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Segment Information - Schedule (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]      
Electric operating revenues $ 1,779,873 $ 1,523,012 $ 1,457,603
Other operating expenses 542,760 514,878 632,783
Depreciation and amortization 284,107 275,612 267,808
Operating income 308,153 285,281 144,200
Interest income 14,662 14,223 14,022
Other income (deductions) 18,491 22,840 29,643
Interest charges (96,877) (114,392) (121,016)
Earnings before Income Taxes 244,429 207,952 66,849
Income taxes (benefit) 32,582 20,636 (25,282)
Net Earnings 211,847 187,316 92,131
Valencia non-controlling interest (15,490) (14,013) (14,241)
Subsidiary preferred stock dividends (528) (528) (528)
Net Earnings Attributable to PNMR 195,829 172,775 77,362
Total Assets 8,666,885 7,939,854 7,298,774
Goodwill $ 278,297 278,297 278,297
PNM      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Other operating expenses $ 438,372 414,445 554,661
Depreciation and amortization 170,365 165,325 160,368
Operating income 221,497 214,897 61,068
Interest income 14,605 14,469 14,303
Other income (deductions) 13,809 17,120 26,989
Interest charges (51,360) (64,615) (72,900)
Earnings before Income Taxes 198,551 181,871 29,460
Income taxes (benefit) 26,992 21,857 (25,962)
Net Earnings 171,559 160,014 55,422
Valencia non-controlling interest (15,490) (14,013) (14,241)
Subsidiary preferred stock dividends (528) (528) (528)
Net Earnings Attributable to PNMR 155,541 145,473 40,653
Total Assets 6,060,133 5,581,033 5,242,991
Goodwill $ 51,632 51,632 51,632
TNMP      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Other operating expenses $ 114,228 104,852 98,621
Depreciation and amortization 90,440 87,799 84,259
Operating income 100,118 88,453 85,814
Interest income 0 0 0
Other income (deductions) 5,408 6,828 4,131
Interest charges (33,735) (30,388) (29,100)
Earnings before Income Taxes 71,791 64,893 60,845
Income taxes (benefit) 7,912 6,308 5,046
Net Earnings 63,879 58,585 55,799
Valencia non-controlling interest 0 0 0
Subsidiary preferred stock dividends 0 0 0
Net Earnings Attributable to PNMR 63,879 58,585 55,799
Total Assets 2,364,772 2,132,580 1,860,439
Goodwill 226,665 226,665 226,665
Corporate and Other      
Segment Reporting Information [Line Items]      
Other operating expenses (9,840) (4,419) (20,499)
Depreciation and amortization 23,302 22,488 23,181
Operating income (13,462) (18,069) (2,682)
Interest income 57 (246) (281)
Other income (deductions) (726) (1,108) (1,477)
Interest charges (11,782) (19,389) (19,016)
Earnings before Income Taxes (25,913) (38,812) (23,456)
Income taxes (benefit) (2,322) (7,529) (4,366)
Net Earnings (23,591) (31,283) (19,090)
Valencia non-controlling interest 0 0 0
Subsidiary preferred stock dividends 0 0 0
Net Earnings Attributable to PNMR (23,591) (31,283) (19,090)
Total Assets 241,980 226,241 195,344
Goodwill 0 0 0
Electricity      
Segment Reporting Information [Line Items]      
Electric operating revenues 1,779,873 1,523,012 1,457,603
Cost of energy 644,853 447,241 412,812
Utility margin 1,135,020 1,075,771 1,044,791
Electricity | PNM      
Segment Reporting Information [Line Items]      
Electric operating revenues 1,362,020 1,139,834 1,093,822
Cost of energy 531,786 345,167 317,725
Utility margin 830,234 794,667 776,097
Electricity | TNMP      
Segment Reporting Information [Line Items]      
Electric operating revenues 417,853 383,178 363,781
Cost of energy 113,067 102,074 95,087
Utility margin 304,786 281,104 268,694
Electricity | Corporate and Other      
Segment Reporting Information [Line Items]      
Electric operating revenues 0 0 0
Cost of energy 0 0 0
Utility margin $ 0 $ 0 $ 0