Southwestern Public Service (SPS): Other Events, Financial Statements And Exhibits

Item 8.01. Other Events. On May 2, 2025, Southwestern Public Service Company, a New Mexico corporation (“SPS”), issued $500,000,000 in aggregate principal amount of 5.30% First Mortgage Bonds, Series No. 12 due 2035 (the “Bonds”) pursuant to an Underwriting Agreement among SPS and Goldman Sachs & Co. LLC, KeyBanc Capital Markets Inc. and SMBC Nikko Securities America, Inc., as the representatives of the several underwriters named therein. The Bonds are being issued pursuant to the registration statement on Form S-3 (File No. 333-278797-01) (the “Registration Statement”). A prospectus supplement relating to the offering and sale of the Bonds was filed with the Securities and Exchange Commission on April 30, 2025. The Bonds will be governed by the Indenture, dated as of August 1, 2011, by and between SPS and U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as trustee, as supplemented by Supplemental Indenture No. 12 dated as of April 15, 2025. This Current Report on Form 8-K is being filed to report as exhibits certain documents in connection with that offering and sale for incorporation by reference into the Registration Statement. Item 9.01. Financial Statements and Exhibits. (d) Exhibits. Exhibit Description 4.01 Indenture dated as of August 1, 2011 between Southwestern Public Service Company and U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as Trustee (incorporated by reference to a Current Report on Form 8-K filed by SPS on August 10, 2011). 4.02 Supplemental Indenture No. 12 dated as of April 15, 2025 between Southwestern Public Service Company and U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as Trustee, creating 5.30% First Mortgage Bonds, Series No. 12 due 2035. 4.03 Form of 5.30% First Mortgage Bonds due 2035 (included in Exhibit 4.02). 5.01 Opinion of Faegre Drinker Biddle & Reath LLP as to the legality of the securities. 5.02 Opinion of Snell & Wilmer, L.L.P. as to the legality of the securities. 5.03 Opinion of Graves, Dougherty, Hearon & Moody, P.C. as to the legality of the securities. 23.01 Consent of Faegre Drinker Biddle & Reath LLP (included in Exhibit 5.01). 23.02 Consent of Snell & Wilmer, L.L.P. (included in Exhibit 5.02). 23.03 Consent of Graves, Dougherty, Hearon & Moody, P.C. (included in Exhibit 5.03) 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Southwestern Public Service Company (a New Mexico corporation) By: /s/ Todd A. Wehner Name: Todd A. Wehner Title: Vice President, Treasurer Date: May 2, 2025

Southwestern Public Service (SPS): Other Events, Financial Statements And Exhibits

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