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Segment Information - Schedule of Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues $ 647,162 $ 569,256 $ 1,632,374 $ 1,494,235  
Administrative and general - direct 59,900 56,025 179,931 154,430  
Administrative and general - corporate allocation 0 0 0 0  
Customer related expenses 8,545 8,815 25,274 25,418  
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  
Net other income and (deductions) 22,532 28,404 54,660 50,451  
Interest charges (70,149) (59,664) (205,713) (169,254)  
Income taxes (benefit) 18,949 23,422 21,293 19,822  
Valencia non-controlling interest (5,462) (5,064) (13,509) (11,891)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Attributable to TXNM 130,710 131,202 161,209 226,441  
Total Assets 11,971,534 10,843,481 11,971,534 10,843,481 $ 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 22,764 18,683 57,233 43,833  
Administrative and general - corporate allocation 30,865 33,095 98,270 99,525  
Customer related expenses 7,792 8,031 23,054 23,063  
Regulatory disallowances (731) 6,142 (731) 10,601  
Depreciation and amortization 61,366 56,424 181,947 163,941  
Transmission and distribution costs 18,127 15,123 49,703 44,823  
Taxes other than income taxes 14,111 12,258 42,676 37,735  
Total operating expenses 328,319 272,510 932,094 805,255  
Net other income and (deductions) 17,334 25,970 47,139 59,355  
Interest charges (33,805) (27,852) (95,596) (78,848)  
Income taxes (benefit) 10,907 18,265 13,280 29,897  
Valencia non-controlling interest (5,462) (5,064) (13,509) (11,891)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Attributable to TXNM 102,429 108,666 127,736 181,373  
Total Assets 7,793,306 7,164,439 7,793,306 7,164,439  
Goodwill 51,632 51,632 51,632 51,632  
TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Administrative and general - direct 969 462 (948) (777)  
Administrative and general - corporate allocation 12,136 13,192 39,621 40,314  
Customer related expenses 753 769 2,220 2,260  
Regulatory disallowances 0 0 0 0  
Depreciation and amortization 34,956 31,732 105,095 93,147  
Transmission and distribution costs 9,040 8,537 29,430 26,652  
Taxes other than income taxes 12,659 12,161 35,607 33,571  
Total operating expenses 112,702 104,267 334,728 307,407  
Net other income and (deductions) 5,623 2,415 9,723 6,292  
Interest charges (24,754) (15,924) (66,018) (43,711)  
Income taxes (benefit) 10,479 9,266 21,498 20,901  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to TXNM 41,130 35,695 84,381 80,203  
Total Assets 4,013,441 3,505,709 4,013,441 3,505,709  
Goodwill 226,665 226,665 226,665 226,665  
Corporate and Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Administrative and general - direct 36,167 36,880 123,646 111,374  
Administrative and general - corporate allocation (43,001) (46,287) (137,891) (139,839)  
Customer related expenses 0 15 0 95  
Regulatory disallowances 0 0 0 0  
Depreciation and amortization 8,690 9,244 27,756 27,912  
Transmission and distribution costs 0 0 0 0  
Taxes other than income taxes 1,415 1,547 4,581 4,678  
Total operating expenses 3,271 1,399 18,092 4,220  
Net other income and (deductions) (425) 19 (2,202) (15,196)  
Interest charges (11,590) (15,888) (44,099) (46,695)  
Income taxes (benefit) (2,437) (4,109) (13,485) (30,976)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to TXNM (12,849) (13,159) (50,908) (35,135)  
Total Assets 164,787 173,333 164,787 173,333  
Goodwill 0 0 0 0  
Electric operating revenues          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 647,162 569,256 1,632,374 1,494,235  
Energy costs 195,042 138,909 531,846 425,919  
Electric operating revenues | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 463,720 406,519 1,135,472 1,048,305  
Electric operating revenues | TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 183,442 162,737 496,902 445,930  
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 26,312 28,659 82,780 107,161  
Fuel burn | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 26,312 28,659 82,780 107,161  
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 119,834 66,396 305,939 188,912  
Purchases for resale | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 119,834 66,396 305,939 188,912  
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 48,896 43,854 143,127 129,846  
Transmission by others | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 6,707 6,440 19,424 17,606  
Transmission by others | TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 42,189 37,414 123,703 112,240  
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 21,172 21,259 71,799 68,055  
Energy production costs | PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Energy costs 21,172 21,259 71,799 68,055  
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