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Regulatory and Rate Matters - FERC Compliance (Details) $ in Millions |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 21, 2022 USD ($) | Jul. 29, 2022 filedPetition | Jul. 18, 2022 denialNotice | Jun. 16, 2022 USD ($) numberOfAMIMeter proceeding | May 17, 2022 delegatedLetterOrder | Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Number of delegated letter orders | delegatedLetterOrder |  |  |  |  | 2 |
Number of requests for rehearing | numberOfAMIMeter |  |  |  | 2 |  |
Number of FERC proceedings | proceeding |  |  |  | 2 |  |
Number of rehearing denial notices | denialNotice |  |  | 2 |  |  |
Number of petitions filed for review | filedPetition |  | 2 |  |  |  |
Public Service Company of New Mexico |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Compliance extension period |  |  |  | 75 days |  |
Compliance extension period, repost period |  |  |  | 30 days |  |
Time-value refunds | $ 8.1 |  |  |  |  |
Payment of time-value refunds |  |  |  |  |  | $ 8.1
Public Service Company of New Mexico | FERC Proceedings One |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Time-value customer refund |  |  |  | $ 7.0 |  |
Public Service Company of New Mexico | FERC Proceedings Two |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Time-value customer refund |  |  |  | $ 28.0 |  |

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