Nstar 10-K 2009 FY Annual report

Exhibit 32.2

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 NSTAR (the “Company”) on Form 10-K for the year ending December 31 2009 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, James J. Judge, Senior Vice President and Chief Financial Officer of the Company, certify, pursuant to 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 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 the Company.

Date: February 5, 2010	By:	/S/    JAMES J. JUDGE
		James J. Judge
		Senior Vice President
		and Chief Financial Officer