Exhibit 99.1



                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of FirstEnergy Corp. on Form 10-K/A for the
year  ending  December  31,  2002 as filed  with  the  Securities  and  Exchange
Commission on the date hereof (the "Report"),  I, H. Peter Burg, Chief Executive
Officer of FirstEnergy Corp., certify, pursuant to 18 U.S.C.ss. 1350, as adopted
pursuant toss. 906 of the Sarbanes-Oxley Act of 2002, that:

     (1)  The Report fully  complies with the  requirements  of section 13(a) or
          15(d) of the Securities Exchange Act of 1934; and

     (2)  The  information  contained  in the  Report  fairly  presents,  in all
          material respects,  the financial  condition and results of operations
          of FirstEnergy Corp.



                                              /s/ H. Peter Burg H.
                                             ------------------------
                                                  H. Peter Burg
                                             Chief Executive Officer
                                                   May 9, 2003