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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 338,659 | $ 326,586 | $ 642,010 | $ 623,777
Revenues | 352,313 | 362,320 | 670,191 | 692,498
PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 254,728 | 246,402 | 477,291 | 468,465
Revenues | 264,511 | 276,097 | 500,742 | 527,655
TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 83,931 | 80,184 | 164,719 | 155,312
Revenues | 87,802 | 86,223 | 169,449 | 164,843
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 130,823 |  | 257,257 |
Residential | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 99,508 |  | 196,676 |
Residential | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 31,315 |  | 60,581 |
Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 138,734 |  | 248,735 |
Commercial | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 110,652 |  | 193,501 |
Commercial | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 28,082 |  | 55,234 |
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 18,781 |  | 36,545 |
Industrial | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 14,597 |  | 28,056 |
Industrial | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 4,184 |  | 8,489 |
Public authority |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 6,619 |  | 12,670 |
Public authority | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 5,220 |  | 9,855 |
Public authority | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 1,399 |  | 2,815 |
Economy energy service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 6,378 |  | 13,666 |
Economy energy service | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 6,378 |  | 13,666 |
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 | 30,851 |  | 59,841 |
Transmission | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 14,108 |  | 26,590 |
Transmission | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 16,743 |  | 33,251 |
Miscellaneous |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 6,473 |  | 13,296 |
Miscellaneous | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 4,265 |  | 8,947 |
Miscellaneous | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 2,208 |  | 4,349 |
Alternative revenue programs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,660 | 8,920 | 6,584 | 13,499
Alternative revenue programs | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,789 | 2,881 | 1,854 | 3,968
Alternative revenue programs | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,871 | 6,039 | 4,730 | 9,531
Other electric operating revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,994 | 26,814 | 21,597 | 55,222
Other electric operating revenues | PNM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,994 | $ 26,814 | 21,597 | $ 55,222
Other electric operating revenues | TNMP |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0 |  | $ 0 |

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