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Regulatory and Rate Matters - Renewable Portfolio Standard and Energy Rider (Details) - Public Service Company of New Mexico [Member] |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2013 USD ($) MWh MW | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) MW | Dec. 31, 2014 USD ($) $ / MWh | Dec. 31, 2013 $ / MWh | Apr. 27, 2015 USD ($) | Feb. 27, 2015 USD ($)
Renewable Portfolio Standard [Member] | Required Percentage by 2011 [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, 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] |  |  |  |  |  |  |  |
Public utilities, 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] |  |  |  |  |  |  |  |
Public utilities, required percentage of renewable energy in portfolio to electric sales |  |  |  | 20.00% |  |  |  |
Renewable Portfolio Standard [Member] | Minimum [Member] | Wind Energy [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, required percentage of diversification |  |  |  | 30.00% |  |  |  |
Renewable Portfolio Standard [Member] | Minimum [Member] | Solar Energy [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, required percentage of diversification |  |  |  | 20.00% |  |  |  |
Renewable Portfolio Standard [Member] | Minimum [Member] | Distributed Generation [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, required percentage of diversification |  |  |  | 3.00% |  |  |  |
Renewable Portfolio Standard [Member] | Minimum [Member] | Renewable Technologies [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, required percentage of diversification |  |  |  | 5.00% |  |  |  |
Renewable Portfolio Standard [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, reasonable cost threshold |  |  |  | 3.00% |  | 3.00% |  |
2014 Wind generated Renewable Energy Credits [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, number of megawatt hours of wind generation (megawatt hours) | MWh | 50,000 |  |  |  |  |  |  |
Renewable Portfolio Standard 2014 [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, number of megawatts of solar photovoltaic capacity (in megawatts) | MW | 23 |  |  |  |  |  |  |
Public utilities, estimated cost of megawatts of solar photovoltaic capacity | $ 46,700,000 |  |  |  |  |  |  |
Public utilities, wind capacity planned purchase agreement term | 20 years |  |  |  |  |  |  |
Public utilities, number of megawatts of wind energy capacity (in megawatts) | MW | 102 |  |  |  |  |  |  |
Public utilities, first-year cost of wind capacity, planned purchase agreement | $ 5,800,000.0 |  |  |  |  |  |  |
Public utilities, final cost of solar photovoltaic capacity |  |  |  |  | $ 46,500,000 |  |  |
Public Utilities, Cost of renewable resources procured |  | $ 100,000 | $ 100,000 |  |  |  |  |
2015 Wind generated Renewable Energy Credits [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, number of megawatt hours of wind generation (megawatt hours) | MWh | 120,000 |  |  |  |  |  |  |
Renewable Portfolio Standard 2015 [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, number of megawatts of solar photovoltaic capacity (in megawatts) | MW |  |  |  | 40 |  |  |  |
Public utilities, estimated cost of megawatts of solar photovoltaic capacity |  |  |  | $ 78,000,000 |  |  |  |
Public Utilities, Approved Revised cost per MWh for additional necessary procurements to comply with RPS | $ / MWh |  |  |  |  | 3.00 | 3.00 |  |
Renewable Energy Rider [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public utilities, revenue from renewable energy rider |  |  |  |  | $ 34,300,000 |  |  |
Renewable Energy Rider [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  | 10.50% |  |  |  |
Public utilities, rider condition of earned return on jurisdictional equity in 2013 |  |  |  |  |  | 10.50% |  |
Public utilities, annual revenue to be collected under 2015 rider rate |  |  |  | $ 44,700,000 |  |  |  |
Public utilities, revised annual revenue to be collected under 2015 rider rate |  |  |  |  |  |  |  | $ 43,000,000
Public utilities, annual revenue to be collected under 2016 rider rate |  |  |  |  |  |  | $ 42,400,000 |

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