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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | $ 303,351 | $ 297,191
Total Electric Operating Revenues | 317,878 | 330,178
PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 222,564 | 222,063
Total Electric Operating Revenues | 236,232 | 251,558
TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 80,787 | 75,128
Total Electric Operating Revenues | 81,646 | 78,620
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 126,435 |
Residential | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 97,169 |
Residential | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 29,266 |
Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 110,001 |
Commercial | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 82,849 |
Commercial | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 27,152 |
Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 17,764 |
Industrial | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 13,459 |
Industrial | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 4,305 |
Public authority |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 6,051 |
Public authority | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 4,635 |
Public authority | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 1,416 |
Economy energy service |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 7,288 |
Economy energy service | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 7,288 |
Economy energy service | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 0 |
Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 28,990 |
Transmission | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 12,482 |
Transmission | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 16,508 |
Miscellaneous |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 6,822 |
Miscellaneous | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 4,682 |
Miscellaneous | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 2,140 |
Other electric operating revenues |  |
Disaggregation of Revenue [Line Items] |  |
Total Electric Operating Revenues | 13,603 | 28,408
Other electric operating revenues | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total Electric Operating Revenues | 13,603 | 28,408
Other electric operating revenues | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total Electric Operating Revenues | 0 |
Alternative revenue programs |  |
Disaggregation of Revenue [Line Items] |  |
Total Electric Operating Revenues | 924 | 4,579
Alternative revenue programs | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total Electric Operating Revenues | 65 | 1,087
Alternative revenue programs | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total Electric Operating Revenues | $ 859 | $ 3,492

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