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Regulatory and Rate Matters - Renewable Portfolio Standard (Details) - Public Service Company of New Mexico [Member] - MW | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Renewable Portfolio Standard [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Solar photovoltaic capacity (in mw) | 107 | 40 | 23 |
Current output of solar photovoltaic capacity (in mw) |  |  | 4 |
Solar distributed generation (in mw) | 62.7 |  |  |
Renewable Portfolio Standard [Member] | Minimum [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Reasonable cost threshold | 3.00% |  |  |
Renewable Portfolio Standard [Member] | Minimum [Member] | Wind [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required percentage of diversification | 30.00% |  |  |
Renewable Portfolio Standard [Member] | Minimum [Member] | Solar [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required percentage of diversification | 20.00% |  |  |
Renewable Portfolio Standard [Member] | Minimum [Member] | Distributed Generation [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required percentage of diversification | 3.00% |  |  |
Renewable Portfolio Standard [Member] | Minimum [Member] | Other [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required percentage of diversification | 5.00% |  |  |
Renewable Portfolio Standard [Member] | Required Percentage by 2011 [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required percentage of renewable energy in portfolio to electric sales | 10.00% |  |  |
Renewable Portfolio Standard [Member] | Required Percentage by 2015 [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required percentage of renewable energy in portfolio to electric sales | 15.00% |  |  |
Renewable Portfolio Standard [Member] | Required Percentage by 2020 [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required percentage of renewable energy in portfolio to electric sales | 20.00% |  |  |
Renewable Portfolio Standard Supplemental Procurement [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Solar photovoltaic capacity (in mw) |  |  |  | 1.5
Renewable Portfolio Standard 2014 [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Wind energy capacity (in mw) | 204 | 102 |  |
Wind capacity, planned purchase agreement, term |  | 20 years |  |

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