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Regulatory and Rate Matters (Details) (USD $)
 12 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 8 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2011
Renewable Portfolio Standard [Member]
Aug. 11, 2011
Energy Efficient and Load Management [Member]
Disincentives / Incentives Adder [Member]
Aug. 11, 2011
2010 Rate Case [Member]
Jun. 18, 2010
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Emergency FPPAC [Member]
Jul. 02, 2009
Public Service Company of New Mexico [Member]
2008 Electric Rate Case [Member]
Jun. 30, 2009
Public Service Company of New Mexico [Member]
2008 Electric Rate Case [Member]
Sep. 30, 2008
Public Service Company of New Mexico [Member]
2008 Electric Rate Case [Member]
Mar. 31, 2009
Public Service Company of New Mexico [Member]
2008 Electric Rate Case [Member]
Apr. 02, 2010
Public Service Company of New Mexico [Member]
2008 Electric Rate Case [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, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Minimum [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Maximum [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Wind Energy [Member]
Minimum [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Solar Energy [Member]
Minimum [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Renewable Technologies [Member]
Minimum [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Distributed Generation [Member]
Minimum [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2006 [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2011 [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2015 [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2020 [Member]
Apr. 15, 2011
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Amended [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Program Costs [Member]
Aug. 21, 2011
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Disincentives / Incentives Adder [Member]
Nov. 29, 2010
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Disincentives / Incentives Adder [Member]
May 03, 2010
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Per KWh [Member]
Disincentives / Incentives Adder [Member]
Maximum [Member]
Jun. 23, 2011
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Per KWh [Member]
Disincentives / Incentives Adder [Member]
Amended [Member]
Minimum [Member]
May 03, 2010
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Per kilowatt [Member]
Disincentives / Incentives Adder [Member]
Jun. 23, 2011
Public Service Company of New Mexico [Member]
Energy Efficient and Load Management [Member]
Per kilowatt [Member]
Disincentives / Incentives Adder [Member]
Amended [Member]
Minimum [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Jun. 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]
Feb. 03, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Capital Expenditures [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Fuel [Member]
Feb. 03, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Immediate Enaction [Member]
Feb. 03, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Enaction Beginning 2012 [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Renewable Energy Rider [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Renewable Energy Rider [Member]
Maximum [Member]
Jul. 31, 2011
Public Service Company of New Mexico [Member]
2011 Integrated Resource Plan [Member]
Aug. 31, 2011
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]
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]
Dec. 31, 2010
Texas-New Mexico Power Company [Member]
Dec. 31, 2004
Texas-New Mexico Power Company [Member]
Competitive Transition Charge True-Up Proceeding [Member]
Stranded costs [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]
Dec. 31, 2009
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]
Jul. 02, 2011
Texas-New Mexico Power Company [Member]
2010 Rate Case Expense Proceeding [Member]
May 26, 2011
Texas-New Mexico Power Company [Member]
2010 Rate Case Expense Proceeding [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]
Jan. 31, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Mar. 31, 2010
Texas-New Mexico Power Company [Member]
Transmission Rate Filings [Member]
Jul. 31, 2011
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Rate Matters [Line Items]                                                                                                                              
Amount of Regulatory Costs Not yet Approved             $ 8,000,000                                                       $ 165,200,000 $ 20,000,000               $ 11,100,000 $ 8,700,000                   $ 20,100,000                
Regulated Operating Revenue, Public Utilities, Proposed Annual Revenue Increase                                                                                     4,600,000                                        
Public Utilities, Proposed Return on Equity                                                                                     10.40%                                        
Public Utilities, Additional Revenue from Proposed Rates                 77,100,000 123,300,000                                                                                   12,700,000                   33,800,000  
Public Utilities, Total Revenue Requirement Increase                                                                                                                           5,500,000  
Public Utilities, Approved Deployment Costs                                                                                                                             113,300,000
Public Utilities, Recovery Amount Restoration Costs of Hurricane Ike                                                                                                       17,600,000                      
Public Utilities, Recovery Period for Hurricane Ike Restoration Costs                                                                                                       5 years                      
Public Utilities, Write-Off of Restoration Costs of Hurricane Ike                                                                                                         700,000                    
Public Utilities, Implemented Increase in Non-Fuel Revenues, Percentage               65.00%       35.00%                                                                                                      
Public Utilities, Credit to Customers for Past Sales of SO2 Allowances                       26,300,000                                                                                                      
Public Utilities, Credit to Customers for Past Sales of SO2 Allowances, Credit Period               21 months                                                                                                              
Public Utilites, Off-System Sales Margins Credited Against FPPACC Costs               100.00%                                                                                                              
Public Utilities, Required Percentage of Renewable Energy in Portfolio to Electric Sales                                         5.00% 10.00% 15.00% 20.00%                                                                              
Public Utilities, Required Percentage of Diversification                                 20.00% 20.00% 10.00% 1.50%                                                                                      
Public Utilities, Reasonable Cost Threshold                             2.00% 3.00%                                                                                              
Public Utilities, Annual Incremental Increase in Reasonable Cost Threshold                         0.25%                                                                                                    
Public Utilities, Procurment of Energy, Nonmonetary                           22                                                                                                  
Public Utilities, Regulatory Costs Approved                         107,700,000                             4,200,000                                                   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                                                                                                    
Regulated Operations, Percentage of Renewable Energy in Portfolio                         7.30%                                                                                                    
Public Utilities, Statutory Percentage due to the RCT                         10.00%                                                                                                    
Public Utilities, Approved Program Implementation Costs                                                                                                                   3,400,000   2,700,000 2,600,000    
Public Utilities, Approved Program Implementation Costs, Bonus                                                                                                                   300,000          
Public Utilities, Pre-Tax Loss Not to be Recovered                                                                 7,500,000       10,000,000                                                    
Public Utilities, Rider Rate Percentage                                                                               2.081%                                              
Public Utilities, Rider Rate Percentage in 2013                                                                               2.695%                                              
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, Planning Period Covered of IRP                                                                                   20 years                                          
Litigation Settlement, Gross       1,300,000                                                                                                                      
Public Utilities, Rate Adder Allowed                                                         0.01 0.002 10 4                                                              
Public Utilities, Eliminated Recovery of Adder Revenue   1,300,000 1,600,000                                                                                                                        
Public Utilities, Regulatory Rate Recommended For Recovery                                                                   72,000,000                                                          
Public Utilities, Rate Rider to be Implemented                                                   17,100,000                                                                          
Public Utilities, Rate Rider Recovered                                                     2,600,000                                                                        
Public Utilities, Retention Percentage of Sales Margins                     25.00%                                                                                                        
Public Utilities, Credit Percentage Against Fuel and Purchased Power Costs                     75.00%                                                                                                        
Public Utilities, Rate Rider Adjustment                                                 2,600,000                                                                            
Public Utilities, Regulatory Rate Increase                                                                                         0.398                                    
Public Utilities, Temporary Suspension Period                                                                                           5 months                                  
Public Utilities, Regulatory Costs Proposed, Stipulation Increase                                                                           45,000,000 40,000,000                                                
Regulatory Assets, Total         396,867,000 393,779,000                                                                                 130,281,000 144,979,000 87,300,000                            
Public Utilities, Proposed Rate                                                                                                     0.0831                        
Public Utilities, Regulatory Disallowance Before Income Taxes                                                                                                   $ 3,900,000                          
Public Utilities, Return on Equity                                                                                       0.1225                   0.10125                  
Public Utitlities, Debt to Equity Capital Structure, Debt                                                                                                           0.55                  
Public Utilities, Debt to Equity Capital Structure, Equity                                                                                                           0.45                  
Public Utilities, Collection Period of Settlement                                                                                                               3 years              
Public Utilities, Recovery Period of Program Costs                                                                                                                     11 months        
Public Utilities, Collection of Deployment Costs Through Surcharge Period                                                                                                                             12 years
Public Utilities, Completion Period of Advanced Meter Deployment                                                                                                                             5 years