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Regulatory and Rate Matters - Hazard Sharing Agreement (Details) - Public Service Company of New Mexico - Tri-State GWh in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 01, 2016 MW | Dec. 31, 2019 USD ($) GWh | Dec. 31, 2018 USD ($) GWh | Dec. 31, 2017 USD ($) GWh
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 hours sold (in GWh) | GWh |  | 766.4 | 725.7 | 827.1
Hours sold (in dollars) | $ |  | $ 21.7 | $ 25.8 | $ 23.6
Number of hours purchased (in GWh) | GWh |  | 693.6 | 822.7 | 849.0
Hours purchased (in dollars) | $ |  | $ 21.8 | $ 28.7 | $ 24.2

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