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Income Taxes Summary of Income Tax Contingencies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits - Beginning | $ 19,889,000us-gaap_UnrecognizedTaxBenefits | $ 19,198,000us-gaap_UnrecognizedTaxBenefits | $ 19,580,000us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions | 623,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | (54,000)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 2,046,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions (reductions) for tax positions of prior years | (5,481,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions |  | (2,428,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Additions for tax positions of prior years |  | 745,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
Settlement payments | 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Unrecognized Tax Benefits - End | 15,031,000us-gaap_UnrecognizedTaxBenefits | 19,889,000us-gaap_UnrecognizedTaxBenefits | 19,198,000us-gaap_UnrecognizedTaxBenefits
Public Service Company of New Mexico [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits - Beginning | 11,073,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 10,382,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 10,752,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Additions based on tax positions | 623,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | (54,000)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,152,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Additions (reductions) for tax positions of prior years |  |  | (1,522,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Additions for tax positions of prior years | 532,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 745,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |
Settlement payments | 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Unrecognized Tax Benefits - End | 12,228,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 11,073,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 10,382,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Unrecognized tax benefits that would impact effective tax rate | 1,900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Texas-New Mexico Power Company [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits - Beginning | 6,796,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 6,796,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 7,701,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Additions based on tax positions | 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Additions (reductions) for tax positions of prior years | (6,796,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  | (905,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Additions for tax positions of prior years |  | 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |
Settlement payments | 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Unrecognized Tax Benefits - End | 0us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 6,796,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 6,796,000us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
PNMR [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 4,700,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate / dei_LegalEntityAxis = pnm_PnmrMember |  |

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