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Financing - Long-term Debt (Details) - USD ($)
Dec. 31, 2016
Dec. 21, 2016
Dec. 31, 2015
Dec. 17, 2015
Aug. 11, 2015
Debt Instrument [Line Items]          
Total $ 2,388,577,000   $ 2,086,370,000    
Principal, Less current maturities 274,025,000   125,000,000    
Long-term debt, excluding current maturities, gross 2,114,552,000   1,961,370,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net (4,135,000)   (5,578,000)    
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities 677,000   21,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities (4,812,000)   (5,599,000)    
PNMR 2016 Two Year Term Loan [Member]          
Debt Instrument [Line Items]          
Long-term debt   $ 100,000,000.0      
Public Service Company of New Mexico [Member]          
Debt Instrument [Line Items]          
Total 1,640,870,000   1,590,870,000    
Principal, Less current maturities 232,000,000   125,000,000    
Long-term debt, excluding current maturities, gross 1,408,870,000   1,465,870,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net 9,501,000   10,193,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities 120,000   21,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities $ 9,381,000   10,172,000    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 4.875% due 2033 [Member]          
Debt Instrument [Line Items]          
Stated percentage 4.875%        
Unsecured long-term debt, noncurrent $ 0   146,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 0   721,000    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 1.875% due 2033, mandatory tender at October 1, 2021 [Member]          
Debt Instrument [Line Items]          
Stated percentage 1.875%        
Unsecured long-term debt, noncurrent $ 146,000,000   0    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 1,807,000   0    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 6.25% due 2038 [Member]          
Debt Instrument [Line Items]          
Stated percentage 6.25%        
Unsecured long-term debt, noncurrent $ 36,000,000   36,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 239,000   251,000    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 4.75% due 2040, mandatory tender at June 1, 2017 [Member]          
Debt Instrument [Line Items]          
Stated percentage 4.75%        
Unsecured long-term debt, noncurrent $ 37,000,000   37,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 25,000   82,000    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 5.20% due 2040, mandatory tender at June 1, 2020 [Member]          
Debt Instrument [Line Items]          
Stated percentage 5.20%        
Unsecured long-term debt, noncurrent $ 40,045,000   40,045,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 147,000   190,000    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 5.90% due 2040 [Member]          
Debt Instrument [Line Items]          
Stated percentage 5.90%        
Unsecured long-term debt, noncurrent $ 255,000,000   255,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 2,131,000   2,222,000    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 6.25% due 2040 [Member]          
Debt Instrument [Line Items]          
Stated percentage 6.25%        
Unsecured long-term debt, noncurrent $ 11,500,000   11,500,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 96,000   100,000    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 2.54% due 2042, mandatory tender at June 1, 2017 [Member]          
Debt Instrument [Line Items]          
Stated percentage 2.54%        
Unsecured long-term debt, noncurrent $ 20,000,000   20,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 67,000   199,000    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 2.40% due 2043, mandatory tender at June 1, 2020 [Member]          
Debt Instrument [Line Items]          
Stated percentage 2.40%        
Unsecured long-term debt, noncurrent $ 39,300,000   39,300,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 340,000   456,000    
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 5.20% due 2043, mandatory tender at June 1, 2020 [Member]          
Debt Instrument [Line Items]          
Stated percentage 5.20%        
Unsecured long-term debt, noncurrent $ 21,000,000   21,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 75,000   96,000    
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | 7.95% due 2018 [Member]          
Debt Instrument [Line Items]          
Stated percentage 7.95%        
Unsecured long-term debt, noncurrent $ 350,000,000   350,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 995,000   1,718,000    
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | 7.50% due 2018 [Member]          
Debt Instrument [Line Items]          
Stated percentage 7.50%        
Unsecured long-term debt, noncurrent $ 100,025,000   100,025,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 197,000   320,000    
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | 5.35% due 2021 [Member]          
Debt Instrument [Line Items]          
Stated percentage 5.35%        
Unsecured long-term debt, noncurrent $ 160,000,000   160,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 780,000   943,000    
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | 3.85% due 2025 [Member]          
Debt Instrument [Line Items]          
Stated percentage 3.85%       3.85%
Unsecured long-term debt, noncurrent $ 250,000,000   250,000,000   $ 250,000,000.0
Unamortized Discounts, (Premiums), and Issuance Costs, net 2,574,000   2,874,000    
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | PNM Multi-Draw Term Loan Agreement due 2016 [Member]          
Debt Instrument [Line Items]          
Long-term debt 0   125,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net 0   21,000    
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | PNM 2016 Term Loan Agreement [Member]          
Debt Instrument [Line Items]          
Long-term debt 175,000,000   0    
Unamortized Discounts, (Premiums), and Issuance Costs, net 28,000   0    
Texas-New Mexico Power Company [Member]          
Debt Instrument [Line Items]          
Total 405,500,000   345,500,000    
Principal, Less current maturities 0   0    
Long-term debt, excluding current maturities, gross 405,500,000   345,500,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net (15,375,000)   (15,911,000)    
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities 0   0    
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities $ (15,375,000)   (15,911,000)    
Texas-New Mexico Power Company [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds, 9.50% due 2019, Series 2009A [Member]          
Debt Instrument [Line Items]          
Stated percentage 9.50%        
Unsecured long-term debt, noncurrent $ 172,302,000   172,302,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 1,857,000   2,682,000    
Texas-New Mexico Power Company [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds, 6.95% due 2043, Series 2013A [Member]          
Debt Instrument [Line Items]          
Stated percentage 6.95%        
Unsecured long-term debt, noncurrent $ 93,198,000   93,198,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ (18,773,000)   (19,490,000)    
Texas-New Mexico Power Company [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds, 4.03% due 2024, Series 2014A [Member]          
Debt Instrument [Line Items]          
Stated percentage 4.03%        
Unsecured long-term debt, noncurrent $ 80,000,000   80,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 792,000   897,000    
Texas-New Mexico Power Company [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds, 3.53% due 2026, Series 2016A [Member]          
Debt Instrument [Line Items]          
Stated percentage 3.53%     3.53%  
Unsecured long-term debt, noncurrent $ 60,000,000   0    
Unamortized Discounts, (Premiums), and Issuance Costs, net 749,000   0    
PNMR [Member]          
Debt Instrument [Line Items]          
Total 342,207,000   150,000,000    
Principal, Less current maturities 42,025,000   0    
Long-term debt, excluding current maturities, gross 300,182,000   150,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net 1,739,000   140,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities 557,000   0    
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities 1,182,000   140,000    
PNMR [Member] | PNMR Term Loan Agreement due 2018 [Member]          
Debt Instrument [Line Items]          
Long-term debt 150,000,000   150,000,000    
Unamortized Discounts, (Premiums), and Issuance Costs, net 84,000   140,000    
PNMR [Member] | BTMU Term Loan Agreement [Member]          
Debt Instrument [Line Items]          
Long-term debt 92,207,000   0    
Unamortized Discounts, (Premiums), and Issuance Costs, net 1,634,000   0    
PNMR [Member] | PNMR 2016 Two Year Term Loan [Member]          
Debt Instrument [Line Items]          
Long-term debt 100,000,000   0    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 21,000   $ 0