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Regulatory and Rate Matters (Details) (USD $)
0 Months Ended0 Months Ended1 Months Ended1 Months Ended7 Months Ended0 Months Ended9 Months Ended1 Months Ended1 Months Ended1 Months Ended1 Months Ended0 Months Ended3 Months Ended9 Months Ended3 Months Ended0 Months Ended
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Maximum [Member]
Renewable Portfolio Standard [Member]
May 03, 2010
Public Service Company of New Mexico [Member]
Maximum [Member]
NMPRC Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Per KWh [Member]
Jun. 23, 2011
Public Service Company of New Mexico [Member]
Maximum [Member]
2010 Energy Efficiency Application [Member]
Per KWh [Member]
Originally Filed [Member]
Jun. 23, 2011
Public Service Company of New Mexico [Member]
Maximum [Member]
2010 Energy Efficiency Application [Member]
Per kilowatt [Member]
Originally Filed [Member]
Apr. 15, 2011
Public Service Company of New Mexico [Member]
Maximum [Member]
Rates For Former TNMP Customers in New Mexico [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Minimum [Member]
Renewable Portfolio Standard [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Minimum [Member]
Renewable Portfolio Standard [Member]
Wind Energy [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Minimum [Member]
Renewable Portfolio Standard [Member]
Solar Energy [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Minimum [Member]
Renewable Portfolio Standard [Member]
Renewable Technologies [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Minimum [Member]
Renewable Portfolio Standard [Member]
Distributed Generation [Member]
May 03, 2010
Public Service Company of New Mexico [Member]
Minimum [Member]
NMPRC Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Per KWh [Member]
Jun. 23, 2011
Public Service Company of New Mexico [Member]
Minimum [Member]
2010 Energy Efficiency Application [Member]
Per KWh [Member]
Amended [Member]
Jun. 23, 2011
Public Service Company of New Mexico [Member]
Minimum [Member]
2010 Energy Efficiency Application [Member]
Per kilowatt [Member]
Amended [Member]
Apr. 15, 2011
Public Service Company of New Mexico [Member]
Minimum [Member]
Rates For Former TNMP Customers in New Mexico [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Emergency FPPAC [Member]
Aug. 31, 2010
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
mw
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
mw
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2006 [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2011 [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2015 [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Required Percentage by 2020 [Member]
Jul. 31, 2010
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Wind Energy [Member]
Originally Filed [Member]
mwh
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Wind Energy [Member]
Amended [Member]
mwh
Dec. 06, 2010
Public Service Company of New Mexico [Member]
Renewable Portfolio Standard [Member]
Wind Energy [Member]
Amended [Member]
Aug. 21, 2011
Public Service Company of New Mexico [Member]
NMPRC Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Aug. 28, 2011
Public Service Company of New Mexico [Member]
NMPRC Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Dec. 29, 2010
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 31, 2010
Public Service Company of New Mexico [Member]
NMPRC Rulemaking on Disincentives to Energy Efficiency Programs [Member]
May 05, 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 kilowatt [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Jul. 27, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Sep. 15, 2010
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Oct. 03, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Regulatory Matters Evidentiary Hearing [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Regulatory Matters Evidentiary Hearing [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Program Costs [Member]
Apr. 15, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Originally Filed [Member]
Apr. 15, 2011
Public Service Company of New Mexico [Member]
2010 Energy Efficiency Application [Member]
Amended [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Aug. 08, 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]
Immediate Enaction [Member]
Feb. 03, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Enaction Beginning 2012 [Member]
Feb. 03, 2011
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Capital Expenditures [Member]
Jun. 30, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm North [Member]
Jun. 30, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm North [Member]
Phase One [Member]
May 31, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm North [Member]
Phase One [Member]
Jun. 30, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm North [Member]
Phase Two [Member]
May 31, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm North [Member]
Phase Two [Member]
Jun. 30, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm South [Member]
Jun. 30, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm South [Member]
Phase One [Member]
May 31, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm South [Member]
Phase One [Member]
Jun. 30, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm South [Member]
Phase Two [Member]
May 31, 2010
Public Service Company of New Mexico [Member]
2010 Electric Rate Case [Member]
Pnm South [Member]
Phase Two [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]
Wholesale Power Rate Case [Member]
Jun. 24, 2011
Texas-New Mexico Power Company [Member]
Competitive Transition Charge True-Up Proceeding [Member]
Dec. 31, 2004
Texas-New Mexico Power Company [Member]
Competitive Transition Charge True-Up Proceeding [Member]
Stranded Costs [Member]
Sep. 30, 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]
May 18, 2011
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Feb. 26, 2011
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
May 26, 2010
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Feb. 26, 2011
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Capital Expenditures [Member]
May 26, 2010
Texas-New Mexico Power Company [Member]
Advanced Meter System Deployment and Surcharge Request [Member]
Capital Expenditures [Member]
Jan. 27, 2011
Texas-New Mexico Power Company [Member]
Rate Case, 2010 [Member]
Aug. 26, 2010
Texas-New Mexico Power Company [Member]
Rate Case, 2010 [Member]
May 26, 2011
Texas-New Mexico Power Company [Member]
Rate Case Expense Proceeding, 2010 [Member]
Oct. 27, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Jun. 23, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Apr. 29, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Oct. 27, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Related to Performance Goal [Member]
Apr. 29, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Related to Performance Goal [Member]
Sep. 30, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Originally Filed [Member]
mw
Sep. 30, 2011
Texas-New Mexico Power Company [Member]
Energy Efficiency [Member]
Amended [Member]
mw
Sep. 30, 2011
Emergency FPPAC [Member]
Sep. 30, 2011
NMPRC Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Aug. 11, 2011
NMPRC Rulemaking on Disincentives to Energy Efficiency Programs [Member]
Aug. 11, 2011
Rate Case, 2010 [Member]
Oct. 05, 2011
ERCOT Transmission Rates [Member]
Rate Matters [Line Items]                                                                                   
Amount of Regulatory Costs Not yet Approved              $ 8,000,000        $ 5,500,000     $ 6,200,000    $ 32,900,000        $ 165,200,000  $ 20,000,000  $ 111,100,000 $ 41,700,000  $ 8,700,000 $ 3,600,000$ 11,100,000$ 8,700,000     $ 126,100,000$ 157,900,000$ 70,200,000$ 70,600,000 $ 20,100,000   $ 4,400,000 $ 300,000       
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 Threshold3.00%    2.00%                                                                             
Public Utilities, Annual Incremental Increase in Reasonable Cost Threshold                0.25%                                                                  
Public Utilities, Procurment of Energy, Nonmonetary               22     250,000423,860                                                            
Public Utilities, Regulatory Costs Approved                107,700,000        2,600,000 4,200,000      31,400,000      72,100,000                     113,300,000    10,250,000 2,800,0003,400,000  300,000        
Public Utilities, Pre-Tax Loss Not to be Recovered                                                                              10,000,0007,500,000   
Litigation Settlement, Gross                                                                                  1,600,000
Public Utilities, Current Operational Usage                17                                                                  
Public Utilities, Estimated Operational Usage in Current Fiscal Year                5                                                                  
Public Utilities, Rate Adder Allowed 0.010.00510      0.0050.0024                 100.022620.03018     0.024410.02839                                           
Public Utilities, Eliminated Recovery of Adder Revenue                                                                                2,500,0001,600,000 
Public Utilities, Regulatory Rate Recommended For Recovery                            4,200,000             85,000,000                                        
Public Utilities, Rate Rider to be Implemented                          4,200,000    22,800,000     17,100,000                                             
Public Utilities, Rate Rider Recovered                        2,600,000                                                          
Public Utilities, Adder Revenue to be Implemented                               3,800,000 1,900,000                                                 
Public Utilities, Rate Rider Adjustment                                       2,600,000                                           
Public Utilities, Regulatory Costs That Have Exceeded Approved Costs                               1,400,000                                                   
Public Utilities, Percent of Regulatory Costs in Excess of Approved                               0.25                                                   
Public Utlitiles, Judgement Amount for Recovery of Under-collected Past Program Costs                                   2,400,000                                               
Public Utilities, Spending on Residential Load Management Program in Excess of Approved Budget                                    300,000                                              
Public Utilities, Percentage Over the Approved Budget for Residential Load Management Program                                    125.00%                                              
Public Utilities, Regulatory Rate Increase    0.56        0.40                                 0.220.16 0.06 0.200.14 0.06  0.398                        
Public Utilities, Regulatory Costs Proposed, Stipulation Increase                                            45,000,00040,000,000                                     
Public Utilities, Collection of Regulatory Costs Forgoed of Under Collected Amount                                        10,000,000                                          
Regulatory Assets                                                            87,300,000                      
Regulatory Assets, Proposed by Company                                                           0                       
Public Utilities, Proposed Rate                                                              0.0831                    
Public Utilities, Regulatory Disallowance Before Income Taxes                                                             3,900,000                     
Public Utilities, Return on Equity                                                                    0.10125              
Public Utitlities, Debt to Equity Capital Structure, Debt                                                                    0.55              
Public Utilities, Debt to Equity Capital Structure, Equity                                                                    0.45              
Amount of Regulatory Costs Not Included From Original Filing                                                                        $ 400,000          
Demand Savings Goal                                                                            5.94.8