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Electric Operating Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | $ 1,359,740 | $ 1,321,023 | $ 1,277,594
Operating Revenues | 1,436,613 | 1,445,003 | 1,362,951
Residential Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 563,297 |  |
Commercial Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 519,594 |  |
Industrial Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 78,436 |  |
Public Authority Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 27,297 |  |
Economy Energy Service Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 26,764 |  |
Electric Transmission Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 121,271 |  |
Miscellaneous Revenue From Contracts With Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 23,081 |  |
Alternative Energy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 1,756 | 15,779 | 16,035
Other Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 75,117 | 108,201 | 69,322
Public Service Company of New Mexico |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 1,019,291 | 992,462 | 963,158
Operating Revenues | 1,091,965 | 1,104,230 | 1,035,913
Public Service Company of New Mexico | Residential Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 433,009 |  |
Public Service Company of New Mexico | Commercial Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 408,333 |  |
Public Service Company of New Mexico | Industrial Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 61,119 |  |
Public Service Company of New Mexico | Public Authority Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 21,688 |  |
Public Service Company of New Mexico | Economy Energy Service Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 26,764 |  |
Public Service Company of New Mexico | Electric Transmission Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 54,280 |  |
Public Service Company of New Mexico | Miscellaneous Revenue From Contracts With Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 14,098 |  |
Public Service Company of New Mexico | Alternative Energy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | (2,443) | 3,567 | 3,433
Public Service Company of New Mexico | Other Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 75,117 | 108,201 | 69,322
Texas-New Mexico Power Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 340,449 | 328,561 | 314,436
Operating Revenues | 344,648 | 340,773 | 327,038
Texas-New Mexico Power Company | Residential Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 130,288 |  |
Texas-New Mexico Power Company | Commercial Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 111,261 |  |
Texas-New Mexico Power Company | Industrial Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 17,317 |  |
Texas-New Mexico Power Company | Public Authority Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 5,609 |  |
Texas-New Mexico Power Company | Economy Energy Service Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 0 |  |
Texas-New Mexico Power Company | Electric Transmission Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 66,991 |  |
Texas-New Mexico Power Company | Miscellaneous Revenue From Contracts With Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 8,983 |  |
Texas-New Mexico Power Company | Alternative Energy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | 4,199 | $ 12,212 | $ 12,602
Texas-New Mexico Power Company | Other Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Revenues | $ 0 |  |

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