Third Amendment to Third Amended and Restated Credit Agreement, dated as of September 15, 2021, among TNMP identified therein and KeyBank, National Association, as administrative agent (TNMP Revolving Credit Facility)

THIS THIRD AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) is entered into as of September 15, 2021, among TEXAS-NEW MEXICO POWER COMPANY, a Texas corporation (the “Borrower”), the Lenders party hereto and KEYBANK, NATIONAL ASSOCIATION, as Administrative Agent for the Lenders (in such capacity, the “Administrative Agent”). Capitalized terms used herein and not otherwise defined shall have the meanings assigned thereto in the Credit Agreement (as defined below).

WHEREAS, the Borrower, the Lenders party thereto and the Administrative Agent are parties to that certain Third Amended and Restated Credit Agreement, dated as of September 25, 2017 (as amended by a First Amendment to Third Amended and Restated Credit Agreement dated April 19, 2019 and a Second Amendment to Third Amended and Restated Credit Agreement dated October 26, 2020, and as further amended or modified from time to time, the “Credit Agreement”);

WHEREAS, the Borrower has requested certain modifications to the Credit Agreement as described below; and

WHEREAS, the Administrative Agent and the Lenders party hereto are willing to agree to such modifications and the other provisions contained herein, subject to the terms set forth herein as more fully set forth below.

NOW, THEREFORE, in consideration of the premises and the mutual covenants contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1.    Amendments to Credit Agreement. Effective as of the date first written above and subject to the conditions set forth in Section 2 below, the Credit Agreement is hereby amended as follows:

(a)     The following shall be added as a new definition in Section 1.1 of the Credit Agreement in alphabetical order:

(b)    The definition of “Change of Control” in Section 1.1 of the Credit Agreement is hereby amended and restated in its entirety to read as follows:

(c)    Section 8.2 of the Credit Agreement is hereby amended to insert immediately after the phrase “merge with or into any other Person” now appearing in clause (a) thereof, the following: “(other than in connection with the Merger Agreement)”.

2.    Effectiveness. This Amendment shall be effective on the date of receipt by the Administrative Agent of (i) copies of this Amendment duly executed by the Borrower, the Administrative Agent and the Required Lenders and (ii) the Administrative Agent’s and its affiliates’ fees and expenses (including fees and expenses of counsel for the Administrative Agent) in connection with this Amendment (such date, the “Effective Date”).

3.    Ratification of Credit Agreement. The term “Credit Agreement” as used in each of the Credit Documents shall hereafter mean the Credit Agreement as amended and modified by this Amendment and as amended and modified from time to time hereafter. Except as herein specifically agreed, the Credit Agreement, as amended by this Amendment, is hereby ratified and confirmed and shall remain in full force and effect according to its terms. Each party hereto acknowledges and consents to the modifications set forth herein and agrees that, other than as explicitly set forth in Section 1 above, this Amendment does not impair, reduce or limit any of its obligations under the Credit Documents (including, without limitation, the indemnity obligations set forth therein) and that, after the date hereof, this Amendment shall constitute a Credit Document. The execution, delivery and effectiveness of this Amendment shall not, except as expressly provided herein, operate as a waiver of any right, power or remedy of any Lender or the

Administrative Agent under any of the Credit Documents or constitute a waiver of any provision of any of the Credit Documents.

5.    Authority/Enforceability. The Borrower represents and warrants as follows:

(a)    It has taken all necessary action to authorize the execution, delivery and performance of this Amendment.

(b)    This Amendment has been duly executed and delivered by the Borrower and constitutes the Borrower’s legal, valid and binding obligation, enforceable in accordance with its terms, except as such enforceability may be subject to (i) bankruptcy, insolvency, reorganization, fraudulent conveyance or transfer, moratorium or similar laws affecting creditors’ rights generally and (ii) general principles of equity (regardless of whether such enforceability is considered in a proceeding at law or in equity).

(c)    No consent, approval, authorization or order of, or filing, registration or qualification with, any court or governmental authority or third party is required in connection with the execution, delivery or performance by the Borrower of this Amendment, or, if required, any such consent, approval, authorization, order, filing, registration or qualification has been previously obtained or made.

5.    Representations and Warranties. The Borrower represents and warrants to the Lenders that (a) the representations and warranties of the Borrower set forth in Section 6 of the Credit Agreement are true and correct in all material respects (except to the extent that any such representation and warranty that is qualified by materiality, Material Adverse Effect or Material Adverse Change shall be true and correct in all respects) as of the date hereof, unless they specifically refer to an earlier date, except that all references in Section 6.7 of the Credit Agreement to December 31, 2016 shall be changed to December 31, 2020 for purposes hereof, (b) after giving effect to this Amendment, no event has occurred and is continuing which constitutes a Default or an Event of Default, and (c) it has no claims, counterclaims, offsets, credits or defenses to its obligations under the Credit Documents, or to the extent it has any, they are hereby released in consideration of the Lenders party hereto entering into this Amendment.

6.    No Conflicts. The Borrower represents and warrants that the execution and delivery of this Amendment, the consummation of the transactions contemplated herein and in the Credit Agreement (before and after giving effect to this Amendment), and the performance of and compliance with the terms and provisions hereof by the Borrower will not (a) violate, contravene or conflict with any provision of its articles or certificate of incorporation, bylaws or other organizational or governing document, (b) violate, contravene or conflict with any law, rule, regulation (including, without limitation, Regulation U and Regulation X), order, writ, judgment, injunction, decree or permit applicable to the Borrower, (c) violate, contravene or conflict with contractual provisions of, or cause an event of default under, any indenture, loan agreement, mortgage, deed of trust, contract or other agreement or instrument to which the Borrower is a party or by which it or its properties may be bound, the violation of which would have or would be reasonably expected to have a Material Adverse Effect or (d) result in or require the creation of any Lien upon or with respect to the Borrower’s properties (except the Lien of the FMB Mortgage Documents in favor of the First Mortgage Bond Trustee).

7.    Counterparts/Telecopy. This Amendment may be executed by one or more of the parties hereto on any number of separate counterparts, including both paper and electronic counterparts, and all of said counterparts taken together shall be deemed to constitute one and the same instrument. Signatures delivered by facsimile or PDF shall have the same force and effect as manual signatures delivered in person. This Amendment may be executed using Electronic Signatures (including, without limitation, facsimile and .pdf) and shall be considered an original, and shall have the same legal effect, validity and enforceability

as a paper record. For the avoidance of doubt, the authorization under this paragraph may include, without limitation, use or acceptance by the Administrative Agent of a manually signed paper hereof which has been converted into electronic form (such as scanned into PDF format), or an electronically signed communication converted into another format, for transmission, delivery and/or retention. For purposes hereof, “Electronic Signature” shall have the meaning assigned to it by 15 USC §7006, as it may be amended from time to time.

8.    GOVERNING LAW. THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.