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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
MW
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations        
Operating revenues $ 444,118 $ 364,707    
Operating expenses 376,050 321,541    
Earnings attributable to non-controlling interest 3,095 3,494    
Financial Position        
Current assets 301,145   $ 324,600  
Assets 8,727,686 7,943,309 8,666,885  
Current liabilities 673,043   664,213  
Owners’ equity – non-controlling interest 54,268   55,405  
San Juan Generating Station | Coal supply        
Variable Interest Entity [Line Items]        
Cash used to support bank letter or credit arrangement       $ 30,300
PNM        
Results of Operations        
Operating revenues 338,709 271,213    
Operating expenses 293,693 238,163    
Earnings attributable to non-controlling interest 3,095 3,494    
Financial Position        
Current assets 243,465   266,689  
Assets 6,040,088   6,060,133  
Current liabilities 484,339   495,902  
Owners’ equity – non-controlling interest 54,268   55,405  
PNM | Valencia        
Variable Interest Entity [Line Items]        
Payment for fixed costs 4,800 4,900    
Payment for variable costs $ 100 200    
Long-term contract option to purchase, ownership percentage (up to) 50.00%      
Long-term contract option to purchase, purchase price - percentage of adjusted NBV 50.00%      
Long-term contract option to purchase, purchase price - percentage of FMV 50.00%      
Results of Operations        
Operating revenues $ 4,932 5,127    
Operating expenses 1,837 1,633    
Earnings attributable to non-controlling interest 3,095 $ 3,494    
Financial Position        
Current assets 3,206   3,042  
Net property, plant, and equipment 52,198   52,908  
Assets 55,404   55,950  
Current liabilities 1,136   545  
Owners’ equity – non-controlling interest $ 54,268   $ 55,405  
PNM | Purchased through May 2028 | Valencia        
Variable Interest Entity [Line Items]        
Number of megawatts purchased (in megawatts) | MW 155