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Regulatory and Rate Matters - COVID-19 Electricity Relief Program (Details) - Texas-New Mexico Power Company
$ in Thousands
Apr. 14, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 30, 2020
MWh
Dec. 31, 2019
USD ($)
Public Utilities, General Disclosures [Line Items]        
Rider charge from electricity relief program | MWh     0.33  
Regulatory liabilities   $ 187,407   $ 182,979
Proceeds from short-term debt $ 500      
COVID-19        
Public Utilities, General Disclosures [Line Items]        
Regulatory liabilities   100    
Other deferred costs, gross, CARES Act   $ 700