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Commitments and Contingencies - Coal Supply (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 17, 2022
$ / T
Nov. 09, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 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       $ 1,082 $ 1,635      
PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Other current assets       995 1,456      
PNM | Loss on long-term purchase commitment | Surface                
Public Utilities, Commitments And Contingencies [Line Items]                
Loss contingency accrual       66,600 67,400      
PNM | Loss on long-term purchase commitment | Underground                
Public Utilities, Commitments And Contingencies [Line Items]                
Loss contingency accrual       28,300 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       72,900        
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       10,000 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       7,000        
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 | Coal-Fired Electricity Generating Facility Demolition And Remediation Ordinance | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Public Utilities, Initial Funding Requirement   $ 14,700            
Loss Contingency, Surety Bond   $ 46,000            
San Juan Generating Station and Four Corners | Mine Reclamation Trust | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Customer Reclamation Funding Cost, Maximum       $ 100,000