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Commitments and Contingencies (Other Commitments and Contingencies) (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Jun. 30, 2014
Coal Supply [Member]
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Dec. 31, 2013
Coal Supply [Member]
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Jun. 30, 2014
Surface [Member]
Public Service Company of New Mexico [Member]
Jun. 30, 2014
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Public Service Company of New Mexico [Member]
Jun. 30, 2014
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Jun. 30, 2014
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Public Service Company of New Mexico [Member]
Jun. 30, 2014
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Jun. 30, 2014
San Juan Underground Mine Fire [Member]
Fuel and Purchased Power Adjustment Clause [Member]
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Jun. 30, 2014
San Juan Underground Mine Fire [Member]
Fuel and Purchased Power Adjustment Clause [Member]
Minimum [Member]
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Jun. 30, 2014
San Juan Underground Mine Fire [Member]
Fuel and Purchased Power Adjustment Clause [Member]
Maximum [Member]
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Jun. 30, 2014
NMTRD Coal Severance Tax [Member]
Four Corners [Member]
Jun. 30, 2014
NMTRD Coal Severance Tax [Member]
Public Service Company of New Mexico [Member]
Four Corners [Member]
Apr. 02, 2014
Navajo Nation Allottee Matters [Member]
Public Service Company of New Mexico [Member]
Allotment_Parcel
Jan. 06, 2014
Navajo Nation Allottee Matters [Member]
Public Service Company of New Mexico [Member]
Allotment_Parcel
Sep. 01, 2012
Navajo Nation Allottee Matters [Member]
Public Service Company of New Mexico [Member]
Allotment_Parcel
Jun. 30, 2014
San Juan Generating Station [Member]
Continuous Highwall Mining [Member]
Jun. 30, 2014
San Juan Generating Station [Member]
SJCC Arbitration [Member]
Jun. 30, 2014
San Juan Generating Station [Member]
SJCC Arbitration [Member]
Public Service Company of New Mexico [Member]
Jun. 30, 2014
Nuclear Plant [Member]
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Jun. 30, 2014
Nuclear Plant [Member]
Maximum [Member]
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Apr. 01, 2014
Nuclear Plant [Member]
Maximum [Member]
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Jun. 30, 2014
Commercial Providers [Member]
Nuclear Plant [Member]
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Jun. 30, 2014
Industry Wide Retrospective Assessment Program [Member]
Nuclear Plant [Member]
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Public Utilities, Commitments And Contingencies [Line Items]                                                          
Other Assets, Current $ 54,026,000 $ 34,590,000 $ 49,385,000 $ 30,510,000 $ 21,600,000 $ 12,300,000                                              
Public Utilities, Estimated Increase in Coal Cost, Percentage         21.00%                                                
Loss Contingency, Estimate of Possible Loss                   54,600,000     93,300,000                                
Loss Contingency Accrual               23,300,000 23,800,000   8,200,000 7,800,000                                  
Final Reclamation, capped amount to be collected               100,000,000                                          
Regulatory Assets             100,000,000                                            
Estimated increased coal costs and deferral of cost recovery                             17,400,000 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, 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                                             13,900,000.0            
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, 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, Liability Insurance Coverage Sublimit                                                     2,250,000,000    
Public Utilities, Maximum Amount under Nuclear Electric Insurance Limited                                                 $ 4,800,000        
Number of landowners claiming to be Navajo allottees                                         43                
Number of allotment parcels' appraisal requested for review                                       58                  
Number of allotments where landowners are revoking rights of way renewal consents                                     6