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Commitments and Contingencies (Other Commitments and Contingencies) (Details) (USD $)
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
NMTRD Coal Severance Tax [Member]
Four Corners [Member]
Sep. 30, 2014
San Juan Generating Station [Member]
Continuous Highwall Mining [Member]
Sep. 30, 2014
San Juan Generating Station [Member]
SJCC Arbitration [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Plant [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Plant [Member]
Commercial Providers [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Plant [Member]
Industry Wide Retrospective Assessment Program [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Maximum [Member]
Nuclear Plant [Member]
Apr. 01, 2014
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Maximum [Member]
Nuclear Plant [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
San Juan Underground Mine Fire [Member]
Fuel and Purchased Power Adjustment Clause [Member]
San Juan Generating Station [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
San Juan Underground Mine Fire [Member]
Fuel and Purchased Power Adjustment Clause [Member]
San Juan Generating Station [Member]
Minimum [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
San Juan Underground Mine Fire [Member]
Fuel and Purchased Power Adjustment Clause [Member]
San Juan Generating Station [Member]
Maximum [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
NMTRD Coal Severance Tax [Member]
Four Corners [Member]
Apr. 02, 2014
Public Service Company of New Mexico [Member]
Navajo Nation Allottee Matters [Member]
Allotment_Parcel
Jan. 06, 2014
Public Service Company of New Mexico [Member]
Navajo Nation Allottee Matters [Member]
Allotment_Parcel
Sep. 01, 2012
Public Service Company of New Mexico [Member]
Navajo Nation Allottee Matters [Member]
Allotment_Parcel
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Surface [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
San Juan Generating Station [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
San Juan Generating Station [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
Coal Supply [Member]
San Juan Generating Station [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Coal Supply [Member]
San Juan Generating Station [Member]
Sep. 30, 2014
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
SJCC Arbitration [Member]
Public Utilities, Commitments And Contingencies [Line Items]                                                      
Other Assets, Current $ 55,277,000 $ 34,590,000                                             $ 26,100,000 $ 12,300,000  
Public Utilities, Estimated Increase in Coal Cost, Percentage                                                 21.00%    
Loss Contingency, Estimate of Possible Loss                                         53,900,000     93,300,000      
Loss Contingency Accrual                                     22,900,000 23,800,000   8,400,000 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                                            
Public Utilities, Potential Overbilled Mining Costs SJCC Owes to SJGS Owners         1,100,000                                            
Public Utilities, Potential Capital Improvements billed as Mining Costs to SJGS Owners         13,900,000                                            
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             375,000,000 13,200,000,000 13,600,000,000                                    
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