Document:

EX-4.2

Exhibit 4.2

FOURTH SUPPLEMENTAL INDENTURE FOR

ADDITIONAL SUBSIDIARY GUARANTEES

Fourth Supplemental Indenture (this “Supplemental Indenture for Additional
Guarantees”), dated as of March 14, 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 other Guarantors (as defined
in the Indenture referred to herein) 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 second supplemental indenture (the “Second Supplemental Indenture” and, together with the Base
Indenture, the “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
$2,400 million of 7.375% Senior Notes due 2016 (the “Initial Notes”), and, subject to the terms of
the Indenture, future unlimited issuances of 7.375% Senior Notes due 2016 (the “Additional Notes,”
and together with the Initial Notes, the “Notes”);

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 Second 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 Second 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 Second
Supplemental Indenture applicable to a Guarantor and to perform all of the Obligations and
agreements of a Guarantor under the Second Supplemental Indenture. In furtherance of the
foregoing, each of the Guaranteeing Subsidiaries shall be deemed a Guarantor for purposes of
Article 10 of the Second 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.

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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:

NRG BLOCKER I LP

NRG BLOCKER II LP

NRG BLOCKER III INC.

NRG BLOCKER IV INC.

NRG BLOCKER V INC.

NRG BLOCKER VI INC.

NRG BLOCKER VII INC.

TEXAS GENCO LLC

TEXAS GENCO FINANCING CORP.

TEXAS GENCO GP, LLC

NEW GENCO GP, LLC

TEXAS GENCO OPERATING SERVICES LLC

TEXAS GENCO HOLDINGS, INC.

By:  /s/ George P. Schaefer

Name: George P. Schaefer

Title: Vice President

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

TEXAS GENCO II, LP

TEXAS GENCO SERVICES, LP

By: New Genco GP, LLC, its General Partner

By:  /s/ George P. Schaefer

Name: George P. Schaefer

Title: Vice President and Assistant Treasurer

TEXAS GENCO, LP

By: Texas Genco GP, LLC, its General Partner

By:  /s/ George P. Schaefer

Name: George P. Schaefer

Title: Vice President and Assistant Treasurer

Issuer:

NRG ENERGY, INC.

By:  /s/ George P. Schaefer

Name: George P. Schaefer

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

CAPISTRANO COGENERATION COMPANY

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

HANOVER ENERGY COMPANY

HUNTLEY POWER LLC

INDIAN RIVER OPERATIONS INC.

INDIAN RIVER POWER LLC

JAMES RIVER POWER LLC

KAUFMAN COGEN LP

KEYSTONE POWER 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.

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 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 WEST COAST LLC

NRG WESTERN AFFILIATE SERVICES INC.

OSWEGO HARBOR POWER LLC

SAGUARO POWER LLC

SOMERSET OPERATIONS INC.

SOMERSET POWER LLC

VIENNA OPERATIONS INC.

VIENNA POWER LLC

By:  /s/ George P. Schaefer

Name: George P. Schaefer

Title: Treasurer

Attest:

/s/ Tanuja M. Dehne

Name: Tanuja M. Dehne

Title: Corporate Secretary

LAW DEBENTURE TRUST COMPANY OF NEW YORK, as Trustee

By:  /s/ Adam Berman

Name: Adam Berman

Title: Vice President

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SCHEDULE A

SCHEDULE OF GUARANTEEING SUBSIDIARIES

	1.	 	Texas Genco LLC, a Delaware limited liability company

	2.	 	Texas Genco Financing Corp., a Delaware corporation

	3.	 	Texas Genco GP, LLC, a Texas limited liability company

	4.	 	New Genco GP, LLC, a Delaware limited liability company

	5.	 	New Genco LP, LLC, a Delaware limited liability company

	6.	 	Texas Genco Operating Services LLC, a Delaware limited liability company

	7.	 	Texas Genco Holdings, Inc., a Texas corporation

	8.	 	Texas Genco II, LP, a Texas limited partnership

	9.	 	Texas Genco Services, LP, a Texas limited partnership

	10.	 	GCP Funding Company, LLC, a Delaware limited liability company

	11.	 	Texas Genco LP, LLC, a Delaware limited liability company

	12.	 	Texas Genco, LP, a Texas limited partnership

	13.	 	NRG Blocker I LP, a Delaware limited partnership

	14.	 	NRG Blocker II LP, a Delaware limited partnership

	15.	 	NRG Blocker III Inc., a Delaware corporation

	16.	 	NRG Blocker IV Inc., a Delaware corporation

	17.	 	NRG Blocker V Inc., a Delaware corporation

	18.	 	NRG Blocker VI Inc., a Delaware corporation

	19.	 	NRG Blocker VII Inc., a Delaware corporation

3EX-10.110

Exhibit 10.110

March 12, 2006

Mr. Thomas P. Rice

Chief Executive Officer

1010 Seminole Drive #308

Ft. Lauderdale, Florida 33304

Re: Employment Agreement

Dear Tom:

Reference is made to your employment agreement dated February 3, 2004 (the “Employment
Agreement”). We wish to confirm the following under the Employment Agreement (applying its defined
terms):

	1.	 	Severance Payments. The severance compensation to which you may become entitled
under Section 7 of the Employment Agreement is modified as follows: in the event your
employment is terminated pursuant to Section 6(b) or pursuant to Section 6(d), in each case on
or after a Change in Control, then, in addition to the amounts and benefits set forth in
Section 7 (i.e., those amounts and benefits that would be paid or provided upon a termination
of your employment by the Company without Cause under Section 6(b) of the Employment
Agreement), the Company shall pay you (i) a lump sum payment equal to six months of your Base
Compensation amount, and (ii) a lump sum payment equal to fifty-percent of the most recent
Bonus actually paid to you by the Company prior to such Change in Control (less applicable
withholding). These severance amounts would be paid to you within thirty (30) days after
written notice of a qualifying termination (subject to six months’ delay if and as required by
Section 409A (defined below) in order to avoid adverse tax consequences to you under Section
409A). These severance benefits are subject to your execution of the Release referenced in
Section 7 of the Employment Agreement.

	2.	 	Code Section 409A. We intend that the Employment Agreement and any other agreement
or arrangement with the Company (the Employment Agreement and such other agreements and
arrangements, together, the “Arrangements”) comply with Section 409A (“Section 409A”) of the
Internal Revenue Code of 1986, as amended (the “Code”). If any provision of any Arrangement
would result in the imposition on you of a penalty tax under Section 409A, or any related
guidance issued by the U.S. Treasury Department or the Internal Revenue Service, the Company
shall, after consulting with you, reform such Arrangement to avoid the imposition of such
penalty; provided that any such reformation shall to the maximum extent possible retain the
originally intended economic and tax benefits to you under such Arrangement, and the original
purpose of such Arrangement, without violating Section 409A or creating any unintended or
adverse tax consequences to you. Such reform may include, without limitation, imposition of a
six month delay in the payment of severance benefits if required under Section 409A due to the
fact that you are a “key employee” under Section 409A and the amounts payable to you under
such Arrangement are considered “deferred compensation” of a type requiring six-month delay
under Section 409A. The Company shall indemnify and hold you harmless, on an after-tax basis,
for any additional tax (including interest and penalties with respect thereto) imposed on you
as a result of Code Section 409A with regard to the payments and benefits hereunder.

	3.	 	280G Gross Up. The Company wishes to modify the “gross up” payments provided for
under Section 7 of the Employment Agreement. You will be paid “gross up” amounts in an
aggregate amount equal to (i) any excise taxes incurred by you as a result of any amounts or
benefits provided to you by the Company pursuant to the Employment Agreement, any other
Arrangement or otherwise that are considered to be “parachute payments” under Internal Revenue
Code Section 280G and the regulations promulgated thereunder, and (ii) any federal and state
and local income tax liability arising as a result of the payment of such excise tax (in each
case, including any interest and penalties imposed with respect to such taxes), payable within
sixty (60) days after such excise and income taxes are incurred (subject to six months’ delay
if and as required by Section 409A in order to avoid adverse consequences to you under Section
409A).

	4.	 	RSU Deferrals. Consistent with the foregoing, your ability to defer receipt of the
common stock to be received upon vesting of the RSU grant referenced in Section 4(C) of the
Employment Agreement is disallowed.

All other terms of the Employment Agreement remain in full force and effect.

Please indicate your agreement with the terms and conditions set forth in this Letter
Agreement by signing the enclosed copy of this Letter Agreement and returning it to me.

Very truly yours

ANDRX CORPORATION

By:     

Name: Robert I. Goldfarb

Title: Senior Vice President, General Counsel and Secretary

Accepted and Agreed:

     

Thomas P. Rice

Dated: March 11, 2006

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