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Segment Information - Summarized Financial Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
segment
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Apr. 01, 2018
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]        
Electric operating revenues $ 544,077 $ 444,118    
Utility margin 186,711 154,240    
Other operating expenses 125,226 131,872    
Depreciation and amortization 78,074 75,764    
Operating income 99,091 68,068    
Interest income (expense) 4,843 4,292    
Other income (deductions) 7,042 (24,484)    
Interest Charges (40,923) (26,220)    
Earnings before Income Taxes 70,053 21,656    
Income taxes (benefit) 9,780 2,438    
Net Earnings 60,273 19,218    
Valencia non-controlling interest (5,127) (3,095)    
Subsidiary preferred stock dividends (132) (132)    
Net Earnings Available for PNM Common Stock 55,014 15,991    
Total Assets 9,353,136 8,727,686 $ 9,257,377  
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 $ 430,165 338,709    
Depreciation and amortization 43,686 45,790    
Operating income 77,904 45,016    
Interest Charges (18,122) (14,572)    
Earnings before Income Taxes 71,664 8,361    
Income taxes (benefit) 11,829 823    
Net Earnings 59,835 7,538    
Valencia non-controlling interest (5,127) (3,095)    
Subsidiary preferred stock dividends (132) (132)    
Net Earnings Available for PNM Common Stock 54,576 4,311    
Total Assets 6,306,396   6,272,166  
Goodwill $ 51,632   51,632 $ 51,600
TNMP        
Segment Reporting Information [Line Items]        
Number of operating segments | segment 1      
Segment Reporting Information, Profit (Loss) [Abstract]        
Electric operating revenues $ 113,912 105,409    
Cost of energy 31,833 29,600    
Depreciation and amortization 27,440 23,642    
Operating income 21,787 24,242    
Interest Charges (10,425) (9,150)    
Earnings before Income Taxes 11,612 17,211    
Income taxes (benefit) 1,579 2,151    
Net Earnings 10,033 15,060    
Total Assets 2,803,168   2,746,601  
Goodwill 226,665   $ 226,665 $ 226,700
PNM        
Segment Reporting Information, Profit (Loss) [Abstract]        
Utility margin 140,381 108,928    
Other operating expenses 98,722 109,089    
Depreciation and amortization 43,686 45,790    
Operating income 77,904 45,016    
Interest income (expense) 4,849 3,133    
Other income (deductions) 7,033 (25,216)    
Interest Charges (18,122) (14,572)    
Earnings before Income Taxes 71,664 8,361    
Income taxes (benefit) 11,829 823    
Net Earnings 59,835 7,538    
Valencia non-controlling interest (5,127) (3,095)    
Subsidiary preferred stock dividends (132) (132)    
Net Earnings Available for PNM Common Stock 54,576 4,311    
Total Assets 6,306,396 6,040,088    
Goodwill 51,632 51,632    
TNMP        
Segment Reporting Information, Profit (Loss) [Abstract]        
Utility margin 46,330 45,312    
Other operating expenses 32,852 27,925    
Depreciation and amortization 27,440 23,642    
Operating income 21,787 24,242    
Interest income (expense) 114 1,182    
Other income (deductions) 136 937    
Interest Charges (10,425) (9,150)    
Earnings before Income Taxes 11,612 17,211    
Income taxes (benefit) 1,579 2,151    
Net Earnings 10,033 15,060    
Valencia non-controlling interest 0 0    
Subsidiary preferred stock dividends 0 0    
Net Earnings Available for PNM Common Stock 10,033 15,060    
Total Assets 2,803,168 2,450,081    
Goodwill 226,665 226,665    
Corporate and Other        
Segment Reporting Information, Profit (Loss) [Abstract]        
Utility margin 0 0    
Other operating expenses (6,348) (5,142)    
Depreciation and amortization 6,948 6,332    
Operating income (600) (1,190)    
Interest income (expense) (120) (23)    
Other income (deductions) (127) (205)    
Interest Charges (12,376) (2,498)    
Earnings before Income Taxes (13,223) (3,916)    
Income taxes (benefit) (3,628) (536)    
Net Earnings (9,595) (3,380)    
Valencia non-controlling interest 0 0    
Subsidiary preferred stock dividends 0 0    
Net Earnings Available for PNM Common Stock (9,595) (3,380)    
Total Assets 243,572 237,517    
Goodwill 0 0    
Energy        
Segment Reporting Information, Profit (Loss) [Abstract]        
Electric operating revenues 544,077 444,118    
Cost of energy 241,686 168,414    
Utility margin 302,391 275,704    
Energy | PNM        
Segment Reporting Information, Profit (Loss) [Abstract]        
Cost of energy 209,853 138,814    
Energy | PNM        
Segment Reporting Information, Profit (Loss) [Abstract]        
Electric operating revenues 430,165 338,709    
Cost of energy 209,853 138,814    
Utility margin 220,312 199,895    
Energy | TNMP        
Segment Reporting Information, Profit (Loss) [Abstract]        
Electric operating revenues 113,912 105,409    
Cost of energy 31,833 29,600    
Utility margin 82,079 75,809    
Energy | Corporate and Other        
Segment Reporting Information, Profit (Loss) [Abstract]        
Electric operating revenues 0 0    
Cost of energy 0 0    
Utility margin $ 0 $ 0