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 NSTAR, 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:
the enclosed Quarterly Report of NSTAR on Form 10-Q for the period ended March 31, 2006 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and
the information contained in such Quarterly Report fairly presents, in all material respects, the financial condition and results of operation of NSTAR.
Dated: April 28, 2006
/s/ THOMAS J. MAY
Thomas J. May
Chairman, President and
Chief Executive Officer
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