UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                    FORM 11-K


               [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                   For the fiscal year ended December 31, 2000


                                       OR


             [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                         Commission file number: 1-16169


                    PECO Energy Company Employee Savings Plan
            Commonwealth Edison Employee Savings and Investment Plan
                            (Full title of the plan)


                               EXELON CORPORATION
                      10 South Dearborn Street - 37th Floor
                                 P.O. Box 805379
                          Chicago, Illinois 60680-5379
         (Name of the issuer of the securities held pursuant to the plan
               And the address of its principal executive offices)



                                TABLE OF CONTENTS

                                                                        Page No.
                                                                        --------

PECO Energy Company Employee Savings Plan
-----------------------------------------
Independent Auditors' Report                                                 2
Report of Independent Accountants                                            3
Financial Statements:
     Statements of Net Assets Available for Benefits,
         as of December 31, 2000 and 1999                                    4
     Statements of Changes in Net Assets Available for
         Benefits for the years ended December 31, 2000 and 1999             5
Notes to Financial Statements                                                6
Supplemental Schedules:
     Schedule of Assets Held for Investment Purposes as of
         December 31, 2000, Schedule H, Part IV, Item 4i, Form 5500         13



Commonwealth Edison Employee Savings and Investment Plan
--------------------------------------------------------
Independent Auditors' Report                                                14
Financial Statements:
     Statements of Net Assets Available for Benefits,
         as of December 31, 2000 and 1999                                   15
     Statements of Changes in Net Assets Available for
         Benefits for the years ended December 31, 2000 and 1999            16
Notes to Financial Statements                                               17
Supplemental Schedules:
     Schedule of Assets Held for Investment Purposes as of
         December 31, 2000, Schedule H, Part IV, Item 4i, Form 5500         29



List of Exhibits                                                            34

Signatures                                                                  35

Exhibits                                                                    36

                                       1



                          Independent Auditors' Report


To the Participants and the Compensation
Committee of the PECO Energy Company
Employee Savings Plan:

We have audited the accompanying  statement of net assets available for benefits
of the PECO Energy Company Employee Savings Plan (the "Plan") as of December 31,
2000, and the related  statement of changes in net assets available for benefits
for the year  ended  December  31,  2000.  These  financial  statements  are the
responsibility  of the Plan's  management.  Our  responsibility is to express an
opinion on these  financial  statements  and  schedule  based on our audit.  The
financial  statements of the Plan as of December 31, 1999, were audited by other
auditors whose report dated June 26, 2000,  expressed an unqualified  opinion on
those statements.

We conducted our audit in accordance with generally accepted auditing standards.
Those standards  require that we plan and perform the audit to obtain reasonable
assurance   about  whether  the  financial   statements  are  free  of  material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the net assets available for benefits of the Plan as of
December 31, 2000, and the changes in net assets  available for benefits for the
year then ended, in conformity with generally accepted accounting principles.

Our audit was  performed  for the  purpose  of  forming  an opinion on the basic
financial statements taken as a whole. The supplemental  schedule of Assets Held
for Investment Purposes as of December 31, 2000,  (Schedule H, Part IV, Item 4i,
Form 5500) is  presented  for the purpose of  additional  analysis  and is not a
required  part  of  the  basic  financial   statements  but  are   supplementary
information  required by the  Department  of Labor's Rules and  Regulations  for
Reporting and Disclosure  under the Employee  Retirement  Income Security Act of
1974. This supplemental schedule is the responsibility of the Plan's management.
The supplemental  schedule has been subjected to the auditing procedures applied
in the audit of the basic financial  statements and, in our opinion,  are fairly
stated in all material  respects in relation to the basic  financial  statements
taken as a whole.


Hill, Taylor LLC

Chicago, Illinois
June 15, 2001

                                       2



                        Report of Independent Accountants


To the Participants and Administrator of the
PECO Energy Company Employee Savings Plan:

In our opinion, the accompanying statements of net assets available for benefits
and the  related  statements  of changes in net assets  available  for  benefits
present fairly, in all material respects,  the net assets available for benefits
of the PECO Energy  Company  Employee  Savings Plan (the "Plan") at December 31,
1999,  and the changes in net assets  available  for benefits for the year ended
December 31, 1999 in conformity with accounting principles generally accepted in
the United States of America.  These financial statements are the responsibility
of the Plan's  management;  our responsibility is to express an opinion on these
financial  statements  based on our  audits.  We  conducted  our  audit of these
statements  in  accordance  with auditing  standards  generally  accepted in the
United  States of America,  which  require that we plan and perform the audit to
obtain reasonable  assurance about whether the financial  statements are free of
material  misstatement.  An audit includes examining,  on a test basis, evidence
supporting the amounts and  disclosures in the financial  statements,  assessing
the accounting principles used and significant estimates made by management, and
evaluating the overall  financial  statement  presentation.  We believe that our
audit provides a reasonable basis for our opinion.



PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania
June 26, 2000


                                       3

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

                 Statement of Net Assets Available for Benefits
                        as of December 31, 2000 and 1999



                                                                 2000                1999
                                                             ------------        ------------
                                                                           
Investments, at fair value (see Note 3 - Investments)        $777,865,912        $812,725,928
                                                             ------------        ------------

Net assets available for benefits                            $777,865,912        $812,725,928
                                                             ============        ============



                       See notes to financial statements.

                                        4

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

            Statement of Changes in Net Assets Available for Benefits
                 for the years ended December 31, 2000 and 1999



                                                  2000                  1999
                                             -------------         -------------
                                                             
Additions:
   Employee contributions                    $  34,369,918         $  32,677,666
   Employer contributions                       10,823,678             7,112,506
                                             -------------         -------------

        Total contributions                     45,193,596            39,790,172

   Investment income:
      Interest                                   3,143,403             3,918,621

      Dividends                                100,180,002            54,898,793

   Net appreciation (depreciation) in
        fair value of investments             (127,302,628)           70,936,190

   Interest on loan repayments                   1,141,153             1,183,195

                                             -------------         -------------
                                                22,355,526           170,726,971

Deductions:
   Distributions                                57,215,542            45,324,125

                                             -------------         -------------

Net additions (deductions)                     (34,860,016)          125,402,846

Net assets available for benefits:
   Beginning of year                           812,725,928           687,323,082
                                             -------------         -------------

   End of year                               $ 777,865,912         $ 812,725,928
                                             =============         =============


                       See notes to financial statements.

                                        5

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

                          Notes to Financial Statements

1.   Description of the PECO Energy Company Employee Savings Plan:

     The following  description of the PECO Energy Company Employee Savings Plan
     (Plan) provides only general information.  Participants should refer to the
     Plan agreement for a complete description of the Plan's provisions.

     General - The Plan is a trusteed  defined  contribution  plan. The Plan was
     formed on January 1, 1984 for the purpose of allowing eligible employees of
     PECO Energy Company and subsidiaries  (PECO) to reduce their taxable income
     pursuant  to  Section  401(k) of the  Internal  Revenue  Code.  The Plan is
     subject to the provisions of the Employee Retirement Income Security Act of
     1974 (ERISA).

     On  October  20,  2000,  Exelon  Corporation  (Exelon)  became  the  parent
     corporation  of PECO as a  result  of the  completion  of the  transactions
     contemplated  by an Agreement and Plan of Exchange and Merger,  as amended,
     among PECO, Unicom Corporation, and Exelon.

     Effective  May  1,  2000,  all  new  employees   classified  as  "regular,"
     "part-time" or  "probationary"  become  eligible to participate in the Plan
     immediately.  Prior to May 1, 2000, all employees  classified as "regular,"
     "part-time" or  "probationary"  became  eligible to participate in the Plan
     upon completion of six months of service.

     Contributions - Participants  elect to have PECO make  contributions to the
     Plan on their behalf.  Such  contributions  are made by authorizing PECO to
     withhold from the participants'  salary an amount equal to the contribution
     to be made.  Participants may elect to authorize PECO to contribute from 1%
     to 17% of their base  salary  depending  upon  their  salary  level,  up to
     certain IRS limits.

     Effective September 1, 2000, PECO's matching contribution increased from 50
     cents to one dollar on each dollar of employee contributions up to 5% of an
     employee's  base salary.  Prior to September 1, 2000,  PECO made a matching
     contribution of 50 cents on each dollar of employee  contributions up to 5%
     of an employee's base salary deposited into the Plan.  Employees are always
     fully vested on employer contributions.

     Fidelity Investments is the Record Keeper and Trustee for the Plan.

     Participants may elect that their  contributions be invested in one or more
     of the following generic fund categories - Growth, Growth and Income, Small
     Capitalization   Growth,   Equity  Income,   Money   Market/Stable   Value,
     International,  Fixed Income,  Balanced, Asset Allocation or Company Stock.
     See Note 3 - Investments.

                                       6

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

                          Notes to Financial Statements

1.   Description of the PECO Energy Company Employee Savings Plan, Continued:

     Distributions  and  exchanges  can be made on a daily  basis  provided  the
     market is open and the request is confirmed  by the Record  Keeper prior to
     4:00 p.m. EST.

     By giving notice to the Plan Record Keeper and subject to rules established
     by the Plan Administrator, participants may suspend or change the amount of
     their  contributions  and exchange their  investments  among the investment
     funds.

     Participant  Accounts - Each  participant's  account is  credited  with the
     participant's  contribution,  PECO's contribution and an allocation of Plan
     earnings.

     Payment of Benefits - Upon termination of service due to death, disability,
     or  retirement,  a participant is entitled to a benefit amount equal to the
     value of the  participant's  account.  This  benefit can be paid by various
     methods based upon certain  elections made by the  participant  pursuant to
     the provisions of the Plan. For termination of service for other reasons, a
     participant  may  receive  the value of his or her  account  as a  lump-sum
     distribution.

     Participant  Loans  -  The  Plan  allows   participants  to  obtain  loans.
     Participants  may borrow up to 50% of their account  balances  subject to a
     minimum  of $500 and a maximum  of  $50,000.  Loans  have terms of up to 30
     years for the  purchase  of a primary  residence  or one to four  years for
     other  purposes  and  bear  interest  at  rates   determined  by  the  Plan
     Administrator  based  on  similar  rates  charged  by  regional  commercial
     lenders.  Loans are  repayable  in equal  installments  by means of payroll
     deductions.  A participant  may not have more than one loan  outstanding at
     any time or take more than one loan in a plan year.


2.   Summary of Significant Accounting Policies:

     Valuation of Investments and Income Recognition
     -----------------------------------------------
     Investments  in mutual funds and the Managed  Income  Portfolio II fund are
     valued at the  reported  net asset  value on the last day of the year.  The
     Fidelity Money Market Fund is valued at the cost of contributions made plus
     earnings less withdrawals. The Exelon Common Stock Fund is valued primarily
     using the  closing  stock  price of Exelon.  The  insurance  contract  is a
     benefit-responsive guaranteed investment contract and is valued at contract
     value.  Contract value represents the cost of contributions  made under the
     contract plus earnings at the contract rate less withdrawals. Purchases and
     sales of

                                       7

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

                          Notes to Financial Statements

2.   Summary of Significant Accounting Policies, Continued:

     investments  are  reflected  on a  trade-date  basis.  Dividend  income  is
     recorded when declared payable.

     Net Appreciation/(Depreciation) in Investments
     ----------------------------------------------
     The Plan presents in the  statement of changes in net assets  available for
     benefits  the net  appreciation/(depreciation)  in the  fair  value  of its
     investments  which  consists  of the  realized  gains  or  losses  and  the
     unrealized appreciation/(depreciation) on those investments.

     Distributions
     -------------
     Distributions are recorded when paid.

     Concentration of Credit Risk
     ----------------------------
     The Plan invested in a  benefit-responsive  guaranteed  investment contract
     with one  insurance  company and is subject to credit risk with  respect to
     that insurance company.  This risk is partially  mitigated by the fact that
     A.M. Best gives the insurance company an `A' or excellent rating.

     Use of Estimates
     ----------------
     The  preparation  of financial  statements  in  conformity  with  generally
     accepted  accounting  principles  requires management to make estimates and
     assumptions  that affect the reported  amounts of assets,  liabilities  and
     changes  therein,  and  disclosure  of contingent  assets and  liabilities.
     Actual results could differ from those estimates.

     Risk and Uncertainties
     ----------------------
     The Plan  provides for various  investment  options in any  combination  of
     stocks, bonds, fixed income securities,  mutual funds, and other investment
     securities.  Investment  securities are exposed to various  risks,  such as
     interest rate risk,  market risk and credit risk.  Due to the level of risk
     associated with certain investment  securities and the level of uncertainty
     related to changes in the value of  investment  securities,  it is at least
     reasonably possible that changes in risks in the near term would materially
     affect  participants'  account  balances  and the  amounts  reported in the
     statement of net assets available for benefits and the statement of changes
     in net assets available for benefits.

     New Accounting Pronouncements
     -----------------------------
     In June 1998,  the  Financial  Accounting  Standards  Board  (FASB)  issued
     Statement of Financial  Accounting Standards (SFAS) No. 133 "Accounting for
     Derivative Instruments and Hedging Activities," to establish accounting and
     reporting standards for derivatives.

                                       8

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

                          Notes to Financial Statements

2.   Summary of Significant Accounting Policies, Continued:

     The new standard  requires  recognizing all derivatives as either assets or
     liabilities  on the  balance  sheet at their fair value and  specifies  the
     accounting  for  changes  in  fair  value  depending  on  the  use  of  the
     derivative.  In June 1999,  the FASB issued SFAS No. 137,  "Accounting  for
     Derivative  Instruments and Hedging  Activities - Deferral of the Effective
     Date of FASB  Statement No. 133," which delayed the effective date for SFAS
     No. 133 until fiscal years  beginning  after June 15, 2000.  Currently  the
     plan does not hold any  derivative  instruments  or  engage in any  hedging
     activities.  As a result, the adoption of SFAS No. 133 had no impact on the
     Plans financial statements.

     In September 1999, the Accounting  Standards Executive Committee issued SOP
     99-3,  "Accounting for and Reporting of Certain Defined  Contribution  Plan
     Investments and other  Disclosures  Matters,"  which provides  guidance for
     presentation and disclosures of participant-directed investments in defined
     contribution  plan's  financial  statements.  Accordingly,  the  previously
     required "by-fund" disclosures are eliminated in the accompanying financial
     statements.


3.   Investments:

     The Plan investments consist of the following types of funds:

     Growth - The growth mutual funds invest  primarily in common stocks of U.S.
     and international companies that are considered undervalued or out of favor
     and whose products show potential for improvement.  Investments can include
     any type of security  that may produce  capital  growth.  The goal of these
     funds is to provide capital growth over the long-term.

     Growth and Income - The growth and income mutual fund invests  primarily in
     common stocks, focusing on larger, more established companies.  Investments
     are diversified among many different types of companies and industries. The
     goal of these  funds is to  provide  capital  growth  and  income  over the
     long-term.

     Small  Capitalization  -  The  small  capitalization  growth  fund  invests
     primarily in stocks of companies which have market  capitalizations of less
     than $1 billion at the time of investment.  The fund tries to keep at least
     one-third of its assets in stocks of companies with market  capitalizations
     of $550 million or less and also invests up to 25% of its assets in foreign
     securities.  This  fund's  goal  is to  provide  capital  growth  over  the
     long-term.

                                       9

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

                          Notes to Financial Statements

3.   Investments, Continued:

     Equity  Income  - The  equity  income  mutual  fund  invests  primarily  in
     attractively priced,  dividend paying,  income-producing equity securities;
     including common and preferred  stocks,  convertible  securities,  and debt
     securities  (bonds).  The goal of this fund is to invest for capital growth
     and current income.

     Money Market/Stable Value Fund - The money market/stable value fund invests
     primarily in investment grade,  short-term,  U.S.  dollar-denominated money
     market  securities  of domestic and foreign  issuers.  Investments  include
     short-term  corporate  obligations,   U.S.  government   obligations,   and
     certificates of deposit. The goal of this fund is to preserve participants'
     principal, maintain a stable price, and provide current income.

     International - The  international  fund invests primarily in common stocks
     of companies in developed  markets  outside the United States.  The goal of
     this fund is to provide  capital  growth over the  long-term  by  investing
     internationally.

     Fixed  Income  Fund - This  fund  is  comprised  of  both  contracted  rate
     investments  through  a  managed  income  portfolio  as well  as  insurance
     contracts.  The contract rate is  established  at the  commencement  of the
     contract and remains  fixed  (except for certain  conditions)  at that rate
     until maturity.  The contract rate reflects market and other  conditions at
     the commencement of the contract.

     Balanced Fund - The balanced fund invests primarily in a diversified mix of
     common and  preferred  stocks,  and  investment  grade  bonds.  The fund is
     diversified among many sectors and industries.  The goal of this fund is to
     provide  regular  income,  conservation of principal and an opportunity for
     long-term growth of principal and income.

     Asset  Allocation Fund - The asset  allocation  funds invest primarily in a
     blend  of  stocks,  bonds,  and  short-term  investments  based on a target
     retirement date. The funds will gradually adopt a more  conservative  asset
     allocation  over  time,  and  therefore   their  target  asset   allocation
     percentages  will  change to become  more  conservative.  The goal of these
     funds is to seek to provide a high total return while preserving  principal
     as the funds approach maturity.

     Company  Common Stock Fund - This fund invests  primarily in Exelon  common
     stock  and  a  small  amount  of  short-term   investments   which  enables
     participants  to buy or sell without the usual trade  settlement  period of
     individual stock transactions.  Before the merger, the Company Common Stock
     category represented primarily PECO's Common Stock.

                                       10

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

                          Notes to Financial Statements

3.   Investments, Continued:

     As of December 31, 2000 and 1999, respectively, the Plan held the following
     investments,  each of which  accounted  for more  than 5% of the  total net
     assets available for benefits:

     Investments                                2000               1999
     -------------------------------        ------------        ------------

     Legg Mason NAV Value Trust Fund        $275,827,615        $331,945,229
     Fidelity Contrafund                    $178,449,811        $207,589,326
     Putnam Growth & Income Fund A*         $         --        $ 69,122,232
     Fidelity Fund*                         $ 52,138,740        $         --
     Exelon Common Stock Fund**             $ 49,172,716        $         --
     Franklin Small Cap. Growth***          $ 39,100,637        $         --

     *The Putnam  Growth and Income Fund A was replaced by the Fidelity  Fund on
     June 30, 2000.
     **The  Exelon  Common  Stock Fund  replaced  the PECO Common  Stock Fund on
     October 20,  2000.  The PECO Comon Stock Fund did not  represent  5% of net
     assets at December 31, 1999.
     ***The  Franklin Small Cap.  Growth Fund did not represent 5% of net assets
     at December 31, 1999.

     During 2000 and 1999, the Plan's investments (including gains and losses on
     investments  bought and sold, as well as held during the year)  depreciated
     by $127,302,628 and appreciated by $70,936,190,  respectively,  as follows:

                              2000                  1999
                         -------------         -------------

     Mutual Funds        $(152,392,489)        $  75,902,582
     Common Stock           25,089,861            (4,966,392)
                         -------------         -------------

     Total               $(127,302,628)        $  70,936,190
                         =============         =============

     As of  December  31,  2000,  the Plan held an  insurance  contract  with an
     interest rate of 7.13%.  As of December 31, 1999,  the Plan held  insurance
     contracts with interest rates of 6.30% and 7.13%.


4.   Plan Termination:

     PECO may  terminate  the Plan in  whole  or in part at any  time.  Any such
     termination,  partial  termination or discontinuance of contributions shall
     be effected only upon  condition  that such action is taken as shall render
     it  impossible  for any part of the  assets of the Plan to be used for,  or
     diverted  to,  purposes  other  than  the  exclusive  benefit  of the  Plan
     participants and their beneficiaries.

                                       11

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

                          Notes to Financial Statements

5.   Tax Status:

     The Internal Revenue Service has determined and informed PECO that the Plan
     is qualified under Sections 401(a) and 401(k) of the Internal  Revenue Code
     and that the Plan is exempt from federal income tax under Section 501(a) by
     letter dated April 15, 1995. The Plan has been amended since  receiving the
     original  determination  letter,  however,  PECO  believes that the Plan is
     designed and is currently  being operated in compliance with the applicable
     requirements of the Internal Revenue Code.


6.   General and Administrative Expenses:

     All administrative fees are paid by PECO on behalf of the Plan.


7.   Subsequent Event:

     On January 1, 2001,  Exelon  Corporation  became the  sponsor for the Plan.
     Effective March 30, 2001, the Plan was merged into the Commonwealth  Edison
     Employee Savings and Investment Plan and the resulting plan was amended and
     restated as the Exelon Corporation Employee Savings Plan.



                                       12

                    PECO ENERGY COMPANY EMPLOYEE SAVINGS PLAN

                 Schedule of Assets Held for Investment Purposes
                            as of December 31, 2000
                    Schedule H, Part IV, Item 4i, Form 5500




         b. Identity of Issuer,
  a.        Lessor Similar Party                  c. Description of Investment                       d. Cost           Value
-------  -------------------------------------    ----------------------------------------------- --------------- ---------------
                                                                                                          
         Legg Mason NAV Value Trust                Mutual Fund                                      $ 256,656,540 $   275,827,615
  *      Fidelity Contrafund                       Mutual Fund                                        193,425,974     178,449,811
  *      Fidelity Fund                             Mutual Fund                                         64,935,798      52,138,740
  *      Spartan U.S. Equity Index Fund            Mutual Fund                                         21,465,530      22,980,045
         Franklin Small Capitalization Fund        Mutual Fund                                         42,962,367      39,100,637
  *      Fidelity Retirement Money Market          Mutual Fund                                         29,334,655      29,334,655
         Dodge & Cox Balanced Fund                 Mutual Fund                                         23,953,885      22,537,514
  *      Managed Income Portfolio II               Mutual Fund                                         32,954,414      32,954,414
  *      Fidelity Low Priced Stock Fund            Mutual Fund                                          1,993,747       1,946,552
  *      Fidelity Freedom Income Fund              Mutual Fund                                            623,927         615,649
  *      Fidelity Freedom 2000 Fund                Mutual Fund                                            347,450         319,792
  *      Fidelity Freedom 2010 Fund                Mutual Fund                                          1,507,527       1,404,061
  *      Fidelity Freedom 2020 Fund                Mutual Fund                                          1,646,294       1,488,774
  *      Fidelity Freedom 2030 Fund                Mutual Fund                                            715,403         633,448
         Templeton Foreign Fund                    Mutual Fund                                          5,414,237       5,470,351
         T. Rowe Price Equity Income               Mutual Fund                                          2,547,717       2,633,541
         White Oak Growth Stock Fund               Mutual Fund                                         31,622,211      24,954,567
         Continental Assurance Company (1997)      Insurance Contract maturing 12/29/01, 7.13%          8,180,671       8,180,671
         Continental Assurance Company (1996)      Cash in Transit to Managed Income Portfolio II      12,180,735      12,180,735
  *      Exelon Corporation                        Common stock                                        19,780,388      49,172,716
         Participant Loans                         Rates ranged from 6.62 to 10.50%                             -      15,541,624
                                                                                                    -------------   -------------
                                                                                                    $ 752,249,470   $ 777,865,912
                                                                                                    =============   =============
*-Denotes parties in interest


                                                                 13





                          INDEPENDENT AUDITOR'S REPORT

To the Commonwealth Edison
   Employee Savings and Investment Plan Committee:

We have audited the accompanying statements of net assets available for benefits
of the  COMMONWEALTH  EDISON EMPLOYEE SAVINGS AND INVESTMENT PLAN as of December
31, 2000 and 1999, and the related statements of changes in net assets available
for  benefits  for the years then  ended.  These  financial  statements  are the
responsibility  of the Plan's  management.  Our  responsibility is to express an
opinion on these financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material respects, the net assets available for benefits of the COMMONWEALTH
EDISON  EMPLOYEE  SAVINGS AND INVESTMENT  PLAN as of December 31, 2000 and 1999,
and the changes in net assets  available  for benefits for the years then ended,
in conformity with generally accepted accounting principles.

Our  audits  were  made for the  purpose  of  forming  an  opinion  on the basic
financial statements taken as a whole. The supplemental schedules of assets held
for  investment  purposes,  and reportable  transactions  as of and for the year
ended December 31, 2000,  are presented for purposes of additional  analysis and
are not a required part of the basic financial  statements but are supplementary
information  required by the  Department  of Labor's Rules and  Regulations  for
Reporting and Disclosure  under the Employee  Retirement  Income Security Act of
1974, as amended. The supplemental schedules have been subjected to the auditing
procedures  applied in the audits of the basic financial  statements and, in our
opinion,  are fairly stated, in all material respects,  in relation to the basic
financial statements taken as a whole.


                                            WASHINGTON, PITTMAN & McKEEVER, LLC
Chicago, Illinois
May 29, 2001

                                       14

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                 Statement of Net Assets Available for Benefits
                        As of December 31, 2000 and 1999



                                                                       2000                  1999
                                                                 --------------        --------------
                                                                                 
ASSETS

INVESTMENTS, AT CURRENT VALUE:

          Exelon Corporation Common Stock                        $  102,220,705        $           --
          Unicom Corporation Common Stock                                    --            64,079,169
          Registered Investment Companies                           887,529,219           906,395,077
          Collective Institutional Investment Trust Funds           344,030,149           450,074,192
          Guaranteed Investment Contracts                           174,645,495           164,566,281
          Participant Loans                                          46,322,514            48,136,785
                                                                 --------------        --------------

                    Total Investments                            $1,554,748,082        $1,633,251,504
                                                                 --------------        --------------

RECEIVABLES:
     Employer Contributions                                      $       49,627        $       41,266
     Employee Contributions                                              91,836                74,477
     Accrued Dividends and Interest                                       8,561               772,356
     Due from Broker for Securities Sold                                     --               477,334
     Other Receivables                                                   92,251                45,287
                                                                 --------------        --------------
                                                                 $      242,275        $    1,410,720
                                                                 --------------        --------------

          TOTAL ASSETS                                           $1,554,990,357        $1,634,662,224
                                                                 --------------        --------------

LIABILITIES

     Dividend Distributable to Participants                      $           --        $      763,364
     Due to Broker for Securities Purchased                             590,195               623,607
     Accrued Administrative Expenses and Other
          Liabilities                                                   358,411             1,081,524
                                                                 --------------        --------------

          TOTAL LIABILITIES                                      $      948,606        $    2,468,495
                                                                 --------------        --------------

NET ASSETS AVAILABLE FOR BENEFITS                                $1,554,041,751        $1,632,193,729
                                                                 ==============        ==============

                               See notes to financial statements.

                                               15



                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

            Statement of Changes in Net Assets Available for Benefits
                 for the years ended December 31, 2000 and 1999



                                                              2000                    1999
                                                        ---------------         ---------------
                                                                          
ADDITIONS TO NET ASSETS ATTRIBUTED TO:

INVESTMENT INCOME:
     Dividends on Unicom Corporation
          Common Stock                                  $     2,059,564         $     2,764,440
     Income from Investment in Group, Mutual and
          Collective Investment Trust Funds                  92,133,671              85,405,141
     Income from Participant Loans                            3,892,796               4,222,064
                                                        ---------------         ---------------

     Total Investment Income                            $    98,086,031         $    92,391,645
                                                        ---------------         ---------------

Net Realized Gain (Loss) on Investments                 $    49,484,160         $    24,057,288
Net Unrealized Appreciation
     (Depreciation) of Investments                         (128,934,630)            159,500,229
                                                        ---------------         ---------------
NET APPRECIATION (DEPRECIATION)
     OF INVESTMENTS                                     $   (79,450,470)        $   183,557,517
                                                        ---------------         ---------------

CONTRIBUTIONS:
     Participants                                       $    65,007,062         $    65,972,013
     Employers                                               31,102,322              32,490,841
     Rollovers                                                3,329,015               2,712,028
                                                        ---------------         ---------------

     Total Contributions                                $    99,438,399         $   101,174,882
                                                        ---------------         ---------------

              TOTAL ADDITIONS                           $   118,073,960         $   377,124,044
                                                        ---------------         ---------------


DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO:

WITHDRAWALS BY PARTICIPANTS                             $    95,385,363         $    72,317,177

DIVIDEND DISTRIBUTIONS                                        2,059,564               2,762,215

TRANSFERS TO OTHER PLANS                                     97,706,021                      --

ADMINISTRATIVE EXPENSES                                       1,074,990               1,410,948
                                                        ---------------         ---------------

              TOTAL DEDUCTIONS                          $   196,225,938         $    76,490,340
                                                        ---------------         ---------------

                   NET (DECREASE)/INCREASE              $   (78,151,978)        $   300,633,704

NET ASSETS AVAILABLE FOR BENEFITS:

              BEGINNING OF YEAR                           1,632,193,729           1,331,560,025
                                                        ---------------         ---------------

              END OF YEAR                               $ 1,554,041,751         $ 1,632,193,729
                                                        ===============         ===============

                               See notes to financial statements.

                                               16



                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements


1.  Description of Plan:

          The following  description of the Commonwealth Edison Employee Savings
and Investment  Plan (the "Plan") is provided for general  information  purposes
only.  The  official  text of the  Plan,  as  amended,  should  be read for more
complete information.

          a. General.  The Plan was established by  Commonwealth  Edison Company
(the  "Company"),  effective  March 1,  1983,  to provide a  systematic  savings
program for eligible  employees  and to  supplement  such savings with  Employer
contributions.  The Plan is subject to the provisions of the Employee Retirement
Income Security Act of 1974, as amended  (ERISA),  and the Internal Revenue Code
of 1986, as amended (the "Code").

          The Plan  provides  that any  regular  employee of the Company and any
other  affiliated  company that adopts the Plan with the consent of the Company,
is eligible to elect to  participate  in the Plan.  There were 17,075 and 18,297
participants in the Plan at December 31, 2000 and 1999, respectively. On October
20, 2000 Exelon  Corporation  (Exelon) became the parent corporation for each of
Commonwealth  Edison  Company and PECO Energy  Company (PECO) as a result of the
completion of the transactions contemplated by an Agreement and Plan of Exchange
and Merger, as amended (the "merger"),  among Unicom Corporation (Unicom), PECO,
and Exelon.

          The  Company  is the  administrator  of the  Plan  and  has  the  sole
authority to appoint and remove members of the Plan Committee,  the Trustee, and
any  investment  manager  which may be  provided  for under the Trust.  The Plan
Committee has the  responsibility  for  day-to-day  administration  of the Plan.
Fidelity Management Trust Company is the Plan Trustee and Fidelity Institutional
Retirement Services Company is the Plan recordkeeper.

          b.  Contributions.  The Plan  permits a  participant  to  establish an
After-Tax  Contributions  Account by authorizing  payroll deductions per payroll
period of 1% to 10%, in whole percentages  only, of Compensation,  as defined in
the Plan,  and having such amounts  contributed to the  participant's  After-Tax
Contributions Account.

          A participant may also establish a Before-Tax Contributions Account by
electing to reduce Compensation per payroll period in an amount equivalent to 1%
to 10%, in whole  percentages  only, and having such amounts  contributed to the
participant's Before-Tax Contributions Account.

                                       17

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

1.  Description of Plan, Continued:

          Employer  contributions to the Employer Contribution Account are equal
to  100%  of the  first  2% of  compensation  contributed,  70% of the  next  3%
contributed  and 25% of the  next 1%  contributed.  Employer  contributions  are
invested in the same investment  funds and in the same  percentages as specified
by the participant for the participant's  employee  accounts.  A participant may
also  establish a Rollover  Account to which the  participant  may contribute or
transfer  certain  benefits  earned  under  other  qualified  plans.  The  total
contributions  allocated to a  participant's  accounts for any calendar year are
limited to meet the requirements of the Code.

          c. Investment  Options.  The Plan  investments  are fully  participant
directed.  The  investment  options  provided  under the Plan are  described  as
follows:

          The Unicom  Corporation  Stock Fund was  invested  primarily in common
stock  of the  Unicom  Corporation,  which  was the  parent  corporation  of the
Company.  Effective  October  20,  2000,  the fund was  replaced  by the  Exelon
Corporation  Stock fund and amounts  allocated to the Unicom  Corporation  Stock
investment  alternative were used to purchase shares of Exelon common stock. The
shares of Unicom  common  stock held by the Plan at the date of the merger  were
converted into Exelon common stock in accordance with the merger  agreement.  In
the merger  agreement,  holders of Unicom  common stock  received .875 shares of
Exelon common stock plus $3.00 in cash for each of their shares of Unicom common
stock. Dividends on the stock held by the Fund are paid out to participants.

          The Diversified Fund is invested in the Multi-Asset  Portfolio Fund of
the  Brinson  Trust  Company,   which  invests  primarily  in  corporate  equity
securities and corporate and U. S.  government debt  securities.  Investments by
the Multi-Asset  Portfolio,  a collective  investment  fund, may also be made in
other  appropriate  investments,  including,  but not limited  to, real  estate,
foreign securities, venture capital opportunities and emerging markets.

          The Stated Return Fund is invested primarily in one or more investment
contracts  issued  by  either  one or more  insurance  carriers,  banks or trust
companies.  The  investment  contracts  will  stipulate  rates of  return  to be
credited to funds invested in the contracts for specified  periods of time. Some
synthetic  contracts  ("wrappers")  provide  that the fund may  invest  in fixed
income  securities and bond funds including,  but not limited to, U.S.  Treasury
bonds;  investment grade corporate bonds; agency-,  mortgage-,  and asset-backed
securities; and U.S. obligations of domestic and foreign corporations and banks.
The actual  rate of return of the fund will  depend on the  weighted  average

                                       18

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

1.  Description of Plan, Continued:

return  of all  the  contracts  in  which  such  amounts  are  invested,  and is
determined by the level of contributions to, and withdrawals from, the fund.

          The  Fidelity  Intermediate  Bond Fund is a mutual  fund  invested  in
primarily high grade debt securities  with expected  maturities of five years or
less  from the date of  purchase.  Such  investments  may be made  directly,  or
indirectly through investment in common, collective or pooled investment funds.

          The Fidelity U.S. Equity Index  Commingled Pool is invested  primarily
to perform as closely as  possible  to the  Standard  and Poor's 500 Stock Price
Index. This pooled investment is managed by Fidelity Management Trust Company.

          The Fidelity  Magellan Fund is a mutual fund  invested  primarily in a
diversified  portfolio of common and  preferred  stocks of all types of domestic
and foreign companies.

          The Fidelity  Growth Company Fund is a mutual fund invested  primarily
in common  stock of  companies  with  earnings or gross sales that  indicate the
possibility for above-average growth. These may be companies of any size and may
include newly  established  companies and less well-known  companies in emerging
areas of the economy.

          The Fidelity Asset Manager Fund is a mutual fund invested primarily in
foreign and domestic stocks, bonds and short-term  instruments.  The combination
of these  investments  will be adjusted to reflect  expected market  conditions.
This fund may be  invested  anywhere  from 30% to 70% in  stocks,  20% to 60% in
bonds and 0% to 50% in short-term  instruments,  however, over the long term, it
is expected that this fund will be invested 50% in stocks,  40% in bonds and 10%
in short-term instruments.

          The Fidelity  Puritan Fund is a balanced mutual fund. It seeks as much
income as possible,  consistent with preservation of capital,  by investing in a
broadly diversified  portfolio of domestic and foreign common stocks,  preferred
stocks and bonds, including lower-quality, high-yield debt securities.

          The  Fidelity  Fund is a  growth  and  income  mutual  fund.  It seeks
long-term  capital  growth.  This fund invests  mainly in common stock of large,
well  established  companies in a variety of industries.  This fund selects some
securities  for their  income  characteristics,  which may limit the emphasis on
growth.

                                       19


                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

1.  Description of Plan, Continued:

          The Fidelity  Low-Priced  Stock Fund is a growth mutual fund. It seeks
capital appreciation;  invests mainly in U.S. and foreign low-priced stocks that
may be  undervalued,  overlooked  or out of favor.  Generally,  "low-priced"  is
considered  $25 or less at time of purchase.  These often are stocks of smaller,
less well-known companies. This fund has a redemption fee of 1.5% on shares held
less than 90 days.

          The Fidelity  Dividend Growth Fund is a growth mutual fund which seeks
capital growth. This fund looks for growth  opportunities in companies that have
the potential for increasing their dividends or for commencing dividend payouts,
if none are  currently  paid.  This fund invests  mainly in common and preferred
stocks and securities convertible into common stocks.

          The Fidelity  Freedom Funds are asset  allocation  funds  designed for
investors who want a simple approach to investing for retirement by investing in
a collection  of other  Fidelity  mutual  funds.  Each Freedom Fund invests in a
combination of underlying  Fidelity stock,  bond, and money market mutual funds.
The  allocation  strategy  among the  underlying  stock,  bond, and money market
mutual funds  contained in each  Freedom Fund with a target  retirement  date is
based on the number of years until your  anticipated  retirement.  For the funds
with a target retirement date, the mix of underlying funds will gradually become
more  conservative  over time.  Strategic  Advisers  Inc.  manages the  Fidelity
Freedom Funds.

          The Fidelity  Freedom  Income Fund seeks high current income and, as a
secondary objective,  some capital appreciation for those already in retirement.
It invests  approximately 20% in Fidelity stock mutual funds,  approximately 40%
in Fidelity bond mutual funds,  and  approximately  40% in Fidelity money market
mutual funds.

          The  Fidelity  Freedom  2000 Fund seeks high total  returns  for those
planning  to  retire  in   approximately   1-10  years.  It  initially   invests
approximately 35% in Fidelity stock mutual funds,  approximately 43% in Fidelity
bond mutual funds, and approximately 22% in Fidelity money market mutual funds.

          The  Fidelity  Freedom  2010 Fund seeks high total  returns  for those
planning  to  retire  in  approximately   10-20  years.  It  initially   invests
approximately 55% in Fidelity stock mutual funds,  approximately 39% in Fidelity
bond mutual funds, and approximately 6% in Fidelity money market mutual funds.

                                       20

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

1.  Description of Plan, Continued:

          The  Fidelity  Freedom  2020 Fund seeks high total  returns  for those
planning  to  retire  in  approximately   20-30  years.  It  initially   invests
approximately  74% in  Fidelity  stock  mutual  funds and  approximately  26% in
Fidelity bond mutual funds.

          The  Fidelity  Freedom  2030 Fund seeks high total  returns  for those
planning  to  retire  in  approximately   30-40  years.  It  initially   invests
approximately  83% in  Fidelity  stock  mutual  funds and  approximately  17% in
Fidelity bond mutual funds.

          The PIMCO Total Return Fund (Administrative Class) is an income mutual
fund.  Its strategy is to provide  high total  return that exceeds  general bond
market indices by investing in all types of bonds,  including  U.S.  government,
corporate,  mortgage and foreign.  While the Fund maintains an average portfolio
duration of 3 to 6 years  (approximately equal to an average maturity of 5 to 12
years),  investments may also include short-and long maturity bonds. PIMCO Total
Return Fund is managed by Pacific Investment  Management Company and distributed
by PIMCO Advisors Distribution Company.

          The MAS High Yield Portfolio  (Advisor  Class) is an  income-producing
corporate bond mutual fund. It tries to provide above-average total returns from
both income and price  appreciation  by  investing  primarily  in  high-yielding
corporate bonds that are primarily below  investment  grade. As a result,  these
bonds have higher yields in return for added risk. The fund is managed by Miller
Anderson & Sherrerd, LLP.

          The Morgan Stanley Dean Witter Institutional Fund, Inc.- International
Equity  Portfolio  (Class A) is a  growth-oriented  mutual fund that  invests in
stocks of companies domiciled outside the U.S. It tries to increase the value of
investments over the long term through growth of capital by investing  primarily
in equity securities of companies  domiciled in developed markets outside of the
United  States.  The fund is managed by Morgan  Stanley  Dean Witter  Investment
Management Inc.

          d. Participant Loans. A participant may, upon application, borrow from
the Plan. Only one loan is permitted to a participant in any calendar year (with
a maximum of five loans  outstanding at any time) and the loan shall not be less
than $1,000.  The aggregate amount of all outstanding loans to a participant may
not exceed the lesser of (i) 50% of a  participant's  vested balance in the Plan
or (ii) $50,000 minus the excess of the highest outstanding balance of all loans
from the Plan to the  participant  during the previous  12-month period over the
outstanding balance of all loans from the Plan to the participant on the day the
loan is made. Each loan will bear interest at the rate established

                                       21

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

1.  Description of Plan, Continued:

by the Plan  Committee.  No lump-sum or installment  distribution  from the Plan
will be made to a participant  who has received a loan,  or to a beneficiary  of
any such participant, until the loan, including interest, has been repaid out of
the funds otherwise distributable.

          e. Vesting and Forfeiture of Participants'  Accounts.  A participant's
After-Tax Contributions Account,  Before-Tax  Contributions Account and Rollover
Account are fully vested at all times.

          f.  Withdrawals by  Participants  While  Employed.  A participant  may
withdraw up to the entire balance of the participant's  After-Tax  Contributions
Account once each calendar year. After making such a withdrawal, the participant
must wait six months before making a new election to resume contributions to the
Plan. A  participant  may also  withdraw up to an amount equal to the balance in
his Rollover Account.

          A participant may make withdrawals from the  participant's  Before-Tax
Contributions,  but only if the participant has attained age 59-1/2 or, prior to
that age, only in an amount required to alleviate  financial hardship as defined
in the Code and regulations  thereunder.  Financial hardship  withdrawals from a
Before-Tax  Contributions  Account  suspend  the  participant's  right  to  make
contributions to the Plan for twelve months.

          While any loan to the  participant  remains  outstanding,  the  amount
available for  withdrawal  shall be the balance in such Account less the balance
of all outstanding loans.

          g. Distributions  upon Termination of Employment.  Upon termination of
employment, retirement, total disability or death of a participant, distribution
of the balances of the participant's After-Tax Contributions Account, Before-Tax
Contributions  Account,  Rollover Account and the vested portion of the Employer
Matching  Contributions  Account is made to the  participant or, in the event of
the  participant's  death,  to  the  participant's   designated  beneficiary  or
beneficiaries. Such distribution will be made, as elected by the participant, in
the  form  of  either  a  lump-sum  payment  or in  substantially  equal  annual
installments  over a period  not  exceeding  the  lesser of 15 years or the life
expectancy of the participant or beneficiary,  as the case may be. A participant
may elect to defer distributions until age 70-1/2.

                                       22

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

2.  Summary of Significant Accounting Policies:

          a.  General.  The Plan follows the accrual  method of  accounting  for
recording   contributions   from   participants   and  Employers,   income  from
investments, purchases and sales of investments, and administrative expenses.

          b. Use of  Estimates.  The  preparation  of  financial  statements  in
conformity  with  generally  accepted  accounting  principles  requires the plan
administrator  to make estimates and  assumptions  that affect certain  reported
amounts  and  disclosures.  Accordingly,  actual  results  may differ from those
estimates.

          c. Investment Valuation and Income Recognition.  Guaranteed investment
contracts are fully benefit responsive and are reported at contract value, which
is cost plus accrued  interest;  for synthetic  investment  contracts,  contract
value is equal to the fair value of the collateral  plus the benefit  responsive
wrap value.

          Investments  in Exelon  Corporation  Common  Stock  are  valued at the
closing sales price as reported on New York Stock Exchange.

          Short-term  investments  held by  various  institutional  funds of the
Brinson Trust are stated at cost which approximates  current value.  Investments
in certain of the various funds that make up the Brinson  Multi-Asset  Portfolio
are valued at the latest  reported  sale  price on the  valuation  date used for
securities  traded on United  States and foreign  stock  exchanges.  Investments
valued in foreign  currencies  are converted  into U.S.  dollars based on quoted
foreign  exchange  rates on the valuation  date.  Securities  not listed on such
exchanges or for which no sale has been  reported on that date are valued at the
latest quoted bid price or at estimated  current value as determined by the fund
trustee.

          Investments  of  registered  securities  are  valued  at the last sale
price,  or if no sale  price,  at the closing  bid price.  Securities  for which
exchange  quotations  are not  readily  available  (and in  certain  cases  debt
securities   which   trade  on  an   exchange)   are  valued   primarily   using
dealer-supplied  valuations  or at their fair value as  determined in good faith
under consistently applied procedures under the general supervision of the Board
of Trustees.  Short-term securities maturing within sixty days of their purchase
date are valued at amortized cost or original cost plus accrued  interest,  both
of which approximate current value.

                                       23

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

2.  Summary of Significant Accounting Policies, Continued:

          d. Reclassification. Certain accounts in the 1999 financial statements
have been reclassified for comparative purposes to conform with the presentation
in the 2000 financial statements.  These reclassifications have no effect on the
net assets available for benefits at December 31, 1999.

          e.  New  Accounting  Pronouncements.   In  June  1998,  the  Financial
Accounting   Standards  Board  (FASB)  issued  SFAS  No.  133,  "Accounting  for
Derivative  Instruments  and Hedging  Activities,"  to establish  accounting and
reporting  standards for derivatives.  SFAS No. 133 was subsequently  amended by
SFAS  No.  137 and SFAS No.  138.  The new  standard  requires  recognizing  all
derivatives  as either assets or  liabilities on the balance sheet at their fair
value and specifies the accounting for changes in fair value  depending upon the
intended use of the derivative.  The effective date of SFAS No. 133, as amended,
is for fiscal  year  beginning  after June 15,  2000.  As such,  the Plan is not
required to adopt SFAS No. 133 until January 1, 2001. The Plan's  utilization of
derivative  instruments  for trading or  non-trading  purposes is minimal;  as a
result, the Plan's management  believes the adoption of this Statement will have
no impact on the Plan's financial statements.


3.  Net Appreciation/Depreciation of Investments:

          a. Net Unrealized  Appreciation  or  Depreciation  in Current Value of
Investments.  The net unrealized  appreciation  or  depreciation  in the current
value of  investments  is the  difference in the current value of investments at
the end of the year and the current value of investments at the beginning of the
year less the cost of investments  which were acquired  during the year plus the
current value at the  beginning of the year (or the cost if acquired  during the
year) of assets sold during the year.

          b. Realized Gain or Loss on Investments.  For investments  held at the
beginning  of the year and sold  during the year,  the  difference  between  the
proceeds  received and the current value at the beginning of the year is the net
realized gain or loss on the sale. For investments purchased during the year and
sold during the year, the difference  between the proceeds received and the cost
at the date of purchase is the net realized gain or loss on the sale.

                                       24

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

3.  Net Appreciation/Depreciation of Investments, Continued:

          c. Net  Appreciation/Depreciation  in 2000 and 1999.  During  2000 and
1999, the Plan's  investments  (including gains and losses on investments bought
and sold, as well as held during the year)  appreciated/depreciated  in value as
follows:



                                                   2000                  1999
                                              -------------         -------------
                                                              
Exelon/Unicom Corporation Common Stock        $  49,733,980         $  (7,846,367)
Registered Investment Companies                (121,659,394)          150,577,664
Collective Funds                                 (7,525,056)           40,826,220
                                              -------------         -------------
                                              $ (79,450,470)        $ 183,557,517
                                              =============         =============


4.  Investments:

          The current values of the Plan's  investments at December 31, 2000 and
1999,  which  represent 5% or more of the Plan's net assets,  are  summarized as
follows:



                                                       2000                1999
                                                   ------------        ------------
                                                                 
Brinson Trust Company Collective Investment
     Trusts, Multi-Asset Portfolio Fund            $159,777,555        $185,967,145
Exelon Corporation Common Stock                    $102,220,705        $          -
Fidelity Magellan Fund                             $224,938,176        $269,059,057
Fidelity Growth Company Fund                       $355,738,362        $326,231,146
Fidelity U.S. Equity Index Commingled Pool         $176,333,390        $232,572,225



5.  Investment Contracts:

          In  2000  and   prior   years,   the   Plan   entered   into   several
benefit-responsive  investment  contracts with various  insurance  companies and
other financial institutions.  The contract providers maintain the contributions
in a general  account.  Some  investment  contracts are purchased in conjunction
with the investment by the Plan in fixed-income securities. Investment contracts
provide for the payment of a specified rate of interest. The account is credited
with earnings at the specified rate and charged for participant  withdrawals and
administrative  expenses. The contracts are included in the financial statements
at contract value, as reported to the Plan by the contract  providers.  Contract
value  represents  contributions  made under the contract,  plus earnings,  less
participant  withdrawals and  administrative  expenses.  Plan  participants  may
ordinarily  direct  the  withdrawal  or  transfer  of all or a portion  of their
investment at contract value.

                                       25

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

5.  Investment Contracts, Continued:

         There are no  reserves  against  contract  value for credit risk of the
contract issuer or otherwise.  The weighted average yield for all such contracts
were approximately 5.9 percent and 6.0 percent for 2000 and 1999,  respectively.
The crediting interest rate generally cannot be less than the contract rate.


6.  Investments in Derivative Financial Instruments:

          The Brinson Trust  adheres to strict  guidelines  established  for its
investments  in  derivative  financial  instruments.  The Brinson  Trust  global
investment  process is directed towards weighting market,  currency and security
exposures  to reflect  their  relative  attractiveness.  Exposures  to  markets,
currencies and securities are actively managed to reflect their relative over or
under  pricing.  Once a  strategy  is set and a  decision  made to  establish  a
particular  weighting  in a market,  currency or security  based on  fundamental
analysis,  derivatives  may be used to implement that strategy.  In such a case,
derivatives  are used as a cost  effective  substitute  for direct  purchases or
sales of  assets.  Derivatives  are not used for the  purpose  of  leveraging  a
portfolio.

           The  Multi-Asset  Portfolio  Fund and some of the other Brinson Trust
funds in which it invests  participate in various equity index futures contracts
and foreign currency  contracts.  A futures contract,  is an agreement involving
the delivery of a particular  asset on a specified future date at an agreed upon
price.  Risks of entering into futures  contracts  include the possibility  that
there may be an illiquid  market and that changes in the value of the  contracts
may not correlate with changes in the value of the underlying  securities.  Upon
entering into futures contracts,  the fund is required to deposit either cash or
securities in an amount (initial  margin) based on the number of open contracts.
Open futures  contracts are valued at the settlement price  established each day
on the exchange on which they are traded.  These  contracts are marked to market
daily with the resulting  gain or loss included in the net realized gain or loss
from futures contracts.

          The Multi-Asset  Portfolio Fund enters into various  forward  currency
contracts to manage  exposure to changes in foreign  currency  exchange rates on
its foreign portfolio  holdings.  A forward exchange contract is a commitment to
purchase or sell a foreign  currency at a future  date at a  negotiated  forward
rate. Risks associated with such contracts  include movement in the value of the
foreign currency relative to the U.S. dollar and the ability of the counterparty
to perform.  The contracts are valued at foreign exchange rates, and the changes
in value of open contracts at foreign  exchange rates,  and the changes in value
of open contracts are recognized as unrealized  appreciation/

                                       26


                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements

6.  Investments in Derivative Financial Instruments, Continued:

depreciation. The realized gain or loss on forward currency contracts represents
the difference between the value of the original contracts and the closing value
of such  contracts  and is  included  in net  realized  gain or loss on  forward
currency contracts.

          Similarly,  some or all of the Fidelity  funds and the Morgan  Stanley
Dean  Witter  International  Equity  Portfolio  may  use  (1)  foreign  currency
contracts to facilitate  transactions  in foreign  securities  and to manage the
fund's  currency  exposure  and 2) futures and options  contracts  to manage its
exposure to the stock and bond markets and to fluctuations in the interest rates
and  currency  values.  Such funds also may invest in indexed  securities  whose
values are linked either directly or inversely to changes in foreign currencies,
interest rates, commodities, indices, or other underlying instruments. The funds
use these indexed securities to increase or decrease their exposure to different
underlying  instruments  and to gain exposure to markets that might be difficult
to invest in  through  conventional  securities.  The PIMCO  Total  Return  Fund
(Administrative  Class) may use derivative  instruments,  consisting of futures,
options,  options on futures,  and swap  agreements,  for hedging purposes or as
part of its investment strategies.  The MAS High Yield Portfolio (Advisor Class)
will use derivatives  only in  circumstances  where they offer the most economic
means of improving the risk/reward profile of the portfolio.


7.  Income Tax Status:

          The Internal Revenue Service ("IRS") has issued a determination letter
that the Plan, as amended and restated  January 1, 1995, is a qualified  defined
contribution  plan under Section 401(a) of the Code and qualifies as an employee
stock ownership  plan, that the cash or deferred  arrangement is qualified under
Section  401(k)  of the  Code,  and  that  the  Trust,  as in  effect  as of the
amendments of January 1, 1995, is a qualified  trust exempt from federal  income
tax under Section  501(a) of the Code.  Although the Plan has been amended since
receiving the  determination  letter,  the Plan's tax counsel  believes that the
Plan continues to be in compliance with the applicable  requirements of the Code
for qualified status.


                                       27

                          COMMONWEALTH EDISON EMPLOYEE
                           SAVINGS AND INVESTMENT PLAN

                          Notes to Financial Statements


8.  Plan Amendments:

          Effective  May 3, 1999 the Plan was amended to provide that  dividends
from the Unicom  Corporation  Common Stock Fund payable to a participant  who is
not an employee would be reinvested in the Unicom  Corporation Common Stock Fund
of the participant if the amount of the dividend was $10 or less.

          Effective  April 1,  2000 the plan was  amended  to 1)  incorporate  a
special matching  contribution rate for employees of Unicom Mechanical Services,
Inc. or any or its  subsidiaries  which have  adopted  the Plan 2) exclude  from
eligibility for matching contributions certain "part-time regular employees" who
were members of IBEW Local 15.


9.  Plan Termination:

          The Plan may be amended,  modified or terminated by the Company at any
time,  subject to certain  rights of  participants  under the Plan. The Plan may
also be terminated if the Plan is  disqualified  by the IRS.  Termination of the
Plan with respect to a participating employer may occur if there is no successor
employer in the event of dissolution, merger, consolidation or reorganization of
such employer company.  In the event of full or partial termination of the Plan,
assets of affected  participants of the terminating  employer or employers shall
remain 100% vested and  distributable  at fair market value in the form of cash,
securities or annuity contracts, in accordance with the provisions of the Plan.


10.  Subsequent Events:

          Effective January 1, 2001 Exelon Corporation became the sponsor of the
Plan. On March 30, 2001, the PECO Energy  Employee  Savings Plan was merged into
the Plan and the  Plan  was  amended  and  restated  as the  Exelon  Corporation
Employee Savings Plan.


                                       28



                                                   COMMONWEALTH EDISON EMPLOYEE
                                                   SAVINGS AND INVESTMENT PLAN

                                         Schedule of Assets Held for Investment Purposes
                                                     as of December 31, 2000
                                             Schedule H, Part IV, Item 4i, Form 5500


   No of Shares or                                                                                                 Current
    No. of Units                     Description                                          Cost                      Value
 -------------------    --------------------------------------------------       ----------------------     --------------------
                                                                                                    

                                      COMMON STOCKS
                                      -------------

*  1,455,928 shares     Exelon Corporation Common Stock                                 $ 64,446,249             $ 102,220,705
                                                                                     ---------------           ---------------

                                     COLLECTIVE FUNDS
                                     ----------------

*    147,841 units      Brinson Trust Company Collective Investment
                             Trusts, Multi-Asset Portfolio Fund                         $ 96,361,006             $ 159,777,555
*  4,602,803 units      Fidelity U.S. Equity Index Commingled Pool                       114,929,111               176,333,390
*  7,919,204 units      Fidelity Institutional Cash Portfolio                              7,919,204                 7,919,204
                                                                                     ---------------           ---------------
                                                                                       $ 219,209,321             $ 344,030,149
                                                                                     ---------------           ---------------

                              REGISTERED INVESTMENT COMPANIES
                              -------------------------------

*  1,885,483 shares     Fidelity Magellan Fund                                         $ 198,101,037             $ 224,938,176
*  4,980,237 shares     Fidelity Growth Company Fund                                     318,654,010               355,738,362
*  4,023,394 shares     Fidelity Intermediate Bond Fund                                   40,065,662                40,394,874
*  3,106,250 shares     Fidelity Asset Manager                                            52,147,582                52,247,123
*    373,951 shares     PIMCO Total Return Fund (Administrative Class)                     3,857,069                 3,885,355
*  1,997,151 shares     Morgan Stanley International Equity Portfolio A                   37,867,096                35,709,064
*    234,360 shares     MAS High Yield Portfolio (Advisor Class)                           2,043,279                 1,588,963
*  1,340,060 shares     Fidelity Fund                                                     48,619,697                43,900,367
*  1,168,478 shares     Fidelity Puritan Fund                                             22,497,581                22,002,440
*    712,662 shares     Fidelity Low-Priced Stock Fund                                    16,809,853                16,476,743
*        305 shares     Fidelity Retirement Money Market                                         305                       305
*  1,966,663 shares     Fidelity Dividend Growth Fund                                     56,074,143                58,921,223
*    119,266 shares     Fidelity Freedom Income Fund                                       1,339,364                 1,332,196
*    293,813 shares     Fidelity Freedom 2000 Fund                                         3,664,278                 3,469,936
*    751,796 shares     Fidelity Freedom 2010 Fund                                        10,477,996                10,404,857
*    524,134 shares     Fidelity Freedom 2020 Fund                                         7,953,889                 7,631,387
*    592,523 shares     Fidelity Freedom 2030 Fund                                         9,495,417                 8,887,848
                                                                                     ---------------           ---------------
                                                                                       $ 829,668,258             $ 887,529,219
                                                                                     ---------------           ---------------

                                                                29




                                                   COMMONWEALTH EDISON EMPLOYEE
                                                   SAVINGS AND INVESTMENT PLAN

                                         Schedule of Assets Held for Investment Purposes
                                                     as of December 31, 2000
                                             Schedule H, Part IV, Item 4i, Form 5500

   No of Shares or                                                                                                    Current
    No. of Units                     Description                                             Cost                      Value
 -------------------    --------------------------------------------------          ----------------------     --------------------
                                                                                                    

                                      GUARANTEED INVESTMENT CONTRACTS
                                      -------------------------------

                           CDC Capital
                                Guaranteed Investment Contract
      2,507,855 units           5.62% , Matures 12-10-2003                                   2,507,855                 2,507,855

                           John Hancock Mutual Life Insurance Company
                                Group Annuity Contract
      8,208,349 units           5.30%, Matures 01-31-2001                                    8,208,349                 8,208,349

                           Protective Life Insurance Company
                                Group Annuity Contract
      4,211,340 units           7.23%, Matures 04-11-2001                                    4,211,340                 4,211,340

                           Sun Life Assurance Company of Canada
                                Guaranteed Investment Contract
      5,407,180 units           7.05%, Maturing 07-26-2001                                   5,407,180                 5,407,180

                           AIG Financial Products
                              Synthetic Investment Contract (Asset Backed)
      1,509,725 units         Green Tree Mfd. Housing 1998-3 A5, 6.24%, Matures 11-01-2005   1,509,725                 1,509,725

                           Chase Manhattan
                              Synthetic Investment Contracts (Asset Backed)
      3,039,035 units         Americredit 1999-A A4 5.28%, Matures 12-05-2003                3,039,035                 3,039,035
      2,400,681 units         CMAC 1998-C2 A1 5.41% , Matures 08-15-2005                     2,400,681                 2,400,681
      3,030,781 units         Dayton Hudson Master Trust 1998-1 A, 5.58%,
                                Matures 07-25-2003                                           3,030,781                 3,030,781
      2,498,544 units         General Electric MTN 6.29%,  Matures 11-18-2002                2,498,544                 2,498,544
      3,756,378 units         National Westminster BC 7.22%, Matures 11-17-2003              3,756,378                 3,756,378

                                                               30





                                                   COMMONWEALTH EDISON EMPLOYEE
                                                   SAVINGS AND INVESTMENT PLAN

                                         Schedule of Assets Held for Investment Purposes
                                                     as of December 31, 2000
                                             Schedule H, Part IV, Item 4i, Form 5500

   No of Shares or                                                                                                        Current
    No. of Units                     Description                                                     Cost                  Value
 -------------------    --------------------------------------------------                    ----------------------  --------------
                                                                                                              
                          Deutsche Bank
                             Synthetic Investment Contracts (Asset Backed)
     6,443,797 units           FHLMC 1626-PH  7.13%,  Matures 11-15-2002                             6,443,797          6,443,797
     1,319,612 units           FHR 1522 HB  5.86%,  Matures 03-15-2004                               1,319,612          1,319,612
     3,532,328 units           GMAC CARAT 99-1 (A3), 5.11%, Matures 06-17-2002                       3,532,328          3,532,328

                          Monumental Life Insurance Company
                             Synthetic Investment Contracts (Asset Backed)
     2,212,477 units           Chase Manhattan Auto Tr. 1998-B A4, 5.61%, Matures 08-15-2002         2,212,477          2,212,477
     3,519,664 units           Chase Manhattan Auto Tr. 1997-B A5, 5.99%, Matures 10-15-2001         3,519,664          3,519,664
     3,004,149 units         First USA Credit Card 1998-9 A, 5.34%, Matures 01-19-2004               3,004,149          3,004,149
     1,014,032 units           FN93 1992-E .90%,  Matures 11-25-2002                                 1,014,032          1,014,032
     1,883,744 units           FN93 1993-210 5.73%,  Matures 11-25-2002                              1,883,744          1,883,744
     1,517,178 units         PHMS 1993-48 A3 6.31%, Matures 09-25-2003                               1,517,178          1,517,178
     2,193,573 units         Sears Credit Account Master Trust 1996-1 A, 6.27%, Matures 03-15-2002   2,193,573          2,193,573

                          Morgan Guaranty
                             Synthetic Investment Contracts (Asset Backed)
     3,529,375 units           CIT Marine 99-A A3, 5.72%, Matures 08-15-2005                         3,529,375          3,529,375
     1,887,006 units           FH 1388 H 5.64%, Matures 10-17-2005                                   1,887,006          1,887,006
     3,046,007 units           FH 1601 PH 5.58%, Matures 10-17-2005                                  3,046,007          3,046,007
     2,396,493 units           FH 1712-PG 6.48%, Matures 09-16-2002                                  2,396,493          2,396,493
     3,504,684 units           FHR 1587 L 6.68%, Matures 07-15-2004                                  3,504,684          3,504,684
     3,499,909 units         JC Penney Master Trust E A, 5.65%, Matures 11-17-2003                   3,499,909          3,499,909

                          Rabo Bank
                             Synthetic Investment Contracts (Asset Backed)
     3,047,155 units           FH 1798 A 5.67%, Matures 11-15-2006                                   3,047,155          3,047,155

                                                               31




                                                   COMMONWEALTH EDISON EMPLOYEE
                                                   SAVINGS AND INVESTMENT PLAN

                                         Schedule of Assets Held for Investment Purposes
                                                     as of December 31, 2000
                                             Schedule H, Part IV, Item 4i, Form 5500

   No of Shares or                                                                                                        Current
    No. of Units                     Description                                                     Cost                  Value
 -------------------    --------------------------------------------------                    ----------------------  --------------
                                                                                                              
                         State Street Bank
                            Synthetic Investment Contracts (Asset Backed)
    1,002,528 units           American Express Master Trust 1998-1 A, 5.97%, Matures 05-15-2003      1,002,528           1,002,528
      560,191 units           Capital Equipment Trust 1997-1 A4, 5.27%, Matures 09-17-2001             560,191             560,191
    2,033,509 units           Discover Card Master Trust 1998-2 A, 5.98%, Matures 03-15-2001         2,033,509           2,033,509
    2,263,405 units           FHR 1661 PG 5.71%, Matures 04-15-2003                                  2,263,405           2,263,405
    3,014,965 units           NEWCOURT 1998-2 (A4), 5.01%, Matures 02-18-2003                        3,014,965           3,014,965
    3,010,986 units           Premier Auto Trust 1998-4, 5.85%, Matures 07-08-2002                   3,010,986           3,010,986

                         UBS AG
                            Synthetic Investment Contracts (Asset Backed)
    2,006,466 units           Arcadia Auto Trust 1998-A A5, 6.10%, Matures 10-15-2003                2,006,466           2,006,466
    3,034,693 units           CARCO 1999-1 A2, 5.06%, Matures 03-15-2002                             3,034,693           3,034,693
    3,506,890 units           Key Auto 1999-1 (A4), 5.95%, Matures 03-15-2004                        3,506,890           3,506,890
    4,114,852 units           MBNA 97-1 (A), 5.84%, Matures 08-16-2004                               4,114,852           4,114,852
    3,059,404 units           Prime Credit Card Trust 1995-1 A, 5.73%, Matures 08-15-2002            3,059,404           3,059,404

                         Westdeutsche Landesbank
                            Synthetic Investment Contract (Asset Backed)
    4,004,014 units           American Express 99-1 A, 5.71%, Matures 04-15-2004                     4,004,014           4,004,014
    3,734,321 units           MSC 1999-CAM1 A2 6.87%, Matures 11-17-2008                             3,734,321           3,734,321


                         CDC Capital
   13,792,778 units         Synthetic Investment Contracts (Global Wrap) 7.23%                      13,792,778          13,792,778

                         Chase Manhattan
   13,795,874 units         Synthetic Investment Contracts (Global Wrap) 7.23%                      13,795,874          13,795,874

                                                               32




                                                   COMMONWEALTH EDISON EMPLOYEE
                                                   SAVINGS AND INVESTMENT PLAN

                                         Schedule of Assets Held for Investment Purposes
                                                     as of December 31, 2000
                                             Schedule H, Part IV, Item 4i, Form 5500

   No of Shares or                                                                                                     Current
    No. of Units                     Description                                                     Cost               Value
 -------------------    --------------------------------------------------                    -----------------  ------------------
                                                                                                          
                       Manumental Life Insurance
 13,794,760 units         Synthetic Investment Contracts (Global Wrap) 7.23%                        13,794,760          13,794,760

                       Westdeutsche Landesbank
 13,794,808 units         Synthetic Investment Contract (Global Wrap) 7.23%                         13,794,808          13,794,808
                                                                                              -----------------   -----------------
                                                                                               $   174,645,495     $   174,645,495
                                                                                              -----------------   -----------------

                                                            LOANS
                                                            -----

                       Participant Loans ( 8.50% - 10.50%)                                     $            --     $    46,322,514
                                                                                              -----------------   -----------------

                       Total Investments                                                       $ 1,287,969,323     $ 1,554,748,082
                                                                                              =================   =================

   * A party-in-interest to the Plan.

                                                               33




                                List of Exhibits


Exhibit No.        Description
-----------        -----------

                   PECO Energy Company Employee Savings Plan
                   -----------------------------------------
23.1               Consent of Independent Auditors
23.2               Consent of Independent Accountants


                   Commonwealth Edison Employee Savings and Investment Plan
                   --------------------------------------------------------
23.3               Consent of Independent Public Accountants









                                       34


                                   Signatures


          Pursuant to the  requirements of the Securities  Exchange Act of 1934,
the trustees (or other persons who  administer  the employee  benefit plan) have
duly  caused this  annual  report to be signed on its behalf by the  undersigned
hereunto duly authorized.


Date: June 29, 2001     PECO Energy Company Employee Savings Plan
                        Commonwealth Edison Employee Savings and Investment Plan


                        /s/ Ruth Ann M. Gillis
                        ------------------------------
                        Ruth Ann M. Gillis
                        Chairman, Plan Committee

















                                       35