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Construction Program and Jointly-Owned Electric Generating Plants (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2023
MW
Dec. 31, 2022
USD ($)
generatingUnit
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jointly Owned Utility Plant Interests [Line Items]        
Construction expenditures   $ 912,557 $ 935,016 $ 679,028
Plant in Service   9,164,564 9,357,849  
Accumulated Depreciation   2,659,952 2,952,743  
Public Service Company of New Mexico        
Jointly Owned Utility Plant Interests [Line Items]        
Construction expenditures   433,459 602,180 335,055
Plant in Service   6,007,464 6,602,015  
Accumulated Depreciation   1,908,644 2,235,068  
Texas-New Mexico Power Company        
Jointly Owned Utility Plant Interests [Line Items]        
Construction expenditures   449,534 311,909 $ 321,505
Plant in Service   2,853,130 2,475,859  
Accumulated Depreciation   578,157 $ 563,004  
Joint Projects | Public Service Company of New Mexico        
Jointly Owned Utility Plant Interests [Line Items]        
Construction expenditures   433,500    
Joint Projects | Texas-New Mexico Power Company        
Jointly Owned Utility Plant Interests [Line Items]        
Construction expenditures   449,500    
Joint Projects | PNMR        
Jointly Owned Utility Plant Interests [Line Items]        
Construction expenditures   912,600    
Palo Verde Nuclear Generating Station | Public Service Company of New Mexico        
Jointly Owned Utility Plant Interests [Line Items]        
Plant in Service   891,708    
Accumulated Depreciation   420,076    
Construction Work in Progress   $ 35,504    
Composite Interest   10.20%    
Number of units (in generating units) | generatingUnit   3    
Operating lease, option term extensions   20 years    
Palo Verde Nuclear Generating Station | Public Service Company of New Mexico | Subsequent Event        
Jointly Owned Utility Plant Interests [Line Items]        
Composite Interest 7.60%      
Leased capacity | MW 104      
Four Corners Units 4 and 5 (Coal) | Public Service Company of New Mexico        
Jointly Owned Utility Plant Interests [Line Items]        
Plant in Service   $ 320,376    
Accumulated Depreciation   101,022    
Construction Work in Progress   $ 9,390    
Composite Interest   13.00%    
Luna (Gas) | Public Service Company of New Mexico        
Jointly Owned Utility Plant Interests [Line Items]        
Plant in Service   $ 83,146    
Accumulated Depreciation   33,063    
Construction Work in Progress   $ 111    
Composite Interest   33.33%    
Four Corners | Public Service Company of New Mexico        
Jointly Owned Utility Plant Interests [Line Items]        
Number of units (in generating units) | generatingUnit   2