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Regulatory and Rate Matters - Renewable Portfolio Standard (Details) - Public Service Company of New Mexico | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 MW | Dec. 31, 2016 MW | Jun. 01, 2017 GWh MW | Dec. 31, 2015 MW | Dec. 31, 2013 MW
Renewable Portfolio Standard |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Solar photovoltaic capacity (in mw) | 107 |  |  | 40 |
Current output of solar photovoltaic capacity (in mw) | 4 |  |  |  |
Solar distributed generation (in mw) | 81.6 |  |  |  |
Renewable Portfolio Standard | Minimum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Reasonable cost threshold | 3.00% |  |  |  |
Renewable Portfolio Standard | Minimum | Wind |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Required percentage of diversification | 30.00% |  |  |  |
Renewable Portfolio Standard | Minimum | Solar |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Required percentage of diversification | 20.00% |  |  |  |
Renewable Portfolio Standard | Minimum | Distributed Generation |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Required percentage of diversification | 3.00% |  |  |  |
Renewable Portfolio Standard | Minimum | Other |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Required percentage of diversification | 5.00% |  |  |  |
Renewable Portfolio Standard | Required Percentage by 2011 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Required percentage of renewable energy in portfolio to electric sales | 10.00% |  |  |  |
Renewable Portfolio Standard | Required Percentage by 2015 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Required percentage of renewable energy in portfolio to electric sales | 15.00% |  |  |  |
Renewable Portfolio Standard | Required Percentage by 2020 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Required percentage of renewable energy in portfolio to electric sales | 20.00% |  |  |  |
Renewable Portfolio Standard Supplemental Procurement |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Solar photovoltaic capacity (in mw) |  |  |  |  | 1.5
Renewable Portfolio Standard 2014 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Wind energy capacity (in mw) | 204 | 102 |  |  |
NMPRC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Additional megawatt hours in first year (in mw) | GWh |  |  | 80 |  |
Requested solar production (in mw) |  |  | 50 |  |
New Mexico Wind | NMPRC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Additional megawatt hours in second year (in mw) | GWh |  |  | 105 |  |
Lightning Dock Geothermal | NMPRC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Additional megawatt hours in first year (in mw) | GWh |  |  | 55 |  |
Additional megawatt hours in second year (in mw) | GWh |  |  | 77 |  |

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