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Segment Information - Summarized Financial Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
segment
Jun. 30, 2023
USD ($)
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 $ 488,102 $ 477,156 $ 924,979 $ 1,021,233        
Utility margin 198,498 181,627 374,426 368,338        
Other operating expenses 133,300 133,235 264,096 258,461        
Depreciation and amortization 94,413 79,139 187,600 157,213        
Operating income (loss) 105,683 92,330 186,273 191,421        
Interest income (expense) 4,470 5,359 9,050 10,202        
Other income (deductions) 6,610 5,862 12,997 12,904        
Interest charges (55,828) (45,899) (109,590) (86,822)        
Earnings before Income Taxes 60,935 57,652 98,730 127,705        
Income taxes (benefit) 8,971 8,229 (3,600) 18,009        
Net Earnings 51,964 49,423 102,330 109,696        
Valencia non-controlling interest (3,783) (3,987) (6,827) (9,114)        
Subsidiary preferred stock dividends (132) (132) (264) (264)        
Net Earnings Available for PNM Common Stock 48,049 45,304 95,239 100,318        
Total Assets 10,583,410 9,626,970 10,583,410 9,626,970   $ 10,252,605    
Goodwill 278,297 278,297 278,297 278,297   278,297    
PNM                
Segment Reporting Information, Profit (Loss) [Abstract]                
Utility margin 124,735 120,215 245,589 260,596        
Other operating expenses 106,578 106,154 213,044 204,876        
Depreciation and amortization 54,230 44,064 107,517 87,750        
Operating income (loss) 58,091 54,415 109,041 132,319        
Interest income (expense) 4,443 5,370 8,970 10,219        
Other income (deductions) 3,869 3,695 24,415 10,728        
Interest charges (25,880) (20,766) (50,996) (38,888)        
Earnings before Income Taxes 40,523 42,714 91,430 114,378        
Income taxes (benefit) 5,821 7,411 11,632 19,240        
Net Earnings 34,702 35,303 79,798 95,138        
Valencia non-controlling interest (3,783) (3,987) (6,827) (9,114)        
Subsidiary preferred stock dividends (132) (132) (264) (264)        
Net Earnings Available for PNM Common Stock 30,787 31,184 72,707 85,760        
Total Assets 7,060,151 6,440,357 7,060,151 6,440,357        
Goodwill 51,632 51,632 51,632 51,632        
TNMP                
Segment Reporting Information, Profit (Loss) [Abstract]                
Utility margin 73,763 61,412 128,837 107,742        
Other operating expenses 34,149 33,395 66,899 66,247        
Depreciation and amortization 31,033 27,949 61,415 55,389        
Operating income (loss) 49,315 38,727 80,053 60,514        
Interest income (expense) 127 121 296 235        
Other income (deductions) 2,705 1,512 3,581 1,648        
Interest charges (14,451) (11,412) (27,787) (21,837)        
Earnings before Income Taxes 37,696 28,948 56,143 40,560        
Income taxes (benefit) 7,771 4,316 11,635 5,895        
Net Earnings 29,925 24,632 44,508 34,665        
Valencia non-controlling interest 0 0 0 0        
Subsidiary preferred stock dividends 0 0 0 0        
Net Earnings Available for PNM Common Stock 29,925 24,632 44,508 34,665        
Total Assets 3,354,923 2,916,206 3,354,923 2,916,206        
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 (7,427) (6,314) (15,847) (12,662)        
Depreciation and amortization 9,150 7,126 18,668 14,074        
Operating income (loss) (1,723) (812) (2,821) (1,412)        
Interest income (expense) (100) (132) (216) (252)        
Other income (deductions) 36 655 (14,999) 528        
Interest charges (15,497) (13,721) (30,807) (26,097)        
Earnings before Income Taxes (17,284) (14,010) (48,843) (27,233)        
Income taxes (benefit) (4,621) (3,498) (26,867) (7,126)        
Net Earnings (12,663) (10,512) (21,976) (20,107)        
Valencia non-controlling interest 0 0 0 0        
Subsidiary preferred stock dividends 0 0 0 0        
Net Earnings Available for PNM Common Stock (12,663) (10,512) (21,976) (20,107)        
Total Assets 168,336 270,407 168,336 270,407        
Goodwill 0 0 0 0        
Energy                
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 488,102 477,156 924,979 1,021,233        
Cost of energy 154,706 172,452 287,010 414,138        
Utility margin 333,396 304,704 637,969 607,095        
Energy | PNM                
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 333,671 338,242 641,786 768,407        
Cost of energy 114,772 133,609 212,184 343,462        
Utility margin 218,899 204,633 429,602 424,945        
Energy | TNMP                
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 154,431 138,914 283,193 252,826        
Cost of energy 39,934 38,843 74,826 70,676        
Utility margin 114,497 100,071 208,367 182,150        
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 333,671 338,242 $ 641,786 768,407        
Depreciation and amortization 54,230 44,064 107,517 87,750        
Operating income (loss) 58,091 54,415 109,041 132,319        
Interest charges (25,880) (20,766) (50,996) (38,888)        
Earnings before Income Taxes 40,523 42,714 91,430 114,378        
Income taxes (benefit) 5,821 7,411 11,632 19,240        
Net Earnings 34,702 35,303 79,798 95,138        
Valencia non-controlling interest (3,783) (3,987) (6,827) (9,114)        
Subsidiary preferred stock dividends (132) (132) (264) (264)        
Net Earnings Available for PNM Common Stock 30,787 31,184 72,707 85,760        
Total Assets 7,060,151   7,060,151     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 114,772 133,609 $ 212,184 343,462        
TNMP                
Segment Reporting Information [Line Items]                
Number of operating segments | segment     1          
Segment Reporting Information, Profit (Loss) [Abstract]                
Electric operating revenues 154,431 138,914 $ 283,193 252,826        
Cost of energy 39,934 38,843 74,826 70,676        
Depreciation and amortization 31,033 27,949 61,415 55,389        
Operating income (loss) 49,315 38,727 80,053 60,514        
Interest charges (14,451) (11,412) (27,787) (21,837)        
Earnings before Income Taxes 37,696 28,948 56,143 40,560        
Income taxes (benefit) 7,771 $ 4,316 11,635 5,895        
Net Earnings     44,508 $ 34,665        
Total Assets 3,354,923   3,354,923     3,145,031    
Goodwill $ 226,665   $ 226,665     $ 226,665 $ 226,700