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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
MW
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations        
Operating revenues $ 544,077 $ 444,118    
Operating expenses 444,986 376,050    
Earnings attributable to non-controlling interest 5,127 3,095    
Financial Position        
Current assets 351,899   $ 410,978  
Assets 9,353,136 8,727,686 9,257,377  
Current liabilities 1,195,465   890,370  
Owners’ equity – non-controlling interest $ 52,611   52,994  
San Juan Generating Station | Coal supply        
Variable Interest Entity [Line Items]        
Cash used to support bank letter or credit arrangement       $ 30,300
PNM        
Variable Interest Entity [Line Items]        
Number of megawatts purchased (in megawatts) | MW 64.1      
Results of Operations        
Operating revenues $ 430,165 338,709    
Operating expenses 352,261 293,693    
Earnings attributable to non-controlling interest 5,127 3,095    
Financial Position        
Current assets 306,463   345,645  
Assets 6,306,396   6,272,166  
Current liabilities 892,730   692,155  
Owners’ equity – non-controlling interest 52,611   52,994  
PNM | Valencia        
Variable Interest Entity [Line Items]        
Payment for fixed costs 5,000 4,800    
Payment for variable costs $ 1,600 100    
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 $ 6,604 4,932    
Operating expenses 1,477 1,837    
Earnings attributable to non-controlling interest 5,127 $ 3,095    
Financial Position        
Current assets 4,029   3,429  
Net property, plant, and equipment 49,383   50,094  
Assets 53,412   53,523  
Current liabilities 801   529  
Owners’ equity – non-controlling interest $ 52,611   $ 52,994  
PNM | Purchased through May 2028 | Valencia        
Variable Interest Entity [Line Items]        
Number of megawatts purchased (in megawatts) | MW 155