Exhibit 32.1

Certification of Periodic Financial Report Pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q for the third quarter ended September 30, 2006 of MSW Energy Holdings LLC as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Anthony J. Orlando and Mark A. Pytosh, as Chief Executive Officer and Chief Financial Officer, respectively, of MSW Energy Holdings LLC, hereby certifies, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to their knowledge:

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

	(2)		the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of MSW Energy Holdings LLC; and

This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by MSW Energy Holdings LLC for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

A signed original of this written statement has been provided to MSW Energy Holdings LLC and will be retained by MSW Energy Holdings LLC and furnished to the Securities and Exchange Commission or its staff upon request.

/s/ Anthony J. Orlando

Anthony J. Orlando

/s/ Mark A. Pytosh

Mark A. Pytosh

Chief Executive Officer and President

Senior Vice President and Chief Financial Officer

October 30, 2006

October 30, 2006

MSW ENERGY HOLDINGS LLC 10-Q