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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
MW
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
MW
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations            
Operating revenues $ 499,730 $ 426,540 $ 943,848 $ 791,247    
Operating expenses 413,338 352,337 789,388 673,878    
Earnings attributable to non-controlling interest 3,630 3,920 6,725 7,414    
Financial Position            
Current assets 370,289   370,289   $ 324,600  
Assets 8,911,105 8,120,469 8,911,105 8,120,469 8,666,885  
Current liabilities 894,484   894,484   664,213  
Owners’ equity – non-controlling interest 54,165   54,165   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 376,754 323,949 715,463 595,162    
Operating expenses 327,319 272,182 621,012 510,345    
Earnings attributable to non-controlling interest 3,630 3,920 6,725 7,414    
Financial Position            
Current assets 294,509   294,509   266,689  
Assets 6,090,151   6,090,151   6,060,133  
Current liabilities 663,625   663,625   495,902  
Owners’ equity – non-controlling interest 54,165   54,165   55,405  
PNM | Valencia            
Variable Interest Entity [Line Items]            
Payment for fixed costs 4,800 5,000 9,600 10,000    
Payment for variable costs 300 600 $ 400 800    
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 5,098 5,579 $ 10,030 10,706    
Operating expenses 1,468 1,659 3,305 3,292    
Earnings attributable to non-controlling interest 3,630 $ 3,920 6,725 $ 7,414    
Financial Position            
Current assets 3,512   3,512   3,042  
Net property, plant, and equipment 51,489   51,489   52,908  
Assets 55,001   55,001   55,950  
Current liabilities 836   836   545  
Owners’ equity – non-controlling interest $ 54,165   $ 54,165   $ 55,405  
PNM | Purchased through May 2028 | Valencia            
Variable Interest Entity [Line Items]            
Number of megawatts purchased (in megawatts) | MW 155   155