SEVENTH SUPPLEMENTAL INDENTURE FOR ADDITIONAL SUBSIDIARY GUARANTEES

EXHIBIT 4.1

SEVENTH SUPPLEMENTAL INDENTURE FOR
ADDITIONAL SUBSIDIARY GUARANTEES

     Seventh Supplemental Indenture (this “Supplemental Indenture for Additional Guarantees”), dated as of November 13, 2006, among the guaranteeing subsidiaries listed on Schedule A hereto (the “Guaranteeing Subsidiaries”), each an indirect subsidiary of NRG Energy, Inc., a Delaware corporation (the “Company”), the Company, the Existing Guarantors set forth on the signature page hereto (the “Existing Guarantors”) and Law Debenture Trust Company of New York, as trustee under the indentures referred to below (the “Trustee”).

W I T N E S S E T H

     WHEREAS, the Company has heretofore executed and delivered to the Trustee an indenture (the “Base Indenture”), dated as of February 2, 2006, between the Company and the Trustee, as amended by a first supplemental indenture (the “First Supplemental Indenture”), dated as of February 2, 2006, among the Company, the Guarantors named therein and the Trustee, providing for the original issuance of an aggregate principal amount of $1,200 million of 7.250% Senior Notes due 2014 (the “Initial Notes”), and, subject to the terms of the Indenture, future unlimited issuances of 7.250% Senior Notes due 2014 (the “Additional Notes,” and together with the Initial Notes, the “Notes”), a third supplemental indenture (the “Third Supplemental Indenture”), dated as of March 14, 2006, among the Company, the Existing Guarantors party thereto and the Trustee and a fifth supplemental indenture, dated as of April 28, 2006, among the Company, the Existing Guarantors and the Trustee (together with the Base Indenture, the First Supplemental Indenture and the Third Supplemental Indenture, the “Indenture”);

     WHEREAS, the Indenture provides that under certain circumstances the Guaranteeing Subsidiaries shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiaries shall unconditionally guarantee all of the Company’s Obligations under the Notes and the Indenture (the “Additional Guarantees”); and

     WHEREAS, pursuant to Section 4.17 of the First Supplemental Indenture, the Trustee, the Company and the other Guarantors are authorized and required to execute and deliver this Supplemental Indenture for Additional Guarantees.

     NOW THEREFORE, in consideration of the foregoing and for good and valuable consideration, the receipt of which is hereby acknowledged, the Guaranteeing Subsidiaries, the Trustee, the Company and the other Guarantors mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

     1. Capitalized Terms. Unless otherwise defined in this Supplemental Indenture for Additional Guarantees, capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

     2. Agreement to be Bound; Guarantee. Each of the Guaranteeing Subsidiaries hereby becomes a party to the First Supplemental Indenture as a Guarantor and as such will have all of the rights and be subject to all of the Obligations and agreements of a Guarantor under the Indenture. Each of the Guaranteeing Subsidiaries hereby agrees to be bound by all of the provisions of the First Supplemental Indenture applicable to a Guarantor and to perform all of the Obligations and agreements of a Guarantor under the First Supplemental Indenture. In furtherance of the foregoing, each of the Guaranteeing Subsidiaries shall be deemed a Guarantor for purposes of Article 10 of the First Supplemental Indenture, including, without limitation, Section 10.02 thereof.

     3. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE FOR ADDITIONAL GUARANTEES BUT WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

     4. Counterparts. The parties may sign any number of copies of this Supplemental Indenture for Additional Guarantees. Each signed copy shall be an original, but all of them together represent the same agreement.

     5. Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

     6. The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture for Additional Guarantees or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries and the Company.

     7. Ratification of Indenture; Supplemental Indenture for Additional Guarantees Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture for Additional Guarantees shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall by bound hereby.

     IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture for Additional Guarantees to be duly executed and attested, all as of the date first above written.

		Guaranteeing Subsidiaries:
		HUNTLEY IGCC LLC INDIAN RIVER IGCC LLC MONTVILLE IGCC LLC PADOMA WIND POWER, LLC HOFFMAN SUMMIT WIND PROJECT, LLC SAN JUAN MESA WIND PROJECT II, LLC
		By:		/s/ Clint Freeland
		Name:		Clint Freeland
		Title:		Treasurer
		LAKE ERIE PROPERTIES INC.
		By:		/s/ Clint Freeland
		Name:		Clint Freeland
		Title:		Vice President and Treasurer
		Issuer:
		NRG ENERGY, INC.
		By:		/s/ Clint Freeland
		Name:		Clint Freeland
		Title:		Vice President and Treasurer
		Existing Guarantors:
		ARTHUR KILL POWER LLC ASTORIA GAS TURBINE POWER LLC BERRIANS I GAS TURBINE POWER LLC BIG CAJUN II UNIT 4 LLC CABRILLO POWER I LLC CABRILLO POWER II LLC CHICKAHOMINY RIVER ENERGY CORP. COMMONWEALTH ATLANTIC POWER LLC CONEMAUGH POWER LLC CONNECTICUT JET POWER LLC DEVON POWER LLC

		DUNKIRK POWER LLC EASTERN SIERRA ENERGY COMPANY EL SEGUNDO POWER LLC EL SEGUNDO POWER II LLC HANOVER ENERGY COMPANY HUNTLEY POWER LLC INDIAN RIVER OPERATIONS INC. INDIAN RIVER POWER LLC JAMES RIVER POWER LLC KAUFMAN COGEN LP KEYSTONE POWER LLC LONG BEACH GENERATION LLC LOUISIANA GENERATING LLC MIDDLETOWN POWER LLC MONTVILLE POWER LLC NEO CALIFORNIA POWER LLC NEO CHESTER-GEN LLC NEO CORPORATION NEO FREEHOLD-GEN LLC NEO LANDFILL GAS HOLDINGS INC. NEO POWER SERVICES INC. NEW GENCO GP, LLC NORWALK POWER LLC NRG AFFILIATE SERVICES INC. NRG ARTHUR KILL OPERATIONS INC. NRG ASIA-PACIFIC, LTD. NRG ASTORIA GAS TURBINE OPERATIONS, INC. NRG BAYOU COVE LLC NRG CABRILLO POWER OPERATIONS INC. NRG CADILLAC OPERATIONS INC. NRG CALIFORNIA PEAKER OPERATIONS LLC NRG CONNECTICUT AFFILIATE SERVICES INC. NRG DEVON OPERATIONS INC. NRG DUNKIRK OPERATIONS INC. NRG EL SEGUNDO OPERATIONS INC. NRG GENERATION HOLDINGS, INC. NRG HUNTLEY OPERATIONS INC. NRG INTERNATIONAL LLC NRG KAUFMAN LLC NRG MESQUITE LLC NRG MIDATLANTIC AFFILIATE SERVICES INC. NRG MIDDLETOWN OPERATIONS INC. NRG MONTVILLE OPERATIONS INC. NRG NEW JERSEY ENERGY SALES LLC NRG NEW ROADS HOLDINGS LLC NRG NORTH CENTRAL OPERATIONS INC. NRG NORTHEAST AFFILIATE SERVICES INC. NRG NORWALK HARBOR OPERATIONS INC. NRG OPERATING SERVICES, INC. NRG OSWEGO HARBOR POWER OPERATIONS INC. NRG POWER MARKETING INC.

		NRG ROCKY ROAD LLC NRG SAGUARO OPERATIONS INC. NRG SOUTH CENTRAL AFFILIATE SERVICES INC. NRG SOUTH CENTRAL GENERATING LLC NRG SOUTH CENTRAL OPERATIONS INC. NRG TEXAS LLC NRG WEST COAST LLC NRG WESTERN AFFILIATE SERVICES INC. OSWEGO HARBOR POWER LLC SAGUARO POWER LLC SOMERSET OPERATIONS INC. SOMERSET POWER LLC TEXAS GENCO FINANCING CORP. TEXAS GENCO GP, LLC TEXAS GENCO HOLDINGS, INC. TEXAS GENCO OPERATING SERVICES, LLC VIENNA OPERATIONS INC. VIENNA POWER LLC WCP (GENERATION) HOLDINGS LLC WEST COAST POWER LLC
		By:		/s/ Clint Freeland
		Name:		Clint Freeland
		Title:		Treasurer
		GCP FUNDING COMPANY, LLC NEW GENCO LP, LLC TEXAS GENCO LP, LLC
		By:		/s/ Susan T. Dubb
		Name:		Susan T. Dubb
		Title:		Treasurer and Secretary
		NRG SOUTH TEXAS LP
		By: Texas Genco GP, LLC, its General Partner
		By:		/s/ Clint Freeland
		Name:		Clint Freeland
		Title:		Vice President and Treasurer
		NRG TEXAS LP TEXAS GENCO SERVICES, LP
		By: New Genco GP, LLC, its General Partner

				By: Name:		/s/ Clint Freeland   Clint Freeland
				Title:		Vice President and Treasurer
Attest:
/s/ Tanuja M. Dehne   Name: Tanuja M. Dehne
Title: Corporate Secretary
				LAW DEBENTURE TRUST COMPANY OF NEW YORK,      as Trustee
				By: Name:		/s/ Daniel R. Fisher   Daniel R. Fisher
				Title:		Senior Vice President

SCHEDULE A

SCHEDULE OF GUARANTEEING SUBSIDIARIES

1.		Lake Erie Properties Inc., a Delaware corporation
2.		Huntley IGCC LLC, a Delaware limited liability company
3.		Indian River IGCC LLC, a Delaware limited liability company
4.		Montville IGCC LLC, a Delaware limited liability company
5.		Padoma Wind Power, LLC, a California limited liability company
6.		Hoffman Summit Wind Project, LLC, a California limited liability company
7.		San Juan Mesa Wind Project II, LLC, a Delaware limited liability company