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Segment Information - Summarized Financial Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
segment
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Apr. 01, 2018
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]            
Electric operating revenues $ 499,730 $ 426,540 $ 943,848 $ 791,247    
Other operating expenses 140,973 128,934 272,845 265,205    
Depreciation and amortization 76,769 70,727 152,533 140,601    
Operating income 86,392 74,203 154,460 117,369    
Interest income (loss) 3,327 3,578 7,619 7,137    
Other income (deductions) (40,285) 12,398 (64,769) 14,328    
Interest charges (29,217) (24,119) (55,437) (50,003)    
Earnings before Income Taxes 20,217 66,060 41,873 88,831    
Income taxes (benefit) 1,094 8,299 3,532 9,865    
Net Earnings (Loss) 19,123 57,761 38,341 78,966    
Valencia non-controlling interest (3,630) (3,920) (6,725) (7,414)    
Subsidiary preferred stock dividends (132) (132) (264) (264)    
Net Earnings (Loss) Available for PNM Common Stock 15,361 53,709 31,352 71,288    
Total Assets 8,911,105 8,120,469 8,911,105 8,120,469 $ 8,666,885  
Goodwill 278,297 278,297 $ 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 376,754 323,949 $ 715,463 595,162    
Depreciation and amortization 45,981 42,489 91,771 84,438    
Operating income 49,435 51,767 94,451 84,817    
Interest charges (14,523) (13,039) (29,095) (25,932)    
Earnings before Income Taxes (3,637) 53,248 4,724 78,244    
Income taxes (benefit) (1,182) 7,844 (359) 10,678    
Net Earnings (Loss) (2,455) 45,404 5,083 67,566    
Valencia non-controlling interest (3,630) (3,920) (6,725) (7,414)    
Subsidiary preferred stock dividends (132) (132) (264) (264)    
Net Earnings (Loss) Available for PNM Common Stock (6,217) 41,352 (1,906) 59,888    
Total Assets 6,090,151   6,090,151   6,060,133  
Goodwill 51,632   $ 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 122,976 102,591 $ 228,385 196,085    
Cost of energy 31,632 28,908 61,232 55,418    
Depreciation and amortization 24,312 22,475 47,954 44,665    
Operating income 38,000 24,704 62,242 41,729    
Interest charges (9,016) (8,277) (18,166) (16,752)    
Earnings before Income Taxes 30,212 17,472 47,423 27,084    
Income taxes (benefit) 4,161 1,822 6,312 2,699    
Net Earnings (Loss)     41,111 24,385    
Total Assets 2,583,602   2,583,602   2,364,772  
Goodwill 226,665   226,665   $ 226,665 $ 226,700
PNM            
Segment Reporting Information, Profit (Loss) [Abstract]            
Other operating expenses 117,374 105,925 226,463 213,253    
Depreciation and amortization 45,981 42,489 91,771 84,438    
Operating income 49,435 51,767 94,451 84,817    
Interest income (loss) 3,267 3,417 6,400 7,012    
Other income (deductions) (41,816) 11,103 (67,032) 12,347    
Interest charges (14,523) (13,039) (29,095) (25,932)    
Earnings before Income Taxes (3,637) 53,248 4,724 78,244    
Income taxes (benefit) (1,182) 7,844 (359) 10,678    
Net Earnings (Loss) (2,455) 45,404 5,083 67,566    
Valencia non-controlling interest (3,630) (3,920) (6,725) (7,414)    
Subsidiary preferred stock dividends (132) (132) (264) (264)    
Net Earnings (Loss) Available for PNM Common Stock (6,217) 41,352 (1,906) 59,888    
Total Assets 6,090,151 5,656,515 6,090,151 5,656,515    
Goodwill 51,632 51,632 51,632 51,632    
TNMP            
Segment Reporting Information, Profit (Loss) [Abstract]            
Other operating expenses 29,032 26,504 56,957 54,273    
Depreciation and amortization 24,312 22,475 47,954 44,665    
Operating income 38,000 24,704 62,242 41,729    
Interest income (loss) 105 0 1,287 0    
Other income (deductions) 1,123 1,045 2,060 2,107    
Interest charges (9,016) (8,277) (18,166) (16,752)    
Earnings before Income Taxes 30,212 17,472 47,423 27,084    
Income taxes (benefit) 4,161 1,822 6,312 2,699    
Net Earnings (Loss) 26,051 15,650 41,111 24,385    
Valencia non-controlling interest 0 0 0 0    
Subsidiary preferred stock dividends 0 0 0 0    
Net Earnings (Loss) Available for PNM Common Stock 26,051 15,650 41,111 24,385    
Total Assets 2,583,602 2,245,301 2,583,602 2,245,301    
Goodwill 226,665 226,665 226,665 226,665    
Corporate and Other            
Segment Reporting Information, Profit (Loss) [Abstract]            
Other operating expenses (5,433) (3,495) (10,575) (2,321)    
Depreciation and amortization 6,476 5,763 12,808 11,498    
Operating income (1,043) (2,268) (2,233) (9,177)    
Interest income (loss) (45) 161 (68) 125    
Other income (deductions) 408 250 203 (126)    
Interest charges (5,678) (2,803) (8,176) (7,319)    
Earnings before Income Taxes (6,358) (4,660) (10,274) (16,497)    
Income taxes (benefit) (1,885) (1,367) (2,421) (3,512)    
Net Earnings (Loss) (4,473) (3,293) (7,853) (12,985)    
Valencia non-controlling interest 0 0 0 0    
Subsidiary preferred stock dividends 0 0 0 0    
Net Earnings (Loss) Available for PNM Common Stock (4,473) (3,293) (7,853) (12,985)    
Total Assets 237,352 218,653 237,352 218,653    
Goodwill 0 0 0 0    
Energy            
Segment Reporting Information, Profit (Loss) [Abstract]            
Electric operating revenues 499,730 426,540 943,848 791,247    
Cost of energy 195,596 152,676 364,010 268,072    
Utility margin 304,134 273,864 579,838 523,175    
Energy | PNM            
Segment Reporting Information, Profit (Loss) [Abstract]            
Cost of energy 163,964 123,768 302,778 212,654    
Energy | PNM            
Segment Reporting Information, Profit (Loss) [Abstract]            
Electric operating revenues 376,754 323,949 715,463 595,162    
Cost of energy 163,964 123,768 302,778 212,654    
Utility margin 212,790 200,181 412,685 382,508    
Energy | TNMP            
Segment Reporting Information, Profit (Loss) [Abstract]            
Electric operating revenues 122,976 102,591 228,385 196,085    
Cost of energy 31,632 28,908 61,232 55,418    
Utility margin 91,344 73,683 167,153 140,667    
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