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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 455,120 | $ 418,673 | $ 1,121,177 | $ 1,049,287
Alternative revenue programs | (12,376) | (6,779) | (7,484) | (300)
Other electric operating revenue | 29,721 | 21,692 | 50,043 | 64,471
Revenues | 472,465 | 433,586 | 1,163,736 | 1,113,458
PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 341,850 | 311,793 | 825,759 | 775,795
Alternative revenue programs | (7,067) | (2,372) | (2,377) | (1,617)
Other electric operating revenue | 29,721 | 21,692 | 50,043 | 64,471
Revenues | 364,504 | 331,113 | 873,425 | 838,649
TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 113,270 | 106,880 | 295,418 | 273,492
Alternative revenue programs | (5,309) | (4,407) | (5,107) | 1,317
Other electric operating revenue | 0 | 0 | 0 | 0
Revenues | 107,961 | 102,473 | 290,311 | 274,809
Cost of energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 472,465 | 433,586 | 1,163,736 | 1,113,458
Cost of energy | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 211,663 | 188,459 | 492,763 | 446,162
Cost of energy | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 156,491 | 152,744 | 392,995 | 392,432
Cost of energy | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 32,317 | 26,361 | 85,545 | 67,348
Cost of energy | Public authority |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 9,450 | 7,580 | 21,547 | 19,651
Cost of energy | Economy energy service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 3,270 | 5,731 | 11,802 | 18,677
Cost of energy | PNM | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 158,549 | 137,741 | 370,448 | 331,371
Cost of energy | PNM | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 125,414 | 121,702 | 305,127 | 305,903
Cost of energy | PNM | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 25,475 | 20,946 | 65,313 | 51,022
Cost of energy | PNM | Public authority |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 7,982 | 6,140 | 17,236 | 15,447
Cost of energy | PNM | Economy energy service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 3,270 | 5,731 | 11,802 | 18,677
Cost of energy | TNMP | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 53,114 | 50,718 | 122,315 | 114,791
Cost of energy | TNMP | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 31,077 | 31,042 | 87,868 | 86,529
Cost of energy | TNMP | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 6,842 | 5,415 | 20,232 | 16,326
Cost of energy | TNMP | Public authority |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 1,468 | 1,440 | 4,311 | 4,204
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 | 37,308 | 33,452 | 103,822 | 92,766
Transmission | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 17,463 | 16,068 | 45,727 | 43,794
Transmission | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 19,845 | 17,384 | 58,095 | 48,972
Miscellaneous |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 4,621 | 4,346 | 12,703 | 12,251
Miscellaneous | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 3,697 | 3,465 | 10,106 | 9,581
Miscellaneous | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 924 | $ 881 | $ 2,597 | $ 2,670

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