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Segment Information - Schedule (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]                      
Operating Revenues $ 359,276 $ 472,465 $ 357,649 $ 333,622 $ 344,144 $ 433,586 $ 330,228 $ 349,645 $ 1,523,012 $ 1,457,603 $ 1,436,613
Other operating expenses                 514,878 632,783 559,652
Depreciation and amortization                 275,612 267,808 241,188
Operating income 18,588 147,805 71,150 47,738 60,552 140,540 (93,615) 36,723 285,281 144,200 236,047
Interest income                 14,223 14,022 15,540
Other income (deductions)                 22,840 29,643 (15,286)
Interest charges                 (114,392) (121,016) (127,244)
Earnings before Income Taxes                 207,952 66,849 109,057
Income taxes (benefit)                 20,636 (25,282) 7,775
Net Earnings 11,701 $ 125,453 $ 61,561 $ (11,399) 35,989 $ 106,763 $ (72,283) $ 21,662 187,316 92,131 101,282
Valencia non-controlling interest                 (14,013) (14,241) (15,112)
Subsidiary preferred stock dividends                 (528) (528) (528)
Net Earnings Attributable to PNMR                 172,775 77,362 85,642
Total Assets 7,939,854       7,298,774       7,939,854 7,298,774 6,865,551
Goodwill 278,297       278,297       $ 278,297 278,297 278,297
PNM                      
Segment Reporting Information [Line Items]                      
Number of operating segments | segment                 1    
Other operating expenses                 $ 414,445 554,661 481,030
Depreciation and amortization                 165,325 160,368 151,866
Operating income                 214,897 61,068 145,033
Interest income                 14,469 14,303 13,089
Other income (deductions)                 17,120 26,989 (17,312)
Interest charges                 (64,615) (72,900) (76,458)
Earnings before Income Taxes                 181,871 29,460 64,352
Income taxes (benefit)                 21,857 (25,962) (5,971)
Net Earnings                 160,014 55,422 70,323
Valencia non-controlling interest                 (14,013) (14,241) (15,112)
Subsidiary preferred stock dividends                 (528) (528) (528)
Net Earnings Attributable to PNMR                 145,473 40,653 54,683
Total Assets 5,581,033       5,242,991       5,581,033 5,242,991 5,035,883
Goodwill 51,632       51,632       $ 51,632 51,632 51,632
TNMP                      
Segment Reporting Information [Line Items]                      
Number of operating segments | segment                 1    
Other operating expenses                 $ 104,852 98,621 96,272
Depreciation and amortization                 87,799 84,259 66,189
Operating income                 88,453 85,814 96,497
Interest income                 0 0 0
Other income (deductions)                 6,828 4,131 4,065
Interest charges                 (30,388) (29,100) (32,091)
Earnings before Income Taxes                 64,893 60,845 68,471
Income taxes (benefit)                 6,308 5,046 16,880
Net Earnings                 58,585 55,799 51,591
Valencia non-controlling interest                 0 0 0
Subsidiary preferred stock dividends                 0 0 0
Net Earnings Attributable to PNMR                 58,585 55,799 51,591
Total Assets 2,132,580       1,860,439       2,132,580 1,860,439 1,665,177
Goodwill 226,665       226,665       226,665 226,665 226,665
Corporate and Other                      
Segment Reporting Information [Line Items]                      
Other operating expenses                 (4,419) (20,499) (17,650)
Depreciation and amortization                 22,488 23,181 23,133
Operating income                 (18,069) (2,682) (5,483)
Interest income                 (246) (281) 2,451
Other income (deductions)                 (1,108) (1,477) (2,039)
Interest charges                 (19,389) (19,016) (18,695)
Earnings before Income Taxes                 (38,812) (23,456) (23,766)
Income taxes (benefit)                 (7,529) (4,366) (3,134)
Net Earnings                 (31,283) (19,090) (20,632)
Valencia non-controlling interest                 0 0 0
Subsidiary preferred stock dividends                 0 0 0
Net Earnings Attributable to PNMR                 (31,283) (19,090) (20,632)
Total Assets 226,241       195,344       226,241 195,344 164,491
Goodwill $ 0       $ 0       0 0 0
Electricity                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 1,523,012 1,457,603 1,436,613
Cost of energy                 447,241 412,812 399,726
Utility margin                 1,075,771 1,044,791 1,036,887
Electricity | PNM                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 1,139,834 1,093,822 1,091,965
Cost of energy                 345,167 317,725 314,036
Utility margin                 794,667 776,097 777,929
Electricity | TNMP                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 383,178 363,781 344,648
Cost of energy                 102,074 95,087 85,690
Utility margin                 281,104 268,694 258,958
Electricity | Corporate and Other                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 0 0 0
Cost of energy                 0 0 0
Utility margin                 $ 0 $ 0 $ 0