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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
MW
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
MW
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations            
Operating revenues $ 477,156 $ 499,730 $ 1,021,233 $ 943,848    
Operating expenses 384,826 413,338 829,812 789,388    
Earnings attributable to non-controlling interest 3,987 3,630 9,114 6,725    
Financial Position            
Current assets 404,637   404,637   $ 410,978  
Assets 9,626,970 8,911,105 9,626,970 8,911,105 9,257,377  
Current liabilities 1,108,239   1,108,239   890,370  
Owners’ equity – non-controlling interest $ 51,353   $ 51,353   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   64.1      
Results of Operations            
Operating revenues $ 338,242 376,754 $ 768,407 715,463    
Operating expenses 283,827 327,319 636,088 621,012    
Earnings attributable to non-controlling interest 3,987 3,630 9,114 6,725    
Financial Position            
Current assets 344,544   344,544   345,645  
Assets 6,440,357   6,440,357   6,272,166  
Current liabilities 840,543   840,543   692,155  
Owners’ equity – non-controlling interest 51,353   51,353   52,994  
PNM | Valencia            
Variable Interest Entity [Line Items]            
Payment for fixed costs 5,100 4,800 10,000 9,600    
Payment for variable costs 1,100 300 $ 2,700 400    
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 6,144 5,098 $ 12,748 10,030    
Operating expenses 2,157 1,468 3,634 3,305    
Earnings attributable to non-controlling interest 3,987 $ 3,630 9,114 $ 6,725    
Financial Position            
Current assets 3,577   3,577   3,429  
Net property, plant, and equipment 48,673   48,673   50,094  
Assets 52,250   52,250   53,523  
Current liabilities 897   897   529  
Owners’ equity – non-controlling interest $ 51,353   $ 51,353   $ 52,994  
PNM | Purchased through May 2028 | Valencia            
Variable Interest Entity [Line Items]            
Number of megawatts purchased (in megawatts) | MW 155   155