ALBUQUERQUE, N.M.

October 31, 2025

•2025 third quarter GAAP earnings of $1.22 per diluted share

•2025 third quarter ongoing earnings of $1.33 per diluted share

•Proposed transaction with Blackstone Infrastructure approved by shareholders

TXNM Energy (In millions, except EPS)

TXNM Energy (NYSE: TXNM) today released its 2025 third quarter results. As previously announced, TXNM Energy is not affirming previously issued earnings guidance for 2025 and does not plan to issue revised earnings guidance during the pending transaction.

“Third quarter results incorporate the implementation of the first phase of approved rates in New Mexico and newly approved transmission recovery in Texas, along with additional equity issued during the quarter,” said Don Tarry, President and CEO of TXNM Energy. “We have initiated the regulatory approval process for our transaction with Blackstone Infrastructure with filings that address the key issues raised during our conversations with local stakeholders and community groups. We look forward to continued conversations through the regulatory process and achieving the best path forward to invest in positive outcomes for our customers and communities across New Mexico and Texas.”

On May 19, 2025, TXNM Energy announced an agreement under which affiliates of Blackstone Infrastructure will acquire the outstanding common stock of TXNM Energy for $61.25 per share. Shareholders approved the transaction on August 28, 2025.

The transaction is subject to regulatory approvals from the New Mexico Public Regulation Commission ("NMPRC"), Public Utility Commission of Texas ("PUCT"), Federal Energy Regulatory Commission ("FERC"), Department of Justice (Hart Scott-Rodino Clearance), Nuclear Regulatory Commission and Federal Communications Commission. On August 25, 2025, applications were filed with the NMPRC, PUCT and FERC.

TXNM Energy continues to anticipate that the closing of the acquisition will occur in the second half of 2026, subject to the satisfaction or waiver of the customary closing conditions, including among other things, receipt of required state and federal regulatory approvals.

TNMP’s second Transmission Cost of Service (TCOS) filing for 2025 was approved and implemented in the third quarter, providing recovery for $87 million of rate base. On July 31, 2025, TNMP filed its second Distribution Cost Recovery Factor (DCRF) application, seeking recovery for an additional $28 million of rate base to support ongoing investment in distribution infrastructure.

On August 6, 2025, PNM filed an application with the NMPRC for approval of a CCN to construct, own, and operate 30 megawatts of energy storage. The application consists of six megawatt batteries to be constructed at five existing PNM-owned solar facilities at an estimated cost of $78 million. These investments will provide more flexibility to our grid and to assist in serving our summer peak season when operational.

•PNM – a vertically integrated electric utility in New Mexico with distribution, transmission and generation assets.

•TNMP – an electric transmission and distribution utility in Texas.

•Corporate and Other – reflects the TXNM Energy holding company and other subsidiaries.

                    

Net changes to GAAP and ongoing earnings in the third quarter of 2025 compared to the third quarter of 2024 include:

•PNM: Rate relief from the implementation of the first phase of the approved 2025 Rate Request, higher retail load and transmission revenues, higher realized gains on investment securities and the timing of excess deferred income taxes were offset by lower weather-related usage, increased O&M, higher depreciation, property tax and interest expense associated with new capital investments and increased demand charges from energy storage agreements added in late 2024.

•TNMP: Rate recovery through the Distribution Cost Recovery Factor (DCRF) and Transmission Cost of Service (TCOS) rate mechanisms and higher retail load were partially offset by lower weather-related usage and higher depreciation and property tax expense associated with new capital investments.

•Corporate and Other: Lower interest expense due to lower debt balances increased earnings.

GAAP and ongoing earnings per share were reduced in the third quarter of 2025 by shares issued as part of 2024 forward sales agreements of $150 million, as well as shares issued in June and August 2025 for proceeds of $800 million.

In addition, GAAP earnings in the third quarter of 2025 included $2.1 million of net unrealized losses on investment securities compared to $9.5 million of net unrealized gains in the third quarter of 2024. GAAP earnings in the third quarter of 2025 included $14.0 million of costs related to the planned acquisition. GAAP earnings in the third quarter of 2024 included $6.1 million of regulatory disallowances.

TXNM Energy (NYSE: TXNM), an energy holding company based in Albuquerque, New Mexico, delivers energy to more than 800,000 homes and businesses across Texas and New Mexico through its regulated utilities, TNMP and PNM. For more information, visit the company's website at www.TXNMEnergy.com.

Analysts                        Media

Lisa Goodman                        Corporate Communications

(505) 241-2160                    (505) 241-2743

Statements made in this press release that relate to future events or expectations, projections, estimates, intentions, goals, targets, and strategies are made pursuant to the Private Securities Litigation Reform Act of 1995. These forward-looking statements generally include statements regarding the potential transaction between TXNM Energy and Blackstone Infrastructure, including any statements regarding the expected timetable for completing the potential transaction, the ability to complete the potential transaction, the expected benefits of the potential transaction, projected financial information, future opportunities, and any other statements regarding TXNM Energy’s and Blackstone Infrastructure’s future expectations, beliefs, plans, objectives, results of operations, financial condition and cash flows, or future events or performance. Readers are cautioned that all forward-looking statements are based upon current expectations and estimates. Neither Blackstone Infrastructure nor TXNM Energy assumes any obligation to update this information. Because actual results may differ materially from those expressed or implied by these forward-looking statements, TXNM Energy caution readers not to place undue reliance on these statements. TXNM Energy’s business, financial condition, cash flow, and operating results are influenced by many factors, which are often beyond its control, that can cause actual results to differ from those expressed or implied by the forward-looking statements. For a discussion of risk factors and other important factors affecting forward-looking statements, please see TXNM Energy’s Form 10-K and Form 10-Q filings and the information filed on TXNM Energy’s Forms 8-K with the Securities and Exchange Commission (the “SEC”), which factors are specifically incorporated by reference herein and the risks and uncertainties related to the proposed transaction with Blackstone Infrastructure, including, but not limited to: the expected timing and likelihood of completion of the pending transaction, including the timing, receipt and terms and conditions of any required governmental and regulatory approvals of the pending transaction that could reduce anticipated benefits or cause the parties to abandon the transaction, the occurrence of any event, change or other circumstances that could give rise to the termination of the transaction agreement, including in circumstances requiring the Company to pay a termination fee, the possibility that TXNM Energy’s shareholders may not approve the transaction agreement, the risk that the parties may not be able to satisfy the conditions to the proposed transaction in a timely manner or at all, the outcome of legal proceedings that may be instituted against TXNM Energy, its directors and others related to the proposed transaction, risks related to disruption of management time from ongoing business operations due to the proposed transaction, the risk that the proposed transaction and its announcement could have an adverse effect on the ability of TXNM Energy to retain and hire key personnel and maintain relationships with its customers and suppliers, and on its operating results and businesses generally, the amount of costs, fees, charges or expenses resulting from the proposed transaction, and the risk that the price of TXNM Energy’s common stock may fluctuate during the pendency of the proposed transaction and may decline significantly if the proposed transaction is not completed. Other unpredictable or unknown factors not discussed in this communication could also have material adverse effects on forward-looking statements. Readers are cautioned not to place undue reliance on these forward-looking statements that speak only as of the date hereof.

GAAP refers to generally accepted accounting principles in the U.S. Ongoing earnings is a non-GAAP financial measure that excludes the impact of net unrealized mark-to-market gains and losses on economic hedges, the net change in unrealized gains and losses on investment securities, pension expense related to previously disposed of gas distribution business, and certain non-recurring, infrequent, and other items that are not indicative of fundamental changes in the earnings capacity of the Company's operations. The Company uses ongoing earnings and ongoing earnings per diluted share to evaluate the operations of the Company and to establish goals, including those used for certain aspects of incentive compensation, for management and employees. While the Company believes these financial measures are appropriate and useful for investors, they are not measures presented in accordance with GAAP. The Company does not intend for these measures, or any piece of these measures, to represent any financial measure as defined by GAAP. Furthermore, the Company’s calculations of these measures as presented may or may not be comparable to similarly titled measures used by other companies. Reconciliations between GAAP and ongoing earnings are contained in schedules 1-4.