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Regulatory and Rate Matters (Details) (USD $) |  |  |  |  | 3 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  | 3 Months Ended | 1 Months Ended | 3 Months Ended | 0 Months Ended |  | 12 Months Ended |  | 1 Months Ended |  | 0 Months Ended |  | 1 Months Ended | 3 Months Ended |  |
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Mar. 31, 2014 Public Service Company of New Mexico [Member] La Luz Generating Station [Member] MW | Mar. 31, 2014 Public Service Company of New Mexico [Member] Renewable Portfolio Standard [Member] Maximum [Member] | Mar. 31, 2013 Public Service Company of New Mexico [Member] Renewable Portfolio Standard [Member] Maximum [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Renewable Portfolio Standard [Member] Wind Energy [Member] Minimum [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Renewable Portfolio Standard [Member] Solar Energy [Member] Minimum [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Renewable Portfolio Standard [Member] Renewable Technologies [Member] Minimum [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Renewable Portfolio Standard [Member] Distributed Generation [Member] Minimum [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] Renewable Portfolio Standard [Member] Required Percentage by 2011 [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] Renewable Portfolio Standard [Member] Required Percentage by 2015 [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] Renewable Portfolio Standard [Member] Required Percentage by 2020 [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] 2014 Wind generated Renewable Energy Credits [Member] MWh | Mar. 31, 2014 Public Service Company of New Mexico [Member] Renewable Portfolio Standard 2014 [Member] MW | Mar. 31, 2014 Public Service Company of New Mexico [Member] 2015 Wind generated Renewable Energy Credits [Member] MWh | Oct. 05, 2012 Public Service Company of New Mexico [Member] 2010 Energy Efficiency Application [Member] Disincentives / Incentives Adder [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] 2010 Energy Efficiency Application [Member] Disincentives / Incentives Adder [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] 2010 Electric Rate Case [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] FPPAC Continuation Application [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] Renewable Energy Rider [Member] | Apr. 25, 2014 Public Service Company of New Mexico [Member] Renewable Energy Rider [Member] | Jan. 02, 2014 Public Service Company of New Mexico [Member] Renewable Energy Rider [Member] | Mar. 31, 2014 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] | Mar. 31, 2014 Public Service Company of New Mexico [Member] Integrated Resource Plan, 2011 [Member] | May 02, 2014 Public Service Company of New Mexico [Member] Formula Transmission Rate Case [Member] | Jun. 03, 2013 Public Service Company of New Mexico [Member] Formula Transmission Rate Case [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] Formula Transmission Rate Case [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] City of Gallup, New Mexico Contract [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] City of Gallup, New Mexico Contract [Member] | Jul. 30, 2011 Texas-New Mexico Power Company [Member] Advanced Meter System Deployment and Surcharge Request [Member] | Mar. 31, 2014 Texas-New Mexico Power Company [Member] Advanced Meter System Deployment and Surcharge Request [Member] | Mar. 31, 2014 Texas-New Mexico Power Company [Member] Advanced Meter System Deployment and Surcharge Request [Member] Minimum [Member] | Mar. 31, 2014 Texas-New Mexico Power Company [Member] Advanced Meter System Deployment and Surcharge Request [Member] Maximum [Member] | Aug. 28, 2012 Texas-New Mexico Power Company [Member] Energy Efficiency [Member] | Mar. 31, 2014 Texas-New Mexico Power Company [Member] Energy Efficiency [Member] | Jan. 31, 2013 Texas-New Mexico Power Company [Member] Transmission Rate Filings [Member] | Mar. 31, 2014 Texas-New Mexico Power Company [Member] August 2013 Transmission Rate Filings [Member] | Mar. 31, 2014 Texas-New Mexico Power Company [Member] January 2014 Transmission Rate Filings [Member] | Mar. 31, 2014 Delta [Member] Public Service Company of New Mexico [Member] Applications for Approvals to Purchase Delta [Member] MW | Mar. 31, 2014 Clean Air Act, SNCR [Member] San Juan Generating Station Unit 4 [Member] Public Service Company of New Mexico [Member] MW | Dec. 20, 2013 Clean Air Act, SNCR [Member] San Juan Generating Station Unit 4 [Member] Public Service Company of New Mexico [Member] MW
Rate Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Required Percentage of Renewable Energy in Portfolio to Electric Sales |  |  |  |  |  |  |  | 10.00% | 15.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Required Percentage of Diversification |  |  |  | 30.00% | 20.00% | 5.00% | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Reasonable Cost Threshold |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Number of Mega Watts of Solar PV Capacity |  |  |  |  |  |  |  |  |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Number of Mega Watts of Wind Energy Capacity |  |  |  |  |  |  |  |  |  |  |  | 102 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, First Year Cost of Wind Capacity Planned Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  | $ 5,800,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Number of Mega Watt Hours of Wind Generation |  |  |  |  |  |  |  |  |  |  | 50,000 |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rider Rate For 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0045959 | 0.0044391 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Annual Revenue To be Collected Under Current Rider Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Estimated Cost of Mega Watts of Solar PV Capacity |  |  |  |  |  |  |  |  |  |  |  | 46,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Wind Capacity Planned Purchase Agreement Term |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Program Costs Related To Energy Efficiency |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program, Percentage of Program Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Profit Incentive Adder Revenues Related To Energy Efficiency Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership of EIP transmission line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Rider Condition of Earned Return on Jurisdictional Equity in 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Rate Rider to be Implemented |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0030468 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rider Rate For 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0028371 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Planning Period Covered of IRP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Number of Mega Watts Natural Gas Peaking Units to be Purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132 |  |
Public Utilities, Number of Mega Watts of Gas-fired Generation | 40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Installation Capital Costs | 63,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Rate Base Value | 56,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Additional Ownership To Be Obtained, in Megawatts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78 | 78
Public Utilities, Return on Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.81% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Collection of Deployment Costs Through Surcharge Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Completion Period of Advanced Meter Deployment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Non-standard metering service cost total to be borne by opt-out customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Public Utilities, Non-standard metering service cost initial fee range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142.84 | 247.48 |  |  |  |  |  |  |  |
Public Utilities, Non-standard metering ongoing expenses total to be borne by opt-out customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |
Public Utilities, Non-standard metering ongoing expenses monthly charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.99 |  |  |  |  |  |  |  |  |  |
Public Utilities, Additional Revenue from Proposed Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,900,000 | 18,100,000 | 18,200,000 |  |  |
Public Utilities, Total Revenue Requirement Increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 | 2,800,000 | 2,900,000 |  |  |
Public Utilities, Estimated Increase in Revenue over amendment term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Revenue For Power Sold Under Specific Contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Deployment Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,300,000 |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Program Implementation Costs, Bonus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,200,000 |  |  |  |  |  |  |
Public Utilities, Unapproved 2014 Program Implementation Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,600,000 |  |  |  |  |  |
Public Utilities, Retention Percentage of Sales Margins |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Under-collected balance write-off |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Frequency of IRP filings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Public Utilities, Rate Rider to be Implemented + References No definition available. + Details
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- Definition Reasonable Cost Threshold + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | num:percentItemType
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- Definition Regulated Operations, Required Percentage of Diversification + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Regulated Operations, Required Percentage of Renewable Energy in Portfolio to Electric Sales + References No definition available. + Details
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- Definition Public Utilities, Retention Percentage of Sales Margins + References No definition available. + Details
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- Definition Public Utilities, Return on Equity + References No definition available. + Details
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Namespace Prefix: | pnm_
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- Definition Public Utilities, Revenue For Power Sold Under Specific Contract + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Public Utilities, Rider Condition of Earned Return on Jurisdictional Equity in 2013 + References No definition available. + Details
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- Definition Public Utilities, Total Revenue Requirement Increase + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Public Utilities, Unapproved 2014 Program Implementation Costs + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Public Utilities, Under-collected balance write-off + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Public Utilities, Wind Capacity Planned Purchase Agreement Term + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Details
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Namespace Prefix: | pnm_
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Balance Type: | na
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- Definition Amount of regulatory costs not yet approved by the regulatory authority. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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