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Regulatory and Rate Matters - 2024 Rate Change (Narrative) (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 03, 2024 USD ($) | Dec. 05, 2022 USD ($) lease MW | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Non-fuel based rate increase | $ 15,300 |  |  |  |
Regulatory liabilities return period | 2 years |  |  | 2 years |
Revenues |  |  | $ (1,971,199) | $ (1,939,198) | $ (2,249,555)
PVNGS leased interest |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory liabilities | $ 38,400 |  |  |  |
Four Corners |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Disallowance | $ 81,000 |  |  |  |
NMPRC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested return on equity |  | 10.25% |  |  |
PNM |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Leases renewed | lease |  | 5 |  |  |
Number of megawatts purchased (in megawatts) | MW |  | 64.1 |  |  |
Regulatory liabilities |  |  | 552,272 | 699,867 |
Revenues |  |  | $ (1,379,088) | (1,403,948) | $ (1,766,825)
2024 Rate Change |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory liabilities |  |  |  | 19,200 |
Deferred regulatory liability |  |  |  | 19,200 |
2024 Rate Change | PVNGS leased interest |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Revenues |  |  |  | 38,400 |
2024 Rate Change | Four Corners |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Disallowance |  |  |  | 55,500 |
2024 Rate Change | PVNGS (Nuclear) |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Disallowance |  |  |  | $ 8,200 |
2024 Rate Change | PNM |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Recovery of base rate |  | $ 2,700,000 |  |  |
2024 Rate Change | PNM | Non-Fuel Energy |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested rate increase (decrease) |  | $ 63,800 |  |  |
NM 2024 Rate Case |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested return on equity | 9.26% |  |  |  |
Requested equity capital structure, percentage | 49.61% |  |  |  |
Requested debt capital structure, percentage | 50.10% |  |  |  |
Requested preferred stock capital structure, percentage | 0.29% |  |  |  |
NM 2024 Rate Case | PVNGS (Nuclear) |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved regulatory asset | $ 51,300 |  |  |  |
Request regulatory asset | 96,300 |  |  |  |
Disallowance of return | $ 45,000 |  |  |  |

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