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Commitments and Contingencies (Commitments and Contingencies Related to the Environment) (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 4 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended
Dec. 21, 2011
mw
Dec. 21, 2011
San Juan Generating Station [Member]
Oct. 31, 2012
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
San Juan Generating Station Units 1 and 4 [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
San Juan Generating Station Units 2 and 3 [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
San Juan Generating Station Units 2 and 3 [Member]
PNM Electric [Member]
Mar. 31, 2014
Palo Verde Nuclear Generating Station Unit 3 [Member]
PNMR and PNM [Member]
MW
Mar. 31, 2014
Clean Air Act related to Regional Haze [Member]
state
Dec. 20, 2013
Clean Air Act, SNCR [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
MW
Dec. 20, 2013
Clean Air Act, SNCR [Member]
San Juan Generating Station Units 2 and 3 [Member]
Public Service Company of New Mexico [Member]
MW
Apr. 30, 2014
Clean Air Act, SNCR [Member]
San Juan Generating Station Units 2 and 3 [Member]
Public Service Company of New Mexico [Member]
Dec. 20, 2013
Clean Air Act, SNCR [Member]
Palo Verde Nuclear Generating Station Unit 3 [Member]
PNMR and PNM [Member]
MW
Mar. 31, 2014
Clean Air Act, SNCR [Member]
San Juan Generating Station Unit 3 [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Clean Air Act, SNCR [Member]
San Juan Generating Station Unit 4 [Member]
Public Service Company of New Mexico [Member]
MW
Dec. 20, 2013
Clean Air Act, SNCR [Member]
San Juan Generating Station Unit 4 [Member]
Public Service Company of New Mexico [Member]
MW
Mar. 31, 2014
Clean Air Act Related to Post Combustion Controls [Member]
Four Corners [Member]
Public Service Company of New Mexico [Member]
Aug. 06, 2012
Clean Air Act Related to Post Combustion Controls [Member]
Four Corners [Member]
Public Service Company of New Mexico [Member]
compliance_alternative
Mar. 31, 2014
Clean Air Act Related to Post Combustion Controls [Member]
Four Corners Units 4 and 5 (Coal) [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Mercury Control [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Jan. 31, 2010
Minimum [Member]
San Juan Generating Station And Four Corners [Member]
Public Service Company of New Mexico [Member]
opp
Jan. 31, 2010
Maximum [Member]
San Juan Generating Station And Four Corners [Member]
Public Service Company of New Mexico [Member]
opp
Mar. 31, 2014
Maximum [Member]
Mercury Control [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Oct. 31, 2012
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Minimum [Member]
Clean Air Act, SNCR [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Oct. 31, 2012
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Minimum [Member]
Clean Air Act, SCR [Member] [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Oct. 31, 2012
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Maximum [Member]
Clean Air Act, SNCR [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 11, 2014
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Maximum [Member]
Clean Air Act, SNCR [Member]
San Juan Generating Station Units 1 and 4 [Member]
Public Service Company of New Mexico [Member]
Dec. 20, 2013
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Maximum [Member]
Clean Air Act, SNCR [Member]
San Juan Generating Station Units 1 and 4 [Member]
Public Service Company of New Mexico [Member]
Oct. 31, 2012
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Maximum [Member]
Clean Air Act, SCR [Member] [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Environmental Protection Agency [Member]
WildEarth Guardians filed an action to challenge EPA's rule in the Tenth Circuit [Member]
San Juan Generating Station [Member]
Mar. 31, 2014
Environmental Protection Agency [Member]
Clean Air Act Related to Post Combustion Controls [Member]
Four Corners [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Nuclear Spent Fuel And Waste Disposal [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Nuclear Spent Fuel And Waste Disposal [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Nuclear Spent Fuel And Waste Disposal [Member]
Other Deferred Credits [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Nuclear Spent Fuel And Waste Disposal [Member]
Other Deferred Credits [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Public Utilities, Commitments and Contingencies [Line Items]                                                                    
Public Utilities, Requested Time Period to Recover Retired Units NBV                   20 years                                                
Loss Contingency, Estimate of Possible Loss                               $ 80.3                               $ 58.0    
Public Utilities, Number of Compliance alternatives                                 2                                  
Public Utilities, Ownership Percentage                         50.00% 39.00%       13.00%                                
Public Utilities, Plant Requirement to Meet NOx emissions Limit                               0.015                                    
Public Utilities, Number of States To Address Regional Haze               50                                                    
Public Utilities, Potential to emit tons per year of visibility impairing pollution, maximum               250                                                    
Estimated Total Capital Cost If Requirement Occurred                                               824       910            
Estimated Installation Capital Costs                                             85.0   90.0   82.0              
Estimated Portion of Total Capital Costs if Requirement Occurred                                             105   110                  
Jointly Owned Utility Plant, Proportionate Ownership Share     46.30% 52.00%                                                            
estimated cost of replacing gas fired peaking capacity due to retirement of SJGS units           276.3                                                        
Percentage of ownership held by exiting owners                         50.00% 39.00%                                        
Net book value         286                                                          
Public Utilities, Time Period from completed application to EPA Proposed Action                     135 days                                              
Public Utilities, Government Standard Emission Limit                                       0.060 0.070                          
Public Utilities, Plant Requirement to Meet Opacity Limit, Percentage                               20.00%                                    
Public Utilities, Rule Imposes Opacity Limitation on Certain Fugitive Dust Emissions From Coal and Material Handling Operations                               20.00%                                    
Current Annual Mercury Control Costs                                     0.7                              
Contingent Estimated Annual Mercury Control Cost                                           6.6                        
Minimum Megawatt Capacity from Coal and Oil-Fired Electric Generating Units under Jurisdiction of the Mercury and Air Toxics Standards 25                                                                  
Mercury Removal Rate, Percentage   99.00%                                                                
Public Utilities, Proposed Seeking Shorter Compliance Period                                                         5 years          
Public Utilities, Number of years after issuance of final determination to achieve compliance with requirements                                                           3 years        
Loss Contingency Accrual, at Carrying Value                                                                 12.0 11.9
Annual Fee, Nuclear Waste Disposal                                                             3.0      
Public Utilities, Expected NBV of Units at Retirement                   205                                                
Public Utilities, Number of Megawatts Nuclear Generation             134         134                                            
Public Utilities, Proposed value per Kilowatt effective January 1, 2018                       2,500                                            
Public Utilities, Additional Ownership To Be Obtained, in Megawatts                           78 78                                      
Requested Expenditure, Installation Capital Costs                                                   $ 1.9                
Public Utilities, Overall Reduction Of Ownership, in Megawatts                 340                                                  
Public Utilities, Newly Identified Replacement Gas-fired Generation, in Megawatts, December2013                   177                                                
Public Utilities, Newly Identified Replacement Solar Generation, in Megawatts, December2013                   40