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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | $ 315,698 | $ 303,351
Revenues | 349,645 | 317,878
PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 235,941 | 222,564
Revenues | 269,318 | 236,232
TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 79,757 | 80,787
Revenues | 80,327 | 81,646
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 137,734 | 126,435
Residential | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 107,302 | 97,169
Residential | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 30,432 | 29,266
Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 112,662 | 110,001
Commercial | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 85,233 | 82,849
Commercial | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 27,429 | 27,152
Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 20,363 | 17,764
Industrial | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 14,747 | 13,459
Industrial | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 5,616 | 4,305
Public authority |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 6,085 | 6,051
Public authority | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 4,711 | 4,635
Public authority | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 1,374 | 1,416
Economy energy service |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 6,922 | 7,288
Economy energy service | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 6,922 | 7,288
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 | 27,388 | 28,990
Transmission | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 13,385 | 12,482
Transmission | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 14,003 | 16,508
Miscellaneous |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 4,544 | 6,822
Miscellaneous | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 3,641 | 4,682
Miscellaneous | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 903 | 2,140
Alternative revenue programs |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 636 | 924
Alternative revenue programs | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 66 | 65
Alternative revenue programs | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 570 | 859
Other electric operating revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 33,311 | 13,603
Other electric operating revenues | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 33,311 | 13,603
Other electric operating revenues | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 0 | $ 0

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