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Summary of the Business and Significant Accounting Policies - Inventories/Depreciation and Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Public Utilities, Inventory [Line Items]      
Inventory $ 65,061 $ 66,417  
Coal      
Public Utilities, Inventory [Line Items]      
Inventory 2,973 12,012  
Materials and supplies      
Public Utilities, Inventory [Line Items]      
Inventory 62,088 54,405  
Public Service Company of New Mexico      
Public Utilities, Inventory [Line Items]      
Inventory 57,942 60,472  
Public Service Company of New Mexico | Coal      
Public Utilities, Inventory [Line Items]      
Inventory 2,973 12,012  
Public Service Company of New Mexico | Materials and supplies      
Public Utilities, Inventory [Line Items]      
Inventory $ 54,969 $ 48,460  
Public Service Company of New Mexico | Electric plant      
Public Utilities, Inventory [Line Items]      
Depreciation average rates used 2.48% 2.47% 2.47%
Public Service Company of New Mexico | Common, intangible, and general plant      
Public Utilities, Inventory [Line Items]      
Depreciation average rates used 7.91% 7.65% 7.91%
Texas-New Mexico Power Company      
Public Utilities, Inventory [Line Items]      
Depreciation average rates used 3.88% 3.95% 4.04%
Inventory $ 7,119 $ 5,945  
Texas-New Mexico Power Company | Coal      
Public Utilities, Inventory [Line Items]      
Inventory 0 0  
Texas-New Mexico Power Company | Materials and supplies      
Public Utilities, Inventory [Line Items]      
Inventory $ 7,119 $ 5,945