UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                    FORM 8-K



                                 CURRENT REPORT


                Pursuant to Section 13 or 15(d) of the Securities
                              Exchange Act of 1934


                                December 15, 2003
                                (Date of earliest
                                 event reported)





                                                                                 
 Commission File   Name of Registrant; State of Incorporation; Address of        IRS Employer
 Number            Principal Executive Offices; and Telephone Number             Identification Number
 ---------------   ----------------------------------------------------------    ------------------------
 1-16169           EXELON CORPORATION                                            23-2990190
                   (a Pennsylvania corporation)
                   10 South Dearborn Street - 37th Floor
                   P.O. Box 805379
                   Chicago, Illinois 60680-5379
                   (312) 394-7398








Item 5. Other Events

         On December 15, 2003 Exelon  Corporation  (Exelon),  parent  company of
Exelon Thermal Technologies,  announced that it has entered into an agreement to
sell Exelon  Thermal to Macquarie  Bank  Limited of  Australia  for $135 million
before  considering the tax impacts on the gain on the sale,  transaction  costs
and the debt  repayment.  The  transaction is expected to close during the first
quarter  of 2004 and will  result  in an  after-tax  gain of  approximately  $20
million.  The sale does not impact operating earnings guidance for 2004 that has
been previously disclosed. The estimated net cash proceeds will be approximately
$75 million and will be used for general corporate purposes. The news release is
attached to this report as Exhibit 99.

         Except for the historical  information contained herein, certain of the
matters  discussed  in this Report are  forward-looking  statements,  within the
meaning  of the  Private  Securities  Litigation  Reform  Act of 1995,  that are
subject to risks and uncertainties.  The factors that could cause actual results
to differ  materially from the  forward-looking  statements made by a registrant
include those factors  discussed  herein,  as well as the items discussed in (a)
the  Registrants'  2002  Annual  Report  on  Form  10-K - ITEM  7.  Management's
Discussion    and   Analysis   of   Financial    Condition    and   Results   of
Operations--Business  Outlook and the  Challenges  in Managing  Our Business for
each of Exelon,  ComEd,  PECO and Generation,  (b) the Registrants'  2002 Annual
Report on Form  10-K - ITEM 8.  Financial  Statements  and  Supplementary  Data:
Exelon - Note 19,  ComEd - Note 16, PECO - Note 18 and  Generation - Note 13 and
(c) other  factors  discussed in filings with the United States  Securities  and
Exchange Commission (SEC) by the Registrants. Readers are cautioned not to place
undue reliance on these forward-looking  statements,  which apply only as of the
date of this  Report.  None of the  Registrants  undertakes  any  obligation  to
publicly  release any  revision  to its  forward-looking  statements  to reflect
events or circumstances after the date of this Report.






                                   SIGNATURES




Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.




                         EXELON CORPORATION

                         /s/  Robert S. Shapard
                         ----------------------------------------------------
                         Robert S. Shapard
                         Executive Vice President and Chief Financial Officer
                         Exelon Corporation


December 18, 2003