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Regulatory and Rate Matters - Renewable Energy Rider (Details) - Public Service Company of New Mexico - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 | Jun. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Renewable Energy Rider |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Revenue from renewable energy rider |  |  | $ 56.4 | $ 52.0 | $ 41.4
Renewable Energy Rider | NMPRC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Proposed revision to rider that will allow for recovery |  | $ 67.8 |  |  |
Renewable Energy Rider | NMPRC | Subsequent Event |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Proposed revision to rider that will allow for recovery | $ 67.8 |  |  |  |
Renewable energy procurement plan, approved recovery amount | 65.5 |  |  |  |
Renewable Energy Rider | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
NMPRC-approved return on equity |  |  | 0.50% |  |
Renewable Energy Rider, Sky Blue Energy Program | NMPRC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Proposed revision to rider that will allow for recovery |  | $ 2.3 |  |  |
Renewable Energy Rider, Sky Blue Energy Program | NMPRC | Subsequent Event |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Proposed revision to rider that will allow for recovery | $ 2.3 |  |  |  |

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