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Regulatory and Rate Matters - Energy Efficiency and Load Management (Details) - Public Service Company of New Mexico [Member] - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 06, 2014 | Nov. 30, 2013 | Dec. 31, 2014 | Sep. 30, 2015 | Jan. 30, 2015 | Dec. 31, 2013
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% |  | 3.00%

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