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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
MW
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
MW
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations            
Operating revenues $ 472,465 $ 433,586 $ 1,163,736 $ 1,113,458    
Operating expenses 324,660 293,046 897,043 1,029,810    
Earnings attributable to non-controlling interest 3,553 3,860 11,222 10,188    
Financial Position            
Current assets 377,985   377,985   $ 294,010  
Assets 7,742,112 7,200,932 7,742,112 7,200,932 7,298,774  
Current liabilities 1,251,579   1,251,579   967,481  
Owners’ equity – non-controlling interest 59,279   59,279   63,052  
PNM            
Results of Operations            
Operating revenues 364,504 331,113 873,425 838,649    
Operating expenses 247,964 222,660 673,697 821,881    
Earnings attributable to non-controlling interest 3,553 3,860 11,222 10,188    
Financial Position            
Current assets 302,730   302,730   259,195  
Assets 5,449,238   5,449,238   5,242,991  
Current liabilities 401,344   401,344   593,236  
Owners’ equity – non-controlling interest 59,279   59,279   63,052  
PNM | Valencia            
Variable Interest Entity [Line Items]            
Payment for fixed costs 5,000 5,000 15,000 14,900    
Payment for variable costs 300 400 $ 1,200 700    
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 5,278 5,409 $ 16,126 15,538    
Operating expenses 1,725 1,549 4,904 5,350    
Earnings attributable to non-controlling interest 3,553 $ 3,860 11,222 $ 10,188    
Financial Position            
Current assets 3,701   3,701   5,094  
Net property, plant, and equipment 56,453   56,453   58,581  
Assets 60,154   60,154   63,675  
Current liabilities 875   875   623  
Owners’ equity – non-controlling interest $ 59,279   $ 59,279   $ 63,052  
PNM | Purchased through May 2028 | Valencia            
Variable Interest Entity [Line Items]            
Number of megawatts purchased (in megawatts) | MW 158   158      
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     $ 30,300