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Regulatory and Rate Matters (Details) (USD $)
 12 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2012
Renewable Portfolio Standard [Member]
Aug. 11, 2011
2010 Rate Case [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Emergency FPPAC [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Aug. 31, 2010
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
mw
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
MW
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Minimum [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Maximum [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Wind Energy [Member]
Minimum [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Solar Energy [Member]
Minimum [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Renewable Technologies [Member]
Minimum [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Distributed Generation [Member]
Minimum [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2011 [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2015 [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2020 [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard Supplemental Procurement [Member]
MW
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard Supplemental Procurement Reduction [Member]
MW
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Program Costs [Member]
Oct. 05, 2012
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Disincentives / Incentives Adder [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Disincentives / Incentives Adder [Member]
Aug. 11, 2011
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Disincentives / Incentives Adder [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Per KWh [Member]
Amended [Member]
Minimum [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Per kilowatt [Member]
Amended [Member]
Minimum [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Aug. 21, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
May 31, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Fuel [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Electric Rate Case [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Electric Rate Case [Member]
Subsequent Event [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Energy Rider [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Energy Rider [Member]
Maximum [Member]
Aug. 20, 2011
Public Service Company of New Mexico [Member]
Nmprc Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Nmprc Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Nov. 29, 2010
Public Service Company of New Mexico [Member]
Nmprc Rulemaking on Disincentives to Energy Efficiency Programs [Member]
May 03, 2010
Public Service Company of New Mexico [Member]
Nmprc Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Per KWh [Member]
Maximum [Member]
May 03, 2010
Public Service Company of New Mexico [Member]
Nmprc Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Per kilowatt [Member]
Jul. 31, 2011
Public Service Company of New Mexico [Member]
2011 Integrated Resource Plan [Member]
Protests_Filed
Jul. 03, 2012
Public Service Company of New Mexico [Member]
Transmission Rate Case [Member]
Oct. 27, 2010
Public Service Company of New Mexico [Member]
Transmission Rate Case [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Formula Transmission Rate Case [Member]
Jan. 02, 2013
Public Service Company of New Mexico [Member]
Formula Transmission Rate Case [Member]
Subsequent Event [Member]
Dec. 06, 2012
Public Service Company of New Mexico [Member]
Firm Requirements Wholesale Power Rate Case [Member]
Sep. 15, 2011
Public Service Company of New Mexico [Member]
Firm Requirements Wholesale Power Rate Case [Member]
Nov. 30, 2011
Public Service Company of New Mexico [Member]
Firm Requirements Wholesale Power Rate Case [Member]
Dec. 31, 2011
Texas-New Mexico Power Company [Member]
Interest Rate Compliance Tariff [Member]
Jan. 31, 2008
Texas-New Mexico Power Company [Member]
Interest Rate Compliance Tariff [Member]
Jun. 30, 2009
Texas-New Mexico Power Company [Member]
2008 Rate Case [Member]
Mar. 31, 2010
Texas-New Mexico Power Company [Member]
2008 Rate Case [Member]
Jan. 27, 2011
Texas-New Mexico Power Company [Member]
2010 Rate Case [Member]
Aug. 26, 2010
Texas-New Mexico Power Company [Member]
2010 Rate Case [Member]
Jun. 30, 2012
Texas-New Mexico Power Company [Member]
Ercot Transmission Rates [Member]
Jun. 30, 2012
Texas-New Mexico Power Company [Member]
Ercot Transmission Rates [Member]
PUCT staff agreed to interim rate relief that will permit TNMP to add uncontested costs to its existing TCRF [Member]
Jun. 30, 2012
Texas-New Mexico Power Company [Member]
Ercot Transmission Rates [Member]
Permited to add costs in a subsequent TCRF if TNMP is successful in contested case [Member]
May 26, 2011
Texas-New Mexico Power Company [Member]
2010 Rate Case Expense Proceeding [Member]
Aug. 28, 2012
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Sep. 30, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Dec. 31, 2010
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Dec. 31, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Mar. 31, 2010
Texas-New Mexico Power Company [Member]
Transmission Rate Filings [Member]
Jan. 31, 2013
Texas-New Mexico Power Company [Member]
Transmission Rate Filings [Member]
Subsequent Event [Member]
Jul. 31, 2011
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Aug. 23, 2012
Texas-New Mexico Power Company [Member]
Transmission Cost of Service Rates [Member]
Dec. 31, 2012
Delta [Member]
Public Service Company of New Mexico [Member]
Applications for Approvals to Purchase Delta [Member]
MW
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, Procurment of Energy, Nonmonetary         22                                                                                                                    
Public Utilities, Regulatory Costs Approved           $ 107,700,000                                                       $ 4,200,000             $ 2,900,000               $ 10,250,000         $ 2,800,000                  
Public Utilities, Actual Regulatory Costs for Solar PV Facilities and Demonstration Project 95,000,000                                                                                                                            
Public Utilites, Additional Renewable Procurements Spending Required by NMPRC       900,000                                                                                                                      
Public Utilities, Number of Mega Watts of Solar Photovoltaic Capacity           20                   2 1.5                                                                                            
Public Utilities, Estimated Cost of Mega Watts of Solar Photovoltaic Capacity           45,500,000                   4,500,000                                                                                              
Public Utilities, Additional Revenue To be Collected in 2012                                                             18,000,000                                                                
Public Utilities, Additional Revenue To be Collected in 2013                                                             24,600,000                                                                
Public Utilities, Rider Condition of Earned Return on Jurisdictional Equity in 2013                                                             10.50%                                                                
Public Utilities, Approved Rider Rate For 2012                                                           0.0022335                                                                  
Public Utilities, Approved Rider Rate For 2013                                                           0.0028371                                                                  
Public Utilities, Order Disapproved Recovery of Costs As Regulatory Agency Had Not Acted on Specific Procurements Proposed                                                           900,000                                                                  
Public Utilities, Rate Rider to be Implemented                                   17,100,000                                                                                          
Public Utilities, Rate Rider Recovered                                                               2,600,000 2,600,000                                                            
Public Utilities, Program Costs Related To Energy Efficiency                                     22,500,000                                                                                        
Public Utilities, Proposed Profit Incentive Adder Revenues Related To Energy Efficiency Program                                     4,200,000 2,900,000                                                                                      
Public Utilities, Rate Adder Allowed                                           0.002 4                       0.01 10                                                      
Public Utilities, Eliminated Recovery of Adder Revenue   1,600,000                                     1,300,000                                                                                    
Amount of Regulatory Costs Not yet Approved     8,000,000                                             165,200,000                         11,100,000 3,200,000     8,700,000             20,100,000                          
Public Utilites, Number of Mega Watts Natural Gas Peaking Units to be Purchased                                                                                                                             132
Public Utilities, Regulatory Rate Recommended For Recovery                                                 72,100,000                                                                            
Public Utilities, Regulatory Costs to be Collected                                                       38,800,000 36,200,000                                                                    
Public Utilities, Regulatory Costs Incurred and Eligible For Recovery, Amount Deferred for Collection in Future Period                                                       41,000,000                                                                      
Public Utilities, Pre-Tax Loss Not to be Recovered                                               7,500,000     10,000,000                                                                        
Public Utilities, Planning Period Covered of IRP                                                                         20 years                                                    
Public Utilities, Number of protests that were filed to IRP requesting rejection of the plan                                                                         2                                                    
Public Utilities, Additional Revenue from Proposed Rates                                                                                             77,100,000                       33,800,000 21,900,000      
Public Utilities, Additional Revenue from Proposed Rates, Percentage Implemented                                                                                             65.00% 35.00%                              
Public Utilities, Amount Credited to Ratepayers                                                                                             26,300,000                                
Public Utilities, Period Amount Credit to Ratepayers                                                                                             21 months                                
Public Utilities, Return on Equity                                                                             0.1225 0.1081                 0.10125                            
Public Utilities, Increase Annual Transmission Service Revenue                                                                           2,900,000                                               2,500,000  
Public Utilities, Regulatory Rate Increase                                                                                     0.398                                        
Public Utilities, Temporary Suspension Period                                                                                       5 months                                      
Public Utilities, Total Revenue Requirement Increase                                                                                   5,300,000                                 5,500,000 2,900,000      
Public Utilities, Requested Increase in Total Base to Reflect Changes in Invested Capital                                                                                                                           26,400,000  
Public Utilities, Contract Extension                                                                                   10 years                                          
Public Utilities, Proposed Rate                                                                                           0.0831                                  
Public Utilities, Regulatory Disallowance Before Income Taxes                                                                                         3,900,000                                    
Public Utitlities, Debt to Equity Capital Structure, Debt                                                                                                 0.55                            
Public Utilities, Debt to Equity Capital Structure, Equity                                                                                                 0.45                            
Public Utilities, Approved Deployment Costs                                                                                                                         113,300,000    
Public Utilities, Collection of Deployment Costs Through Surcharge Period                                                                                                                         12 years    
Public Utilities, Completion Period of Advanced Meter Deployment                                                                                                                         5 years    
Gain Contingency, Additional Transmission Costs Requested                                                                                                     3,200,000 1,600,000 1,600,000                    
Public Utilities, Approved Program Implementation Costs                                                                                                             4,800,000 3,400,000 2,600,000 2,700,000          
Public Utilities, Approved Program Implementation Costs, Bonus                                                                                                             $ 400,000 $ 300,000              
Public Utilities, Recovery Period of Program Costs                                                                                                                 11 months