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Electric Operating Revenues - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) MW | Dec. 31, 2020 USD ($) | Jan. 01, 2019 | Jan. 01, 2018 MW
Contract with Customers, Asset and Liability [Roll Forward] |  |  |  |
Allowance for credit loss | $ (1,100,000) | $ 6,800,000 |  |
Other receivables, allowance for credit loss | 1,000,000 | 0 |  |
Capitalized contract cost, amortization period |  |  | 5 years |
Contract assets | 600,000 | 0 |  |
Texas-New Mexico Power Company |  |  |  |
Contract with Customers, Asset and Liability [Roll Forward] |  |  |  |
Regulatory assets from defaulting REP's | $ 800,000 |  |  |
Public Service Company of New Mexico |  |  |  |
Contract with Customers, Asset and Liability [Roll Forward] |  |  |  |
Expected exposure to market risk (in megawatts) | MW | 65 |  |  | 65
Power to be sold to third party (in megawatts) | MW | 36 |  |  | 36
Contract with customers, net | $ 86,800,000 | $ 86,200,000 |  |

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