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Variable Interest Entities (Details)
 3 Months Ended 9 Months Ended
Jan. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
MW
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
MW
Sep. 30, 2016
USD ($)
Oct. 20, 2017
USD ($)
Dec. 31, 2016
USD ($)
Results of Operations              
Earnings attributable to non-controlling interest   $ 4,456,000 $ 4,006,000 $ 11,452,000 $ 11,037,000    
Financial Position              
Current assets   374,535,000   374,535,000     $ 378,039,000
Total assets   6,697,254,000 6,403,670,000 6,697,254,000 6,403,670,000   6,471,080,000
Current liabilities   710,885,000   710,885,000     805,108,000
Owners’ equity – non-controlling interest   67,409,000   67,409,000     68,920,000
PNM              
Results of Operations              
Earnings attributable to non-controlling interest   4,456,000 4,006,000 11,452,000 11,037,000    
Financial Position              
Current assets   331,618,000   331,618,000     314,245,000
Total assets   5,023,816,000   5,023,816,000     4,867,546,000
Current liabilities   191,066,000   191,066,000     457,361,000
Owners’ equity – non-controlling interest   67,409,000   67,409,000     68,920,000
PNM | Valencia              
Variable Interest Entity [Line Items]              
Payment for fixed costs   4,900,000 4,900,000 14,700,000 14,500,000    
Payment for variable costs   900,000 500,000 $ 1,200,000 1,100,000    
Long-term contract option to purchase, ownership percentage       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   5,859,000 5,356,000 $ 15,880,000 15,541,000    
Operating expenses   (1,403,000) (1,350,000) (4,428,000) (4,504,000)    
Earnings attributable to non-controlling interest   4,456,000 $ 4,006,000 11,452,000 $ 11,037,000    
Financial Position              
Current assets   3,498,000   3,498,000     2,551,000
Net property, plant, and equipment   64,818,000   64,818,000     66,947,000
Total assets   68,316,000   68,316,000     69,498,000
Current liabilities   907,000   907,000     578,000
Owners’ equity – non-controlling interest   $ 67,409,000   $ 67,409,000     $ 68,920,000
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]              
Loan receivable $ 125,000,000 66,200,000   66,200,000      
Interest receivable   1,200,000   1,200,000      
Scheduled principal payment proceeds   9,600,000   9,600,000      
Scheduled interest payment proceeds   $ 1,800,000   $ 1,800,000      
Unaffiliated third party | San Juan Coal Company, Westmoreland | Coal supply | Subsequent event              
Variable Interest Entity [Line Items]              
Amount held in a restricted bank account           $ 11,400,000