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Commitments and Contingencies (Details) (USD $)
 12 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 21, 2011
mw
Dec. 31, 2010
Positive Outcome of 1992 Litigation [Member]
Oct. 21, 2009
Positive Outcome of 1992 Litigation [Member]
Jun. 18, 2010
Palo Verde Nuclear Generating Station [Member]
Dec. 21, 2011
San Juan Generating Station [Member]
Nov. 08, 2010
Four Corners [Member]
Jun. 18, 2010
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Oct. 31, 2012
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Jun. 18, 2010
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Spent Fuel And Waste Disposal [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Other Deferred Credits [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Spent Fuel And Waste Disposal [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Other Deferred Credits [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Spent Fuel And Waste Disposal [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Coal Supply [Member]
San Juan Generating Station [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Coal Supply [Member]
San Juan Generating Station [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Surface [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Surface [Member]
San Juan Generating Station [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Underground [Member]
San Juan Generating Station [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Nuclear Plant [Member]
Palo Verde Nuclear Generating Station [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Nuclear Plant [Member]
Maximum [Member]
Palo Verde Nuclear Generating Station [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Commercial Providers [Member]
Nuclear Plant [Member]
Palo Verde Nuclear Generating Station [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Industry Wide Retrospective Assessment Program [Member]
Nuclear Plant [Member]
Palo Verde Nuclear Generating Station [Member]
Jun. 18, 2010
Cost of Energy [Member]
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Jun. 18, 2010
Reduction of Utility Plant [Member]
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Dec. 31, 2012
Fuel and purchased power adjustment clause [Member]
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Dec. 31, 2012
TGP Granada, LLC and its affiliate Complaint [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
TGP Granada, LLC and its affiliate Complaint [Member]
Tortoise Capital Resources Corporation [Member]
Jul. 31, 2012
Transmissions Issues [Member]
Public Service Company of New Mexico [Member]
Aug. 31, 2010
Transmissions Issues [Member]
Public Service Company of New Mexico [Member]
Apr. 12, 2012
Sierra Club Allegations [Member]
San Juan Generating Station [Member]
Apr. 12, 2012
Sierra Club Allegations [Member]
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Dec. 31, 2012
Clean Air Act related to Regional Haze [Member]
state
Dec. 31, 2012
Clean Air Act related to Post-Combustion Controls [Member]
Public Service Company of New Mexico [Member]
Four Corners [Member]
compliance_alternative
Dec. 31, 2012
Loss on Long-term Purchase Commitment [Member]
Public Service Company of New Mexico [Member]
Aug. 31, 2012
Loss on Long-term Purchase Commitment [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Loss on Long-term Purchase Commitment [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Clean Air Act, SNCR [Member]
Public Service Company of New Mexico [Member]
Minimum [Member]
San Juan Generating Station [Member]
Dec. 31, 2012
Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member]
Clean Air Act, SNCR [Member]
Public Service Company of New Mexico [Member]
Maximum [Member]
San Juan Generating Station [Member]
Dec. 31, 2012
Environmental Protection Agency [Member]
Clean Air Act related to Post-Combustion Controls [Member]
Public Service Company of New Mexico [Member]
Four Corners [Member]
Dec. 31, 2012
Environmental Protection Agency [Member]
WildEarth Guardians filed an action to challenge EPA's rule in the Tenth Circuit [Member]
San Juan Generating Station [Member]
Loss Contingencies [Line Items]                                                                                                      
Public Utilities, Number of Compliance alternatives                                                                                       2              
Payments to Acquire Investments to be Held in Decommissioning Trust Fund                           $ 2,600,000 $ 2,600,000 $ 3,000,000                                                                      
Decommissioning Fund Investments, Fair Value                           189,000,000 168,900,000                                                                        
Loss Contingency, Estimate of Possible Loss                                 42,800,000                 61,400,000     19,700,000                             75,400,000              
Mine Reclamation and Closing Liability, Noncurrent                                     13,900,000 14,500,000       26,800,000 26,500,000   4,200,000 4,200,000                                              
Final Reclamation, capped amount to be collected                                               100,000,000                                                      
Regulatory Assets                   468,446,000   396,867,000                     100,000,000                                                        
Preliminary estimate increased deferral related to mine fire incident                                                                       21,600,000                              
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                                                                                        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners               48.00%                                                                                      
Jointly Owned Utility Plant, Proportionate Ownership Share                           10.20% [1]       46.30%                                                                  
Public Utilities, Government Standard Emission Limit (pounds per MMBTU, parts per million)                                                                                       0.015              
Other, net 31,490,000 33,397,000               27,457,000   26,776,000                 9,900,000 14,600,000                                                          
Public Utilities, Liability Insurance Coverage                                                             12,600,000,000 375,000,000 12,200,000,000                                    
Public Utilities, Ownership Percentage in Nuclear Reactor                                                           10.20%                                          
Public Utilities, Maximum Potential Assessment Per Incident                                                           36,000,000                                          
Public Utilities, Annual Payment Limitation Related to Incident                                                           5,400,000                                          
Public Utilities, Aggregate Amount of All Risk Insurance                                                           2,750,000,000                                          
Public Utilities, Maximum Amount under Nuclear Electic Insurance Limited                                                           4,300,000                                          
Litigation Settlement, Gross           30,200,000     1,300,000       3,100,000                                         2,100,000 1,000,000       200,000 200,000                      
Litigation Settlement Amount, Revised by Appellate Court         9,700,000                                                                                            
Litigation settlement recorded in other income       1,200,000                                                                                              
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%              
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                                                                                               824,000,000 910,000,000    
Estimated Installation Capital Costs                                                                                               85,000,000 90,000,000    
Estimated Portion of Total Capital Costs if Requirement Occured                                                                                               105,000,000 110,000,000    
Estimated Total Litigation Settlement Cost                                                                                 10,200,000                    
Estimated Company Share Litigation Settlement Cost                                                                                   4,500,000                  
Public Utilities, Estimated Initial Funding Requirements                                                                                           2,600,000          
Public Utilities, Estimated Initial Funding Requirements, Additional to be Funded                                                                                         1,000,000            
Public Utilities, Expected Funding Annual Requirements                                                                                             800,000        
Public Utilities, Lease ownership percentage in EIP                                                                         60.00% 40.00%                          
Public Utilites, Option to renew portion of current EIP lease payments for maximum term to be calculated at end of initial lease term                                                                         50.00%                            
Public Utilities, Option to Purchase Leased Capacity At Fair Value                     $ 7,700,000                                                                                
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  
[1] (1) Includes interest in PVNGS Unit 3, interest in common facilities for all PVNGS units, and owned interests in PVNGS Units 1 and 2.