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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
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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 |

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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | pnm_RateMattersLineItems
Namespace Prefix: | pnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulated Operations, Percentage of Renewable Energy in Portfolio + References No definition available. + Details
Name: | pnm_RegulatedOperationsPercentageOfRenewableEnergyInPortfolio
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of regulatory costs not yet approved by the regulatory authority. + References No definition available. + Details
Name: | us-gaap_AmountOfRegulatoryCostsNotYetApproved
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. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration