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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

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