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Income Taxes - Schedule of Deferred Income Tax Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table $ 57,981    
Change in tax effects of income tax related regulatory assets and liabilities (7,546)    
Amortization of excess deferred income tax (23,599)    
Tax effect of mark-to-market adjustments (1,359)    
Tax effect of excess pension liability (645)    
Adjustment for uncertain income tax positions 1,439    
Reclassification of unrecognized tax benefits (1,439)    
Other (299)    
Deferred income tax 24,533 $ 30,747 $ 20,405
Public Service Company of New Mexico      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 51,358    
Change in tax effects of income tax related regulatory assets and liabilities (4,995)    
Amortization of excess deferred income tax (14,421)    
Tax effect of mark-to-market adjustments 1,462    
Tax effect of excess pension liability (646)    
Adjustment for uncertain income tax positions 1,430    
Reclassification of unrecognized tax benefits (4,701)    
Deferred income tax 29,487 27,120 22,442
Texas-New Mexico Power Company      
Income Taxes [Line Items]      
Net change in deferred income tax liability per above table 7,389    
Change in tax effects of income tax related regulatory assets and liabilities (2,552)    
Amortization of excess deferred income tax (9,177)    
Other (216)    
Deferred income tax $ (4,556) $ (253) $ (7,773)