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Commitments and Contingencies - Coal Supply (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 17, 2022
$ / T
Dec. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2016
USD ($)
Public Utilities, Commitments And Contingencies [Line Items]              
Other current assets       $ 6,453 $ 1,635    
PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Other current assets       6,500 1,456    
PNM | Loss on long-term purchase commitment | Surface              
Public Utilities, Commitments And Contingencies [Line Items]              
Loss contingency accrual       64,300 67,400    
PNM | Loss on long-term purchase commitment | Underground              
Public Utilities, Commitments And Contingencies [Line Items]              
Loss contingency accrual       29,300 27,900    
PNM | Loss on long-term purchase commitment | San Juan Generating Station | Surface              
Public Utilities, Commitments And Contingencies [Line Items]              
Estimate of possible loss       69,700      
PNM | Loss on long-term purchase commitment | San Juan Generating Station | Underground              
Public Utilities, Commitments And Contingencies [Line Items]              
Estimate of possible loss       34,900      
Coal supply | San Juan Generating Station              
Public Utilities, Commitments And Contingencies [Line Items]              
Cash used to support bank letter or credit arrangement             $ 30,300
Coal supply | Four Corners              
Public Utilities, Commitments And Contingencies [Line Items]              
Payments for relief from obligations       75,000      
Coal supply | PNM | San Juan Generating Station              
Public Utilities, Commitments And Contingencies [Line Items]              
Other current assets       0 20,400    
Increase in price of coal per ton | $ / T 5.00            
Coal supply | NM Capital | San Juan Generating Station              
Public Utilities, Commitments And Contingencies [Line Items]              
Requirement to post reclamation bonds       118,700      
Cash used to support bank letter or credit arrangement       30,300      
Increase in coal mine decommissioning liability | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Regulatory disallowance, additional amount recorded           $ 800  
Increase in coal mine decommissioning liability | PNM | Surface              
Public Utilities, Commitments And Contingencies [Line Items]              
Regulatory disallowance, additional amount recorded   $ 3,600          
Decrease in coal mine decommissioning liability | PNM | Underground              
Public Utilities, Commitments And Contingencies [Line Items]              
Regulatory disallowance, additional amount recorded   $ 100          
Decrease in coal mine decommissioning liability | PNM | Four Corners              
Public Utilities, Commitments And Contingencies [Line Items]              
Regulatory disallowance, additional amount recorded     $ 2,500        
Mine Reclamation Trust | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Required contribution to reclamation trust, current fiscal year       9,900      
Reclamation trust funding, year 2       0      
Reclamation trust funding, year 3       0      
Four Corners CSA | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Other commitment, due in first year       2,400 2,200    
Other commitment, due in second year       2,100      
Other commitment, due in third year       2,100      
Other commitment, due in fourth year       2,100      
San Juan Generating Station | Loss on long-term purchase commitment | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Annual funding post-term reclamation trust         $ 5,200    
San Juan Generating Station and Four Corners | Mine Reclamation Trust | PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Customer reclamation funding cost       $ 100,000