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Segment Information - Schedule of Summarized Financial Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting Information [Line Items]      
Electric Operating Revenues $ 1,939,198 $ 2,249,555 $ 1,779,873
Utility margin 1,136,937 1,261,614 1,135,020
Other operating expenses 586,094 563,001 542,760
Depreciation and amortization 319,503 304,853 284,107
Operating income 231,340 393,760 308,153
Interest income 21,963 16,095 14,662
Other income (deductions) 27,581 (70,637) 18,491
Interest charges (190,355) (127,908) (96,877)
Earnings before Income Taxes 90,529 211,310 244,429
Income taxes (benefit) (16,350) 26,130 32,582
Net Earnings 106,879 185,180 211,847
Valencia non-controlling interest (18,533) (15,122) (15,490)
Preferred Stock Dividends Requirements (528) (528) (528)
Net Earnings Attributable to PNMR 87,818 169,530 195,829
Total Assets 10,252,605 9,257,377 8,666,885
Goodwill $ 278,297 278,297 278,297
PNM      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Utility margin $ 740,334 902,812 830,234
Other operating expenses 479,525 460,513 438,372
Depreciation and amortization 177,633 180,812 170,365
Operating income 83,176 261,487 221,497
Interest income 21,355 14,816 14,605
Other income (deductions) 20,003 (77,012) 13,809
Interest charges (86,574) (61,073) (51,360)
Earnings before Income Taxes 37,960 138,218 198,551
Income taxes (benefit) (16,758) 19,198 26,992
Net Earnings 54,718 119,020 171,559
Valencia non-controlling interest (18,533) (15,122) (15,490)
Preferred Stock Dividends Requirements (528) (528) (528)
Net Earnings Attributable to PNMR 35,657 103,370 155,541
Total Assets 6,813,065 6,272,166 6,060,133
Goodwill $ 51,632 51,632 51,632
TNMP      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Utility margin $ 396,603 358,802 304,786
Other operating expenses 133,443 124,519 114,228
Depreciation and amortization 113,142 98,316 90,440
Operating income 150,018 135,967 100,118
Interest income 0 0 0
Other income (deductions) 8,368 8,653 5,408
Interest charges (46,152) (37,192) (33,735)
Earnings before Income Taxes 112,234 107,428 71,791
Income taxes (benefit) 17,297 15,161 7,912
Net Earnings 94,937 92,267 63,879
Valencia non-controlling interest 0 0 0
Preferred Stock Dividends Requirements 0 0 0
Net Earnings Attributable to PNMR 94,937 92,267 63,879
Total Assets 3,145,031 2,746,601 2,364,772
Goodwill 226,665 226,665 226,665
Corporate and Other      
Segment Reporting Information [Line Items]      
Utility margin 0 0 0
Other operating expenses (26,874) (22,031) (9,840)
Depreciation and amortization 28,728 25,725 23,302
Operating income (1,854) (3,694) (13,462)
Interest income 608 1,279 57
Other income (deductions) (790) (2,278) (726)
Interest charges (57,629) (29,643) (11,782)
Earnings before Income Taxes (59,665) (34,336) (25,913)
Income taxes (benefit) (16,889) (8,229) (2,322)
Net Earnings (42,776) (26,107) (23,591)
Valencia non-controlling interest 0 0 0
Preferred Stock Dividends Requirements 0 0 0
Net Earnings Attributable to PNMR (42,776) (26,107) (23,591)
Total Assets 294,509 238,610 241,980
Goodwill 0 0 0
Electricity      
Segment Reporting Information [Line Items]      
Electric Operating Revenues 1,939,198 2,249,555 1,779,873
Cost of energy 802,261 987,941 644,853
Utility margin 1,136,937 1,261,614 1,135,020
Electricity | PNM      
Segment Reporting Information [Line Items]      
Electric Operating Revenues 1,403,948 1,766,825 1,362,020
Cost of energy 663,614 864,013 531,786
Utility margin 740,334 902,812 830,234
Electricity | TNMP      
Segment Reporting Information [Line Items]      
Electric Operating Revenues 535,250 482,730 417,853
Cost of energy 138,647 123,928 113,067
Utility margin 396,603 358,802 304,786
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