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Commitments and Contingencies - Coal Supply (Details)
$ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 17, 2022
$ / T
Dec. 31, 2020
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2016
USD ($)
Public Utilities, Commitments And Contingencies [Line Items]              
Other current assets     $ 1,304 $ 1,635      
PNM              
Public Utilities, Commitments And Contingencies [Line Items]              
Other current assets     1,055 1,456      
PNM | Loss on long-term purchase commitment | Surface              
Public Utilities, Commitments And Contingencies [Line Items]              
Loss contingency accrual     65,200 67,400      
PNM | Loss on long-term purchase commitment | Underground              
Public Utilities, Commitments And Contingencies [Line Items]              
Loss contingency accrual     28,800 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     71,100        
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     3,300 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     8,700        
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       2,200      
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