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Electric Operating Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | $ 1,914,868 | $ 2,250,217 | $ 1,744,681
Alternative revenue programs | 6,607 | (19,485) | (3,764)
Other electric operating revenue | 17,723 | 18,823 | 38,956
Electric Operating Revenues | 1,939,198 | 2,249,555 | 1,779,873
Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Electric Operating Revenues | 1,939,198 | 2,249,555 | 1,779,873
Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 295,306 | 263,203 | 182,032
Miscellaneous |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 9,415 | 9,207 | 8,564
Wholesale energy sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 248,801 | 534,196 | 184,132
PNM |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 1,376,806 | 1,747,310 | 1,327,172
Alternative revenue programs | 9,419 | 692 | (4,108)
Other electric operating revenue | 17,723 | 18,823 | 38,956
Electric Operating Revenues | 1,403,948 | 1,766,825 | 1,362,020
PNM | Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 159,475 | 149,421 | 87,880
PNM | Miscellaneous |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 5,676 | 5,390 | 4,770
PNM | Wholesale energy sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 248,801 | 534,196 | 184,132
TNMP |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 538,062 | 502,907 | 417,509
Alternative revenue programs | (2,812) | (20,177) | 344
Other electric operating revenue | 0 | 0 | 0
Electric Operating Revenues | 535,250 | 482,730 | 417,853
TNMP | Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 135,831 | 113,782 | 94,152
TNMP | Miscellaneous |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 3,739 | 3,817 | 3,794
TNMP | Wholesale energy sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 0 | 0 | 0
Residential | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 616,401 | 672,650 | 643,516
Residential | PNM | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 425,448 | 484,699 | 484,720
Residential | TNMP | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 190,953 | 187,951 | 158,796
Commercial | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 547,218 | 576,222 | 544,787
Commercial | PNM | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 391,964 | 422,163 | 419,251
Commercial | TNMP | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 155,254 | 154,059 | 125,536
Industrial | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 135,592 | 122,021 | 117,568
Industrial | PNM | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 90,084 | 85,102 | 88,479
Industrial | TNMP | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 45,508 | 36,919 | 29,089
Public authority | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 27,795 | 27,709 | 28,862
Public authority | PNM | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 21,018 | 21,330 | 22,720
Public authority | TNMP | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 6,777 | 6,379 | 6,142
Economy energy service | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 34,340 | 45,009 | 35,220
Economy energy service | PNM | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | 34,340 | 45,009 | 35,220
Economy energy service | TNMP | Electricity |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts with customers | $ 0 | $ 0 | $ 0

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