PNM Resources

414 Silver Ave. SW

Albuquerque, NM 87102-3289

www.pnmresources.com

EXHIBIT 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. § 1350, AS ADOPTED PURSUANT TO § 906 OF THE

SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q for the period ended June 30, 2023, for PNM Resources, Inc. (“Company”), as filed with the Securities and Exchange Commission on August 4, 2023 (“Report”), each of the undersigned officers of the Company certifies, pursuant to 18 U.S.C. §1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1)the Report fully complies with the requirements of § 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	August 4, 2023	By:	/s/ Patricia K. Collawn
			Patricia K. Collawn
			Chairman and Chief Executive Officer
			PNM Resources, Inc.
		By:	/s/ Elisabeth A. Eden
			Elisabeth A. Eden
			Senior Vice President, Chief Financial Officer and
			Treasurer
			PNM Resources, Inc.