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Regulatory and Rate Matters - Energy Efficiency and Load Management (Details) - Public Service Company of New Mexico [Member] - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Oct. 06, 2014 | Jun. 30, 2015 | Dec. 31, 2014
Energy Efficiency and Load Management [Member] | Disincentives / Incentives Adder [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Program Costs Related To Energy Efficiency | $ 25.8 |  |
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program, Percentage of Program Costs |  | 7.60% |
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program |  | $ 1.7 |
Public Utilities, Proposed Profit Incentive Adder Revenues Related To 2015 Energy Efficiency Program | $ 2.1 |  |
2014 Energy Efficiency and Load Management Program [Member] | Disincentives / Incentives Adder [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Anticipated future profit incentive 2015 |  |  | $ 1.7
Public Utilities, Anticipated future profit incentive 2016 |  |  | $ 1.8
Maximum [Member] | Renewable Portfolio Standard [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Reasonable Cost Threshold |  | 3.00% |

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