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


                        
The undersigned hereby certifies, in my capacity as an officer
of Boston Edison Company, for purposes of 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that to the best of my knowledge:

  (i)  the enclosed Annual Report of Boston Edison Company on
       Form 10-K for the year ended December 31, 2002 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 such Report fairly presents,
       in all material respects, the financial condition and
       results of operations of Boston Edison Company.

Dated:  March 27, 2003      By:   /s/ THOMAS J. MAY
                                  Thomas J. May
                                  Chairman, President and
                                  Chief Executive Officer