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Segment Information - Summarized Financial Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
segment
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 436,877 $ 544,077  
Utility margin 175,928 186,711  
Other operating expenses 130,796 125,226  
Depreciation and amortization 93,187 78,074  
Operating income 80,590 99,091  
Interest income (expense) 4,580 4,843  
Other income (deductions) 6,387 7,042  
Interest Charges (53,762) (40,923)  
Earnings before Income Taxes 37,795 70,053  
Income taxes (benefit) (12,571) 9,780  
Net Earnings 50,366 60,273  
Valencia non-controlling interest (3,044) (5,127)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 47,190 55,014  
Total Assets 10,257,653 9,353,136 $ 10,252,605
Goodwill $ 278,297 278,297 278,297
PNM      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 308,115 430,165  
Depreciation and amortization 53,287 43,686  
Operating income 50,950 77,904  
Interest Charges (25,116) (18,122)  
Earnings before Income Taxes 50,907 71,664  
Income taxes (benefit) 5,811 11,829  
Net Earnings 45,096 59,835  
Valencia non-controlling interest (3,044) (5,127)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 41,920 54,576  
Total Assets 6,878,575   6,813,065
Goodwill $ 51,632   51,632
TNMP      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 128,762 113,912  
Cost of energy 34,892 31,833  
Depreciation and amortization 30,382 27,440  
Operating income 30,738 21,787  
Interest Charges (13,336) (10,425)  
Earnings before Income Taxes 18,447 11,612  
Income taxes (benefit) 3,864 1,579  
Net Earnings 14,583 10,033  
Total Assets 3,204,936   3,145,031
Goodwill 226,665   $ 226,665
PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Utility margin 120,854 140,381  
Other operating expenses 106,466 98,722  
Depreciation and amortization 53,287 43,686  
Operating income 50,950 77,904  
Interest income (expense) 4,527 4,849  
Other income (deductions) 20,546 7,033  
Interest Charges (25,116) (18,122)  
Earnings before Income Taxes 50,907 71,664  
Income taxes (benefit) 5,811 11,829  
Net Earnings 45,096 59,835  
Valencia non-controlling interest (3,044) (5,127)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 41,920 54,576  
Total Assets 6,878,575 6,306,396  
Goodwill 51,632 51,632  
TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Utility margin 55,074 46,330  
Other operating expenses 32,750 32,852  
Depreciation and amortization 30,382 27,440  
Operating income 30,738 21,787  
Interest income (expense) 169 114  
Other income (deductions) 876 136  
Interest Charges (13,336) (10,425)  
Earnings before Income Taxes 18,447 11,612  
Income taxes (benefit) 3,864 1,579  
Net Earnings 14,583 10,033  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Available for PNM Common Stock 14,583 10,033  
Total Assets 3,204,936 2,803,168  
Goodwill 226,665 226,665  
Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Utility margin 0 0  
Other operating expenses (8,420) (6,348)  
Depreciation and amortization 9,518 6,948  
Operating income (1,098) (600)  
Interest income (expense) (116) (120)  
Other income (deductions) (15,035) (127)  
Interest Charges (15,310) (12,376)  
Earnings before Income Taxes (31,559) (13,223)  
Income taxes (benefit) (22,246) (3,628)  
Net Earnings (9,313) (9,595)  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Available for PNM Common Stock (9,313) (9,595)  
Total Assets 174,142 243,572  
Goodwill 0 0  
Energy      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 436,877 544,077  
Cost of energy 132,304 241,686  
Utility margin 304,573 302,391  
Energy | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of energy 97,412 209,853  
Energy | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 308,115 430,165  
Cost of energy 97,412 209,853  
Utility margin 210,703 220,312  
Energy | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 128,762 113,912  
Cost of energy 34,892 31,833  
Utility margin 93,870 82,079  
Energy | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 0 0  
Cost of energy 0 0  
Utility margin $ 0 $ 0