Exhibit 99.1


              Certificate Pursuant to Section 1350 of Chapter 63 of
                          Title 18 United States Code
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         The undersigned  officer hereby certifies,  as to the Amended Quarterly
Report on Form  10-Q/A of Exelon  Corporation  for the  quarterly  period  ended
September 30, 2002, that (i) the report fully complies with the  requirements of
section  13(a) or 15(d) of the  Securities  Exchange  Act of 1934,  and (ii) the
information  contained in the report fairly presents,  in all material respects,
the financial condition and results of operations of Exelon Corporation.



Date:  November 1, 2002                     /s/ John W. Rowe
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                                            John W. Rowe
                                            Chairman of the Board and
                                            Chief Executive Officer
                                            Exelon Corporation