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Regulatory and Rate Matters (Details) (USD $) |  |  |  | 0 Months Ended |  |  |  |  | 0 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 7 Months Ended |  |  |  |  |  |  |  |  |  |  | 0 Months Ended | 9 Months Ended |  |  |  |  |  |  |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  |  | 0 Months Ended |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 3 Months Ended |  | 0 Months Ended
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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 Threshold | 3.00% |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Annual Incremental Increase in Reasonable Cost Threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Procurment of Energy, Nonmonetary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22 |  |  |  |  |  | 250,000 | 423,860 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 2,800,000 | 3,400,000 |  |  | 300,000 |  |  |  |  |  |  |  |
Public Utilities, Pre-Tax Loss Not to be Recovered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 | 7,500,000 |  |  |
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 |  | 0.01 | 0.005 | 10 |  |  |  |  |  |  | 0.005 | 0.002 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 0.02262 | 0.03018 |  |  |  |  |  | 0.02441 | 0.02839 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Eliminated Recovery of Adder Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 | 1,600,000 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.22 | 0.16 |  | 0.06 |  | 0.20 | 0.14 |  | 0.06 |  |  | 0.398 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Regulatory Costs Proposed, Stipulation Increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000,000 | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.9 | 4.8 |  |  |  |  |

X
- Definition Amount of Regulatory Costs Not Included From Original Filing + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Demand Savings Goal + Details
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Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Adder Revenue to be Implemented + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Regulated Operations, Annual Incremental Increase in Reasonable Cost Threshold + Details
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- Definition Public Utilities, Collection of Regulatory Costs Forgoed of Under Collected Amount + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Public Utilities, Current Operational Usage + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Public Utilities, Debt to Equity Capital Structure, Equity + Details
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Data Type: | xbrli:decimalItemType
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- Definition Public Utilities, Eliminated Recovery of Adder Revenue + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Public Utilities, Estimated Operational Usage in Current Fiscal Year + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:decimalItemType
Balance Type: | na
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X
- Definition Public Utilities, Percentage Over the Approved Budget for Residential Load Management Program + Details
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Namespace Prefix: | pnm
Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition Public Utilities, Percent of Regulatory Costs in Excess of Approved + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Public Utilities, Pre-Tax Loss Not to be Recovered + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Regulated Operations, Initial Investment in Energy Facilities, Nonmonetary + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Proposed Rate + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Public Utilities, Rate Adder Allowed + Details
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Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Public Utilities, Rate Rider Adjustment + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Public Utilities, Rate Rider Recovered + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Rate Rider to be Implemented + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reasonable Cost Threshold + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Public Utility, Regulatory Costs Approved + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public Utilities, Regulatory Costs Proposed, Stipulation Increase + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public Utilities, Regulatory Costs That Have Exceeded Approved Costs + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public Utilities, Regulatory Disallowance Before Income Taxes + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Public Utilities, Regulatory Rate Increase + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Regulatory Rate Recommended For Recovery + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Regulated Operations, Required Percentage of Diversification + Details
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Period Type: | instant

X
- Definition Regulated Operations, Required Percentage of Renewable Energy in Portfolio to Electric Sales + Details
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Namespace Prefix: | pnm
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Public Utilities, Return on Equity + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Spending on Residential Load Management Program in Excess of Approved Budget + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utitlities, Debt to Equity Capital Structure, Debt + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utlitiles, Judgement Amount for Recovery of Under-collected Past Program Costs + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Rate Matters [Line Items] + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory Assets, Proposed by Company + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of regulatory costs not yet approved by the regulatory authority. + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period. + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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