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Regulatory and Rate Matters (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Public Service Company of New Mexico [Member]
La Luz Generating Station [Member]
MW
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Maximum [Member]
Jun. 30, 2013
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Maximum [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Wind Energy [Member]
Minimum [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Solar Energy [Member]
Minimum [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Renewable Technologies [Member]
Minimum [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Distributed Generation [Member]
Minimum [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2011 [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2015 [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2020 [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
2014 Wind generated Renewable Energy Credits [Member]
MWh
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard 2014 [Member]
MW
Jun. 30, 2014
Public Service Company of New Mexico [Member]
2015 Wind generated Renewable Energy Credits [Member]
MWh
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard 2015 [Member]
MW
Oct. 05, 2012
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Disincentives / Incentives Adder [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Disincentives / Incentives Adder [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
FPPAC Continuation Application [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Renewable Energy Rider [Member]
Maximum [Member]
Jul. 31, 2011
Public Service Company of New Mexico [Member]
Integrated Resource Plan, 2011 [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Integrated Resource Plan, 2011 [Member]
May 02, 2014
Public Service Company of New Mexico [Member]
Formula Transmission Rate Case [Member]
Jun. 03, 2013
Public Service Company of New Mexico [Member]
Formula Transmission Rate Case [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
Formula Transmission Rate Case [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
City of Gallup, New Mexico Contract [Member]
Jun. 30, 2014
Public Service Company of New Mexico [Member]
City of Gallup, New Mexico Contract [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
City of Gallup, New Mexico Contract [Member]
Jul. 30, 2011
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Jun. 30, 2014
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
customer
Jun. 30, 2014
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Minimum [Member]
Jun. 30, 2014
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Maximum [Member]
Aug. 28, 2012
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Jun. 30, 2014
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Jan. 31, 2013
Texas-New Mexico Power Company [Member]
Transmission Rate Filings [Member]
Jun. 30, 2014
Texas-New Mexico Power Company [Member]
August 2013 Transmission Rate Filings [Member]
Jun. 30, 2014
Texas-New Mexico Power Company [Member]
January 2014 Transmission Rate Filings [Member]
Jun. 30, 2014
Texas-New Mexico Power Company [Member]
July 2014 Transmission Rate Filings [Member]
Jun. 30, 2014
Delta [Member]
Public Service Company of New Mexico [Member]
Applications for Approvals to Purchase Delta [Member]
MW
Dec. 20, 2013
San Juan Generating Station Unit 3 [Member]
Public Service Company of New Mexico [Member]
Clean Air Act, SNCR [Member]
MW
Jun. 26, 2014
San Juan Generating Station Unit 4 [Member]
Public Service Company of New Mexico [Member]
Clean Air Act, SNCR [Member]
MW
Dec. 20, 2013
San Juan Generating Station Unit 4 [Member]
Public Service Company of New Mexico [Member]
Clean Air Act, SNCR [Member]
MW
Jun. 30, 2014
Four Corners [Member]
Public Service Company of New Mexico [Member]
Right of first refusal [Member]
Rate Matters [Line Items]                                                                                      
Public Utilities, Required Percentage of Renewable Energy in Portfolio to Electric Sales               10.00% 15.00% 20.00%                                                                  
Public Utilities, Required Percentage of Diversification       30.00% 20.00% 5.00% 1.50%                                                                        
Public Utilities, Reasonable Cost Threshold   3.00% 3.00%                                                                                
Public Utilities, Number of Mega Watts of Solar PV Capacity                       23   40                                                          
Public Utilities, Number of Mega Watts of Wind Energy Capacity                       102                                                              
Public Utilities, First Year Cost of Wind Capacity Planned Purchase Agreement                       $ 5,800,000.0                                                              
Public Utilities, Number of Mega Watt Hours of Wind Generation                     50,000   120,000                                                            
Public Utilities, Annual Revenue To be Collected Under Current Rider Rate                                       34,600,000                                              
Public Utilities, Estimated Cost of Mega Watts of Solar PV Capacity                       46,700,000   79,300,000                                                          
Public Utilities, Wind Capacity Planned Purchase Agreement Term                       20 years                                                              
Public Utilities, Program Costs Related To Energy Efficiency                             22,500,000                                                        
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program, Percentage of Program Costs                               7.60%                                                      
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program                               1,700,000                                                      
Percentage ownership of EIP transmission line                                                 60.00%                                    
Public Utilities, Rider Condition of Earned Return on Jurisdictional Equity in 2013                                       10.50%                                              
Public Utilities, Planning Period Covered of IRP                                         20 years                                            
Amount of Regulatory Costs Not yet Approved                                                 3,200,000                                    
Public Utilities, Requested Rate Increase (Decrease), Amount                                             500,000 1,300,000                                      
Public Utilities, Number of Mega Watts Natural Gas Peaking Units to be Purchased                                                                             132        
Public Utilities, Number of Mega Watts of Gas-fired Generation 40                                                                                    
Public Utilities, Rate Base Value 56,000,000                                                                                    
Public Utilities, Additional Ownership To Be Obtained, in Megawatts                                                                               78      
Public Utilities, Additional Ownership To Be Obtained, in Megawatts                                                                                 132 78  
Percentage of ownership held by exiting owners                                                                                     7.00%
Period of time to file a waiver of rights of first refusal                                                                                     120 days
Public Utilities, Return on Equity                                                 10.81%                                    
Public Utilities, Collection of Deployment Costs Through Surcharge Period                                                         12 years                            
Public Utilities, Completion Period of Advanced Meter Deployment                                                         5 years                            
Public Utilities, Non-standard metering service cost total to be borne by opt-out customers                                                           0                          
Public Utilities, Approved Non-standard metering service cost initial fee range                                                             63.97 168.61                      
Public Utilities, Non-standard metering service cost initial fee range                                                             142.84 247.48                      
Public Utilities, Non-standard metering ongoing expenses total to be borne by opt-out customers                                                           500,000                          
Public Utilities, Approved Non-standard metering ongoing expenses monthly charge                                                           36.78                          
Presumed number of customers that will elect non-standard meter service                                                           1,081                          
Public Utilities, Non-standard metering ongoing expenses monthly charge                                                           38.99                          
Public Utilities, Additional Revenue from Proposed Rates                                                                     21,900,000 18,100,000 18,200,000 25,200,000          
Public Utilities, Total Revenue Requirement Increase                                                                     2,900,000 2,800,000 2,900,000 4,200,000          
Public Utilities, Revenue For Power Sold Under Specific Contract                                                   2,900,000 6,100,000 11,700,000                              
Public Utilities, Approved Deployment Costs                                                         113,300,000                            
Public Utilities, Approved Program Implementation Costs, Bonus                                                                 5,200,000                    
Public Utilities, Unapproved 2014 Program Implementation Costs                                                                   5,600,000                  
Public Utilities, Unapproved 2015 Program Implementation Costs                                                                   5,700,000                  
Public Utilities, Retention Percentage of Sales Margins                                 10.00% 10.00%                                                  
Public Utilities, Under-collected balance write-off                                     $ 10,500,000                                                
Public Utilities, Period over which to write off remaining uncollected balance                                     18 months                                                
Public Utilities, Frequency of IRP filings                                           3 years