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Summary of the Business and Significant Accounting Policies - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
utility
Facility
MW
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
utility
Facility
MW
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Sep. 29, 2017
Sep. 22, 2017
Sep. 05, 2017
MW
Jul. 08, 2016
MW
Dec. 31, 2015
USD ($)
Dec. 31, 1986
lease
Accounting Policies Disclosures [Line Items]                                    
Number of regulated utilities | utility 2               2                  
Payment defaults $ 0               $ 0                  
Allowance for equity funds used during construction                 $ 10,404,000 $ 9,516,000 $ 4,949,000              
Weighted average borrowing rate 5.60%       5.90%       5.60% 5.90% 6.10%              
Interest costs incurred, capitalized                 $ 600,000 $ 1,300,000 $ 1,800,000              
Plant in Service $ 7,548,581,000       $ 7,238,285,000       7,548,581,000 7,238,285,000                
Revenues (less than $0.1 million)                 1,436,613,000 1,445,003,000 1,362,951,000              
Operating expenses (less than $0.1 million)                 1,200,566,000 1,129,964,000 1,078,226,000              
Net income (less than $0.1 million) (55,077,000) $ 87,521,000 $ 38,208,000 $ 14,990,000 (54,282,000) $ 73,739,000 $ 37,555,000 $ 22,862,000                    
Construction work in progress 194,427,000       245,933,000       194,427,000 245,933,000                
Owner's equity 1,688,382,000       1,695,253,000       1,688,382,000 1,695,253,000                
Other current assets $ 53,725,000       47,358,000       $ 53,725,000 47,358,000                
PNMR                                    
Accounting Policies Disclosures [Line Items]                                    
Number of regulated utilities | utility 2               2                  
Public Service Company of New Mexico                                    
Accounting Policies Disclosures [Line Items]                                    
Restricted cash deposits             1,000,000       7,200,000           $ 8,200,000  
Allowance for funds used during construction, capitalized interest                 $ 6,100,000 6,300,000 5,300,000              
Allowance for equity funds used during construction                 8,173,000 8,664,000 4,163,000              
Interest costs incurred, capitalized                 200,000 600,000 800,000              
Impairment losses on securities held in the NDT                 13,700,000 7,100,000 13,900,000              
Plant in Service $ 5,623,520,000       5,501,070,000       5,623,520,000 5,501,070,000                
Revenues (less than $0.1 million)                 1,091,965,000 1,104,230,000 1,035,913,000              
Operating expenses (less than $0.1 million)                 946,932,000 883,151,000 841,083,000              
Net income (less than $0.1 million) (56,806,000) 77,508,000 26,672,000 7,837,000 (32,021,000) 60,827,000 26,932,000 16,658,000 55,211,000 72,396,000 77,419,000              
Construction work in progress 134,221,000       204,079,000       134,221,000 204,079,000                
Owner's equity 1,397,359,000       1,422,174,000       1,397,359,000 1,422,174,000                
Other current assets $ 42,433,000       39,904,000       $ 42,433,000 39,904,000                
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                 $ 2,300,000 1,200,000 900,000              
Allowance for equity funds used during construction                 2,200,000 900,000 800,000              
Interest costs incurred, capitalized                 100,000 100,000 100,000              
Plant in Service $ 1,686,119,000       1,504,778,000       1,686,119,000 1,504,778,000                
Revenues (less than $0.1 million)                 344,648,000 340,773,000 327,038,000              
Operating expenses (less than $0.1 million)                 248,151,000 247,169,000 235,397,000              
Net income (less than $0.1 million) 10,711,000 $ 16,100,000 $ 15,367,000 $ 9,413,000 1,024,000 $ 14,727,000 $ 12,204,000 $ 7,604,000 51,591,000 35,559,000 41,672,000              
Construction work in progress 51,459,000       34,350,000       51,459,000 34,350,000                
Owner's equity 674,093,000       634,405,000       674,093,000 634,405,000 593,235,000           533,380,000  
Other current assets 1,114,000       1,131,000       1,114,000 1,131,000                
PNMR Development                                    
Accounting Policies Disclosures [Line Items]                                    
Solar distributed generation (in mw) | MW                             50 30    
NMRD                                    
Accounting Policies Disclosures [Line Items]                                    
Revenues (less than $0.1 million)                 3,100,000 100,000                
Operating expenses (less than $0.1 million)                   100,000                
Net income (less than $0.1 million)                 1,000,000 100,000                
Cash 2,600,000       6,000,000       2,600,000 6,000,000                
Construction work in progress 50,800,000       30,900,000       50,800,000 30,900,000                
Accounts payable 200,000       3,900,000       200,000 3,900,000                
Owner's equity $ 53,200,000       33,000,000       $ 53,200,000 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 33.9               33.9                  
Megawatts supplying energy to data center (in mw) | MW 30               30                  
Megawatts supplying energy to Columbus Electric Cooperative (in mw) | MW 3.9               3.9                  
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                 $ 9,600,000 4,100,000                
Accounting Standards Update 2016-18 | Public Service Company of New Mexico                                    
Accounting Policies Disclosures [Line Items]                                    
Cash, cash equivalents, restricted cash and restricted cash equivalents                     1,000,000           $ 8,200,000  
Other current assets         1,000,000         1,000,000 $ 7,200,000              
Accounting Standards Update 2016-18 | NMCUC                                    
Accounting Policies Disclosures [Line Items]                                    
Cash, cash equivalents, restricted cash and restricted cash equivalents         $ 100,000         $ 100,000                
Accounting Standards Update 2016-02 | Scenario, forecast | PNMR | Subsequent Event                                    
Accounting Policies Disclosures [Line Items]                                    
Operating lease, right-of-use asset                       $ 160,000,000            
Operating lease, liability                       160,000,000            
Accounting Standards Update 2016-02 | Scenario, forecast | Public Service Company of New Mexico | Subsequent Event                                    
Accounting Policies Disclosures [Line Items]                                    
Operating lease, right-of-use asset                       146,000,000            
Operating lease, liability                       146,000,000            
Accounting Standards Update 2016-02 | Scenario, forecast | Texas-New Mexico Power Company | Subsequent Event                                    
Accounting Policies Disclosures [Line Items]                                    
Operating lease, right-of-use asset                       12,000,000            
Operating lease, liability                       $ 12,000,000