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Electric Operating Revenues - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 21, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 03, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ 1,959,601 | $ 1,914,868 | $ 2,250,217 |
Alternative revenue programs |  | 8,815 | 6,607 | (19,485) |
Other electric operating revenue |  | 2,783 | 17,723 | 18,823 |
Total Electric Operating Revenues |  | 1,971,199 | 1,939,198 | 2,249,555 |
PVNGS leased interest |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Regulatory liabilities |  |  |  |  | $ 38,400
Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total Electric Operating Revenues |  | 1,971,199 | 1,939,198 | 2,249,555 |
Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 298,107 | 295,306 | 263,203 |
Wholesale energy sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 64,903 | 248,801 | 534,196 |
Miscellaneous |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 9,589 | 9,415 | 9,207 |
PNM |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,386,025 | 1,376,806 | 1,747,310 |
Alternative revenue programs |  | (9,720) | 9,419 | 692 |
Other electric operating revenue |  | 2,783 | 17,723 | 18,823 |
Total Electric Operating Revenues |  | 1,379,088 | 1,403,948 | 1,766,825 |
Regulatory liabilities |  | 552,272 | 699,867 |  |
PNM | Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 141,058 | 159,475 | 149,421 |
PNM | Wholesale energy sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 64,903 | 248,801 | 534,196 |
PNM | Miscellaneous |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 5,776 | 5,676 | 5,390 |
TNMP |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 573,576 | 538,062 | 502,907 |
Alternative revenue programs |  | 18,535 | (2,812) | (20,177) |
Other electric operating revenue |  | 0 | 0 | 0 |
Total Electric Operating Revenues |  | 592,111 | 535,250 | 482,730 |
Regulatory liabilities |  | 230,639 | 211,455 |  |
TNMP | Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 157,049 | 135,831 | 113,782 |
TNMP | Wholesale energy sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0 |
TNMP | Miscellaneous |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 3,813 | 3,739 | 3,817 |
PNMR and PNM | San Juan Generating Station | New Mexico Public Regulation Commission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total Electric Operating Revenues | $ (128,700) |  |  |  |
Regulatory liabilities | $ 128,700 |  |  |  |
Residential | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 744,808 | 616,401 | 672,650 |
Residential | PNM | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 541,581 | 425,448 | 484,699 |
Residential | TNMP | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 203,227 | 190,953 | 187,951 |
Commercial | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 627,169 | 547,218 | 576,222 |
Commercial | PNM | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 460,311 | 391,964 | 422,163 |
Commercial | TNMP | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 166,858 | 155,254 | 154,059 |
Industrial | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 159,054 | 135,592 | 122,021 |
Industrial | PNM | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 123,754 | 90,084 | 85,102 |
Industrial | TNMP | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 35,300 | 45,508 | 36,919 |
Public authority | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 30,490 | 27,795 | 27,709 |
Public authority | PNM | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 23,161 | 21,018 | 21,330 |
Public authority | TNMP | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 7,329 | 6,777 | 6,379 |
Economy energy service | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 25,481 | 34,340 | 45,009 |
Economy energy service | PNM | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 25,481 | 34,340 | 45,009 |
Economy energy service | TNMP | Electricity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ 0 | $ 0 | $ 0 |

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