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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 368,893 $ 343,075 $ 715,478 $ 666,057
Alternative revenue programs 7,236 4,466 6,327 4,892
Other electric operating revenue 50,411 10,108 69,442 20,322
Revenues 426,540 357,649 791,247 691,271
PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 271,652 248,151 522,858 483,909
Alternative revenue programs 1,886 2,529 2,862 4,690
Other electric operating revenue 50,411 10,108 69,442 20,322
Revenues 323,949 260,788 595,162 508,921
TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 97,241 94,924 192,620 182,148
Alternative revenue programs 5,350 1,937 3,465 202
Other electric operating revenue 0 0 0 0
Revenues 102,591 96,861 196,085 182,350
Cost of energy        
Disaggregation of Revenue [Line Items]        
Revenues 426,540 357,649 791,247 691,271
Cost of energy | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 142,757 146,392 292,519 281,099
Cost of energy | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 137,554 121,470 248,917 236,504
Cost of energy | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 29,883 27,230 56,077 53,228
Cost of energy | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6,802 6,326 12,872 12,096
Cost of energy | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6,753 3,278 17,334 8,531
Cost of energy | PNM | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 108,090 109,090 222,759 211,899
Cost of energy | PNM | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 108,085 93,364 190,019 179,713
Cost of energy | PNM | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 22,837 20,373 41,737 39,838
Cost of energy | PNM | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 5,337 4,907 9,924 9,254
Cost of energy | PNM | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6,753 3,278 17,334 8,531
Cost of energy | TNMP | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 34,667 37,302 69,760 69,200
Cost of energy | TNMP | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 29,469 28,106 58,898 56,791
Cost of energy | TNMP | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7,046 6,857 14,340 13,390
Cost of energy | TNMP | Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,465 1,419 2,948 2,842
Cost of energy | TNMP | Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 40,610 34,335 79,234 66,514
Transmission | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 16,957 14,097 34,460 28,264
Transmission | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 23,653 20,238 44,774 38,250
Miscellaneous        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4,534 4,044 8,525 8,085
Miscellaneous | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3,593 3,042 6,625 6,410
Miscellaneous | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 941 $ 1,002 $ 1,900 $ 1,675