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Regulatory and Rate Matters - FPPAC Continuation Application (Details) - FPPAC Continuation Application [Member] - Public Service Company of New Mexico [Member] - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2014 | Apr. 23, 2014 | Dec. 31, 2013
Public Utilities, General Disclosures [Line Items] |  |  |
Retention percentage of sales margins |  | 10.00% |
Under-collected balance write-off |  |  | $ 10.5
Under-collected balance to be recovered | $ 63.5 |  |
Period of time to collect |  | 18 months |

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