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Variable Interest Entities (Details)
 3 Months Ended 9 Months Ended
Feb. 01, 2016
USD ($)
Sep. 30, 2019
USD ($)
MW
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
MW
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations              
Earnings attributable to non-controlling interest   $ 3,860,000 $ 3,920,000 $ 10,188,000 $ 11,706,000    
Financial Position              
Current assets   341,164,000   341,164,000   $ 302,524,000  
Total assets   7,200,932,000 6,848,995,000 7,200,932,000 6,848,995,000 6,865,551,000  
Current liabilities   945,729,000   945,729,000   512,453,000  
Owners’ equity – non-controlling interest   64,175,000   64,175,000   64,212,000  
PNM              
Results of Operations              
Earnings attributable to non-controlling interest   3,860,000 3,920,000 10,188,000 11,706,000    
Financial Position              
Current assets   284,787,000   284,787,000   270,319,000  
Total assets   5,176,831,000   5,176,831,000   5,035,883,000  
Current liabilities   611,334,000   611,334,000   223,023,000  
Owners’ equity – non-controlling interest   64,175,000   64,175,000   64,212,000  
PNM | Valencia              
Variable Interest Entity [Line Items]              
Payment for fixed costs   5,000,000.0 4,900,000 14,900,000 14,700,000    
Payment for variable costs   400,000 500,000 $ 700,000 1,400,000    
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   5,409,000 5,368,000 $ 15,538,000 16,047,000    
Operating expenses   1,549,000 1,448,000 5,350,000 4,341,000    
Earnings attributable to non-controlling interest   3,860,000 $ 3,920,000 10,188,000 $ 11,706,000    
Financial Position              
Current assets   5,789,000   5,789,000   2,684,000  
Net property, plant, and equipment   59,292,000   59,292,000   62,066,000  
Total assets   65,081,000   65,081,000   64,750,000  
Current liabilities   906,000   906,000   538,000  
Owners’ equity – non-controlling interest   $ 64,175,000   $ 64,175,000   $ 64,212,000  
PNM | Valencia | Purchased through May 2028              
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]              
Loan agreement among several entities $ 125,000,000.0            
Cash used to support bank letter or credit arrangement   $ 30,300,000   $ 30,300,000     $ 30,300,000