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Summary of the Business and Significant Accounting Policies - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Facility
MW
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Facility
MW
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2018
MW
Sep. 29, 2017
Sep. 22, 2017
Jul. 08, 2016
MW
Dec. 31, 2014
USD ($)
Dec. 31, 1986
lease
Accounting Policies Disclosures [Line Items]                                    
Payment defaults   $ 0               $ 0                
Allowance for equity funds used during construction                   $ 9,516,000 $ 4,949,000 $ 10,430,000            
Weighted average borrowing rate   5.90%       6.10%       5.90% 6.10% 6.60%            
Interest costs incurred, capitalized                   $ 1,300,000 $ 1,800,000 $ 1,500,000            
Plant in Service   $ 7,238,285,000       $ 6,944,534,000       7,238,285,000 6,944,534,000              
Operating Expenses (less than $0.1 million)                   1,138,518,000 1,084,966,000 1,314,732,000            
Net income (less than $0.1 million)   (54,282,000) $ 73,739,000 $ 37,555,000 $ 22,862,000 24,809,000 $ 54,418,000 $ 27,076,000 $ 10,546,000 79,874,000 116,849,000 15,640,000            
Construction work in progress   245,933,000       208,206,000       245,933,000 208,206,000              
Owner's equity   1,695,253,000       1,675,952,000       1,695,253,000 1,675,952,000              
Unrealized gains, net of income taxes, recorded in AOCI   11,100,000               11,100,000                
Public Service Company of New Mexico                                    
Accounting Policies Disclosures [Line Items]                                    
Allowance for funds used during construction, capitalized interest                   6,300,000 5,300,000 7,800,000            
Allowance for equity funds used during construction                   8,664,000 4,163,000 10,430,000            
Interest costs incurred, capitalized                   600,000 800,000 800,000            
Impairment losses on securities held in the NDT                   7,100,000 13,900,000 10,400,000            
Plant in Service   5,501,070,000       5,359,211,000       5,501,070,000 5,359,211,000              
Operating Expenses (less than $0.1 million)                   891,705,000 847,823,000 1,097,815,000            
Net income (less than $0.1 million)   (32,021,000) 60,827,000 26,932,000 16,658,000 16,112,000 40,984,000 16,049,000 4,274,000 72,396,000 77,419,000 (15,234,000)            
Construction work in progress   204,079,000       158,122,000       204,079,000 158,122,000              
Owner's equity   $ 1,422,174,000       1,397,872,000       1,422,174,000 1,397,872,000              
Restricted cash deposits                       8,200,000            
Administrative and general, pre-tax                   $ 4,700,000 3,000,000              
Public Service Company of New Mexico | Subsequent Event                                    
Accounting Policies Disclosures [Line Items]                                    
Refund to third party $ 7,100,000                                  
Public Service Company of New Mexico | 10.3% Lessor Notes                                    
Accounting Policies Disclosures [Line Items]                                    
Notes receivable, stated percentage rate   10.30%               10.30%                
Public Service Company of New Mexico | 10.15% Lessor Notes                                    
Accounting Policies Disclosures [Line Items]                                    
Notes receivable, stated percentage rate   10.15%               10.15%                
Public Service Company of New Mexico | Palo Verde Nuclear Generating Station                                    
Accounting Policies Disclosures [Line Items]                                    
Number of operating leases | lease                                   11
Texas-New Mexico Power Company                                    
Accounting Policies Disclosures [Line Items]                                    
Allowance for funds used during construction, capitalized interest                   $ 1,200,000 900,000 500,000            
Allowance for equity funds used during construction                   900,000 800,000 0            
Interest costs incurred, capitalized                   100,000 100,000 100,000            
Plant in Service   $ 1,504,778,000       1,380,584,000       1,504,778,000 1,380,584,000              
Operating Expenses (less than $0.1 million)                   247,169,000 235,397,000 217,854,000            
Net income (less than $0.1 million)   1,024,000 $ 14,727,000 $ 12,204,000 $ 7,604,000 9,855,000 $ 13,853,000 $ 10,508,000 $ 7,456,000 35,559,000 41,672,000 41,963,000            
Construction work in progress   34,350,000       16,978,000       34,350,000 16,978,000              
Owner's equity   634,405,000       $ 593,235,000       634,405,000 593,235,000 $ 533,380,000         $ 524,665,000  
Net periodic benefit cost (less than $0.1 million)                   100,000 $ 100,000              
PNMR Development                                    
Accounting Policies Disclosures [Line Items]                                    
Solar distributed generation (in mw) | MW                               30    
Solar capacity (in mw) | MW                               10    
NMRD                                    
Accounting Policies Disclosures [Line Items]                                    
Revenues (less than $0.1 million)                   100,000                
Operating Expenses (less than $0.1 million)                   100,000                
Net income (less than $0.1 million)                   100,000                
Cash   6,000,000               6,000,000                
Construction work in progress   30,900,000               30,900,000                
Accounts payable   3,900,000               3,900,000                
Owner's equity   $ 33,000,000               $ 33,000,000                
NMRD                                    
Accounting Policies Disclosures [Line Items]                                    
Solar distributed generation (in mw) | MW   30               30                
Plant in Service   $ 12,400,000               $ 12,400,000                
Renewable energy capacity under contract | MW   31.8               31.8                
Megawatts for solar PV facilities in operation (in mw) | MW   11.8               11.8                
Megawatts supplying energy to data center (in mw) | MW   10               10                
Megawatts supplying energy to Columbus Electric Cooperative (in mw) | MW   1.8               1.8                
Solar capacity (in mw) | MW   20               20                
NMRD | PNMR Development                                    
Accounting Policies Disclosures [Line Items]                                    
Ownership percentage                             50.00%      
Number of solar facilities | Facility   3               3                
Solar distributed generation (in mw) | MW   10               10                
Plant in Service   $ 24,800,000               $ 24,800,000                
Cash contribution percentage   50.00%               50.00%                
NMRD | AEP OnSite Partners                                    
Accounting Policies Disclosures [Line Items]                                    
Ownership percentage                           50.00%        
NMRD | PNMR Development and AEP OnSite                                    
Accounting Policies Disclosures [Line Items]                                    
Contribution to construction activities                   $ 4,100,000                
Scenario, forecast | NMRD                                    
Accounting Policies Disclosures [Line Items]                                    
Solar distributed generation (in mw) | MW                         20