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Regulatory and Rate Matters - Integrated Resource Plan (Details) - portfolio |  |  | 12 Months Ended
--- | --- | --- | ---
May 04, 2016 | Jul. 01, 2014 | Dec. 31, 2017 | Dec. 31, 2016
NMPRC [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Period of action plan |  |  |  | 4 years
Public Service Company of New Mexico [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required filing of Integrated Resource Plan |  |  |  | 3 years
Planning period covered, IRP |  |  |  | 20 years
Public Service Company of New Mexico [Member] | Scenario, Forecast [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Planning period covered, IRP |  |  | 20 years |
Period of action plan |  |  | 4 years |
Number of resource portfolios (in portfolio) |  |  | 2 |
Public Service Company of New Mexico [Member] | Scenario, Forecast [Member] | San Juan Generating Station [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Number of continued operations resource portfolios (in portfolio) |  |  | 1 |
Number of discontinued operations resource portfolios (in portfolio) |  |  | 1 |
Public Service Company of New Mexico [Member] | NMPRC [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Period of action plan |  | 4 years |  |
Period of time to show good cause why a docket should remain open | 30 days |  |  |

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