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Segment Information - Schedule of Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information, Profit (Loss) [Abstract]      
Operating revenues $ 482,792 $ 436,877  
Administrative and general - direct 52,384 47,395  
Administrative and general - corporate allocation 0 0  
Customer related expenses 8,385 8,032  
Regulatory disallowances   4,459  
Depreciation and amortization 104,551 93,187  
Transmission and distribution costs 25,505 22,764  
Taxes other than income taxes 26,350 25,934  
Total operating expenses 410,903 356,287  
Net other income and (deductions) 5,477 10,967  
Interest charges (63,551) (53,762)  
Income Taxes (Benefits) 1,018 (12,571)  
(Earnings) Attributable to Valencia Non-controlling Interest (3,742) (3,044)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Attributable to TXNM 8,923 47,190  
Total Assets 11,390,620 10,257,653 $ 11,211,733
Goodwill 278,297 278,297 $ 278,297
PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Administrative and general - direct 17,866 9,039  
Administrative and general - corporate allocation 32,087 35,407  
Customer related expenses 7,657 7,290  
Regulatory disallowances   4,459  
Depreciation and amortization 59,803 53,287  
Transmission and distribution costs 15,826 14,350  
Taxes other than income taxes 13,303 13,709  
Total operating expenses 302,042 257,165  
Net other income and (deductions) 3,260 25,073  
Interest charges (29,816) (25,116)  
Income Taxes (Benefits) (37) 5,811  
(Earnings) Attributable to Valencia Non-controlling Interest (3,742) (3,044)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Attributable to TXNM 945 41,920  
Total Assets 7,471,816 6,878,575  
Goodwill 51,632 51,632  
TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Administrative and general - direct (2,052) (1,284)  
Administrative and general - corporate allocation 13,376 14,236  
Customer related expenses 717 717  
Regulatory disallowances   0  
Depreciation and amortization 35,213 30,382  
Transmission and distribution costs 9,679 8,414  
Taxes other than income taxes 11,504 10,667  
Total operating expenses 106,665 98,024  
Net other income and (deductions) 2,406 1,045  
Interest charges (17,322) (13,336)  
Income Taxes (Benefits) 5,548 3,864  
(Earnings) Attributable to Valencia Non-controlling Interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Attributable to TXNM 22,283 14,583  
Total Assets 3,760,714 3,204,936  
Goodwill 226,665 226,665  
Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Administrative and general - direct 36,570 39,640  
Administrative and general - corporate allocation (45,463) (49,643)  
Customer related expenses 11 25  
Regulatory disallowances   0  
Depreciation and amortization 9,535 9,518  
Transmission and distribution costs 0 0  
Taxes other than income taxes 1,543 1,558  
Total operating expenses 2,196 1,098  
Net other income and (deductions) (189) (15,151)  
Interest charges (16,413) (15,310)  
Income Taxes (Benefits) (4,493) (22,246)  
(Earnings) Attributable to Valencia Non-controlling Interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Attributable to TXNM (14,305) (9,313)  
Total Assets 158,090 174,142  
Goodwill 0 0  
Electric operating revenues      
Segment Reporting Information, Profit (Loss) [Abstract]      
Operating revenues 482,792 436,877  
Energy costs 169,182 132,304  
Electric operating revenues | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Operating revenues 333,380 308,115  
Electric operating revenues | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Operating revenues 149,412 128,762  
Electric operating revenues | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Operating revenues 0 0  
Fuel burn      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 26,541 36,682  
Fuel burn | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 26,541 36,682  
Fuel burn | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 0 0  
Fuel burn | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 0 0  
Purchases for resale      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 97,235 54,468  
Purchases for resale | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 97,235 54,468  
Purchases for resale | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 0 0  
Purchases for resale | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 0 0  
Transmission by others      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 45,406 41,154  
Transmission by others | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 7,178 6,262  
Transmission by others | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 38,228 34,892  
Transmission by others | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 0 0  
Energy production costs      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 24,546 22,212  
Energy production costs | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 24,546 22,212  
Energy production costs | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs 0 0  
Energy production costs | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Energy costs $ 0 $ 0