Exhibit 32.1

         Certificate Pursuant to Section 1350 of Chapter 63 of Title 18
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                               United States Code
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         The undersigned officer hereby certifies, as to the Quarterly Report on
     Form 10-Q of Exelon  Corporation  for the  quarterly  period ended June 30,
     2003,  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:  July 30, 2003                   /s/ John W. Rowe
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                                            John W. Rowe
                                            Chairman and Chief Executive Officer