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Commitments and Contingencies (Other Commitments and Contingencies) (Details) (USD $)
 9 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
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]
Sep. 30, 2013
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Coal Supply [Member]
Dec. 31, 2012
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Coal Supply [Member]
Sep. 30, 2013
Surface [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
TGP Granada, LLC and its affiliate Complaint [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
TGP Granada, LLC and its affiliate Complaint [Member]
Tortoise Capital Resources Corporation [Member]
Sep. 30, 2013
Nuclear Plant [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Nuclear Plant [Member]
Maximum [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Nuclear Plant [Member]
Commercial Providers [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Nuclear Plant [Member]
Industry Wide Retrospective Assessment Program [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Loss on Long-term Purchase Commitment [Member]
Surface [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Loss on Long-term Purchase Commitment [Member]
Surface [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Loss on Long-term Purchase Commitment [Member]
Surface [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Loss on Long-term Purchase Commitment [Member]
Underground [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Loss on Long-term Purchase Commitment [Member]
Underground [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Loss on Long-term Purchase Commitment [Member]
Underground [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
San Juan Underground Mine Fire [Member]
Fuel and Purchased Power Adjustment Clause [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
Continuous Highwall Mining [Member]
San Juan Generating Station [Member]
Sep. 30, 2013
SJCC Arbitration [Member]
San Juan Generating Station [Member]
Sep. 30, 2013
SJCC Arbitration [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Sep. 30, 2013
NMTRD Coal Severance Tax [Member]
Four Corners [Member]
Sep. 30, 2013
NMTRD Coal Severance Tax [Member]
Four Corners [Member]
Public Service Company of New Mexico [Member]
Public Utilities, Commitments and Contingencies [Line Items]                                                    
Other current assets $ 37,404,000 $ 31,490,000 $ 32,294,000 $ 27,457,000   $ 15,800,000 $ 9,900,000                                      
Final Reclamation, capped amount to be collected                             100,000,000                      
Preliminary estimate increased deferral related to mine fire incident                                         21,600,000          
Public Utilities, Insurance Recovery                                         18,700,000          
Public Utilities, Proposed Retroactive Surface Mining Royalty Rate                                           12.50%        
Public Utilities, Current Surface Mining Royalty Rate applied between 2000 and 2003                                           8.00%        
Public Utilities, Estimated Underpaid Surface Mining Royalties under proposed rate change                                           5,000,000        
Public Utilities, PNM Share Estimated Underpaid Surface Mining Royalties under proposed rate change                                           46.30%        
Public Utilities, SJCC Disputed Mining Costs                                             1,500,000.0      
Public Utilities, PNM Share of SJCC Disputed Mining Costs                                             700,000      
Public Utilities, PNM Share of SJCC Disputed Mining Costs to pass through FPPAC                                             500,000      
Public Utilities, Potential Unbilled Mining Costs Owed to SJCC                                             5,200,000.0      
Public Utilities, Potential Overbilled Mining Costs SJCC Owes to SJGS Owners                                             1,100,000.0      
Public Utilities, Potential Capital Improvements billed as Mining Costs to SJGS Owners                                             12,900,000.0      
Public Utilities, PNM Share of arbitration ruling                                               46.30%    
Public Utilities, FFPAC Percentage of mining costs overbilled or unbilled ruled by arbitration                                               33.00%    
Public Utilities, FFPAC Percentage of capital improvements billed as mining costs ruled by arbitration                                               25.00%    
Public Utilities, Assessed Coal Severance Surtax Penalty and Interest                                                 30,000,000  
Public Utilities, PNM Share Assessed Coal Severance Surtax Penalty and Interest to pass through FFPAC                                                   8.00%
Public Utilities, Liability Insurance Coverage                       13,600,000,000 375,000,000 13,200,000,000                        
Public Utilities, Ownership Percentage in Nuclear Reactor                     10.20%                              
Public Utilities, Maximum Potential Assessment Per Incident                     38,900,000                              
Public Utilities, Annual Payment Limitation Related to Incident                     5,700,000                              
Public Utilities, Aggregate Amount of All Risk Insurance                     2,750,000,000                              
Public Utilities, Sublimit Amount under Nuclear Electric Insurance Limited                     1,500,000,000                              
Public Utilities, Maximum Amount under Nuclear Electric Insurance Limited                     4,300,000                              
Public Utilities, Lease ownership percentage in EIP                 60.00% 40.00%                                
Public Utilities, Option to Purchase Leased Capacity At Fair Value         7,700,000                                          
Loss Contingency, Estimate of Possible Loss                                 56,900,000     19,700,000            
Loss Contingency Accrual, at Carrying Value                             23,700,000 26,800,000   4,600,000 4,200,000              
Regulatory Assets               $ 100,000,000