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Regulatory and Rate Matters - Electric Rate Case (Details) (2014 Electric Rate Case [Member], Public Service Company of New Mexico [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
2014 Electric Rate Case [Member] | Public Service Company of New Mexico [Member] |
Public Utilities, General Disclosures [Line Items] |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 107.4 us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_A2014ElectricRateCaseMember
Public Utilities, Requested Return on Equity, Percentage | 10.50%us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_A2014ElectricRateCaseMember
Public Utilities, Average customer bill increase percentage | 7.69%pnm_PublicUtilitiesAveragecustomerbillincreasepercentage / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_A2014ElectricRateCaseMember
Public Utilities, Percentage of requested rate increase pertaining to infrastructure investments | 92.00%pnm_PublicUtilitiesPercentageofrequestedrateincreasepertainingtoinfrastructureinvestments / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_A2014ElectricRateCaseMember
Proposed period of delay | 60 days

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- Definition Public Utilities, Average customer bill increase percentage + References No definition available. + Details
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- Definition Public Utilities, Percentage of requested rate increase pertaining to infrastructure investments + References No definition available. + Details
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- Details
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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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- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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