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Condensed Consolidated Statements of Earnings - TXNM - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Electric Operating Revenues $ 647,162 $ 569,256 $ 1,632,374 $ 1,494,235
Operating Expenses:        
Administrative and general 68,445 64,840 205,205 179,848
Regulatory disallowances (731) 6,142 (731) 10,601
Depreciation and amortization 105,012 97,400 314,798 285,000
Transmission and distribution costs 27,167 23,660 79,133 71,475
Taxes other than income taxes 28,185 25,966 82,864 75,984
Total operating expenses 444,292 378,176 1,284,914 1,116,882
Total operating expenses 202,870 191,080 347,460 377,353
Other Income and Deductions:        
Interest income 6,496 8,669 14,615 17,719
Gains on investment securities 11,376 13,770 33,691 32,326
Other income 7,688 7,953 18,121 20,552
Other (deductions) (3,028) (1,988) (11,767) (20,146)
Net other income and deductions 22,532 28,404 54,660 50,451
Interest Charges 70,149 59,664 205,713 169,254
Earnings before Income Taxes 155,253 159,820 196,407 258,550
Income Taxes 18,949 23,422 21,293 19,822
Net Earnings 136,304 136,398 175,114 238,728
(Earnings) Attributable to Valencia Non-controlling Interest (5,462) (5,064) (13,509) (11,891)
Preferred Stock Dividend Requirements of Subsidiary (132) (132) (396) (396)
Net Earnings Attributable to TXNM $ 130,710 $ 131,202 $ 161,209 $ 226,441
Net Earnings Attributable to TXNM per Common Share:        
Basic (in dollars per share) $ 1.22 $ 1.45 $ 1.63 $ 2.50
Diluted (in dollars per share) 1.22 1.45 1.63 2.50
Dividends Declared per Common Share (in dollars per share) $ 0.4075 $ 0.3875 $ 1.2225 $ 1.1625
Cost of energy        
Electric Operating Revenues $ 647,162 $ 569,256 $ 1,632,374 $ 1,494,235
Operating Expenses:        
Energy costs 195,042 138,909 531,846 425,919
Energy production costs        
Operating Expenses:        
Energy costs $ 21,172 $ 21,259 $ 71,799 $ 68,055