Exhibit 99-1




               Certificate Pursuant to Section 1350 of Chapter 63
                         of Title 18 United States Code
              -----------------------------------------------------

         The undersigned  officer hereby certifies,  as to the Amended Quarterly
Report on Form 10-Q/A of Exelon  Corporation for the quarterly period ended June
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:  October 30, 2002                              /s/ John W. Rowe
                                                     ---------------------------
                                                     John W. Rowe
                                                     Chairman of the Board and
                                                     Chief Executive Officer
                                                     Exelon Corporation