Significant Accounting Policies and Responsibility for Financial Statements	6 Months Ended
	Jun. 30, 2025
Accounting Policies [Abstract]
Significant Accounting Policies and Responsibility for Financial Statements	Significant Accounting Policies and Responsibility for Financial Statements Financial Statement Preparation In the opinion of management, the accompanying unaudited interim Condensed Consolidated Financial Statements reflect all normal and recurring accruals and adjustments that are necessary to present fairly the consolidated financial position at June 30, 2025 and December 31, 2024, and the consolidated results of operations, comprehensive income, and cash flows for the six months ended June 30, 2025 and 2024. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could ultimately differ from those estimated. Weather causes the Company’s results of operations to be seasonal in nature and the results of operations presented in the accompanying Condensed Consolidated Financial Statements are not necessarily representative of operations for an entire year. On August 2, 2024, PNM Resources, Inc. (“PNMR”) amended its Articles of Incorporation to change its name to TXNM Energy, Inc. (“TXNM”) and increase the number of authorized shares of the Company’s common stock from 120,000,000 to 200,000,000. The Notes to Condensed Consolidated Financial Statements include disclosures for TXNM, PNM, and TNMP. This report uses the term “Company” when discussing matters of common applicability to TXNM, PNM, and TNMP. Discussions regarding only TXNM, PNM, or TNMP are so indicated. On May 18, 2025, TXNM, Parent, and Merger Sub, entered into the Merger Agreement, pursuant to which Merger Sub will merge with and into TXNM, with TXNM surviving the Merger as a direct, wholly-owned subsidiary of Parent. Parent and Merger Sub are affiliates of Blackstone Infrastructure. See Note 17. These Condensed Consolidated Financial Statements are unaudited. Certain information and note disclosures normally included in the annual audited Consolidated Financial Statements have been condensed or omitted, as permitted under the applicable rules and regulations. Readers of these financial statements should refer to TXNM’s, PNM’s, and TNMP’s audited Consolidated Financial Statements and Notes thereto that are included in their respective 2024 Annual Reports on Form 10-K. GAAP defines subsequent events as events or transactions that occur after the balance sheet date but before financial statements are issued or are available to be issued. Based on their nature, magnitude, and timing, certain subsequent events may be required to be reflected at the balance sheet date and/or required to be disclosed in the financial statements. The Company has evaluated subsequent events accordingly. Principles of Consolidation The Condensed Consolidated Financial Statements of each of TXNM, PNM, and TNMP include their accounts and those of subsidiaries in which that entity owns a majority voting interest. PNM also consolidates Valencia and ETBC I. See Note 6. PNM owns undivided interests in several jointly-owned power plants and records its pro-rata share of the assets, liabilities, and expenses for those plants. The agreements for the jointly-owned plants provide that if an owner were to default on its payment obligations, the non-defaulting owners would be responsible for their proportionate share of the obligations of the defaulting owner. In exchange, the non-defaulting owners would be entitled to their proportionate share of the generating capacity of the defaulting owner. There have been no such payment defaults under any of the agreements for the jointly-owned plants. PNMR Services Company expenses, which represent costs that are primarily driven by corporate level activities, are charged to the business segments. These services are billed at cost and are reflected as general and administrative expenses in the business segments. Other significant intercompany transactions between TXNM, PNM, and TNMP include interest and income tax sharing payments, as well as equity transactions. See Note 15. All intercompany transactions and balances have been eliminated. Equity Method Investment (Previously held) As discussed in Note 21 of the Company’s 2024 Annual Reports on Form 10-K, PNMR Development and AEP OnSite Partners created NMRD in September 2017 to pursue the acquisition, development, and ownership of renewable energy generation projects, primarily in the state of New Mexico. On February 27, 2024, PNMR Development and AEP OnSite Partners sold their respective interests in NMRD. PNMR Development received net proceeds of $117.0 million and recognized an after-tax gain of $4.4 million, which was presented as cash flows from operating activities on the Condensed Consolidated Statement of Cash Flows in the six months ended June 30, 2024. The recognition of deferred investment tax credits of $15.7 million was also recognized as an income tax benefit on the Condensed Consolidated Statement of Earnings. In the six months ended June 30, 2024, PNMR Development and AEP OnSite Partners each made cash contributions to NMRD of $12.6 million. Dividends on Common Stock Dividends on TXNM’s common stock are declared by the Board. The timing of the declaration of dividends is dependent on the timing of meetings and other actions of the Board. The Board declared dividends on common stock attributable to the second quarter of 2025 of $0.4075 per share in July 2025 and declared dividends on common stock attributable to the second quarter of 2024 of $0.3875 per share in July 2024, which are reflected as Dividends Declared per Common Share on the TXNM Condensed Consolidated Statement of Earnings. TXNM made $250.0 million in cash equity contributions to TNMP in the three and six months ended June 30, 2025. TXNM did not make any cash equity contributions to TNMP in the three and six months ended June 30, 2024. TXNM did not make any cash equity contributions to PNM in the three and six months ended June 30, 2025. TXNM made a $55.0 million cash equity contribution to PNM in the three and six months ended June 30, 2024. Neither PNM nor TNMP declared or paid any cash dividends on their common stock to TXNM in the three and six months ended June 30, 2025 and 2024. New Accounting Pronouncements Information concerning recently issued accounting pronouncements that have not yet been adopted by the Company is presented below. The Company does not expect difficulty in adopting these standards by their required effective dates. Accounting Standards Update 2023-09 - Income Taxes (Topic 740): Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09 enhancing the transparency and decision usefulness of income tax disclosures. Disclosure requirements of this update include (on an annual basis) the disclosure of specific categories in the rate reconciliation and the inclusion of additional information for reconciling items that meet a quantitative threshold (if the effect of the reconciling item is equal to or greater than 5 percent of the amount computed by multiplying pre-tax income by the applicable statutory rate). The amendment also requires the disclosure (on an annual basis) of information about income taxes paid (net of refunds) including the disaggregation by federal, state, and foreign taxes as well as by individual jurisdiction. Additional requirements include the disclosure of income (loss) from continuing operations before income tax expense (benefit) disaggregated between foreign and domestic as well as income tax expense (benefit) from continuing operations disaggregated by federal, state, and foreign. ASU 2023-09 is effective for the Company for the annual reporting period beginning after December 15, 2024, with early adoption being permitted. ASU 2023-09 is to be applied on a prospective basis with retrospective application permitted. The Company expects to adopt the disclosure requirements of ASU 2023-09 with its Annual Report on Form 10-K for the year ended December 31, 2025. Accounting Standards Update 2024-03 - Income Statement (Subtopic 220-40): Reporting Comprehensive Income - Expense Disaggregation Disclosures In November 2024, the FASB issued ASU 2024-03 that will require disclosure, in the notes to the financial statements, of specified information about certain costs and expenses at each interim and annual period. Disclosures should include amounts for purchases of inventory, employee compensation, depreciation, and intangible asset amortization; certain amounts that are already required to be disclosed under GAAP in the same disclosure as other disaggregation requirements; qualitative descriptions of the amounts remaining in relevant expense categories that are not disaggregated; and the total amount of selling expenses including the entity’s definition of selling expenses. In January 2025, ASU 2025-01 was issued to clarify that the amendments of ASU 2024-03 are effective for public business entities for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027.