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Regulatory and Rate Matters - Hazard Sharing Agreement (Details) - Public Service Company of New Mexico [Member] - Tri-State [Member] $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2016 | Jun. 01, 2016 MW | Dec. 31, 2016 USD ($) MWh
Public Utilities, General Disclosures [Line Items] |  |  |
Hazard sharing agreement |  | 1 year |
Agreement to sell the other party capacity and energy (in mw) | MW |  | 100 |
Number of megawatt hours sold (in mwh) | MWh |  |  | 482,342
Megawatt hours sold | $ |  |  | $ 12.8
Number of megawatt hours purchased (in mwh) | MWh |  |  | 484,632
Megawatt hours purchased | $ |  |  | $ 12.9
NMPRC [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Hazard sharing agreement | 5 years |  | 5 years

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