UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 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, 2003


                                       OR


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


                         Commission File Number 1-16169


                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN
                            (Full title of the Plan)



                               EXELON CORPORATION
                          (a Pennsylvania Corporation)
                      10 South Dearborn Street - 37th Floor
                                 P.O. Box 805379
                          Chicago, Illinois 60680-5379
                                 (312) 394-7398


             (Name of the issuer of the securities held pursuant to
          the Plan and the address of its principal executive offices)











                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN
                    ----------------------------------------

                               INDEX TO FORM 11-K
                               ------------------

                                                                                         
                                                                                        Page No.
                                                                                        ---------

Report Of Independent Registered Public Accounting Firm                                     1


Financial Statements:

     Statements of Net Assets Available for Benefits
         as of December 31, 2003 and 2002                                                   2


     Statement of Changes in Net Assets Available for Benefits
         for the Year Ended December 31, 2003                                               3


Notes to Financial Statements                                                               4

Supplemental Schedules:

     Schedule of Assets (Held at End of Year) as of
        December 31, 2003, Schedule H, Part IV, Item 4i of Form 5500                       14


      Note:    All other schedules of additional information required by the
               Department of Labor's Rules and Regulations for Reporting and
               Disclosure under ERISA have been omitted because they are not
               applicable.


Exhibit Index                                                                              16

Signatures                                                                                 17

Exhibits                                                                                   18










             REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
            --------------------------------------------------------

To the Exelon Corporation
   Employee Savings Plan Committee

We have audited the accompanying statements of net assets available for benefits
of the Exelon  Corporation  Employee  Savings  Plan as of December  31, 2003 and
2002, and the related  statement of changes in net assets available for benefits
for the year  ended  December  31,  2003.  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  auditing  standards of the Public
Company Accounting Oversight Board (United States). 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 Exelon
Corporation  Employee  Savings  Plan as of December  31, 2003 and 2002,  and the
changes in net assets  available  for benefits  for the year ended  December 31,
2003, in conformity with accounting  principles generally accepted in the United
States of America.

Our  audits  were  made for the  purpose  of  forming  an  opinion  on the basic
financial statements taken as a whole. The supplemental  schedule of assets held
at end of year as of December 31, 2003,  is presented for purposes of additional
analysis and is not a required  part of the basic  financial  statements  but is
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.   This   supplemental   schedule  is  the
responsibility  of the Plan's  management.  The  supplemental  schedule has been
subjected  to the  auditing  procedures  applied  in  the  audits  of the  basic
financial  statements  and, in our opinion,  is fairly  stated,  in all material
respects, in relation to the basic financial statements taken as a whole.



                                          WASHINGTON, PITTMAN & McKEEVER, LLC
Chicago, Illinois
June 11, 2004







                                     EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                                  STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS

                                         AS OF DECEMBER 31, 2003 AND 2002

                                                                                           
                                                                            2003                           2002
                                                                  -----------------------       --------------------------
ASSETS

INVESTMENTS
   Investments at Current Value:
          Exelon Corporation Common Stock                          $         143,161,613         $            119,920,775
          Registered Investment Companies                                  1,521,547,024                    1,110,218,146
          Collective Investment Trust Funds                                  699,958,457                      551,281,035
          Participant Loans                                                   60,979,282                       60,712,146
                                                                  -----------------------       --------------------------
                                                                           2,425,646,376                    1,842,132,102
          Investment Contracts at Contract Value                              23,071,802                       97,216,780
                                                                  -----------------------       --------------------------
                           Total Investments                               2,448,718,178                    1,939,348,882
                                                                  -----------------------       --------------------------


CASH                                                                           1,423,621                        3,057,853

RECEIVABLES:
     Accrued Dividends and Interest                                                  695                            2,192
     Accrued Contributions                                                     3,107,551                                -
     Other Receivables                                                         1,299,881                          210,731
                                                                  -----------------------       --------------------------
                           Total Receivables                                   4,408,127                          212,923
                                                                  -----------------------       --------------------------

          TOTAL ASSETS                                                     2,454,549,926                    1,942,619,658
                                                                  -----------------------       --------------------------

LIABILITIES

     Due to Broker for Securities Purchased                                            -                          790,862
     Accrued Administrative Expenses and Other
          Liabilities                                                          1,166,059                          594,014
                                                                  -----------------------       --------------------------
          TOTAL LIABILITIES                                                    1,166,059                        1,384,876
                                                                  -----------------------       --------------------------

NET ASSETS AVAILABLE FOR BENEFITS                                  $       2,453,383,867         $          1,941,234,782
                                                                  =======================       ==========================



The accompanying Notes are an integral part of the Financial Statements.








                                        2










                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

            STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS

                      FOR THE YEAR ENDED DECEMBER 31, 2003


                                                                                  
                                                                                            2003
                                                                                     -------------------
ADDITIONS TO NET ASSETS ATTRIBUTABLE TO:

INVESTMENT INCOME:
     Dividends on Exelon Corporation Common Stock                                    $        4,482,709
     Income from Registered Investment Companies and
          Collective Investment Trust Funds                                                  35,791,902
     Income from Participant Loans                                                            4,244,591
     Net Appreciation of Investments                                                        436,145,345
                                                                                     -------------------

     Total Investment Income                                                                480,664,547
                                                                                     -------------------


CONTRIBUTIONS:
     Participants                                                                           104,313,639
     Employers                                                                               56,510,411
     Rollovers                                                                                4,941,961
                                                                                     -------------------

     Total Contributions                                                                    165,766,011
                                                                                     -------------------

             TOTAL ADDITIONS                                                                646,430,558
                                                                                     -------------------


DEDUCTIONS FROM NET ASSETS ATTRIBUTABLE TO:

WITHDRAWALS BY PARTICIPANTS                                                                 128,735,825
DIVIDEND DISTRIBUTIONS                                                                        4,482,686
ADMINISTRATIVE EXPENSES                                                                       1,057,091
                                                                                     -------------------

             TOTAL DEDUCTIONS                                                               134,275,602
                                                                                     -------------------

NET INCREASE BEFORE TRANSFERS                                                               512,154,956
NET ASSETS TRANSFERRED FROM OTHER PLANS                                                          13,045
NET ASSETS TRANSFERRED TO OTHER PLANS                                                           (18,916)
                                                                                     -------------------
NET INCREASE AFTER TRANSFERS                                                                512,149,085

NET ASSETS AVAILABLE FOR BENEFITS:

             BEGINNING OF YEAR                                                            1,941,234,782
                                                                                     -------------------

             END OF YEAR                                                             $    2,453,383,867
                                                                                     ===================





The accompanying Notes are an integral part of the Financial Statements.




                                        3





                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                          NOTES TO FINANCIAL STATEMENTS

(1)  Description  of Plan. The following  description of the Exelon  Corporation
Employee Savings 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,  effective  March 1, 1983, to provide a systematic  savings program for
eligible  employees and to supplement such savings with employer  contributions.
On March 30, 2001 the  Commonwealth  Edison Employee Savings and Investment Plan
was combined with the PECO Energy  Company  Employee  Savings Plan to become the
Exelon Corporation  Employee Savings Plan. 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 Exelon  Corporation
(the  "Corporation")  and any other affiliated company that adopts the Plan (the
"Companies")  with  the  consent  of the  Corporation  is  eligible  to elect to
participate in the Plan.  There were 25,805 and 23,872  participants in the Plan
at December 31, 2003 and 2002, respectively.

              The  Corporation  is the  sponsor  and  administrator  of the Plan
("Plan  Administrator") 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  Exelon  Corporation  Employee  Savings  Plan trust (the
"Trust').   The  plan   committee   has  the   responsibility   for   day-to-day
administration  of the  Plan.  Fidelity  Management  Trust  Company  is the Plan
trustee ("Trustee") and Fidelity Investments  Institutional  Operations Company,
Inc. is the Plan recordkeeper.

              b.  Contributions.  The Plan permits salaried and non-union hourly
employees  to  contribute  between 1% and 20% of their  normal base pay each pay
period on a pre-tax basis,  an after-tax  basis or a combination of the two. For
Exelon  subsidiaries  that have adopted the Plan on behalf of their salaried and
non-union hourly employees,  the Companies match contributions at a rate of 100%
of the first 5% of contributions (whether pre-tax or after-tax).

              The Plan permits union-represented employees to contribute between
1% and 15% of the sum of  their  normal  base  pay plus  certain  overtime  on a
pre-tax  basis and between 1% and 10% on an after-tax  basis.  Although the Plan
permits  contributions of up to 15% of base pay on a pre-tax basis and up to 10%
of base pay on an after-tax basis,  the combined maximum employee  contributions
may not exceed 20%. For  subsidiaries of the  Corporation  that have adopted the
Plan on behalf of their union employees,  the Companies match contributions at a
rate of 100% of the first 2%  contributed,  84% of the following 1% contributed,
83% of the following 2% contributed, and 25% of the following 1% contributed.

              Effective  August 1,  2002,  during any  calendar  year in which a
participant  attains  age 50 or older,  he or she may  elect to make  additional
pre-tax contributions,  called "catch-up" contributions to the Plan. In order to
be eligible to make catch-up contributions, the participant must anticipate that
his or her pre-tax  contributions  to the Plan will reach the applicable  annual
Internal  Revenue  Service  ("IRS")  limit on that  type of  contribution  or be
contributing at the maximum base pay level.



                                       4


                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)



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

              The Exelon  Corporation  Stock Fund seeks to increase the value of
each account over the long term by investing in Exelon  Corporation common stock
and short-term  investments.  The amount of the short-term  investments is based
upon a  target  established  by the  plan  sponsor,  but the  actual  amount  of
short-term  investments  on any given  business day will vary with the amount of
cash awaiting  investment and participant  activity of the fund  (contributions,
redemptions, exchanges and withdrawals).

              The UBS  Diversified  Fund - Class A is a  global  balanced  asset
allocation  collective  fund.  The fund is a broadly  diversified  portfolio  of
stocks,  bonds, real estate and private market  investments in the United States
and a broad range of other  countries,  including a small allocation in emerging
markets.  The fund is invested in the Multi-Asset  Portfolio offered through UBS
Global Asset Management Trust Company and UBS Global Asset Management.  The fund
is actively  managed within an asset  allocation  framework that encompasses the
full range of market,  currency and security  exposures within the world capital
markets.

              The  Managed  Income  Fund  is a fund  that  is a  combination  of
Fidelity's  Managed  Income  Portfolio  II ("MIP II") and  investment  contracts
previously  purchased by the Plan. The MIP II is managed by the Trustee. The MIP
II invests in  investment  contracts  offered by major  insurance  companies and
other  approved  financial  institutions  and in certain  types of fixed  income
securities.  A small  portion of MIP II is  invested  in a money  market fund to
provide daily  liquidity.  Other  investment  contracts  ("wrap  contracts") are
purchased  in  conjunction  with  an  investment  in  MIP  II  in  fixed  income
securities,  which may include United States  treasury bonds,  corporate  bonds,
mortgage-backed securities and bond funds.

              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  Low-Priced  Stock Fund is a growth  mutual fund.  It
seeks capital  appreciation  and invests  mainly in U.S. and foreign  low-priced
stocks  that  may  be  undervalued,  overlooked  or  out  of  favor.  Generally,
"low-priced"  is  considered  $35 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 that invest
in a collection of


                                       5



                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


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 a  participant's  retirement.  For the funds with a target
retirement  date,  the  mix of  underlying  funds  will  gradually  become  more
conservative over time.

              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
who retired  around 2000.  It initially  invests  approximately  23% in Fidelity
stock  mutual  funds,  approximately  40% in  Fidelity  bond  mutual  funds  and
approximately 37% in Fidelity money market mutual funds.

              The Fidelity  Freedom 2010 Fund seeks high total returns for those
planning to retire  around  2010.  It  initially  invests  approximately  45% in
Fidelity stock mutual funds, approximately 45% in Fidelity bond mutual funds and
approximately 10% in Fidelity money market mutual funds.

              The Fidelity  Freedom 2020 Fund seeks high total returns for those
planning to retire  around  2020.  It  initially  invests  approximately  70% in
Fidelity stock mutual funds and approximately 30% in Fidelity bond mutual funds.

              The Fidelity  Freedom 2030 Fund seeks high total returns for those
planning to retire  around  2030.  It  initially  invests  approximately  82% in
Fidelity stock mutual funds and approximately 18% in Fidelity bond mutual funds.

              The Fidelity  Freedom 2040 Fund seeks high total returns for those
planning to retire  around  2040.  It  initially  invests  approximately  88% in
Fidelity stock mutual funds and approximately 12% in Fidelity bond mutual funds.

              The  Fidelity  Contrafund  is a growth  mutual  fund that seeks to
provide  capital  appreciation.  The fund invests  primarily in common stocks of
domestic and foreign issuers.  The fund invests in securities of companies whose
value the manager believes is not fully recognized by the public.

              The Morgan Stanley 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  Franklin  Small-Mid  Cap  Growth  Fund - Class A is a  growth
mutual  fund  that  invests  at least  80% of its  total  assets  in the  equity
securities of U.S. small  capitalization  companies and in the equity securities
of U.S. mid capitalization companies. For this fund, mid-cap companies are those
companies with market capitalization values not exceeding $8.5



                                       6


                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


billion and small cap companies are those with market cap values not  exceeding:
1) $1.5 billion;  or 2) the highest  market cap value in the Russell 2000 Index;
whichever is greater, at the time of purchase.

              The Legg Mason Value Trust Institutional Class Fund is a large-cap
equity mutual fund which uses the value approach to investing. This fund invests
in stocks  that the  advisor  believes  are  undervalued  and,  therefore  offer
above-average potential for capital appreciation.

              The PIMCO  Total  Return Fund  (Institutional  Class) is an income
mutual fund with the goal to provide a high total  return that  exceeds  general
bond market  indices.  The fund  invests in all types of bonds,  including  U.S.
government, corporate, mortgage and foreign. While the fund maintains an average
portfolio  duration  of three to six years  (approximately  equal to an  average
maturity  of five to twelve  years),  investments  may also  include  short- and
long-maturity bonds.

              The T. Rowe Price  Capital  Appreciation  Fund is a growth  mutual
fund  that  seeks  to  maximize  long-term  capital  appreciation  by  investing
primarily in equities.  The fund invests primarily in common stocks and the fund
may hold fixed income and other  securities to help preserve  principal value in
uncertain declining markets.  The fund invests primarily in the common stocks of
established U.S. companies believed to have above-average  potential for capital
growth.

              The T. Rowe Price High  Yield Fund is an income  mutual  fund with
the goal to provide high current income and, secondarily,  capital appreciation.
The fund  normally  invests  at least 80% of its total  assets in a  diversified
portfolio of high-yield corporate, or "junk" bonds, income producing convertible
securities and preferred stocks. The dollar-weighted  average maturity generally
is expected to be in the 8 to 12 year range.

              The BGI  Money  Market  I Fund  is a  collective  investment  fund
managed by Barclays'  Global  Investors,  N.A. that invests in  short-term  debt
securities  with high credit  ratings known as money market  instruments.  These
securities are issued by U.S. and foreign corporations,  governments,  banks and
U.S. agencies such as Federal National Mortgage Association and the Student Loan
Marketing  Association.  These  investments  are  considered low risk due to the
financial   strength  of  the  issuers  and  the  short-term   maturity  of  the
investments.

              The BGI Extended  Equity  Market Fund Class K is a fund managed by
Barclays'  Global  Investors,  N.A.  that  invests in small and  mid-sized  U.S.
stocks.  The fund invests in stocks that comprise the BGI Extended  Market Index
("Index").  The fund will invest in these types of investments in  approximately
the  same  proportion  as  the  Index.   The  Index  is  an  unmanaged,   market
capitalization weighted index of approximately 6,500 U.S. equity securities.  It
includes  most of the stocks in the Wilshire  5000 except for those  included in
the S&P 500.

              The  BGI  Equity  Index  Fund  Class  T is  a  growth  and  income
commingled  fund managed by Barclays'  Global  Investors,  N.A. The fund invests
primarily in the broadly  diversified  common stocks of the 500  companies  that
make up the S&P 500. The fund holds each stock in the same  proportion  in which
it is represented in the index,  which means it is weighted by stock price times
shares  outstanding.  Stocks are selected based on the  composition of the index
rather than  according to  subjective  opinions  about  individual



                                       7



                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


companies or industries.

              The BGI  EAFE  Equity  Index  Fund  Class K is a fund  managed  by
Barclays' Global Investors, N.A, that invests in stocks that comprise the Morgan
Stanley Capital International in the EAFE (Europe, Australasia, Far East) Index.
The fund will invest in these types of  investments  in  approximately  the same
proportion as the EAFE Index. The EAFE Index is an unmanaged index  representing
over 1,000 companies within 20 developed countries.

              BGI U.S.  Debt Index Fund Class K is a fund  managed by  Barclays'
Global Investors,  N.A that invests in bonds within the U.S. The fund invests in
investment-grade securities with maturities of at least one year, including U.S.
Treasury  and  U.S.  agency  securities,   corporate  bonds,   asset-backed  and
mortgage-backed  securities.  The fund will invest in these types of investments
in  approximately  the same  proportion as the Lehman  Brothers  Aggregate  Bond
Index.  This  index is a broad  unmanaged  index  that  measures  the  aggregate
performance of the U.S. market for investment-grade bonds.

              d.  Discontinued  Funds.  The Franklin  Small-Mid  Cap Growth Fund
Class A Fund was  discontinued as of April 30, 2003. The assets were transferred
to the various funds described above.

              e. 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 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. For a general purpose loan, the maximum period is five years.  For
a home loan the maximum term is fifteen years and the minimum is five years. The
interest  rate on all loans is the prime rate for  commercial  loans plus 1%. 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.

              f. Vesting of Participants'  Accounts.  A participant's  after-tax
contributions  account,  before-tax  contributions  account,  employer  matching
contributions account and rollover account are fully vested at all times.

              g. 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 or her 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 there under.  Financial hardship
withdrawals from a before-tax  contributions  account suspend the  participant's
right to make contributions to the Plan for six months.




                                       8




                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


              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.

              h. 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  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.  If  the  value  of  a
participant's  account is greater than $5,000,  the participant can leave his or
her account in the plan.  Distributions  will be taxed as ordinary income in the
year withdrawn and may also be subject to an early  withdrawal  penalty if taken
before age 59 1/2, unless  eligible  rollover  distributions  are rolled over to
another  qualified  plan or an  Individual  Retirement  Account  ("IRA").  A 20%
mandatory  federal  income  tax  withholding  applies  to  withdrawals  that are
eligible  for  rollover,  but  which are not  directly  rolled  over to  another
qualified plan or an IRA.

              i.   Administrative   Expenses.    Administrative   expenses   for
recordkeeping  services as well as trustee  services,  which include  custodial,
administrative  and fiduciary  services,  and professional fees, are paid out of
the Plan assets.

              j. Participant  Accounts.  Each participant's  account is credited
with  the  participant's  contribution  and  allocations  of (a) the  Companies'
contribution  and  (b)  Plan  earnings,   and  charged  with  an  allocation  of
administrative  expenses.  Allocations  are based on  participant  elections  or
account balances,  as defined. The benefit to which a participant is entitled is
the benefit that can be provided from the participant's vested account.

              k. Employee  Stock  Ownership  Plan. If a participant  invests any
portion  of his or her  account  in the  Exelon  Corporation  Stock  Fund and is
eligible to receive dividend distributions from the Plan, then effective January
1,  2002,  the  participant  is deemed  to have  elected  to have the  dividends
reinvested in the Exelon  Corporation Stock fund. If the participant  prefers to
receive any such  dividends in cash,  he or she can so elect by  contacting  the
Plan  recordkeeper.  Dividends  distributed to the  participant in cash from the
Plan are subject to income tax as a dividend,  and  affected  participants  will
receive a IRS Form 1099DIV for the dividends in the year following receipt (Form
1099R if the participant takes a full distribution of his or her Plan account).

(2) Summary of  Significant  Accounting  Policies.  The  significant  accounting
policies followed by the Plan are as follows:

              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.
Benefits are recorded when paid.

              b. Use of Estimates.  The  preparation of financial  statements in
conformity with accounting principles generally accepted in the United States of
America  requires the plan



                                       9



                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


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.  The Plan presents
in the  statement  of changes  in net  assets  available  for  benefits  the net
appreciation in the fair value of its investments which consists of the realized
gain  (loss)  on  the  sale  of  securities  and  the  unrealized   appreciation
(depreciation) in the fair value of investments.

              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
UBS Global Asset Management Trust Company are stated at cost which  approximates
current value.  Investments in certain of the various funds that make up the UBS
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 that date and 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.  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.

              Participant  loans are  valued at cost,  which  approximates  fair
value.

              Purchase  and sales of  securities  are  recorded on a  trade-date
basis. Interest income is recorded on the accrual basis.  Dividends are recorded
on the ex-dividend date.


(3) Net  Appreciation  of  Investments.  During  2003,  the  Plan's  investments
(including  gains and losses on  investments  bought  and sold,  as well as held
during the year appreciated in value as follows:

                                              2003
                                          ------------

Exelon Corporation Common Stock           $ 35,264,788
Registered Investment Companies            329,039,795
Collective Investment Trust Funds           71,840,762
                                          ------------

                                          $436,145,345
                                          ============


                                       10



                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


(4)  Investments.  The current values of the Plan's  investments at December 31,
2003  and  2002,  which  represent  5% or more of the  Plan's  net  assets,  are
summarized as follows:

                                                    2003               2002
                                                ------------      ------------
Fidelity Managed Income Portfolio II            $300,752,415      $224,024,411
UBS Diversified Fund - Class A                   194,981,484       155,999,960
Exelon Corporation Common Stock                  143,161,613       119,920,775
Fidelity Magellan Fund                           183,297,372       143,155,225
Fidelity Growth Company Fund                     276,686,964       166,097,506
BGI Equity Index T Fund                          142,983,724       112,827,032
Fidelity Dividend Growth Fund                    141,585,850       112,395,883
Legg Mason Value Trust Institutional Class       289,137,889       188,387,040
Fidelity Contrafund                              167,393,817       128,875,927
PIMCO Total Return Fund - Inst. Class *          105,309,204        98,193,027

* - The PIMCO Total Return Fund - Inst.  Class asset  balance as of December 31,
2003 was less than 5% of the Plan  assets,  however it is included in this table
because the  December  31, 2002 balance was greater than 5% of Plan assets as of
December 31, 2002.

(5) Investment Contracts. In 2003 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.

              There are no reserves  against  contract  value for credit risk of
the contract  issuer.  The weighted  average yield for all such  contracts  were
approximately 5.0 percent and 5.9 percent for 2003 and 2002,  respectively.  The
crediting  interest rate  generally  cannot be less than the contract  rate. The
fair  market  value of the  investment  contracts  as of  December  31, 2003 was
$23,603,928 and $97,774,437 as of December 31, 2002.

(6)  Investments  in  Derivative  Financial  Instruments.  The  UBS  Multi-Asset
Portfolio Fund and some of the funds in which it invests  participate in various
equity index futures  contracts and foreign  currency  contracts.  The assets of
this fund are invested as follows: 51% equities, 22% bonds, 10% real estate, 11%
derivatives  and  6%  venture  capital.  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.   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.



                                       11




                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)

              A forward foreign 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 are recognized as unrealized  appreciation/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.

              Similarly,  some or all of the Fidelity funds,  the Morgan Stanley
International  Equity  Portfolio and the BGI EAFE Equity Index  Fund-Class K 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.

(7) Risks and Uncertainties. The Plan provides for various investment options in
several investment securities and instruments,  including common stock of Exelon
Corporation.  Investment  securities  are  exposed  to  various  risks,  such as
interest  risk,  market and credit risks.  Due to the level of risks  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 and  values 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.  No  collateral  or other  security is required by the
Trustee to collateralize these financial statements.

(8) Income Tax Status. The IRS has issued a determination  letter that the Plan,
as amended and  restated  December  31, 2003 is a qualified  plan under  Section
401(a) and 401(k) of the Code, and the Trust  established  under the Plan, as in
effect as of the  amendments  of December 31, 2003,  is tax exempt under Section
501(a) of the Code.

(9) Plan  Termination.  The Plan may be amended,  modified or  terminated by the
Corporation  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.  The  Corporation  has no current
intentions of terminating the Plan.

(10) Related Party  Transactions.  Investment options in the Plan include mutual
funds managed by Fidelity  Management  Trust Company,  the Trustee as defined by
the Plan. Also, the Plan holds shares of Exelon  Corporation common stock. These
transactions qualify as exempt party-in-interest  transactions.  There have been
no known prohibited transactions with a party-in-interest.


                                       12



                    EXELON CORPORATION EMPLOYEE SAVINGS PLAN

                    NOTES TO FINANCIAL STATEMENTS (CONCLUDED)


(11)   Subsequent   Events.   Effective   February  25,  2004,  the  net  assets
($95,941,218)  of the AmerGen  Employee  Savings  Plan for TMI and Oyster  Creek
Non-Bargaining  Employees  and the  AmerGen  Employee  Savings  Plan for Clinton
Non-Bargaining Employees were merged into the Plan.

A decision has been made by the Plan  administrator  to discontinue the Fidelity
Magellan Fund as a plan option  effective  December 31, 2004.  This decision has
been communicated to participants of the Plan.

The IRS issued a  determination  letter  dated  June 1,  2004,  that the Plan as
amended and restated as of December 31, 2003 is a qualified  plan under  Section
401(a) and 401(k) of the Code, and the Trust  established  under the Plan, as in
effect as of the  amendments  of December 31, 2003 is tax exempt  under  Section
501(a) of the Code.





                                       13







                                        EXELON CORPORATION EMPLOYEE SAVINGS PLAN
                                        ----------------------------------------
                                        SCHEDULE OF ASSETS (HELD AT END OF YEAR)
                                        ----------------------------------------
                                                 AS OF DECEMBER 31, 2003
                                        ----------------------------------------
                                        Schedule H, Part IV, Item 4i of Form 5500
                                        -----------------------------------------
                               Employer Identification Number 23-2990190, Plan Number 003
                               ----------------------------------------------------------


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

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

  *        5,710,764 shares   Exelon Corporation Common Stock                                                  $ 143,161,613
                                                                                                            -----------------

                                         COLLECTIVE INVESTMENT TRUST FUNDS
                                         ---------------------------------


             138,498 units    UBS Diversified Fund - Class A                                                     194,981,484
           4,379,287 units    BGI Equity Index Fund Class T                                                      142,983,724
             105,247 units    BGI EAFE Equity Index Fund Class K                                                   1,500,825
          46,485,615 shares   BGI Money Market Fund Class I                                                       46,485,615
             196,780 shares   BGI Extended Equity Market Fund Class K                                              5,289,438
             410,776 shares   BGI U.S. Debt Index Fund Class K                                                     7,964,956
  *      300,752,415 units    Fidelity Managed Income Portfolio II                                               300,752,415
                                                                                                            -----------------
                                                                                                                 699,958,457
                                                                                                            -----------------

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

  *        1,875,357 shares   Fidelity Magellan Fund                                                             183,297,372
  *        3,391,972 shares   Fidelity Contrafund                                                                167,393,817
  *        5,526,003 shares   Fidelity Growth Company Fund                                                       276,686,964
  *        3,087,523 shares   Fidelity Low-Priced Stock Fund                                                     108,001,548
  *        5,186,295 shares   Fidelity Dividend Growth Fund                                                      141,585,850
  *          373,977 shares   Fidelity Freedom Income Fund                                                         4,147,404
  *          485,115 shares   Fidelity Freedom 2000 Fund                                                           5,714,655
  *        1,964,300 shares   Fidelity Freedom 2010 Fund                                                          25,575,193
  *        2,701,490 shares   Fidelity Freedom 2020 Fund                                                          35,173,400
  *        1,413,894 shares   Fidelity Freedom 2030 Fund                                                          18,309,929
  *          342,519 shares   Fidelity Freedom 2040 Fund                                                           2,589,444
           9,832,792 shares   PIMCO Total Return Fund (Institutional Class)                                      105,309,204
           5,047,658 shares   T. Rowe Price Capital Appreciation Fund                                             88,334,007
           2,087,115 shares   T. Rowe Price High Yield Fund                                                       14,735,030
           2,914,760 shares   Morgan Stanley International Fund, Inc.-International Equity Portfolio Class A      55,555,318
           4,598,249 shares   Legg Mason Value Trust  Institutional Class Fund                                   289,137,889
                                                                                                            -----------------
                                                                                                               1,521,547,024
                                                                                                            -----------------

                                                INVESTMENT CONTRACTS
                                                --------------------


                              Chase Manhattan
                                 Synthetic Investment Contracts (Asset Backed)
           2,307,121 units    FannieMae GLBL, 4.69%, Matures 03-15-2004                                            2,307,121


                              Monumental Life Insurance Company
                                 Synthetic Investment Contracts (Asset Backed)
             102,641 units         FHR 1522 HB 5.91%,  Matures 3-15-2004                                             102,641
           3,004,931 units         FUSAM 1998-9 A  5.34%,  Matures 1-20-2004                                       3,004,931

                              Morgan Guaranty
                                 Synthetic Investment Contracts (Asset Backed)
           2,020,882 units     CIT Marine 99-A A3, 5.82, Matures 07-15-2005                                        2,020,882
             284,068 units     FH 1388 H 7.02%, Matures 08-16-2004                                                   284,068
           1,391,642 units     FHR 1587 L 6.68%, Matures 07-15-2004                                                1,391,642
           1,243,221 units     FH 1601 PH 5.48%, Matures 01-18-2005                                                1,243,221





                                                         14










                                       EXELON CORPORATION EMPLOYEE SAVINGS PLAN
                                       ----------------------------------------
                                       SCHEDULE OF ASSETS (HELD AT END OF YEAR)
                                       ----------------------------------------
                                               AS OF DECEMBER 31, 2003
                                               -----------------------
                                      Schedule H, Part IV, Item 4i of Form 5500
                                      -----------------------------------------
                              Employer Identification Number 23-2990190, Plan Number 003
                              ----------------------------------------------------------




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


                          Rabo Bank
                             Synthetic Investment Contracts (Asset Backed)
        2,299,562 units   FH 1798 A 5.67%, Matures 06-15-2007                                                2,299,562


                          UBS AG
                              Synthetic Investment Contracts (Asset Backed)
        4,030,693 units       MBNAM 97-1 (A), 5.82%, Matures 08-16-2004                                      4,030,693

                             Westdeutsche Landesbank
                              Synthetic Investment Contract (Asset Backed)
        4,009,615 units        American Express 99-1 A, 5.72%, Matures 04-15-2004                            4,009,615
        2,377,426 units        MSC 1999-CAM1 A2 7.06%, Matures 11-17-2008                                    2,377,426


                                                                                                      -----------------
                                                                                                            23,071,802
                                                                                                      -----------------

                                                   LOANS

                          Participant Loans  (5.25% - 10.50%)                                               60,979,282
                                                                                                      -----------------

                          Total Investments                                                            $ 2,448,718,178
                                                                                                      =================

* A party-in-interest to the Plan.

**  Cost has been omitted as investments are participant directed





                                       15






                                  EXHIBIT INDEX
                                  -------------


Exhibit filed with Form 11-K for the year ended December 31, 2003:


Exhibit Number                         Description of Exhibit
--------------         --------------------------------------------------------
     23                Consent of Independent Registered Public Accounting Firm










                                       16




                                   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.

                                                  Exelon Corporation Employee
Date:   June 28, 2004                             Savings Plan



                                                  /s/ S. Gary Snodgrass
                                                  ------------------------------
                                                  S. Gary Snodgrass
                                                  Chairman, Plan Committee






                                       17