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Regulatory and Rate Matters - SJGS Abandonment Application (Details) $ in Millions |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2022 USD ($) | Jun. 17, 2022 USD ($) | Jul. 10, 2019 proceeding | Jul. 01, 2019 USD ($) | Dec. 31, 2022 USD ($) | Oct. 14, 2022 MW | Dec. 31, 2021 USD ($) | Jul. 29, 2020 MW | Mar. 31, 2020 USD ($) | Mar. 30, 2020 USD ($) | Feb. 21, 2020 USD ($)
Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory disallowance and festructuring costs |  |  |  |  | $ 1.6 |  |  |  |  |  |
Solar distributed generation (in mw) | MW |  |  |  |  |  | 200 |  | 650 |  |  |
Number of megawatts in battery storage facilities (in megawatts) | MW |  |  |  |  |  | 100 |  | 300 |  |  |
Payments for legal settlements | $ 19.8 |  |  |  |  |  |  |  |  |  |
Public Utilities, Loss Contingency |  |  |  |  | 28.7 |  |  |  |  |  |
San Juan Generating Station |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  | 6.6 |  |  |  |  |  |
Severance |  |  |  |  | 8.9 |  |  |  |  |  |
San Juan Generating Station | Other deferred credits |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  |  |  | 37.2 |  | $ 36.9 |  |  |  |
San Juan Generating Station | Employee Severance |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  |  |  | 0.7 |  |  |  | $ 9.4 |  |
San Juan Generating Station | Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Request issuance of energy transition bonds |  |  |  | $ 361.0 |  |  |  |  |  |  |
Forecasted undepreciated investment |  |  |  |  | 283.0 |  |  |  |  |  | $ 361.0
Plant decommissioning and coal mine reclamation costs |  |  |  |  | 28.6 |  |  |  |  |  |
Upfront financing costs |  |  |  |  | 9.6 |  |  |  |  |  |
Severance costs |  |  |  |  | 20.0 |  |  |  |  |  |
Proceeds from securitization bonds |  |  |  | $ 19.8 |  |  |  |  |  |  |
Number of proceedings | proceeding |  |  | 2 |  |  |  |  |  |  |  |
San Juan Generating Station | Public Service Company of New Mexico | Other deferred credits |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  |  |  |  |  | 36.0 |  |  |  |
San Juan Generating Station | Public Service Company of New Mexico | Deferred Regulatory Asset |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  |  |  |  |  | $ 36.9 |  |  |  |
San Juan Generating Station | Public Service Company of New Mexico | Employee Severance |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  |  |  |  |  |  |  | $ 8.1 |  |
San Juan Generating Station | Public Service Company of New Mexico | Other Restructuring |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  |  |  |  |  |  |  |  | $ 8.9 |
San Juan Generating Station | Public Service Company of New Mexico | Economic Development and Workforce Training Costs |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  |  |  | $ 19.8 |  |  |  |  | $ 19.8 |
San Juan Generation Station, Unit 1 | Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual rate credits |  | $ 21.1 |  |  |  |  |  |  |  |  |
San Juan Generating Station, Unit 4 | Public Service Company of New Mexico |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual rate credits |  | $ 98.3 |  |  |  |  |  |  |  |  |
Number of days to transfer payment |  | 30 days |  |  |  |  |  |  |  |  |

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