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Variable Interest Entities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
MW
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations        
Earnings attributable to non-controlling interest $ 14,013 $ 14,241 $ 15,112  
Financial Position        
Current assets 377,479 294,010    
Total assets 7,939,854 7,298,774 6,865,551  
Current liabilities 977,662 967,481    
Owners’ equity – non-controlling interest 59,009 63,052    
Public Service Company of New Mexico        
Results of Operations        
Earnings attributable to non-controlling interest 14,013 14,241 15,112  
Financial Position        
Current assets 322,128 259,195    
Total assets 5,581,033 5,242,991    
Current liabilities 594,332 593,236    
Owners’ equity – non-controlling interest $ 59,009 63,052    
Public Service Company of New Mexico | Valencia        
Variable Interest Entity [Line Items]        
Number of megawatts purchased (in megawatts) | MW 155      
Payment for fixed charges $ 20,000 19,900 19,600  
Payment for variable charges $ 1,400 1,200 1,400  
Purchase price, percentage of the book value reduced by related indebtedness 50.00%      
Purchase price, percentage of fair market value 50.00%      
Results of Operations        
Operating revenues $ 21,297 21,073 21,025  
Operating expenses 7,284 6,832 5,913  
Earnings attributable to non-controlling interest 14,013 14,241 $ 15,112  
Financial Position        
Current assets 3,911 5,094    
Net property, plant and equipment 55,744 58,581    
Total assets 59,655 63,675    
Current liabilities 646 623    
Owners’ equity – non-controlling interest $ 59,009 $ 63,052    
Public Service Company of New Mexico | Maximum | Valencia        
Variable Interest Entity [Line Items]        
Option to purchase a percentage of the plant or VIE (up to ) 50.00%      
NM Capital | Coal Supply | San Juan Generating Station        
Financial Position        
Issuance in letters of credit $ 30,300     $ 30,300