ONE HUNDRED-EIGHTEENTH SUPPLEMENTAL INDENTURE FOR ADDITIONAL SUBSIDIARIES GUARANTEES

Exhibit 4.1

ONE HUNDRED-EIGHTEENTH SUPPLEMENTAL INDENTURE FOR
ADDITIONAL SUBSIDIARIES GUARANTEES

ONE-HUNDRED EIGHTEENTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture for Additional Guarantees”), dated as of October 28, 2015, among Energy Choice Solutions LLC, a Texas limited liability company, NRG ECOKAP Holdings LLC, a Delaware limited liability company, NRG Greenco LLC, a Delaware limited liability company and NRG Greenco Holdings LLC, a Delaware limited liability company (collectively, the “Guaranteeing Subsidiaries”), subsidiaries of NRG Energy, Inc., a Delaware corporation (the “Company”), the Company, the Existing Guarantors set forth on the signature pages hereto (the “Existing Guarantors”), and Law Debenture Trust Company of New York, as trustee under the Indenture 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 (i) a thirty-sixth supplemental indenture (the “Thirty-Sixth Supplemental Indenture”), dated as of August 20, 2010, among the Company, the Guarantors party thereto and the Trustee, providing for the original issuance of an aggregate principal amount of $1,100 million of 8.25% Senior Notes due 2020 (the “2020 Initial Notes”), and, subject to the terms of the Thirty-Sixth Supplemental Indenture, future unlimited issuances of 8.25% Senior Notes due 2020 (the “2020 Additional Notes,” and together with the 2020 Initial Notes, the “2020 Notes”), (ii) a forty-second supplemental indenture (the “Forty-Second Supplemental Indenture”), dated as of January 26, 2011, among the Company, the Guarantors party thereto and the Trustee, providing for the original issuance of an aggregate principal amount of $1,200 million of 7.625% Senior Notes due 2018 (the “2018 Initial Notes”), and, subject to the terms of the Forty-Second Supplemental Indenture, future unlimited issuances of 7.625% Senior Notes due 2018 (the “2018 Additional Notes,” and together with the 2018 Initial Notes, the “2018 Notes”), (iii) a fifty-first supplemental indenture (the “Fifty-First Supplemental Indenture”), dated as of May 24, 2011, among the Company, the Guarantors party thereto and the Trustee, providing for the original issuance of an aggregate principal amount of $1,200 million of 7.875% Senior Notes due 2021 (the “2021 Initial Notes”), and, subject to the terms of the Fifty-First Supplemental Indenture, future unlimited issuances of 7.875% Senior Notes due 2021 (the “2021 Additional Notes,” and together with the 2021 Initial Notes, the “2021 Notes”), (iv) a seventieth supplemental indenture (the “Seventieth Supplemental Indenture”), dated as of September 24, 2012, among the Company, the Guarantors party thereto and the Trustee, providing for the original issuance of an aggregate principal amount of $990 million of 6.625% Senior Notes due 2023 (the “2023 Initial Notes”), and, subject to the terms of the Seventieth Supplemental Indenture, future unlimited issuances of 6.625% Senior Notes due 2023 (the “2023 Additional Notes,” and together with the 2023 Initial Notes, the “2023 Notes”), and (v) a one hundred-ninth supplemental indenture (the “One Hundred-Ninth Supplemental Indenture” and, collectively with the Base Indenture, the Thirty-Sixth Supplemental Indenture, the Forty-Second Supplemental Indenture, the Fifty-First Supplemental Indenture and the Seventieth Supplemental Indenture, each as further supplemented and amended to the date hereof, the “Indenture”), dated as of January 27, 2014, among the Company, the Guarantors party thereto and the Trustee, providing for the original issuance of an aggregate principal amount of $1,100 million of 6.250% Senior Notes due 2022 (the “2022 Initial Notes”), and, subject to the terms of the One Hundred-Ninth Supplemental Indenture, future unlimited issuances of 6.250% Senior Notes due 2022 (the “2022 Additional Notes,” and together with the 2022 Initial Notes, the “2022 Notes,” which, collectively with the 2020 Notes, the 2018 Notes, the 2021 Notes and the 2023 Notes, are referred to herein as 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 each of the Thirty-Sixth Supplemental Indenture, the Forty-Second Supplemental Indenture, the Fifty-First Supplemental Indenture and the Seventieth Supplemental Indenture, and Section 4.16 of the One Hundred-Ninth Supplemental Indenture, the Trustee, the Company and the Existing 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 Existing 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; Guarantees. The Guaranteeing Subsidiaries hereby become parties to the Indenture as Guarantors 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.  The Guaranteeing Subsidiaries hereby agree to be bound by all of the provisions of the Indenture applicable to a Guarantor and to perform all of the Obligations and agreements of a Guarantor under the Indenture.  In furtherance of the foregoing, the Guaranteeing Subsidiaries shall be deemed Guarantors for purposes of Article 10 of each of the Thirty-Sixth Supplemental Indenture, the Forty-Second Supplemental Indenture, the Fifty-First Supplemental Indenture, the Seventieth Supplemental Indenture and the One Hundred-Ninth 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.