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


                                  May 29, 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
333-85496                  EXELON GENERATION COMPANY, LLC                               23-3064219
                           (a Pennsylvania limited liability company)
                           300 Exelon Way
                           Kennett Square, Pennsylvania 19348
                           (610) 765-6900








Item 5. Other Events

On May 30,  2003,  Exelon  Corporation  issued a notice to the Exelon  financial
community  announcing  the  issuance  of a call notice on May 29, 2003 by Exelon
Fossil Holdings,  Inc., a wholly owned subsidiary of Exelon Generation  Company,
LLC, for the  remaining  50.1%  interest in Sithe  Energies,  Inc. The notice is
attached as Exhibit 99.


This  combined  Form 8-K is being filed  separately  by Exelon  Corporation  and
Exelon  Generation  Company,  LLC  (Registrants).  Information  contained herein
relating to any individual  registrant has been filed by such  registrant on its
own behalf. No registrant makes any representation as to information relating to
any other registrant.

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 discussed  herein, as well as those 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 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
                                   EXELON GENERATION COMPANY, LLC


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


May 30, 2003