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Variable Interest Entities (Details)
 3 Months Ended 6 Months Ended
Feb. 01, 2016
USD ($)
Jun. 30, 2018
USD ($)
MW
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
MW
Jun. 30, 2017
USD ($)
May 22, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations                
Earnings attributable to non-controlling interest   $ 4,109,000 $ 3,544,000 $ 7,786,000 $ 6,996,000      
Financial Position                
Current assets   331,242,000   331,242,000     $ 294,420,000  
Total assets   6,750,089,000 6,584,445,000 6,750,089,000 6,584,445,000   6,646,103,000  
Current liabilities   962,150,000   962,150,000     835,644,000  
Owners’ equity – non-controlling interest   65,600,000   65,600,000     66,195,000  
PNM                
Results of Operations                
Earnings attributable to non-controlling interest   4,109,000 3,544,000 7,786,000 6,996,000      
Financial Position                
Current assets   281,110,000   281,110,000     243,631,000  
Total assets   4,994,277,000   4,994,277,000     4,921,563,000  
Current liabilities   392,261,000   392,261,000     218,496,000  
Owners’ equity – non-controlling interest   65,600,000   65,600,000     66,195,000  
PNM | Valencia                
Variable Interest Entity [Line Items]                
Payment for fixed costs   4,900,000 4,900,000 9,800,000 9,800,000      
Payment for variable costs   600,000 200,000 $ 900,000 300,000      
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   5,911,000 5,094,000 $ 10,679,000 10,021,000      
Operating expenses   (1,802,000) (1,550,000) (2,893,000) (3,025,000)      
Earnings attributable to non-controlling interest   4,109,000 $ 3,544,000 7,786,000 $ 6,996,000      
Financial Position                
Current assets   3,304,000   3,304,000     2,688,000  
Net property, plant, and equipment   62,975,000   62,975,000     64,109,000  
Total assets   66,279,000   66,279,000     66,797,000  
Current liabilities   679,000   679,000     602,000  
Owners’ equity – non-controlling interest   $ 65,600,000   $ 65,600,000     $ 66,195,000  
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
NM Capital | San Juan Coal Company, Westmoreland | Coal supply                
Variable Interest Entity [Line Items]                
Repayment of line of credit           $ 50,100,000