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Segment Information - Schedule of Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues $ 502,420 $ 488,102 $ 985,212 $ 924,979  
Administrative and general - direct 67,647 51,010 120,031 98,405  
Administrative and general - corporate allocation 0 0 0 0  
Customer related expenses 8,344 8,571 16,729 16,603  
Regulatory disallowances       4,459  
Depreciation and amortization 105,235 94,413 209,786 187,600  
Transmission and distribution costs 26,461 25,051 51,966 47,815  
Taxes other than income taxes 28,329 24,084 54,679 50,018  
Total operating expenses 429,719 382,419 840,622 738,706  
Net other income and (deductions) 26,651 11,080 32,128 22,047  
Interest charges (72,013) (55,828) (135,564) (109,590)  
Income taxes (benefit) 1,326 8,971 2,344 (3,600)  
Valencia non-controlling interest (4,305) (3,783) (8,047) (6,827)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings Attributable to TXNM 21,576 48,049 30,499 95,239  
Total Assets 11,675,264 10,583,410 11,675,264 10,583,410 $ 11,211,733
Goodwill 278,297 278,297 278,297 278,297 $ 278,297
PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Administrative and general - direct 16,603 16,111 34,469 25,150  
Administrative and general - corporate allocation 35,317 31,023 67,405 66,430  
Customer related expenses 7,606 7,742 15,262 15,032  
Regulatory disallowances       4,459  
Depreciation and amortization 60,778 54,230 120,581 107,517  
Transmission and distribution costs 15,750 15,350 31,576 29,700  
Taxes other than income taxes 15,262 11,768 28,565 25,477  
Total operating expenses 301,733 275,580 603,775 532,745  
Net other income and (deductions) 26,545 8,312 29,805 33,385  
Interest charges (31,975) (25,880) (61,791) (50,996)  
Income taxes (benefit) 2,410 5,821 2,373 11,632  
Valencia non-controlling interest (4,305) (3,783) (8,047) (6,827)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings Attributable to TXNM 24,362 30,787 25,307 72,707  
Total Assets 7,593,440 7,060,151 7,593,440 7,060,151  
Goodwill 51,632 51,632 51,632 51,632  
TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Administrative and general - direct 134 45 (1,918) (1,239)  
Administrative and general - corporate allocation 14,110 12,885 27,486 27,121  
Customer related expenses 750 775 1,467 1,492  
Regulatory disallowances       0  
Depreciation and amortization 34,926 31,033 70,139 61,415  
Transmission and distribution costs 10,711 9,701 20,390 18,115  
Taxes other than income taxes 11,444 10,743 22,948 21,410  
Total operating expenses 115,361 105,116 222,026 203,140  
Net other income and (deductions) 1,694 2,832 4,100 3,877  
Interest charges (23,942) (14,451) (41,264) (27,787)  
Income taxes (benefit) 5,471 7,771 11,019 11,635  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to TXNM 20,968 29,925 43,251 44,508  
Total Assets 3,923,342 3,354,923 3,923,342 3,354,923  
Goodwill 226,665 226,665 226,665 226,665  
Corporate and Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Administrative and general - direct 50,910 34,854 87,480 74,494  
Administrative and general - corporate allocation (49,427) (43,908) (94,891) (93,551)  
Customer related expenses (12) 54 0 79  
Regulatory disallowances       0  
Depreciation and amortization 9,531 9,150 19,066 18,668  
Transmission and distribution costs 0 0 0 0  
Taxes other than income taxes 1,623 1,573 3,166 3,131  
Total operating expenses 12,625 1,723 14,821 2,821  
Net other income and (deductions) (1,588) (64) (1,777) (15,215)  
Interest charges (16,096) (15,497) (32,509) (30,807)  
Income taxes (benefit) (6,555) (4,621) (11,048) (26,867)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to TXNM (23,754) (12,663) (38,059) (21,976)  
Total Assets 158,482 168,336 158,482 168,336  
Goodwill 0 0 0 0  
Electric operating revenues          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 502,420 488,102 985,212 924,979  
Energy costs 167,622 154,706 336,804 287,010  
Electric operating revenues | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 338,372 333,671 671,752 641,786  
Electric operating revenues | TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 164,048 154,431 313,460 283,193  
Electric operating revenues | Corporate and Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 0 0 0 0  
Fuel burn          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 29,927 41,821 56,468 78,502  
Fuel burn | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 29,927 41,821 56,468 78,502  
Fuel burn | TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 0 0 0 0  
Fuel burn | Corporate and Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 0 0 0 0  
Purchases for resale          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 88,870 68,047 186,105 122,516  
Purchases for resale | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 88,870 68,047 186,105 122,516  
Purchases for resale | TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 0 0 0 0  
Purchases for resale | Corporate and Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 0 0 0 0  
Transmission by others          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 48,825 44,838 94,231 85,992  
Transmission by others | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 5,539 4,904 12,717 11,166  
Transmission by others | TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 43,286 39,934 81,514 74,826  
Transmission by others | Corporate and Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 0 0 0 0  
Energy production costs          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 26,081 24,584 50,627 46,796  
Energy production costs | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 26,081 24,584 50,627 46,796  
Energy production costs | TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 0 0 0 0  
Energy production costs | Corporate and Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs $ 0 $ 0 $ 0 $ 0