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Income Taxes - Schedule of Deferred Income Tax Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table $ 70,338    
Change in tax effects of income tax related regulatory assets and liabilities (12,424)    
Amortization of excess deferred income tax (24,484)    
Tax effect of mark-to-market adjustments 2,729    
Tax effect of excess pension liability (5,196)    
Adjustment for uncertain income tax positions 562    
Reclassification of unrecognized tax benefits (562)    
Other (216)    
Deferred income taxes 30,747 $ 20,405 $ (25,385)
Public Service Company of New Mexico      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 51,532    
Change in tax effects of income tax related regulatory assets and liabilities (9,834)    
Amortization of excess deferred income tax (15,158)    
Tax effect of mark-to-market adjustments 2,957    
Tax effect of excess pension liability (5,196)    
Adjustment for uncertain income tax positions 541    
Reclassification of unrecognized tax benefits 2,278    
Deferred income taxes 27,120 22,442 (20,145)
Texas-New Mexico Power Company      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 11,879    
Change in tax effects of income tax related regulatory assets and liabilities (2,591)    
Amortization of excess deferred income tax (9,326)    
Other (215)    
Deferred income taxes $ (253) $ (7,773) $ (7,650)