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Commitments and Contingencies - Coal Supply (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Feb. 17, 2022
$ / T
Dec. 31, 2020
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2016
USD ($)
Other Commitments [Line Items]            
Other current assets     $ 31,624 $ 1,635    
Four Corners | Coal Supply            
Other Commitments [Line Items]            
Payments for relief from obligations     75,000      
Public Service Company of New Mexico            
Other Commitments [Line Items]            
Other current assets     20,706 1,456    
Public Service Company of New Mexico | Loss on long-term purchase commitment | San Juan Generating Station            
Other Commitments [Line Items]            
Annual funding post-term reclamation trust     10,000 5,200 $ 3,200  
Public Service Company of New Mexico | Mine Reclamation Trust | Four Corners            
Other Commitments [Line Items]            
Funds contributed to mine reclamation trust     2,400 2,200 2,000  
Funds contributed next fiscal year through year five     2,100      
Public Service Company of New Mexico | Mine Reclamation Trust | San Juan Generating Station And Four Corners            
Other Commitments [Line Items]            
Customer reclamation funding cost, maximum     100,000      
Public Service Company of New Mexico | Surface | Loss on long-term purchase commitment            
Other Commitments [Line Items]            
Liability for interim storage costs     62,600 67,400    
Public Service Company of New Mexico | Surface | Increase in coal mine decommissioning liability            
Other Commitments [Line Items]            
Net expense   $ 3,600        
Public Service Company of New Mexico | Underground | Loss on long-term purchase commitment            
Other Commitments [Line Items]            
Liability for interim storage costs     28,200 27,900    
Public Service Company of New Mexico | Underground | Increase in coal mine decommissioning liability            
Other Commitments [Line Items]            
Net expense   $ 100        
Public Service Company of New Mexico | San Juan Generating Station | Surface | Loss on long-term purchase commitment            
Other Commitments [Line Items]            
Estimate of possible loss     67,700      
Public Service Company of New Mexico | San Juan Generating Station | Underground | Loss on long-term purchase commitment            
Other Commitments [Line Items]            
Estimate of possible loss     33,300      
Public Service Company of New Mexico | San Juan Generating Station | Coal Supply            
Other Commitments [Line Items]            
Other current assets       $ 20,400    
Increase in price of coal (per ton) | $ / T 5.00          
Public Service Company of New Mexico | Four Corners | Increase in coal mine decommissioning liability            
Other Commitments [Line Items]            
Net expense         $ 2,500  
NM Capital | San Juan Generating Station | Coal Supply            
Other Commitments [Line Items]            
Coal mine reclamation bonds to be posted with NMMMD     118,700      
Issuance in letters of credit     $ 30,300     $ 30,300