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Segment Information - Summarized Financial Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
segment
Sep. 30, 2023
USD ($)
Apr. 01, 2024
USD ($)
Dec. 31, 2023
USD ($)
Apr. 01, 2020
USD ($)
Apr. 01, 2018
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues $ 569,256 $ 505,851 $ 1,494,235 $ 1,527,084        
Utility margin 297,272 177,178 671,698 545,516        
Other operating expenses 141,867 128,694 405,963 387,155        
Depreciation and amortization 97,400 80,192 285,000 237,405        
Operating income (loss) 191,080 86,652 377,353 278,073        
Interest income (expense) 8,669 5,366 17,719 15,568        
Other income (deductions) 19,735 (4,531) 32,732 8,374        
Interest charges (59,664) (49,838) (169,254) (136,660)        
Earnings before Income Taxes 159,820 37,649 258,550 165,355        
Income taxes (benefit) 23,422 (5,267) 19,822 12,742        
Net Earnings 136,398 42,916 238,728 152,613        
Valencia non-controlling interest (5,064) (5,058) (11,891) (14,172)        
Subsidiary preferred stock dividends (132) (132) (396) (396)        
Net Earnings Attributable to TXNM 131,202 37,726 226,441 138,045        
Total Assets 10,843,481 10,050,841 10,843,481 10,050,841   $ 10,252,605    
Goodwill 278,297 278,297 278,297 278,297   278,297    
PNM                
Segment Reporting Information, Profit (Loss) [Abstract]                
Utility margin 212,218 95,721 457,807 356,317        
Other operating expenses 114,591 100,739 327,635 305,615        
Depreciation and amortization 56,424 44,537 163,941 132,287        
Operating income (loss) 134,009 30,696 243,050 163,015        
Interest income (expense) 8,674 5,323 17,644 15,542        
Other income (deductions) 17,296 (7,598) 41,711 3,130        
Interest charges (27,852) (22,354) (78,848) (61,242)        
Earnings before Income Taxes 132,127 6,067 223,557 120,445        
Income taxes (benefit) 18,265 (7,199) 29,897 12,041        
Net Earnings 113,862 13,266 193,660 108,404        
Valencia non-controlling interest (5,064) (5,058) (11,891) (14,172)        
Subsidiary preferred stock dividends (132) (132) (396) (396)        
Net Earnings Attributable to TXNM 108,666 8,076 181,373 93,836        
Total Assets 7,164,439 6,731,852 7,164,439 6,731,852        
Goodwill 51,632 51,632 51,632 51,632        
TNMP                
Segment Reporting Information, Profit (Loss) [Abstract]                
Utility margin 85,054 81,457 213,891 189,199        
Other operating expenses 35,121 35,055 102,020 101,302        
Depreciation and amortization 31,732 28,357 93,147 83,746        
Operating income (loss) 58,470 56,154 138,523 116,668        
Interest income (expense) 130 178 426 413        
Other income (deductions) 2,285 2,448 5,866 4,096        
Interest charges (15,924) (12,095) (43,711) (33,932)        
Earnings before Income Taxes 44,961 46,685 101,104 87,245        
Income taxes (benefit) 9,266 7,181 20,901 13,076        
Net Earnings 35,695 39,504 80,203 74,169        
Valencia non-controlling interest 0 0 0 0        
Subsidiary preferred stock dividends 0 0 0 0        
Net Earnings Attributable to TXNM 35,695 39,504 80,203 74,169        
Total Assets 3,505,709 3,039,357 3,505,709 3,039,357        
Goodwill 226,665 226,665 226,665 226,665        
Corporate and Other                
Segment Reporting Information, Profit (Loss) [Abstract]                
Utility margin 0 0 0 0        
Other operating expenses (7,845) (7,100) (23,692) (19,762)        
Depreciation and amortization 9,244 7,298 27,912 21,372        
Operating income (loss) (1,399) (198) (4,220) (1,610)        
Interest income (expense) (135) (135) (351) (387)        
Other income (deductions) 154 619 (14,845) 1,148        
Interest charges (15,888) (15,389) (46,695) (41,486)        
Earnings before Income Taxes (17,268) (15,103) (66,111) (42,335)        
Income taxes (benefit) (4,109) (5,249) (30,976) (12,375)        
Net Earnings (13,159) (9,854) (35,135) (29,960)        
Valencia non-controlling interest 0 0 0 0        
Subsidiary preferred stock dividends 0 0 0 0        
Net Earnings Attributable to TXNM (13,159) (9,854) (35,135) (29,960)        
Total Assets 173,333 279,632 173,333 279,632        
Goodwill 0 0 0 0        
Energy                
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 569,256 505,851 1,494,235 1,527,084        
Cost of energy 138,909 210,313 425,919 624,451        
Utility margin 430,347 295,538 1,068,316 902,633        
Energy | PNM                
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 406,519 350,334 1,048,305 1,118,741        
Cost of energy 101,495 174,362 313,679 517,824        
Utility margin 305,024 175,972 734,626 600,917        
Energy | TNMP                
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 162,737 155,517 445,930 408,343        
Cost of energy 37,414 35,951 112,240 106,627        
Utility margin 125,323 119,566 333,690 301,716        
Energy | Corporate and Other                
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 0 0 0 0        
Cost of energy 0 0 0 0        
Utility margin 0 0 $ 0 0        
PNM                
Segment Reporting Information [Line Items]                
Number of operating segments | segment     1          
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 406,519 350,334 $ 1,048,305 1,118,741        
Depreciation and amortization 56,424 44,537 163,941 132,287        
Operating income (loss) 134,009 30,696 243,050 163,015        
Interest charges (27,852) (22,354) (78,848) (61,242)        
Earnings before Income Taxes 132,127 6,067 223,557 120,445        
Income taxes (benefit) 18,265 (7,199) 29,897 12,041        
Net Earnings 113,862 13,266 193,660 108,404        
Valencia non-controlling interest (5,064) (5,058) (11,891) (14,172)        
Subsidiary preferred stock dividends (132) (132) (396) (396)        
Net Earnings Attributable to TXNM 108,666 8,076 181,373 93,836        
Total Assets 7,164,439   7,164,439     6,813,065    
Goodwill 51,632   51,632   $ 51,600 51,632   $ 51,600
PNM | Energy                
Segment Reporting Information, Profit (Loss) [Abstract]                
Cost of energy 101,495 174,362 $ 313,679 517,824        
TNMP                
Segment Reporting Information [Line Items]                
Number of operating segments | segment     1          
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 162,737 155,517 $ 445,930 408,343        
Cost of energy 37,414 35,951 112,240 106,627        
Depreciation and amortization 31,732 28,357 93,147 83,746        
Operating income (loss) 58,470 56,154 138,523 116,668        
Interest charges (15,924) (12,095) (43,711) (33,932)        
Earnings before Income Taxes 44,961 46,685 101,104 87,245        
Income taxes (benefit) 9,266 $ 7,181 20,901 13,076        
Net Earnings     80,203 $ 74,169        
Total Assets 3,505,709   3,505,709     3,145,031    
Goodwill $ 226,665   $ 226,665     $ 226,665 $ 226,700