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Regulatory and Rate Matters - Renewable Portfolio Standard (Details) - Public Service Company of New Mexico $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 01, 2022 USD ($) | Jun. 01, 2021 USD ($) | Dec. 31, 2022 MW | Oct. 14, 2022 MW | Jul. 29, 2020 MW
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Solar distributed generation (in mw) |  |  |  | 200 | 650
Renewable Portfolio Standard |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Solar photovoltaic capacity (in mw) |  |  | 158 |  |
Solar distributed generation (in mw) |  |  | 239.1 |  |
Renewable energy rider, including excess return |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
NMPRC-approved return on equity |  |  | 0.50% |  |
NMPRC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Proposed revision to rider that will allow for recovery | $ | $ 61.0 | $ 66.9 |  |  |
New Mexico Wind | Renewable Portfolio Standard 2014 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Wind energy capacity (in mw) |  |  | 200 |  |
Red Mesa Wind | Renewable Portfolio Standard 2014 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Wind energy capacity (in mw) |  |  | 102 |  |
La Joya Wind | Renewable Portfolio Standard |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Wind energy capacity (in mw) |  |  | 140 |  |
Lightning Dock Geothermal | Renewable Portfolio Standard |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Geothermal energy capacity (in mw) |  |  | 11 |  |

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