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Income Taxes Accumulated Accrued Interest Receivable (Payable) Related to Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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PNMR [Member] |  |
Income Taxes [Line Items] |  |
Accumulated accrued interest receivable | $ 3,569pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestReceivable / dei_LegalEntityAxis = pnm_PnmrMember | $ 4,048pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestReceivable / dei_LegalEntityAxis = pnm_PnmrMember
Accumulated accrued interest payable | (1,120)pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestPayable / dei_LegalEntityAxis = pnm_PnmrMember | (1,118)pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestPayable / dei_LegalEntityAxis = pnm_PnmrMember
Public Service Company of New Mexico [Member] |  |
Income Taxes [Line Items] |  |
Accumulated accrued interest receivable | 3,569pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestReceivable / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 4,048pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestReceivable / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Accumulated accrued interest payable | (24)pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestPayable / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | (24)pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestPayable / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member] |  |
Income Taxes [Line Items] |  |
Accumulated accrued interest receivable | 0pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestReceivable / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestReceivable / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Accumulated accrued interest payable | $ (120)pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestPayable / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | $ (118)pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestPayable / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

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

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- Definition Unrecognized Tax Benefit, Accumulated Accrued Interest Payable + References No definition available. + Details
Name: | pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestPayable
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unrecognized Tax Benefit, Accumulated Accrued Interest Receivable + References No definition available. + Details
Name: | pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestReceivable
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=pnm_PnmrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=pnm_PublicServiceCompanyOfNewMexicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=pnm_TexasNewMexicoPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |