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Regulatory and Rate Matters - New Mexico General Rate Cases (Details) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 03, 2024 USD ($) | Dec. 08, 2023 USD ($) | Dec. 05, 2022 USD ($) lease MW | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Operating Revenues |  |  |  | $ 1,939,198 | $ 2,249,555 | $ 1,779,873
Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Non-fuel based rate increase | $ 15,300 |  |  |  |  |
Regulatory liabilities return period | 2 years |  |  |  |  |
Subsequent Event | PVNGS leased interest |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory liabilities | $ 38,400 |  |  |  |  |
Four Corners | Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Disallowance | $ 81,000 |  |  |  |  |
NM 2022 Rate Case |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested return on equity |  | 9.26% | 10.25% |  |  |
Requested equity capital structure, percentage |  | 49.61% |  |  |  |
Requested debt capital structure, percentage |  | 50.10% |  |  |  |
Requested preferred stock capital structure, percentage |  | 0.29% |  |  |  |
NM 2022 Rate Case | Palo Verde Nuclear Generating Station |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Impairment |  | $ 84,800 |  |  |  |
Approved regulatory asset |  | 51,300 |  |  |  |
Request regulatory asset |  | 96,300 |  |  |  |
Disallowance of return |  | 45,000 |  |  |  |
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] |  |  |  |  |  |
Operating Revenues |  |  |  | (38,400) |  |
2024 Rate Change | Subsequent Event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory liabilities return period | 2 years |  |  |  |  |
2024 Rate Change | Four Corners |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Disallowance |  |  |  | 55,500 |  |
2024 Rate Change | Palo Verde Nuclear Generating Station |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Disallowance |  |  |  | 8,200 |  |
PNM |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory liabilities |  |  |  | 699,867 | 564,902 |
Operating Revenues |  |  |  | $ 1,403,948 | $ 1,766,825 | $ 1,362,020
PNM | NM 2022 Rate Case |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Recovery of base rate |  |  | $ 2,700,000 |  |  |
Requested return on equity |  |  | 10.25% |  |  |
Revenue deficiency driver, years of operation |  |  | 6 years |  |  |
Leased PVNGS capacity, expiration (in megawatts) | MW |  |  | 114 |  |  |
Approved equity capital structure |  |  | 52.00% |  |  |
Approved debt capital structure |  |  | 48.00% |  |  |
Leases renewed | lease |  |  | 5 |  |  |
Number of megawatts purchased (in megawatts) | MW |  |  | 64.1 |  |  |
PNM | NM 2022 Rate Case | Non-Fuel Energy |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase |  | $ 6,100 | $ 63,800 |  |  |

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