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Commitments and Contingencies (Other Commitments and Contingencies) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Mar. 31, 2014
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Coal Supply [Member]
Dec. 31, 2013
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Coal Supply [Member]
Mar. 31, 2014
Surface [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Nuclear Plant [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Apr. 01, 2014
Nuclear Plant [Member]
Maximum [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Nuclear Plant [Member]
Maximum [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Nuclear Plant [Member]
Commercial Providers [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Nuclear Plant [Member]
Industry Wide Retrospective Assessment Program [Member]
Palo Verde Nuclear Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Loss on Long-term Purchase Commitment [Member]
Surface [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Loss on Long-term Purchase Commitment [Member]
Surface [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Loss on Long-term Purchase Commitment [Member]
Surface [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Loss on Long-term Purchase Commitment [Member]
Underground [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Loss on Long-term Purchase Commitment [Member]
Underground [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Loss on Long-term Purchase Commitment [Member]
Underground [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
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]
Mar. 31, 2014
San Juan Underground Mine Fire [Member]
Maximum [Member]
Fuel and Purchased Power Adjustment Clause [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
San Juan Underground Mine Fire [Member]
Minimum [Member]
Fuel and Purchased Power Adjustment Clause [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
Continuous Highwall Mining [Member]
San Juan Generating Station [Member]
Mar. 31, 2014
SJCC Arbitration [Member]
San Juan Generating Station [Member]
Mar. 31, 2014
SJCC Arbitration [Member]
San Juan Generating Station [Member]
Public Service Company of New Mexico [Member]
Mar. 31, 2014
NMTRD Coal Severance Tax [Member]
Four Corners [Member]
Mar. 31, 2014
NMTRD Coal Severance Tax [Member]
Four Corners [Member]
Public Service Company of New Mexico [Member]
Jan. 06, 2014
Navajo Nation Allottee Matters [Member]
Public Service Company of New Mexico [Member]
Allotment_Parcel
Public Utilities, Commitments and Contingencies [Line Items]                                                      
Other current assets $ 44,689,000 $ 34,590,000 $ 40,498,000 $ 30,510,000 $ 16,000,000 $ 12,300,000                                          
Public Utilities, Estimated Increase in Coal Cost, Percentage         21.00%                                            
Final Reclamation, capped amount to be collected                         100,000,000                            
Preliminary estimate increased deferral related to mine fire incident                                       21,600,000 17,400,000            
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, 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, Liability Insurance Coverage Sublimit                 2,250,000,000                                    
Public Utilities, Maximum Amount under Nuclear Electric Insurance Limited               4,800,000                                      
Loss Contingency, Estimate of Possible Loss                             55,100,000     93,300,000                  
Loss Contingency Accrual, at Carrying Value                         23,600,000 23,800,000   7,900,000 7,800,000                    
Regulatory Assets             $ 100,000,000                                        
Number of allotment parcels' appraisal requested for review                                                     58