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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | $ 322,983 | $ 315,698
Alternative revenue programs | 426 | 636
Other electric operating revenue | 10,213 | 33,311
Revenues | 333,622 | 349,645
PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 235,759 | 235,941
Alternative revenue programs | 2,161 | 66
Other electric operating revenue | 10,213 | 33,311
Revenues | 248,133 | 269,318
TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 87,224 | 79,757
Alternative revenue programs | (1,735) | 570
Other electric operating revenue | 0 | 0
Revenues | 85,489 | 80,327
Cost of energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 333,622 | 349,645
Cost of energy | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 134,707 | 137,734
Cost of energy | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 115,034 | 112,662
Cost of energy | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 25,999 | 20,363
Cost of energy | Public authority |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 5,770 | 6,085
Cost of energy | Economy energy service |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 5,253 | 6,922
Cost of energy | PNM | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 102,809 | 107,302
Cost of energy | PNM | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 86,349 | 85,233
Cost of energy | PNM | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 19,466 | 14,747
Cost of energy | PNM | Public authority |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 4,347 | 4,711
Cost of energy | PNM | Economy energy service |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 5,253 | 6,922
Cost of energy | TNMP | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 31,898 | 30,432
Cost of energy | TNMP | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 28,685 | 27,429
Cost of energy | TNMP | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 6,533 | 5,616
Cost of energy | TNMP | Public authority |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 1,423 | 1,374
Cost of energy | TNMP | Economy energy service |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 0 | 0
Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 32,179 | 27,388
Transmission | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 14,167 | 13,385
Transmission | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 18,012 | 14,003
Miscellaneous |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 4,041 | 4,544
Miscellaneous | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 3,368 | 3,641
Miscellaneous | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | $ 673 | $ 903

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