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Regulatory and Rate Matters - Integrated Resource Plan (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 03, 2017 | May 04, 2016 | Sep. 30, 2019 | Dec. 31, 2019
NMPRC |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Period of action plan |  |  |  | 4 years
Public Service Company of New Mexico |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required filing of Integrated Resource Plan |  |  |  | 3 years
Period of action plan |  |  |  | 4 years
Public Service Company of New Mexico | NMPRC |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Period of time to show good cause why a docket should remain open |  | 30 days |  |
Integrated Resource Plan, 2011 | Public Service Company of New Mexico |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Planning period covered, IRP |  |  |  | 20 years
Integrated Resource Plan, 2017 | Public Service Company of New Mexico |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Planning period covered, IRP | 20 years |  |  |
Integrated Resource Plan, 2020 | Public Service Company of New Mexico |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Planning period covered, IRP |  |  | 20 years |

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