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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
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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- Definition

Unrecognized Tax Benefit, Accumulated Accrued Interest Payable

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- Definition

Unrecognized Tax Benefit, Accumulated Accrued Interest Receivable

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No definition available.

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- Details

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