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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
MW
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations        
Operating revenues $ 364,707 $ 333,622    
Operating expenses 321,541 285,884    
Earnings attributable to non-controlling interest 3,494 3,729    
Financial Position        
Current assets 328,478   $ 377,479  
Assets 7,943,309 7,375,119 7,939,854  
Current liabilities 1,511,120   977,662  
Owners’ equity – non-controlling interest 57,260   59,009  
PNM        
Results of Operations        
Operating revenues 271,213 248,133    
Operating expenses 238,163 214,528    
Earnings attributable to non-controlling interest 3,494 3,729    
Financial Position        
Current assets 292,085   322,128  
Assets 5,561,146   5,581,033  
Current liabilities 562,919   594,332  
Owners’ equity – non-controlling interest 57,260   59,009  
PNM | Valencia        
Variable Interest Entity [Line Items]        
Payment for fixed costs 4,900 5,000    
Payment for variable costs $ 200 400    
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 $ 5,127 5,353    
Operating expenses 1,633 1,624    
Earnings attributable to non-controlling interest 3,494 $ 3,729    
Financial Position        
Current assets 3,282   3,911  
Net property, plant, and equipment 55,035   55,744  
Assets 58,317   59,655  
Current liabilities 1,057   646  
Owners’ equity – non-controlling interest $ 57,260   $ 59,009  
PNM | Purchased through May 2028 | Valencia        
Variable Interest Entity [Line Items]        
Number of megawatts purchased (in megawatts) | MW 155      
NM Capital | San Juan Generating Station | Coal supply        
Variable Interest Entity [Line Items]        
Cash used to support bank letter or credit arrangement $ 30,300     $ 30,300