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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 400,023 | $ 392,607 | $ 1,042,033 | $ 1,016,384
Revenues | 422,666 | 419,900 | 1,092,857 | 1,112,398
PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 306,019 | 300,604 | 783,310 | 769,069
Revenues | 331,374 | 327,254 | 832,116 | 854,909
TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 94,004 | 92,003 | 258,723 | 247,315
Revenues | 91,292 | 92,646 | 260,741 | 257,489
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 178,318 |  | 435,575 |
Residential | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 138,091 |  | 334,767 |
Residential | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 40,227 |  | 100,808 |
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 150,605 |  | 399,340 |
Commercial | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 121,755 |  | 315,256 |
Commercial | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 28,850 |  | 84,084 |
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 22,321 |  | 58,867 |
Industrial | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 17,919 |  | 45,976 |
Industrial | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 4,402 |  | 12,891 |
Public authority |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 8,262 |  | 20,931 |
Public authority | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 6,872 |  | 16,726 |
Public authority | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 1,390 |  | 4,205 |
Economy energy service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 6,158 |  | 19,825 |
Economy energy service | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 6,158 |  | 19,825 |
Economy energy service | TNMP |  |  |  |
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 | 30,281 |  | 90,123 |
Transmission | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 13,538 |  | 40,128 |
Transmission | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 16,743 |  | 49,995 |
Miscellaneous |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 4,078 |  | 17,372 |
Miscellaneous | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 1,686 |  | 10,632 |
Miscellaneous | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 2,392 |  | 6,740 |
Alternative revenue programs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (8,050) | (1,908) | (1,466) | 11,591
Alternative revenue programs | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (5,338) | (2,551) | (3,484) | 1,417
Alternative revenue programs | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (2,712) | 643 | 2,018 | 10,174
Other electric operating revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,693 | 29,201 | 52,290 | 84,423
Other electric operating revenues | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,693 | $ 29,201 | 52,290 | $ 84,423
Other electric operating revenues | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0 |  | $ 0 |

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