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Consolidated Statements of Earnings - TXNM - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Electric Operating Revenues $ 1,971,199 $ 1,939,198 $ 2,249,555
Operating Expenses:      
Administrative and general 247,116 227,900 227,149
Regulatory disallowances 8,980 71,923 832
Depreciation and amortization 384,925 319,503 304,853
Transmission and distribution costs 98,380 98,721 94,684
Taxes other than income taxes 100,580 95,940 92,989
Total operating expenses 1,517,713 1,707,858 1,855,795
Operating income 453,486 231,340 393,760
Other Income and Deductions:      
Interest income 23,537 21,963 16,095
(Gains) losses on investment securities 26,851 19,246 (78,357)
Other income 28,621 24,204 21,601
Other (deductions) (24,189) (15,869) (13,881)
Net other income and (deductions) 54,820 49,544 (54,542)
Interest Charges 228,066 190,355 127,908
Earnings before Income Taxes 280,240 90,529 211,310
Income Taxes (Benefits) 21,518 (16,350) 26,130
Net Earnings 258,722 106,879 185,180
(Earnings) Attributable to Valencia Non-controlling Interest (16,040) (18,533) (15,122)
Subsidiary preferred stock dividends (528) (528) (528)
Net earnings attributable to TXNM, basic $ 242,154 $ 87,818 $ 169,530
Net Earnings Attributable to TXNM per Common Share:      
Basic (in dollars per share) $ 2.67 $ 1.02 $ 1.97
Diluted (in dollars per share) $ 2.67 $ 1.02 $ 1.97
Electricity      
Electric Operating Revenues $ 1,971,199 $ 1,939,198 $ 2,249,555
Operating Expenses:      
Cost of energy and production costs 583,984 802,261 987,941
Energy production costs      
Operating Expenses:      
Cost of energy and production costs $ 93,748 $ 91,610 $ 147,347