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Regulatory and Rate Matters - Energy Efficiency and Load Management (Details) - Public Service Company of New Mexico [Member] $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2016 USD ($) | Apr. 15, 2016 USD ($) GWh program | Oct. 06, 2014 USD ($) | Jan. 31, 2015 USD ($) | Nov. 30, 2013 | Oct. 31, 2012 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2016 | Jan. 30, 2015 USD ($)
Energy Efficiency and Load Management [Member] | Disincentives/Incentives Added [Member] |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Program costs related to energy efficiency |  |  |  |  |  | $ 22.5 |  |  |  |
Authorization to recover an incentive equal to a percentage of annual program costs |  |  |  |  | 7.60% |  |  |  |  |
Annual incentive |  |  |  |  |  |  |  | $ 1.7 |  |
2014 Energy Efficiency and Load Management Program [Member] | Disincentives/Incentives Added [Member] |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Program costs related to energy efficiency |  |  | $ 25.8 |  |  |  |  |  |  |
Proposed energy efficiency incentive |  |  |  |  |  |  | $ 2.1 |  |  |
Anticipated future profit incentive 2015 |  |  |  |  |  |  |  |  |  | $ 1.7
Anticipated future profit incentive 2016 |  |  |  |  |  |  |  |  |  | $ 1.8
2017 Energy Efficiency and Load Management Program [Member] | Disincentives/Incentives Added [Member] |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Program costs related to energy efficiency | $ 26.0 | $ 28.0 |  |  |  |  |  |  |  |
Number of energy efficiency and load management programs (in programs) | program |  | 10 |  |  |  |  |  |  |  |
Application of incentive based on target savings |  | $ 2.4 |  |  |  |  |  |  |  |
Energy efficiency targeted savings (in gwh) | GWh |  | 75 |  |  |  |  |  |  |  |
Minimum profit incentive | $ 1.8 |  |  | $ 1.8 |  |  |  |  |  |
Maximum [Member] | Renewable Portfolio Standard [Member] |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Reasonable cost threshold | 3.00% |  |  |  |  |  |  | 3.00% |  |
Sliding scale profit incentive | 9.00% |  |  |  |  |  |  |  |  |
Minimum [Member] | Renewable Portfolio Standard [Member] |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Reasonable cost threshold |  |  |  |  |  |  |  |  | 3.00% |
Sliding scale profit incentive | 7.10% |  |  |  |  |  |  |  |  |

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