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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | $ 431,089 | $ 531,032
Alternative revenue programs | 5,293 | 4,759
Other electric operating revenue | 495 | 8,286
Electric Operating Revenues | 436,877 | 544,077
PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 305,714 | 414,554
Alternative revenue programs | 1,906 | 7,325
Other electric operating revenue | 495 | 8,286
Electric Operating Revenues | 308,115 | 430,165
TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 125,375 | 116,478
Alternative revenue programs | 3,387 | (2,566)
Other electric operating revenue | 0 | 0
Electric Operating Revenues | 128,762 | 113,912
Energy |  |
Disaggregation of Revenue [Line Items] |  |
Electric Operating Revenues | 436,877 | 544,077
Energy | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 161,880 | 156,251
Energy | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 134,882 | 132,792
Energy | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 34,625 | 32,243
Energy | Public authority |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 6,115 | 6,036
Energy | Economy energy service |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 7,563 | 9,309
Energy | PNM | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 120,385 | 119,885
Energy | PNM | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 99,338 | 98,062
Energy | PNM | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 24,769 | 19,478
Energy | PNM | Public authority |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 4,398 | 4,417
Energy | PNM | Economy energy service |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 7,563 | 9,309
Energy | TNMP | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 41,495 | 36,366
Energy | TNMP | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 35,544 | 34,730
Energy | TNMP | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 9,856 | 12,765
Energy | TNMP | Public authority |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 1,717 | 1,619
Energy | TNMP | Economy energy service |  |
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 | 71,958 | 79,065
Transmission | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 36,149 | 49,007
Transmission | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 35,809 | 30,058
Wholesale energy sales (1) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 11,690 | 112,986
Wholesale energy sales (1) | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 11,690 | 112,986
Wholesale energy sales (1) | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 0 | 0
Miscellaneous |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 2,376 | 2,350
Miscellaneous | PNM |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 1,422 | 1,410
Miscellaneous | TNMP |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | $ 954 | $ 940

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