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Construction Program and Jointly-Owned Electric Generating Plants - Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2024 MW | Jan. 31, 2023 MW | Dec. 31, 2024 USD ($) generatingUnit | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | $ 1,247,041 | $ 1,075,812 | $ 912,557
PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | 682,412 | 565,080 | 433,459
TNMP |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | 541,604 | $ 464,436 | $ 449,534
Joint Projects | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | 682,400 |  |
Joint Projects | TNMP |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | 541,600 |  |
Joint Projects | TXNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Construction expenditures |  |  | $ 1,247,000 |  |
PVNGS (Nuclear) | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Number of units (in generating units) | generatingUnit |  |  | 3 |  |
Composite Interest | 7.30% |  | 7.29% | 7.60% |
Leased capacity | MW | 10 | 104 |  |  |
PVNGS, Unit One | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Composite Interest |  |  | 2.30% |  |
PVNGS, Unit Two | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Composite Interest |  |  | 9.40% |  |
PVNGS, Unit Three | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Composite Interest |  |  | 10.20% |  |
Four Corners | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Number of units (in generating units) | generatingUnit |  |  | 2 |  |
Four Corners Units 4 and 5 (Coal) | PNM |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Composite Interest |  |  | 13.00% |  |

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