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Regulatory and Rate Matters (Details) (USD $)
 1 Months Ended 0 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Emergency FPPAC [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Minimum [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Maximum [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Wind Energy [Member]
Minimum [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Solar Energy [Member]
Minimum [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Renewable Technologies [Member]
Minimum [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Distributed Generation [Member]
Minimum [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2006 [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2011 [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2015 [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2020 [Member]
Aug. 20, 2011
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]
Aug. 11, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Disincentives / Incentives Adder [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Per KWh [Member]
Amended [Member]
Minimum [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Per kilowatt [Member]
Amended [Member]
Minimum [Member]
Aug. 21, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Renewable Energy Rider [Member]
Mar. 31, 2012
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]
Protests_Filed
Aug. 31, 2011
Public Service Company of New Mexico [Member]
Transmission Rate Case [Member]
Oct. 31, 2010
Public Service Company of New Mexico [Member]
Transmission Rate Case [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Firm Requirements Wholesale Power Rate Case [Member]
Mar. 31, 2012
Texas-New Mexico Power Company [Member]
Interest Rate Compliance Tariff [Member]
Jul. 31, 2011
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Oct. 31, 2011
Texas-New Mexico Power Company [Member]
ERCOT Transmission Rates [Member]
Mar. 31, 2012
Texas-New Mexico Power Company [Member]
ERCOT Transmission Rates [Member]
Rate Matters [Line Items]                                                              
Amount of Regulatory Costs Not yet Approved $ 8,000,000                                                 $ 11,100,000 $ 8,700,000        
Public Utilities, Return on Equity                                                   0.1225          
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, Annual Incremental Increase in Reasonable Cost Threshold     0.25%                                                        
Public Utilities, Reasonable Cost Threshold       2.00% 3.00%                                                    
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, Rate Adder Allowed                               0.01 10   0.002 4                      
Public Utilities, Eliminated Recovery of Adder Revenue                                   1,300,000                          
Public Utilities, Regulatory Costs Approved                             4,200,000           72,100,000               113,300,000    
Public Utilities, Rate Rider Recovered                           2,600,000                                  
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              
Public Utilities, Number of protests that were filed to IRP requesting rejection of the plan                                               2              
Regulated Operating Revenue, Public Utilities, Proposed Annual Revenue Increase                                                 4,600,000            
Public Utilities, Proposed Return on Equity                                                 10.40%            
Public Utilities, Regulatory Rate Increase                                                     0.398        
Public Utilities, Proposed Rate                                                       0.0831      
Litigation Settlement, Gross                                                           $ 1,600,000 $ 1,100,000
Public Utilities, Temporary Suspension Period                                                     5 months        
Public Utilities, Collection of Deployment Costs Through Surcharge Period                                                         12 years    
Public Utilities, Completion Period of Advanced Meter Deployment                                                         5 years