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Regulatory and Rate Matters (Details) (USD $)
 1 Months Ended 3 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended
Sep. 30, 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]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
mw
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Minimum [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Maximum [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Wind Energy [Member]
Minimum [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Solar Energy [Member]
Minimum [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Renewable Technologies [Member]
Minimum [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Distributed Generation [Member]
Minimum [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2006 [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2011 [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2015 [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2015 [Member]
Distributed Generation [Member]
Minimum [Member]
Sep. 30, 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]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Per KWh [Member]
Amended [Member]
Minimum [Member]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Per kilowatt [Member]
Amended [Member]
Minimum [Member]
Sep. 30, 2012
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]
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Renewable Energy Rider [Member]
Sep. 30, 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
Jul. 03, 2012
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]
Jun. 30, 2011
Texas-New Mexico Power Company [Member]
Interest Rate Compliance Tariff [Member]
Sep. 30, 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]
Jun. 30, 2012
Texas-New Mexico Power Company [Member]
ERCOT Transmission Rates [Member]
Oct. 31, 2011
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]
Aug. 23, 2012
Texas-New Mexico Power Company [Member]
Transmission Cost of Service Rates [Member]
Oct. 05, 2012
Filing of Energy Efficiency Program [Member]
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Disincentives / Incentives Adder [Member]
Rate Matters [Line Items]                                                                            
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%       3.00%                                                  
Public Utilities, Reasonable Cost Threshold       2.00% 3.00%                                                                  
Public Utilities, Annual Incremental Increase in Reasonable Cost Threshold     0.25%                                                                      
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, Number of Mega Watts of Solar PV Capacity     20                                                                      
Public Utilities, Estimated Cost of Mega Watts of Solar PV Capacity     45,500,000                                                                      
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
Public Utilities, Rate Adder Allowed                                 0.01 10   0.002 4                                  
Public Utilities, Rate Rider Recovered                             2,600,000                                              
Public Utilities, Regulatory Costs Approved                               4,200,000             72,100,000                 113,300,000            
Public Utilities, Eliminated Recovery of Adder Revenue                                     1,300,000                                      
Public Utilities, Regulatory Costs to be Collected                                           38,800,000                                
Public Utilities, Regulatory Costs Incurred and Eligible For Recovery, Amount Deferred for Collection in Future Period                                           28,800,000                                
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, 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, Planning Period Covered of IRP                                                   20 years                        
Public Utilities, Number of protests that were filed to IRP requesting rejection of the plan                                                   2                        
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, Regulatory Rate Increase                                                         0.398                  
Public Utilities, Temporary Suspension Period                                                         5 months                  
Public Utilities, Proposed Rate                                                           0.0831 0.0831              
Public Utilities, Regulatory Disallowance Before Income Taxes                                                           3,900,000                
Public Utilities, Collection of Deployment Costs Through Surcharge Period                                                               12 years            
Public Utilities, Completion Period of Advanced Meter Deployment                                                               5 years            
Public Utilities, Increase Annual Transmission Service Revenue                                                     2,900,000                   2,500,000  
Litigation Settlement, Gross                                                                   1,600,000        
Gain Contingency, Additional Transmission Costs Requested                                                                 3,200,000   1,600,000 1,600,000    
Public Utilities, Requested Increase in Total Base to Reflect Changes in Invested Capital                                                                         $ 26,400,000