
          long-term debt, long-term debt due within one year, notes payable and
          other short-term obligations, including any short-term debt and
          non-recourse debt of EWG/FUCO Projects, to the extent normally
          consolidated under applicable financial reporting rules).

d.)       As permitted by the Merger U-1, AmerGen receives services from ComEd
          and PECO including engineering, regulatory support, systems
          integration, accounting and general services. These services are
          performed at cost, pursuant to the Affiliate Interests Agreement in
          the case of ComEd and pursuant to the Mutual Services Agreement in the
          case of PECO, and it is expected that each company will provide
          AmerGen with approximately $300,000 in services annually. In addition,
          Exelon Generation Company LLC will provide AmerGen with similar
          services valued at approximately $49,900,000, at cost, pursuant to a
          contract being drafted.

Part II

          An organization chart showing the relationship of each EWG to other
          system companies is included as Exhibit H. (previously filed on Form
          SE)


Part III

As determined pursuant to the December 8, 2000 Order, the Modified Rule 53 Test
applicable to Exelon's investments in EWGs and FUCOs issued in connection with
the Financing U-1, is $4,000.0 million. At December 31, 2000, Exelon's
"aggregate investment" (as defined in rule 53(a) under PUHCA) in all EWGs and
FUCOs was approximately $748.0 million, and accordingly, at December 31, 2000,
Exelon's remaining investment capacity under the Modified Rule 53 Test was
approximately $3,252.0 million.


ITEM 10.  FINANCIAL STATEMENTS AND EXHIBITS

FINANCIAL STATEMENTS

                              NOTES TO FINANCIAL STATEMENTS

Exelon                        Reference is made to "Notes to Consolidated
                              Financial Statements" contained in the Exelon 2000
                              Annual Report to Shareholders, which information
                              is incorporated by reference.

Previously filed confidentially on Form SE.

PEPCO

Filed confidentially herewith on Form SE.



EXHIBITS

The following exhibits are incorporated by reference to the indicated SEC file
number, unless an asterisk appears next to the exhibit reference. A single
asterisk indicates exhibits which were previously filed. A double asterisk
indicates exhibits which are filed herewith.

EXHIBIT
NUMBER                           DESCRIPTION

A.        ANNUAL REPORTS FILED UNDER THE SECURITIES AND EXCHANGE ACT OF 1934

          A.1   2000 Annual Report on Form 10-K for Exelon, ComEd and PECO, File
                Nos. 01-16169, 01-1839 and 01-01401, respectively.

          A.2   2000 Proxy Statement of Exelon Corporation. File No. 01-16169.

          A.3   Exelon Corporation Form 8-K filed March 16,2001 containing
                Exelon 2000 financial statements, footnotes and management's
                discussion and analysis.

B.        CHARTERS, ARTICLES OF INCORPORATION, TRUST AGREEMENTS, BY-LAWS, AND
          OTHER FUNDAMENTAL DOCUMENTS OF ORGANIZATION

          The articles and bylaws of Exelon, ComEd, PECO, PEPCO and SECO are
          incorporated by reference to the following:

Exelon 10-K
Exhibit No.         Description
-----------         -----------


3-1                 Articles of Incorporation of Exelon Corporation
                    (Registration Statement No. 333-37082, Form S-4, Exhibit
                    3-1).

3-2                 Bylaws of Exelon Corporation (Registration Statement No.
                    333-37082, Form S-4, Exhibit 3-2).

3-3                 Amended and Restated Articles of Incorporation of PECO
                    Energy Company.

3-4                 Bylaws of PECO Energy Company, adopted February 26, 1990 and
                    amended January 26, 1998 (File No. 1-01401, 1997 Form 10-K,
                    Exhibit 3-2).

3-5                 Restated Articles of Incorporation of Commonwealth Edison
                    Company effective February 20, 1985, including Statements of
                    Resolution Establishing Series, relating to the
                    establishment of three new series of Commonwealth Edison
                    Company preference stock known as the "$9.00 Cumulative
                    Preference Stock," the "$6.875 Cumulative Preference Stock"
                    and the "$2.425 Cumulative Preference Stock" (File No.
                    1-1839, 1994 Form 10-K, Exhibit 3-2).

3-6                 Bylaws of Commonwealth Edison Company, effective September
                    2, 1998, as amended through October 20, 2000.




3-7                 PECO Energy Power Company's Certificate of Organization and
                    Charter, By-laws amended as of December 23, 1993, and
                    amendment to Articles of Incorporation filed February 8,
                    1994, are incorporated herein by reference (1991 Form U5S
                    and 1993 Form 10-K, File No. 1-1392).

3-8                 Susquehanna Power Company's Certificate of Organization is
                    incorporated herein by reference (1991 Form U5S, File No.
                    1-1392); By-laws amended December 23, 1993, and Charter
                    amendment filed February 8, 1994 are incorporated herein by
                    reference (1993 Form U5S, File No. 1-1392).


C.        The indentures or other fundamental documents defining the rights of
          holders of funded debt listed below are incorporated by reference:

Exelon 10-K
Exhibit No.         Description
-----------         -----------

4-3                 First and Refunding Mortgage dated May 1, 1923 between The
                    Counties Gas and Electric Company (predecessor to PECO
                    Energy Company) and Fidelity Trust Company, Trustee (First
                    Union National Bank, successor), (Registration No. 2-2281,
                    Exhibit B-1).

4-3-1               Supplemental Indentures to PECO Energy Company's First and
                    Refunding Mortgage:


                    Dated as of File              Reference                             Exhibit No.
                    ----------------              ---------                             -----------
                                                                                
                    May 1, 1927                   2-2881                                B-1(c)
                    March 1, 1937                 2-2881                                B-1(g)
                    December 1, 1941              2-4863                                B-1(h)
                    November 1, 1944              2-5472                                B-1(i)
                    December 1, 1946              2-6821                                7-1(j)
                    September 1, 1957             2-13562                               2(b)-17
                    May 1, 1958                   2-14020                               2(b)-18
                    March 1, 1968                 2-34051                               2(b)-24
                    March 1, 1981                 2-72802                               4-46
                    March 1, 1981                 2-72802                               4-47
                    December 1, 1984              1-01401, 1984 Form 10-K               4-2(b)
                    April 1, 1991                 1-01401, 1991 Form 10-K               4(e)-76
                    December 1, 1991              1-01401, 1991 Form 10-K               4(e)-77
                    April 1, 1992                 1-01401, March 31, 1992               4(e)-79
                                                  Form 10-Q
                    June 1, 1992                  1-01401, June 30, 1992                4(e)-81
                                                  Form 10-Q
                    July 15, 1992                 1-01401, June 30, 1992                4(e)-83
                                                  Form 10-Q
                    September 1, 1992             1-01401, 1992 Form 10-K               4(e)-85
                    March 1, 1993                 1-01401, 1992 Form 10-K               4(e)-86
                    May 1, 1993                   1-01401, March 31, 1993               4(e)-88
                                                  Form 10-Q
                    May 1, 1993                   1-01401, March 31, 1993               4(e)-89
                                                  Form 10-Q
                    August 15, 1993               1-01401, Form 8-A dated               4(e)-92
                                                  August 19, 1993
                    November 1, 1993              1-01401, Form 8-A dated               4(e)-95
                                                  October 27, 1993
                    May 1, 1995                   1-01401, Form 8-K dated               4(e)-96
                                                  May 24, 1995




4-4                 Mortgage of Commonwealth Edison Company to Illinois
                    Merchants Trust Company, Trustee (Harris Trust and Savings
                    Bank, as current successor Trustee), dated July 1, 1923,
                    Supplemental Indenture thereto dated August 1, 1944, and
                    amendments and supplements thereto dated, respectively,
                    August 1, 1946, April 1, 1953, March 31, 1967, April 1,1967,
                    July 1, 1968, October 1, 1968, February 28, 1969, May 29,
                    1970, June 1, 1971, May 31, 1972, June 15, 1973, May 31,
                    1974, June 13, 1975, May 28, 1976, and June 3, 1977. (File
                    No. 2-60201, Form S-7, Exhibit 2-1).

4-5-1               Supplemental Indentures to aforementioned Commonwealth
                    Edison Mortgage.



                    Dated as of File              Reference                             Exhibit No.
                    ----------------              ---------                             -----------
                                                                            
                    May 17, 1978                  2-99665, Form S-3                     4-3
                    August 31, 1978               2-99665, Form S-3                     4-3
                    June 18, 1979                 2-99665, Form S-3                     4-3
                    June 20, 1980                 2-99665, Form S-3                     4-3
                    April 16, 1981                2-99665, Form S-3                     4-3
                    April 30, 1982                2-99665, Form S-3                     4-3
                    April 15, 1983                2-99665, Form S-3                     4-3
                    April 13, 1984                2-99665, Form S-3                     4-3
                    April 15, 1985                2-99665, Form S-3                     4-3
                    April 15, 1986                33-6879, Form S-3                     4-9
                    June 15, 1990                 33-38232, Form S-3                    4-12
                    June 1, 1991                  33-40018, Form S-3                    4-12
                    October 1, 1991               33-40018, Form S-3                    4-13
                    October 15, 1991              33-40018, Form S-3                    4-14
                    February 1, 1992              1-1839, 1991 Form 10-K                4-18
                    May 15, 1992                  33-48542, Form S-3                    4-14
                    July 15, 1992                 33-53766, Form S-3                    4-13
                    September 15, 1992            33-53766, Form S-3                    4-14
                    February 1, 1993              1-1839, 1992 Form 10-K                4-14
                    April 1, 1993                 33-64028, Form S-3                    4-12
                    April 15, 1993                33-64028, Form S-3                    4-13
                    June 15, 1993                 1-1839, Form 8-K dated                4-1
                                                  May 21, 1993
                    July 1, 1993                  1-1839, Form 8-K dated                4-2
                                                  May 21, 1993
                    July 15, 1993                 1-1839, Form 10-Q for                 4-1
                                                  quarter ended June
                                                  30, 1993.
                    January 15, 1994              1-1839, 1993 Form 10-K                4-15
                    December 1, 1994              1-1839, 1994 Form 10-K                4-16
                    June 1, 1996                  1-1839, 1996 Form 10-K                4-16



4-5-2               Instrument of Resignation, Appointment and Acceptance dated
                    January 31, 1996, under the provisions of the Mortgage dated
                    July 1, 1923, and Indentures Supplemental thereto (File No.
                    1-1839, 1995 Form 10-K, Exhibit 4-28).




4-5-3               Instrument dated as of January 31, 1996, for trustee under
                    the Mortgage dated July 1, 1923 and Indentures Supplemental
                    thereto (File No. 1-1839, 1995 Form 10-K, Exhibit 4-29).

4-6                 Indentures of Commonwealth Edison Company to The First
                    National Bank of Chicago, Trustee (Amalgamated Bank of
                    Chicago, as current successor Trustee), dated April 1, 1949,
                    October 1, 1949, October 1, 1950, October 1, 1954, January
                    1, 1958, January 1, 1959 and December 1, 1961 (File No.
                    1-1839, 1982 Form 10-K, Exhibit 4-20).

4-7                 Indenture dated as of September 1, 1987 between Commonwealth
                    Edison Company and Citibank, N.A., Trustee relating to Notes
                    (File No. 1-1839, Form S-3, Exhibit 4-13).

4-7-1               Supplemental Indenture to Indenture dated September 1, 1987
                    dated July 14, 1989 (File No. 33-32929, Form S-3, Exhibit
                    4-16).

4-7-2               Supplemental Indenture to Indenture dated September 1, 1987,
                    dated January 1, 1997 (File No. 1-1839, 1999 Form 10K,
                    Exhibit 4-21).

4-7-3               Supplemental Indenture to Indenture dated September 20,
                    1987, dated September 1, 2000.

D.        TAX ALLOCATION AGREEMENT PURSUANT TO RULE 45(c)




**  Exhibit D.

                              TAX SHARING AGREEMENT



         THIS  AGREEMENT,  dated  as of the 1st  day of  January,  2001,  by and
between Exelon Corporation, a Pennsylvania corporation ("Parent"), Exelon Energy
Delivery  Company,  LLC, a Delaware limited liability  company,  Exelon Ventures
Company LLC, a Delaware limited liability company,  Unicom Investment,  Inc., an
Illinois  corporation,  and Exelon  Business  Services  Company,  a Pennsylvania
corporation (each a "Subsidiary" and together,  the  "Subsidiaries") and each of
PECO Energy Company,  Commonwealth  Edison Company,  Exelon Generation  Company,
LLC,  Exelon  Enterprises  Company,  LLC and the companies  listed on Schedule A
attached hereto (each a "Participant" and together, the "Participants").

                               W I T N E S S E T H

         WHEREAS, Parent is the common parent corporation of an affiliated group
of corporations  within the meaning of Section  1504(a) of the Internal  Revenue
Code of 1986, as amended (the "Code");

         Whereas, the Subsidiaries and the Participants are each members of that
affiliated  group or otherwise have taxable income included  directly on the tax
return of a member of the group (i.e.  such Subsidiary or Participant is treated
as a disregarded entity for tax purposes);

         WHEREAS,  the  members  of the  affiliated  group  anticipate  filing a
consolidated  federal  income tax return and combined,  consolidated  or unitary
state income tax returns  where  required or where  elections to so file have or
will be made;

         WHEREAS,  Parent,  the Subsidiaries and the Participants  wish to agree
upon a fair and  equitable  method  for  determining  the  share of the  group's
consolidated  federal income tax burdens and benefits  properly  attributable to
each Subsidiary and its subsidiaries;

         WHEREAS,  Parent,  the Subsidiaries and the Participants  wish to agree
upon a fair and equitable method for determining the share of any state taxes to
be borne by any members of the Parent  Group who file state and local income tax
returns (or other state returns) on a combined, unitary, consolidated or similar
basis;

         WHEREAS,  the  Subsidiaries and the Participants may benefit on account
of the tax attributes of other members of the Parent  affiliated group, and such
other members may benefit on account of the tax  attributes of the  Subsidiaries
or the  Participants,  as a result of the filing of consolidated  federal income
tax returns or any combined, consolidated, unitary or similar state tax returns;

         WHEREAS,  Parent,  the  Subsidiaries  and the  Participants  desire  to
provide for payments by Parent and  Subsidiaries  to the other  Subsidiaries  as
reimbursement for the utilization of such tax benefits; and







         WHEREAS,  Parent,  the  Subsidiaries  and the  Participants  desire  to
provide a mechanism  for making  further  payments  for the  utilization  of tax
benefits  that  fairly  reflect  any  subsequent  adjustments  to  prior  years'
consolidated federal income tax returns or any combined,  consolidated,  unitary
or similar state tax return , whether those  adjustments are made while any such
Subsidiary  remains a member of the affiliated group (or similar state group) of
corporations  of which Parent (or any Subsidiary or  Participant)  is the common
parent  or are made  after  any such  Subsidiary  ceases  to be a member of that
group.

         NOW,  THEREFORE,  in consideration of the premises and of the covenants
and  agreements  set forth below,  the parties,  intending to be legally  bound,
agree as follows:

Section One:  Definitions

         For  purposes of this  Agreement,  the terms set forth below shall have
the following meanings:

         (a)  Parent  Group:  All  corporations  (whether  or not  presently  in
existence)  included,  from time to time, in the consolidated federal income tax
return filed by Parent.

         (b) Subsidiary  Group:  Each Subsidiary of Parent and all  corporations
(whether or not presently in existence)  that, at the pertinent  time,  would be
entitled or required to join with such Subsidiary in filing consolidated federal
income tax returns if such Subsidiary were a common parent  corporation and were
not a  member  of the  Parent  Group.  For  purposes  of  this  Agreement,  each
first-tier Subsidiary of Parent (and its includible  subsidiaries) will comprise
a separate  Subsidiary  Group.  Those  corporations  presently  included  in any
Subsidiary Group are listed on Schedule 1, attached to this Agreement.

         (c)  Truncated  Group:  All  corporations  included in the Parent Group
except for the particular  Subsidiary  Group for which a determination  is being
made as to the  amount of tax  benefits  and  burdens  to be  allocated  to such
Subsidiary Group.

         (d) Parent Group Tax  Liability:  The  consolidated  federal income tax
liability  of the Parent  Group for any taxable  year for which the Parent Group
files a consolidated federal income tax return.

         (e) Subsidiary  Group Tax  Liability:  The federal income tax liability
determined  at the end of the taxable year,  of a particular  Subsidiary  Group,
computed as if the Subsidiary Group was not part of the Parent Group, but rather
a separate affiliated group of corporations filing a consolidated federal income
tax return pursuant to Section 1502 of the Code, except as otherwise provided in
Section 2(a) of this Agreement.

         (f) Truncated  Group Tax  Liability:  The federal  income tax liability
determined at the end of the taxable  year, of the Parent Group,  computed as if
the particular Subsidiary Group was not part of the Parent Group.

         (g) Member: The Parent and each of the Subsidiaries.



                                       2


         (h) Estimated  Subsidiary  Group Tax  Liability:  The estimated year to
date Subsidiary Group Tax Liability as of the due date for payments of estimated
tax under  Section  6655 of the Code (or any  applicable  state  tax  provision)
calculated consistently with the provisions of Section 2 of this Agreement.

         (i) Estimated  Subsidiary Group Tax Payment: The net difference between
(i) the  Estimated  Subsidiary  Group Tax  Liability  and (ii) the net amount of
payments made to or by a Subsidiary Group with respect to estimated taxes during
the applicable taxable year.

         (j) Parent Tax Benefit:  The amount by which the difference between the
aggregate amounts payable by the Subsidiaries to Parent pursuant to Section 3(b)
exceeds  the  sum  of  (i)  the  aggregate  amounts  payable  by  Parent  to all
Subsidiaries pursuant to Section 3(c) and (ii) the Parent Group Tax Liability.

         (k)  Parent  State Tax  Benefit:  The  amount  by which the  difference
between the aggregate  amounts payable by the Subsidiaries to Parent pursuant to
this  Agreement for any state and local tax  obligations  exceeds the sum of (i)
the aggregate  amounts  payable by Parent to all  Subsidiaries  pursuant to this
Agreement  for  state  and local tax  obligations  and (ii) the  Parent  Group's
aggregate state and local tax liability.

Section Two:  Calculation of Subsidiary Group and Truncated Group Tax Liability

         (a)  Subsidiary  Group Tax  Liability:  The annual  computation  of any
Subsidiary  Group  Tax  Liability  shall  be  determined  for  purposes  of this
Agreement in accordance with the following principles:

                           1. The income, deductions,  credits,  carryovers, and
         other tax  attributes  of the  Subsidiary  Group shall be determined in
         accordance  with  all  elections  actually  made  (or  deemed  made  by
         operation of law) by each member of the  Subsidiary  Group for purposes
         of computing the Parent Group Tax Liability.

                           2.  If any  transaction  between  any  member  of the
         Subsidiary  Group and any member of the Truncated Group  constitutes an
         intercompany  transaction (as that term is defined in Section 1.1502-13
         of the Treasury  Regulations) between members of the Parent Group, then
         that  member  of the  Subsidiary  Group  (or any  other  member  of the
         Subsidiary Group that inherits any portion of the deferred gain or loss
         of that  corporation  pursuant  to Section  1.1502-13(c)(1)  or Section
         1.1502-13(c)(6)  of the Treasury  Regulations)  shall take into account
         the tax attributes  associated  with the transaction at the time and in
         the manner it takes those tax  attributes  into account for purposes of
         the Parent Group's consolidated tax return.

                           3.  Any  carryover  ordinary  or  capital  losses  or
         credits of the Subsidiary Group shall be taken into  consideration when
         computing the Subsidiary  Group Tax Liability unless (i) such carryover
         losses or credits  were  absorbed  in  computing  the Parent  Group Tax


                                       3


         Liability  for any or all  previous  tax  years  and  (ii)  the  Parent
         compensated such Subsidiary Group for the use of such losses or credits
         in  accordance  with the  principles  set  forth in  Section  3 of this
         Agreement.

                           4.  The  Subsidiary  Group  Tax  Liability  shall  be
         computed on a basis consistent with the calculation of the Parent Group
         Tax Liability (i.e., if the Parent Group Tax Liability does not reflect
         a liability for the Alternative Minimum Tax, the Subsidiary Group shall
         compute its tax liability  without  regard to the  Alternative  Minimum
         Tax; similarly,  if the Parent Group Tax Liability reflects a liability
         for the Alternative Minimum Tax, the Subsidiary Group shall compute its
         tax liability with regard to the Alternative Minimum Tax).

                           5. In the event that more than one  Subsidiary  Group
         generates  losses or credits in any tax year and the Parent  Group does
         not  utilize the  aggregate  amount of such losses or credits to reduce
         the Parent Group Tax Liability,  such unutilized losses or credits will
         be allocated to those companies contributing to the aggregate losses or
         credits on a proportionate basis.

         (b)  Truncated  Group Tax  Liability:  The  annual  computation  of the
Truncated Group Tax Liability shall be determined for purposes of this Agreement
in accordance with the following principles:

                           1. The income, deductions,  credits,  carryovers, and
         other tax  attributes  of the  Truncated  Group shall be  determined in
         accordance  with  all  elections  actually  made  (or  deemed  made  by
         operation of law) by each member of the Truncated Group for purposes of
         computing the Parent Group Tax Liability.

                           2.  If any  transaction  between  any  member  of the
         Subsidiary  Group and any member of the Truncated Group  constitutes an
         intercompany  transaction (as that term is defined in Section 1.1502-13
         of the Treasury  Regulations) between members of the Parent Group, then
         that  member  of the  Truncated  Group  (or  any  other  member  of the
         Truncated  Group that inherits any portion of the deferred gain or loss
         of that  corporation  pursuant  to Section  1.1502-13(c)(1)  or Section
         1.1502-13(c)(6)  of the Treasury  Regulations)  shall take into account
         the tax attributes  associated  with the transaction at the time and in
         the manner it takes those tax  attributes  into account for purposes of
         the Parent Group's consolidated tax return.

                           3.  Any  carryover  ordinary  or  capital  losses  or
         credits  of a  member  of the  Truncated  Group  shall  be  taken  into
         consideration  when computing the Truncated Group Tax Liability  unless
         (i) such  carryover  losses or credits were  absorbed in computing  the
         Parent Group Tax  Liability  for any or all previous tax years and (ii)
         the Parent  compensated  such member of the Truncated Group for the use
         of such losses or credits in accordance  with the  principles set forth
         in Section 3 of this Agreement.

                           4.  The  Truncated   Group  Tax  Liability  shall  be
         computed on a basis consistent with the calculation of the Parent Group
         Tax Liability (i.e., if the Parent Group Tax Liability does not reflect
         a liability for the Alternative  Minimum Tax, the Truncated Group shall
         compute its tax liability  without  regard to the  Alternative  Minimum
         Tax).


                                       4


                           5. In the event that more than one  Subsidiary  Group
         generates  losses or credits in any tax year and the Parent  Group does
         not  utilize the  aggregate  amount of such losses or credits to reduce
         the Parent Group Tax Liability,  such unutilized losses or credits will
         be allocated to those companies contributing to the aggregate losses or
         credits on a  proportionate  basis and for  purposes of  computing  the
         Truncated Group Tax Liability, the proportionate share of such credits,
         unutilized  losses or any unabsorbed  losses shall be added back to the
         Truncated   Group's  taxable  income  for  purposes  of  computing  the
         Truncated Group Tax Liability.

Section Three: Payments With Respect to Tax Benefits and Burdens

                  (a) If a  consolidated  federal  income tax return is filed by
the Parent Group for a taxable  year,  and if that return  evidences a liability
for federal  income  taxes for such year,  the total  liability as shown on such
return shall be payable in full by Parent.

                  (b) For any taxable year during which income,  loss, or credit
against  federal  income  tax  of any  Subsidiary  or any  other  member  of any
Subsidiary Group is includible in computing the Parent Group Tax Liability, such
Subsidiary  shall pay to Parent an  amount  equal to such  Subsidiary  Group Tax
Liability,  if any. This amount shall be paid before  thirty days  following the
earlier of (i) the date on which the Parent Group's  consolidated federal income
tax return is filed or (ii) the date,  following the close of such taxable year,
on which Parent  notifies a Subsidiary of Parent's  final  determination  of the
Subsidiary Group Tax Liability.

                  (c) For any taxable year during which income,  loss, or credit
against  federal  income tax of  Subsidiary  or any other member of a Subsidiary
Group is includible in computing  the Parent Group Tax  Liability,  Parent shall
pay to such  Subsidiary an amount equal to the excess,  if any, of the Truncated
Group Tax Liability for the taxable year over the Parent Group Tax Liability for
the taxable year. This payment shall be made within thirty days after the Parent
Group's  consolidated  return  for a taxable  year is filed.  In the event  that
multiple  Subsidiary  Groups losses are includible in computing the Parent Group
Tax Liability, such payment shall be made to each individual Subsidiary Group on
a proportionate basis.

                  (d) Parent Tax Benefit: Notwithstanding any other provision of
this  Agreement,  to the extent  that there is a Parent Tax  Benefit  the Parent
shall pay the amount of such Parent Tax Benefit to those  Subsidiary  Groups who
have Subsidiary Group Tax Liabilities. Any such payment to the Subsidiary Groups
shall be allocated  among the separate  Subsidiary  Groups in  proportion to the
amount of the Subsidiary Groups separate Subsidiary Group Tax Liabilities.

                  (e)  Estimated   Tax  Payments:   For  purposes  of  computing
estimated tax payments,  the  provisions set forth in Section 2 shall be applied
on each due date for  payments of any  estimated  tax under  Section 6655 of the
Code (or any  applicable  state or local tax provision) to compute the Estimated
Subsidiary  Group Tax Liability and the Estimated  Subsidiary  Group Tax Payment
for each Subsidiary Group. If the Estimated Subsidiary Group Tax Payment results
in a payment  due to the  Parent,  (i.e.,  the  Estimated  Subsidiary  Group Tax
Liability  exceeds  the net  amount of  payments  previously  made by or to such
Subsidiary  Group),  such Subsidiary Group shall remit such amount to the Parent
within  fifteen days of the due date for payments of estimated tax under Section
6655 of the  Code (or any  applicable  state or  local  tax  provision).  If the
Estimated  Subsidiary Group Tax Payment results in a payment due to a Subsidiary
Group (i.e.,  the Estimated  Subsidiary Group Tax Liability is less than the net
amount of payments previously made by or to such Subsidiary Group), Parent shall


                                       5


remit such payment to such  Subsidiary  Group within  fifteen days after the due
date for  payments  of  estimated  tax  under  Section  6655 of the Code (or any
applicable state tax provision). Any estimated tax payments made by a Subsidiary
to Parent  under  this  Section  3(d) for any  taxable  year shall be applied to
reduce the amount, if any, owing by such Subsidiary to Parent under Section 3(b)
for that  year.  If the sum of the  payments  made by a  Subsidiary  under  this
Section 3(d) for any taxable year exceeds the amount owing by such Subsidiary to
Parent under Section 3(b) for that taxable  year,  Parent shall repay the excess
to Subsidiary within thirty days after the Parent Group's  consolidated  federal
income return for that year is filed. The same rules shall apply with respect to
estimated  tax  payments  for state and local  income taxes for which the Parent
Group or any member of the Parent  Group files income tax returns on a combined,
unitary,  consolidated  or similar basis,  taking into account the provisions of
Section 10 of this Agreement with respect to  determining  any Subsidiary  Group
State Tax Liability for the applicable period.

Section Four:  Carrybacks

                  (a) In the event that the Parent Group  incurs a  consolidated
net  operating  loss (as that term is  defined in  Section  1.1502-21(f)  of the
Treasury  Regulations)  or a credit  against  federal income tax for any taxable
year and that  consolidated  net operating loss or tax credit is carried back to
and  absorbed  in a prior  taxable  year of Parent or any  member of the  Parent
Group,  then the  Parent  Group  Tax  Liability,  the  Subsidiary  Group(s)  Tax
Liability,  and the  Truncated  Group Tax  Liability  for the prior taxable year
shall be recomputed  accordingly,  and the amount of the liabilities  determined
under  Section  2 of this  Agreement  shall  be  adjusted  to  conform  to those
recomputations.

                  (b)  Parent  shall  be   responsible   for  carrying  out  any
recomputations  required by Section 4(a) and shall promptly send each Subsidiary
notification of any conforming  adjustment of affected liabilities under Section
Two of this Agreement. Within 10 days following the mailing of that notice, each
Subsidiary shall pay Parent or Parent shall pay such Subsidiary, as the case may
be, the amount of any  payment  due in  accordance  with  Section  Three of this
Agreement  resulting  from any  recomputations  done in accordance  with Section
4(a), as reflected in the notice.

                  (c) This Agreement  shall have no application to the carryback
of a net  operating  loss or credit  from a separate  return  year  (within  the
meaning of Section  1.1502-1(e) of the Treasury  Regulations) of a Subsidiary or
another  affiliated group of which a Subsidiary is a member, as the case may be,
to any taxable year of the Parent Group.




                                       6




Section Five: Adjustments

         (a) Adjustments To Tax Liability For Tax Years Ending Before

                  Effective  Date:  If a taxing  authority  adjusts the state or
federal tax of any member of the Parent  Group for a tax period that ended prior
to the effective date of this Agreement,  such adjustment  shall be allocated in
the following manner:

                           1. The Vice  President of Taxes of Parent shall first
         determine whether such adjustment relates to either (i) a member of the
         former  affiliated  group of corporations for which PECO was the common
         parent  (the "PECO  Group")  or (ii) a member of the former  affiliated
         group of  corporations  for which  Unicom  was the common  parent  (the
         "Unicom Group").

                           2.  If the  adjustment  relates  to a  member  of the
         Unicom Group, such adjustment shall be allocated in accordance with any
         tax sharing  agreement  among the members of the Unicom Group effective
         for the taxable year of the adjustment.

                           3. If the audit adjustment relates to a member of the
         former PECO Group, such adjustment shall be borne by PECO to the extent
         provided  in any  document  referred  to in  Section  5(a)(5)  of  this
         Agreement  and,  notwithstanding  any other  provision of this document
         with the  exception of Section  5(a)(5),  shall not be allocated to any
         current or former member of the PECO group.

                           4. Provided further however,  that the Vice President
         of Taxes of Parent shall be responsible  for determining the line(s) of
         business any such adjustment  relates to. If the adjustment is directly
         related to a line of business not currently conducted by the entity for
         which  such tax would be  allocated  under  Section  5(a)(2) or 5(a)(3)
         above (i.e. the  generation  business),  then the  adjustment  shall be
         allocated (except as provided in Section 5 (a)(3) of this Agreement) to
         the entity currently  conducting such line of business and such line of
         business  shall be  responsible  for  paying the tax due as a result of
         such increase in state or federal tax liability.

                           5. Provided further however, if any provision of this
         Agreement  is  contrary  to a  provision  (a) in  any of the  following
         documents:  (i) Plan of Division dividing PECO Energy Company into PECO
         Energy Company and Exelon Business  Services  Company;  (ii) Assignment
         and Assumption  Agreement by and between PECO Energy Company and Exelon
         Generation  Company,  LLC dated January 1, 2001;  (iii)  Assignment and
         Assumption  Agreement  by and between  PECO  Energy  Company and Exelon
         Enterprises Company, LLC dated January 1, 2001; and (iv) Assignment and
         Assumption  Agreement  by and between  PECO  Energy  Company and Exelon
         Business  Services  Company dated January 1, 2001 and (v)  Contribution
         Agreement  between  Commonwealth  Edison  Company and ComEd  Generation


                                       7


         Company  LLC dated  January  1, 2001  (collectively  the  "Contribution
         Agreements"),  or (b) of  Section  13(c)  of this  Agreement,  then the
         provisions in the respective Contribution Agreement or of Section 13(c)
         shall control,  respectively. In the event the provisions of any of the
         Contribution  Agreements conflicts with any provision of Section 13(c),
         the provisions of Section 13(c) shall control.

         (a) Changes to Tax Liability for Prior Tax Years After  Effective Date:
If the Parent Group Tax  Liability  for a taxable year is changed for any reason
other than the carryback of a net operating loss or credit governed by Section 4
of this  Agreement  (including,  but not  limited  to,  the filing of an amended
return, a claim for refund,  or an examination by the Internal Revenue Service),
and the  allocation  of such  adjustment  is not governed by the  provisions  of
Section 5(a), then the Subsidiary Group(s) Tax Liability and the Truncated Group
Tax Liability for such taxable year shall be recomputed accordingly to the terms
of this Agreement,  and the amount of the liabilities determined under Section 2
of this Agreement shall be adjusted to conform to those recomputations.

         (b) Whenever any payment is due on account of a recomputation  pursuant
to Section  5(b),  an  additional  liability  (referred to in this  Agreement as
"Associated  Interest")  shall be  determined  to reflect the  interest  cost or
benefit  associated  with  that  recomputation  and  consequent   adjustment  to
liabilities  under Section Two of this  Agreement.  The liability for Associated
Interest  shall be computed by applying the  applicable  rates of interest under
the rules  prescribed  by the Code and Treasury  Regulations  for the periods in
question to the adjusted  liabilities  under Section Two of the  Agreement.  The
applicable rates of interest shall be determined as follows:

                           1. In the case of an  increase in an amount due under
         Section  3(b) or a decrease in an amount due under  Section  3(c),  the
         applicable  rate  shall  be:  (i) the rate (or  rates)  charged  by the
         Internal  Revenue Service with respect to  underpayments of income tax,
         to the extent that the  recomputation  of the  Subsidiary  Group(s) Tax
         Liability  for the taxable year of the  adjustment  served to create or
         increase an actual  Parent Group Tax  Liability  for the taxable  year;
         provided  however  that such rate shall not be the "large  corporation"
         underpayment  rate unless the Parent Group is subject to such rate, and
         (ii) the rate paid by the Internal  Revenue  Service on overpayments of
         income  tax,  to the extent that the  recomputation  of the  Subsidiary
         Group Tax  Liability  served to reduce or  eliminate  a refund that the
         Parent  Group would have been  entitled to receive if the Parent  Group
         had consisted only of the members of the Truncated Group in the taxable
         year for which the adjustment is made.

                           2. In the case of a  decrease  in an amount due under
         Section 3(b) or an increase in an amount due under  Section  3(c),  the
         applicable  rate  shall  be the rate (or  rates)  paid by the  Internal
         Revenue Service with respect to overpayments of income tax.

         (c) Parent shall be  responsible  for  carrying out any  recomputations
required by Section 5(b) of this Agreement and for the computation of Associated
Interest required by Section 5(c) of this Agreement and shall promptly send each
Subsidiary written notification of both. Within 10 days following the receipt of
that notice,  Subsidiary shall pay Parent or Parent shall pay Subsidiary, as the
case may be,  the amount of any  increased  liabilities  under  Section 2 of the
Agreement  and any  Associated  Interest  computed  under  Section  5(c) of this
Agreement, as reflected in the notice.


                                       8


         (d) The provisions of this Section 5, together with those provisions of
Section 3 that may be  invoked  under  this  Section 5 from time to time,  shall
remain in  effect  notwithstanding  that a  Subsidiary  may have  ceased to be a
member of the  affiliated  group of  corporations  of which Parent is the common
parent.

Section Six:  Interest

                  If any payment required to be made pursuant to Section 3, 4 or
5 of this  Agreement  is not made  within the time  periods  specified  in those
Sections, the delinquent payment shall bear interest from its due date until the
date of actual  payment at the rate (or rates)  charged by the Internal  Revenue
Service on underpayments of tax for the periods in question.

Section Seven:  Tax Sharing Agreement Among Members of a Subsidiary Group

                  (a) Upon completion of (i) the calculation of the Parent Group
Tax Liability,  each Subsidiary  Group Tax Liability and the Truncated Group Tax
Liability  and  (ii)  the  payments  between  the  Parent  and any or all of the
Subsidiaries  in accordance  with the  provisions of Section 3, each  Subsidiary
Group shall then repeat the  procedures  set forth in Section 2 for the purposes
of determining  the amount of tax benefits and burdens to be allocated among the
individual members of a particular  Subsidiary Group. Payments among the members
of the Subsidiary Group shall be in accordance with the provisions in Section 3.
For  purposes of this  computation,  each  Subsidiary  shall be deemed to be the
parent of its respective  affiliated  group and each second tier  subsidiary and
its subsidiaries  shall comprise a separate  Subsidiary  Group.  Each Subsidiary
Group shall  repeat this  process  until  there are no  additional  corporations
within the Subsidiary Group which could comprise an affiliated  group.  Provided
however,  that no  allocations  of tax benefits and burdens among members of any
Subsidiary Group  (including any second-tier or lower Subsidiary  Group) need be
made in accordance  with this Section 7 if such  Subsidiary  Group enters into a
separate tax allocation  agreement  among all of the members of such  Subsidiary
Group which is in compliance with the Public Utility Holding Company Act of 1935
("PUHCA").  Unless  expressly  provided in this  Section  7(a),  for purposes of
allocating  the  amount of tax  benefits  and  burdens  among the  members  of a
particular  Subsidiary Group, all provisions of this tax sharing agreement shall
be applicable.

                  (b) Solely for  purposes  of  computing  their  portion of the
Parent Group Tax Liability in accordance  with this Section 7 of the  Agreement,
Exelon Energy Delivery,  Exelon Generation  Company LLC, and Exelon  Enterprises
Company and any other  entity  which is treated as a  disregarded  entity  under
Treasury Regulation Section 301.7701-3,  shall be treated as if they had made an
election to be taxed as a corporation  pursuant to Treasury  Regulation  Section
301.7701-2(b)  and  shall be  considered  a  Participant  for  purposes  of this
Agreement.  In  addition,  all entities  properly  treated as  corporations  for
purposes of Section  7701(a)(3) of the Code shall be treated as corporations for
purposes of this Agreement.




                                       9



Section Eight:  Responsibility for Tax Calculations and Disputes

                  The  tax  department  of  Parent  shall  be  responsible   for
preparing all calculations required under this Agreement.  The Vice President of
Taxes  and  General  Tax  Officer  of  Exelon  shall  review  and  approve  each
calculation  prepared  by the tax  department,  and  shall  be  responsible  for
resolving any disputes regarding such calculations.

                  All disputes regarding application of the procedures set forth
in this  Agreement  shall be resolved by the Vice President of Taxes and General
Tax Officer of Parent in conjunction with such other members of Parent as he (or
she) shall deem necessary or appropriate.

Section Nine:  Effective Date

                  This  Agreement  shall be effective  for taxable  years of the
Parent Group beginning after 2000.

Section Ten:  State Taxes

                  State and local  income taxes (and other taxes) shall be borne
by the entity  (including  entities that are "disregarded  entities" for federal
income tax purposes or to the entity that is currently  conducting  such line of
business)  that incurs such taxes.  For those state and local  jurisdictions  in
which the  Parent  Group or any  member of the  Parent  Group  files  income tax
returns on a combined,  unitary,  consolidated  or similar basis,  (a) the total
liability shown on such return shall be paid in full by Parent or such member of
the Parent Group and (b) each member of the Parent Group with nexus in the state
shall pay the Parent or member of the Parent  Group filing such return an amount
equal to the tax which  such  Subsidiary  Group  would  have  incurred  had such
Subsidiary  Group not been a member of the  combined,  unitary  or  consolidated
group filing such return ("Subsidiary Group State Tax Liability").  In the event
that there is a Parent State Tax Benefit with respect to any such state tax, the
Parent shall pay the amount of such Parent State Tax Benefit to those Subsidiary
Groups who have a Subsidiary Group State Tax Liability.  Any such payment of the
Parent State Tax Benefit to the Subsidiary  Groups shall be allocated  among the
separate  Subsidiary Groups in proportion to the amount of the Subsidiary Groups
separate Subsidiary Group State Tax Liabilities.

Section Eleven:  Penalties & Interest

         (a) Any Penalties  incurred by the Parent Group  relating to filing its
consolidated  return  shall be  specifically  assigned to the  member(s)  of the
Parent  Group to whom such  penalty is directly  attributable  (and shall become
part of the  Subsidiary  Group Tax  Liability  for any  Subsidiary  Group  which
includes  that  member(s)),  provided  however,  that  penalties  shall  not  be
specifically  assigned  to any  particular  member  or  Subsidiary  Group if the
imposition of such penalty is not directly  attributable to the acts, errors, or
omissions of the member.  Penalties not  specifically  assigned  pursuant to the
previous  sentence  shall be allocated  among the Members on a pro rata basis in
accordance with their separate tax liabilities.  For this purpose,  the Parent's
separate tax liability shall be equal to the difference between the Parent Group
Tax Liability and the aggregate of all Subsidiary Group Tax Liabilities.



                                       10


         (b) Any  interest  incurred by the Parent  Group  related to filing its
consolidated  return shall be  specifically  allocated  to the  member(s) of the
Parent Group to whom such  interest is directly  attributable  (and shall become
part of the  Subsidiary  Group Tax  Liability  for any  Subsidiary  Group  which
includes  that  member(s),   provided  however,   that  interest  shall  not  be
specifically  allocated  to any  particular  member or  Subsidiary  Group if the
imposition of such interest is not directly attributable to the acts, errors, or
omissions of the member.  Interest not  specifically  allocated  pursuant to the
previous  sentence  shall be allocated  among the Members on a pro rata basis in
accordance with their separate tax liabilities.  For this purpose,  the Parent's
separate tax liability shall be equal to the difference between the Parent Group
Tax Liability and the aggregate of all Subsidiary Group Tax Liabilities.

Section Twelve:  Members Leaving Group

         (a) In the event that any member of the Parent Group at any time leaves
the Parent Group and,  under any applicable  statutory  provision or regulation,
that member is assigned and is deemed to take with it all or a portion of any of
the  tax   attributes   (including,   but  not  limited  to,  NOLs,   or  credit
carryforwards,  of the Parent  Group),  then,  to the extent the  amounts of the
attributes  so taken  differs  from the  amounts of such  attributes  previously
allocated  to such  member  under  this  agreement,  the  leaving  member  shall
appropriately  settle with the Parent Group.  Such  settlement  shall consist of
payment on a dollar for dollar basis for all  differences in credits and, in the
case of NOL carryforward differences,  in an amount computed by reference to the
highest  marginal  corporate tax rate in the year in which the member leaves the
Parent Group.  The  settlement  amounts  shall be allocated  among the remaining
members of the Parent Group in  proportion  to the relative  level of attributes
possessed  by each member and the  attributes  of each member  shall be adjusted
accordingly.

Section Thirteen:  Changes in Parties

         (a) New direct or indirect  subsidiaries,  affiliates and associates of
Parent,  which  may  come  into  existence  after  the  effective  date  of this
Agreement,  may become additional  "Subsidiaries" or "Participants," as the case
may be, and subject to this  Agreement.  In addition,  entities which are, as of
the  effective  date  of  this  Agreement,   direct  or  indirect  subsidiaries,
affiliates and associates of Parent,  may thereafter  leave the holding  company
system,  in which case they will no longer be subject to this  Agreement for tax
years after their departure, except for the obligations in Section 12 hereof.

         (b) The addition of a new direct or indirect  subsidiary,  affiliate or
associate  company  is  intended  to be  evidenced  by the  signing of a written
joinder to this Agreement but,  notwithstanding the failure of a new subsidiary,
affiliate or associate  company to sign a written  joinder,  the new subsidiary,
affiliate or associate company shall be conclusively deemed to have accepted and
agreed to the terms of this  Agreement  by reason of its  inclusion  in Parent's
consolidated  Federal  income tax return  and/or any state and local  income tax
returns filed on a combined,  unitary,  consolidated or similar basis with other
members of the Parent group.



                                       11



Section Fourteen:  Miscellaneous Provisions

         (a) This  Agreement  contains the entire  understanding  of the parties
with  respect to the  subject  matter of this  Agreement,  except  that  nothing
contained in this  Agreement  shall be construed to prevent Parent from entering
into tax benefit  compensation  agreements with members of the Parent Group that
are not also  members  of a  Subsidiary  Group or to prevent a  Subsidiary  from
entering  into similar  agreements  with  members of a Subsidiary  Group in each
case,  provided such  agreements  are in compliance  with PUHCA.  No alteration,
amendment,  or modification of any of the terms of this Agreement shall be valid
unless made by an instrument signed in writing by an authorized  officer of each
party.

         (b) This Agreement has been made in and shall be construed and enforced
in accordance with the laws of the  Commonwealth  of  Pennsylvania  from time to
time in effect.

         (c)  Notwithstanding  any provision of this  Agreement to the contrary,
income tax shall be allocated among the parties in a manner consistent with Rule
45(c)(2)(ii) of PUHCA. Under no circumstances  shall the amount of tax liability
allocated to a Member under this Agreement exceed its tax liability  computed on
a separate company basis.

         (d)  This  Agreement  may be  executed  simultaneously  in two or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

         (e) All notices and other  communications  hereunder shall be deemed to
have been duly given if delivered  by hand or mailed by certified or  registered
mail, postage prepaid:

                 (i)      if to Parent:
                          10 S. Dearborn Street
                          Chicago, Illinois 60603

                 (ii)     if to PECO Energy Company:
                          2301 Market Street
                          Philadelphia, Pennsylvania 19103

                 (iii)    if to Exelon Ventures Company, LLC:
                          10 S. Dearborn Street
                          Chicago, Illinois 60603

                 (iv)     if to Exelon Energy Delivery Company, LLC:
                          10 S. Dearborn Street
                          Chicago, Illinois 60603

                 (v)      if to Commonwealth Edison Company:
                          10 S. Dearborn Street
                          Chicago, Illinois 60603



                                       12




                 (vi)     if to Unicom Investment, Inc.:
                          10 S. Dearborn Street
                          Chicago, Illinois 60603

                 (vii)    if to Exelon Business Services Company:
                          10 S. Dearborn Street
                          Chicago, Illinois 60603

                 (viii)   if to Exelon Generation Company, LLC:
                          300 Exelon Way
                          Kennett Square, Pennsylvania 19348

                 (ix)     if to Exelon Enterprises Company, LLC:
                          10 S. Dearborn Street
                          Chicago, Illinois 60603

                 (x)      if to any other Participant, to the address listed for
                          such Participant on Schedule A.

         (f) The  headings of the  Sections of this  Agreement  are inserted for
convenience only and shall not constitute a part of the Agreement.

                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Agreement to be duly executed and their respective corporate seals to be affixed
hereto, all as of the date and year first above written.



                                                  
                                                     Exelon Corporation


                                                     By:
                                                        --------------------------------------------------
                                                          Ruth Ann Gillis
                                                          Senior Vice President and
                                                          Chief Financial Officer

                                                     Exelon Business Services Company


                                                     By:
                                                        --------------------------------------------------
                                                          J. Barry Mitchell
                                                          Senior Vice President, Treasurer



                                       13



                                                     Exelon Energy Delivery Company, LLC


                                                     By:
                                                        --------------------------------------------------
                                                          Thomas P. Hill
                                                          Vice President, Finance and
                                                          Chief Financial Officer

                                                     PECO Energy Company


                                                     By:
                                                        --------------------------------------------------
                                                          Frank Frankowski
                                                          Vice President, Treasurer and
                                                          Chief Financial Officer

                                                     Exelon Ventures Company, LLC


                                                     By:
                                                        --------------------------------------------------
                                                          J. Barry Mitchell
                                                          Senior Vice President, Treasurer


                                                     Unicom Investment, Inc.


                                                     By:
                                                        --------------------------------------------------
                                                          Patricia L. Kampling
                                                          Treasurer

                                                     Commonwealth Edison Company


                                                     By:
                                                        --------------------------------------------------
                                                          J. Barry Mitchell
                                                          Senior Vice President, Treasurer

                                                     Aconite Corporation


                                                     By:
                                                        --------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary



                                       14



                                                     Adwin Equipment Company


                                                     By:
                                                        --------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Adwin Realty Company


                                                     By:
                                                        --------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     AllEnergy Gas & Electric Marketing Company, LLC


                                                     By:
                                                        --------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Amergen Energy Company, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd. D. Cutler
                                                          Assistant Secretary

                                                     AmerGen Vermont, LLC


                                                     By
                                                        --------------------------------------------------
                                                          Todd. D. Cutler
                                                          Assistant Secretary

                                                     ATNP Finance Company


                                                     By:
                                                        --------------------------------------------------
                                                          Todd. D. Cutler
                                                          Assistant Secretary




                                       15



                                                     Cenesco Company, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd. D. Cutler
                                                          Assistant Secretary

                                                     Chowns Communications, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     ComEd Funding, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Commonwealth Edison Company of Indiana, Inc.

                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Commonwealth Research Corporation


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Dacon Corporation


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary



                                       16




                                                     Dashiell Corporation


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Dashiell Holdings Corp.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Edison Development Company


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     EEI Telecommunications, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     EEI Telecommunications
                                                     Holdings, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     EIS Engineering


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary




                                       17



                                                     EIS Investments, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Electric Services, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Energy Trading Company


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     ETT Arizona, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     ETT Boston, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     ETT Houston, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary




                                       18



                                                     ETT National Power, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     ETT Nevada, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     ETT North America, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Exelon Allowance Management Company, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                    Exelon Capital Partners, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon Communications Holdings, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary




                                       19



                                                     Exelon Communications Company, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon Energy Ohio, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Exelon Enterprises Company, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon Enterprises Investments, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon Enterprises Management, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon (Fossil) Holdings, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary




                                       20



                                                     Exelon Generation Company, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon Generation Finance Company


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon Peaker Development General, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon Peaker Development Limited, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon Power Holdings, LP


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Exelon Services, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary




                                       21



                                                     Exelon Thermal Development, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Exelon Thermal Holdings, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Exelon Thermal Technologies, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     ExTel CORPORATION, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     ExTex La Porte Limited Partnership


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Fischbach and Moore Electric, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary




                                       22



                                                     Fischbach and Moore, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Fischbach and Moore Electrical Contracting, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Gas Distribution Contractors, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Horizon Energy Company


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Infrasource Corporate Services


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Infrasource, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary



                                       23



                                                     Infrasource Integrated Services, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     International Communications Services, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     M.J. Electric, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Mechanical Specialties Incorporated


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Michigan Trenching Service, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Mid-Atlantic Pipeliners, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary




                                       24



                                                     MRM Technical Group, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Mueller Distribution Contractors, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Mueller Energy Services, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Mueller Pipeliners, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     NEWCOTRA, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Northwind Chicago, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary




                                       25



                                                     Northwind Midway, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Northwind Thermal Technologies, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     OSP Consultants, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     OSP Telecom, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     OSP, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     P.A.C.E. Environmental, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary




                                       26



                                                     P.A.C.E. Field Service, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     PEC Financial Services, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     PECO Energy Capital Corp.


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     PECO Energy Power Company


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     PECO Energy Transaction Trust


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Penesco Company, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary




                                       27



                                                     PHT Holdings, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Port City Power, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Rand-Bright Corporation


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     RJE Telecom, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Scherer Holding 1, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Scherer Holding 2, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary




                                       28



                                                     Scherer Holding 3, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Spruce Holdings G.P. 2000, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Spruce Holdings L.P. 2000, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     SUnesys of Virginia, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Assistant Secretary

                                                     SUNESYS, INC.

                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Assistant Secretary

                                                     Susquehanna Electric Company


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary

                                                     Susquehanna Power Company


                                                     By:
                                                         -------------------------------------------------
                                                          Todd D. Cutler
                                                          Assistant Secretary





                                       29


                                                     Syracuse Merit Electric, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     T.H. Green Electric Company, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Texas Ohio Gas, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     The Properties of the Susquehanna Canal


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Trinity Industries, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     Unicom Power Holdings, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary



                                       30



                                                     Unicom Power Marketing, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Unicom Resources, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Utility Locate & Mapping Services, Inc.


                                                      By:
                                                          ---------------------------------------
                                                          Harvey B. Dikter
                                                          Secretary

                                                     UTT Nevada, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     VSI Group, Inc.


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

                                                     Wansley Holdings 1, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary



                                       31



                                                     Wansley Holdings 2, LLC


                                                     By:
                                                         -------------------------------------------------
                                                          Scott N. Peters
                                                          Assistant Secretary

















                                       32








                                   SCHEDULE A



                                                      
Aconite Corporation                                     Dacon Corporation
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

Adwin Equipment Company                                 Dashiell Corporation
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

Adwin Realty Company                                    Dashiell Holdings Corp.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

AllEnergy Gas & Electric Marketing Company, LLC         Edison Development Company
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

AmerGen Vermont, LLC                                    EEI Telecommunications, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

ATNP Finance Company                                    EEI Telecommunications Holdings, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

Cenesco Company, LLC                                    EIS Engineering, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

Chowns Communications, Inc.                             EIS Investments, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

ComEd Funding, LLC                                      Electric Services, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

Commonwealth Edison Company of Indiana, Inc.            Energy Trading Company
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

Commonwealth Research Corporation                       ETT Arizona, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60604                                 Chicago, Illinois 60603

ETT Boston, Inc.                                        Exelon Energy Ohio, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603





ETT Houston, Inc.                                       Exelon Enterprises Investments, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

ETT National Power, Inc.                                Exelon Enterprises Management, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

ETT Nevada, Inc.                                        Exelon (Fossil) Holdings, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

ETT North America, Inc.                                 Exelon Generation Finance Company
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Exelon Allowance Management Company, LLC                Exelon Generation Company International, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Exelon Capital Partners, Inc.                           Exelon Peaker Development General, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Exelon Communications Holdings, LLC                     Exelon Peaker Development Limited, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Exelon Communications Company, LLC                      Horizon Energy Company
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Exelon Energy Company                                   Infrasource, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Exelon Power Holdings, L.P.                             Infrasource Integrated Services, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Exelon Services, Inc.                                   Infrasource Corporate Services
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603


Exelon Thermal Development, Inc.
10 S. Dearborn Street
Chicago, Illinois 60603








Exelon Thermal Holdings, Inc.                           International Communications Services, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Exelon Thermal Technologies, Inc.                       M.J. Electric, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

ExTel Corporation, LLC                                  Mechanical Specialties Incorporated
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

ExTex La Porte Limited Partnership                      Michigan Trenching Service, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Fischbach and Moore Electric, Inc.                      Mid-Atlantic Pipeliners, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Fischbach and Moore Electrical Contracting, Inc.        MRM Technical Group, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Fischbach and Moore, Inc.                               Mueller Distribution Contractors, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Mueller Pipeliners, Inc.                                PECO Energy Capital Corp.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

NEWCOTRA, Inc.                                          PECO Energy Power Company
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Northwind Chicago, LLC                                  PECO Energy Transaction Trust
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Northwind Midway LLC
10 S. Dearborn Street
Chicago, Illinois 60603







Northwind Termal Technologies, Inc.                     Penesco Company, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

OSP Consultants, Inc.                                   PHT Holdings, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

OSP Telecom, Inc.                                       Port City Power, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

OSP, Inc.                                               Rand-Bright Corporation
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

P.A.C.E. Environmental, LLC                             RJE Telecom, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

P.A.C.E. Field Service, LLC                             Scherer Holding 1, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

PEC Financial Services LLC                              Scherer Holding 2, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Scherer Holding 3, LLC                                  Unicom Power Holdings, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Spruce Holdings G.P. 2000, LLC                          Unicom Power Marketing, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Spruce Holdings L.P. 2000, LLC                          Unicom Resources, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Sunesys of Virginia, Inc.                               Utility Locate & Mapping Services, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Susquehanna Electric Company                            UTT Nevada, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Susquehanna Power Company                               VSI Group, Inc.
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603







T.H. Green Electric Company, Inc.                       Wansley Holdings 1, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

Texas Ohio Gas, Inc.                                    Wansley Holdings 2, LLC
10 S. Dearborn Street                                   10 S. Dearborn Street
Chicago, Illinois 60603                                 Chicago, Illinois 60603

The Properties of the Susquehanna Canal
10 S. Dearborn Street
Chicago, Illinois 60603

Trinity Industries, Inc.
10 S. Dearborn Street
Chicago, Illinois 60603




E.        None

F.        SCHEDULES SUPPORTING ITEMS OF THE REPORT.

          *F.1      The consent of the independent accountants as to their
                    opinion on Exelon's consolidated financial statements and
                    the footnotes is included in Exhibit F.1.


Exhibit F.1


                       CONSENT OF INDEPENDENT ACCOUNTANTS


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




PricewaterhouseCoopers
Chicago, Illinois
April 30, 2001



          *F.2      Supporting plant, depreciation and reserve schedules for
                    Commonwealth Edison Company and Commonwealth Edison Company
                    of Indiana, Inc. from FERC Form No. 1 - Annual Report of
                    Major Electric Utilities, Licensees, and Others as follows:
                    (previously filed on Form SE)

                    Summary of Utility Plant and Accumulated Provisions for
                    Depreciation, Amortization and Depletion

                    Nuclear Fuel Materials

                    Electric Plant in Service

                    Electric Plant Held for Future Use

                    Construction Work in Progress - Electric




                    Accumulated Provision for Depreciation of Electric Utility
                    Plant

                    Non-utility Property

          **F.3     Supporting plant, depreciation and reserve schedules for
                    PECO and SECO from FERC Form No. 1 - Annual Report of Major
                    Electric Utilities, Licensees, and Others and the Annual
                    Report to the Pennsylvania Public Utility Commission filed
                    herewith on Form SE.

                    Summary of Utility Plant and Accumulated Provisions for
                    Depreciation, Amortization and Depletion

                    Nuclear Fuel Materials

                    Electric Plant in Service

                    Electric Plant Held for Future Use

                    Construction Work in Progress - Electric

                    Accumulated Provision for Depreciation of Electric Utility
                    Plant

                    Non-utility Property

                    Utility Plant and Adjustments

                    Completed Construction not Classified

                    Preliminary Retirement Estimates

                    Accumulated Provision for Depreciation, Amortization, and
                    Depletion of Plant and Adjustments

G.        FINANCIAL DATA SCHEDULES

          Not available, as financial data schedules are no longer required to
          be filed.

*H.       ORGANIZATION CHART

          (Previously filed on Form SE)

I.        EWG OR FOREIGN UTILITY COMPANY FINANCIAL STATEMENTS

          **I.1     AmerGen Energy Company LLC Financial Statements

                    Filed confidentially on Form SE.

          **I.2     Sithe Energies, Inc. and Subsidiaries Consolidated Financial
                    Statements

                    Filed confidentially on Form SE.



                                    SIGNATURE


Exelon Corporation, a registered holding company, has duly caused this annual
report for the year ended December 31, 2000 to be signed on its behalf by the
undersigned thereunto duly authorized, pursuant to the requirements of the
Public Utility Holding Company Act of 1935.


                                                   EXELON CORPORATION


                                                   By:  /S/ Ruth Ann M. Gillis
                                                        ---------------------
                                                          Ruth Ann M. Gillis
                                                      Senior Vice President and
                                                        Chief Financial Officer


April 30, 2002