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Commitments and Contingencies (Commitments and Contingencies Related to the Environment) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 6 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]
Jun. 30, 2013
San Juan Generating Station Units 1 and 4 [Member]
Public Service Company of New Mexico [Member]
Jun. 30, 2013
San Juan Generating Station Units 2 and 3 [Member]
PNM [Member]
Nov. 08, 2010
Four Corners [Member]
Jun. 30, 2013
Clean Air Act related to Regional Haze [Member]
state
Jun. 30, 2013
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
Sep. 30, 2012
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
Sep. 30, 2012
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]
Jun. 30, 2013
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 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, SNCR [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Jun. 30, 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]
Jun. 30, 2013
Environmental Protection Agency [Member]
WildEarth Guardians filed an action to challenge EPA's rule in the Tenth Circuit [Member]
San Juan Generating Station [Member]
Jun. 30, 2013
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, 2012
Nuclear Spent Fuel And Waste Disposal [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Jun. 30, 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]
Dec. 31, 2012
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]                                            
Loss Contingency, Estimate of Possible Loss               $ 75.0                       $ 42.8    
Public Utilities, Number of Compliance alternatives                 2                          
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 Occured                           824   910            
Estimated Installation Capital Costs                           85.0 60.0 90.0 80.0          
Estimated Portion of Total Capital Costs if Requirement Occured                           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         280                                  
Net book value         289                                  
Public Utilities, Government Standard Emission Limit                     0.060 0.070                    
Public Utilitites, Plant Requirment 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                   0.6                        
Contingent Estimated Annual Mercury Control Cost                         6.1                  
Minimum Megawatt Capacity from Coal and Oil-Fired Electric Generating Units under Jurisdiction of the Merucy and Air Toxics Standards 25                                          
Mercury Removal Rate, Percentage   0.99                                        
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                                         $ 12.3 $ 13.9
Public Utilties, Jointly Owned Utility Plant, Sale of Ownership Percentage           48.00%