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Commitments and Contingencies - Stipulation Filed with the NMPRC (Details)
 9 Months Ended
Apr. 08, 2015
USD ($)
MW
Oct. 01, 2014
USD ($)
$ / kw
MW
Dec. 20, 2013
USD ($)
$ / kw
MW
Sep. 30, 2015
USD ($)
$ / kw
MW
Aug. 13, 2015
USD ($)
MWh
MW
Jul. 31, 2015
MW
May. 19, 2015
MW
Jan. 15, 2015
MW
Jul. 31, 2014
MW
Jun. 26, 2014
MW
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public Utilities, Estimated costs to remain unrecovered       $ 20,000,000            
San Juan Generating Station Unit 4 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public utilities, additional ownership to be obtained (in megawatts) | MW   132 78 132 65   132   132 132
Public Utilities, Estimated rate base value at 1/1/2018   $ 26,000,000     $ 0          
Public utilities, ownership PNM has agreed not to obtain (in megawatts) | MW               65    
coal-fired generation in Megawatts | MW         197          
Public Utilities, Number of Megawatt-hours of Renewable Energy Certificates to be acquired and retired beginning Jan 2020 | MWh         1          
San Juan Generating Station Unit 4 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR Hearing Examiner Recommended Denial [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public utilities, additional ownership to be obtained (in megawatts) | MW 132       132 132        
San Juan Generating Station Unit 4 [Member] | Maximum [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public Utilities, Annual cost of Renewable Energy Credits         $ 7,000,000          
San Juan Generating Station Unit 3 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public utilities, proposed reduction in carrying value   26,000,000                
Public utilities, estimated unrecoverable increase in operations and maintenance   20,000,000                
San Juan Generating Station Unit 3 [Member] | Maximum [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public utilities, estimated pre-tax regulatory disallowance $ 155,000,000 70,000,000   $ 155,000,000            
San Juan Generating Station Unit 3 [Member] | Minimum [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public utilities, estimated pre-tax regulatory disallowance 145,000,000 $ 60,000,000   145,000,000            
San Juan Generating Station Units 2 and 3 [Member] | Public Service Company of New Mexico [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Net book value       $ 279,000,000            
San Juan Generating Station Units 2 and 3 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public Utilities, Current ownership interest, in Megawatts | MW       418            
Public utilities, recovery percentage of estimated undepreciated value at 12/31/17   50.00%   50.00%            
Public Utilities, Recoverable portion, Estimated undepreciated value at 12/31/17       $ 128,500,000            
Public utilities, estimated undepreciated value at 12/31/17 $ 128,500,000 $ 231,000,000   $ 257,000,000            
Public utilities, requested time period to recover retired units NBV   20 years 20 years 20 years            
Public utilities, write-off percentage of estimated undepreciated value at 12/31/17 50.00% 50.00%                
Palo Verde Nuclear Generating Station Unit 3 [Member] | Public Service Company of New Mexico [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Net book value       $ 147,000,000            
Palo Verde Nuclear Generating Station Unit 3 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public Utilities, Estimated rate base value at 1/1/2018   $ 221,100,000                
Public utilities, estimated undepreciated value at 12/31/17       $ 150,000,000            
Public utilities, proposed value per kilowatt effective January 1, 2018 (in dollars per kilowatt) | $ / kw   1,650   1,118            
Palo Verde Nuclear Generating Station Unit 3 [Member] | PNMR and PNM [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public utilities, number of megawatts nuclear generation (in megawatts) | MW       134            
Palo Verde Nuclear Generating Station Unit 3 [Member] | PNMR and PNM [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Public utilities, number of megawatts nuclear generation (in megawatts) | MW   134 134   134          
Public utilities, proposed value per kilowatt effective January 1, 2018 (in dollars per kilowatt) | $ / kw     2,500              
Public utilities, percentage capacity factor 7-year performance threshold   75.00%                
Public utilities, period over which to measure capacity performance   7 years                
San Juan Generating Station Units 1 and 4 [Member] | Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member] | Maximum [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]                    
Public Utilities, Commitments And Contingencies [Line Items]                    
Estimated installation capital costs   $ 90,600,000 $ 82,000,000