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Variable Interest Entities (Details)
 3 Months Ended
Feb. 01, 2016
USD ($)
Mar. 31, 2019
USD ($)
MW
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
May 22, 2018
USD ($)
Jan. 31, 2016
USD ($)
Results of Operations            
Earnings attributable to non-controlling interest   $ 2,830,000 $ 3,677,000      
Financial Position            
Current assets   457,073,000   $ 302,524,000    
Total assets   7,250,758,000 6,676,393,000 6,865,551,000    
Current liabilities   664,133,000   512,453,000    
Owners’ equity – non-controlling interest   62,779,000   64,212,000    
PNM            
Results of Operations            
Earnings attributable to non-controlling interest   2,830,000 3,677,000      
Financial Position            
Current assets   255,419,000   270,319,000    
Total assets   5,202,039,000   5,035,883,000    
Current liabilities   195,667,000   223,023,000    
Owners’ equity – non-controlling interest   62,779,000   64,212,000    
PNM | Valencia            
Variable Interest Entity [Line Items]            
Payment for fixed costs   4,900,000 4,900,000      
Payment for variable costs   $ 100,000 300,000      
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   $ 4,952,000 4,768,000      
Operating expenses   (2,122,000) (1,091,000)      
Earnings attributable to non-controlling interest   2,830,000 $ 3,677,000      
Financial Position            
Current assets   2,918,000   2,684,000    
Net property, plant, and equipment   60,712,000   62,066,000    
Total assets   63,630,000   64,750,000    
Current liabilities   851,000   538,000    
Owners’ equity – non-controlling interest   $ 62,779,000   $ 64,212,000    
PNM | Valencia | Purchased through May 2028            
Variable Interest Entity [Line Items]            
Number of megawatts purchased (in megawatts) | MW   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
NM Capital | San Juan Coal Company, Westmoreland | Coal supply            
Variable Interest Entity [Line Items]            
Repayment of line of credit         $ 50,100,000