Exhibit 4.6  


PLEDGE SUPPLEMENT  


        This PLEDGE SUPPLEMENT, dated June 30, 2003, is delivered by MSW Energy Hudson LLC, a Delaware limited liability company (the "New Grantor"), pursuant to
the Pledge and Security Agreement, dated as of June 25, 2003 (as it may be from time to time amended, restated, modified or supplemented, the "Security Agreement"), among MSW Energy Holdings
LLC, a Delaware limited liability company ("MSW Holdings"), MSW Energy Finance Co., Inc. ("MSW
Finance" and, together with MSW Holdings, the "Company"), and Wells Fargo Bank Minnesota, National Association, as the
Collateral Agent. Capitalized terms used herein not otherwise defined herein shall have the meanings ascribed thereto in the Security Agreement. 


        New
Grantor hereby confirms the grant to the Collateral Agent set forth in the Security Agreement of, and does hereby grant to the Collateral Agent, a security interest in all of New
Grantor's right, title and interest in and to all Collateral to secure the Secured Obligations and New Grantor's guarantee of the Notes or the obligations of the Company under the Indenture, in each
case, whether now or hereafter existing or in which New Grantor now has or hereafter acquires an interest and wherever the same may be located. From and after the date hereof, New Grantor shall be a
"Grantor" for all purposes of the Security Agreement. New Grantor hereby makes, as of the date hereof, all of the representations and warranties set forth in the Security Agreement, except that the
New Grantor's interest in Duke/UAE Ref-Fuel LLC is subject to the restrictions on transfer and right of first offer set forth in Sections 11.1 and 11.2 of the Amended and Restated Limited
Liability Company Agreement of Duke/UAE Ref-Fuel LLC, as amended. New Grantor represents and warrants that the attached Supplements to Schedules attached as  Exhibit A hereto accurately and
completely set forth all additional information required pursuant to the Security Agreement and hereby agrees
that such Supplements to Schedules shall constitute part of the Schedules to the Security Agreement. 


        Any
notice or other communication shall be sent to New Grantor at the address set forth below: 




MSW
Energy Hudson LLC

c/o AIG Highstar Capital, L.P.

175 Water Street, 26th Floor

New York, New York 10038

Fax No.: (212) 458-2222

Attention: Michael Miller 


and



c/o
DLJ Merchant Banking Partners

Eleven Madison Avenue, 16th Floor

New York, New York 10010-3629

Fax No.: (646) 935-7043

Attention: Daniel Clare 





        New
Grantor hereby irrevocably appoints the Collateral Agent as New Grantor's attorney-in-fact, with full authority in the place and stead of New Grantor and in
the name of New Grantor, and hereby agrees to be bound by all of the terms, provisions and obligations contained in Section 6 of the Security Agreement. 


[Signature Page Follows] 







        IN
WITNESS WHEREOF, New Grantor has caused this Pledge Supplement to be duly executed and delivered by its duly authorized officer as of this 30thday of June, 2003. 



	 	 	MSW ENERGY HUDSON LLC
	

 	
 	

By:	
 	

MSW Energy Holdings, LLC, its Sole Member
	

 	
 	

By:	
 	

/s/  MICHAEL J. MILLER      
 Name: Michael J. Miller

Title: Chief Executive Officer