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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Allowance for uncollectible accounts | $ 1,466us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 1,423us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated depreciation, nuclear fuel | 44,507pnm_AccumulatedAmortizationNuclearFuel | 47,347pnm_AccumulatedAmortizationNuclearFuel
Cumulative preferred stock of subsidiary, stated value | $ 100pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsParOrStatedValuePerShare | $ 100pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsParOrStatedValuePerShare
Cumulative preferred stock of subsidiary, shares authorized | 10,000,000pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesAuthorized | 10,000,000pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesAuthorized
Cumulative preferred stock of subsidiary, shares issued | 115,293pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesIssued | 115,293pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesIssued
Cumulative preferred stock of subsidiary, shares outstanding | 115,293pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesOutstanding | 115,293pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesOutstanding
Common stock, par value | $ 0us-gaap_CommonStockNoParValue | $ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized | 120,000,000us-gaap_CommonStockSharesAuthorized | 120,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued | 79,653,624us-gaap_CommonStockSharesIssued | 79,653,624us-gaap_CommonStockSharesIssued
Common stock, shares outstanding | 79,653,624us-gaap_CommonStockSharesOutstanding | 79,653,624us-gaap_CommonStockSharesOutstanding
Cumulative preferred stock of subsidiary, shares authorized | 10,000,000us-gaap_PreferredStockSharesAuthorized |
Public Service Company of New Mexico [Member] |  |
Allowance for uncollectible accounts | 1,466us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,423us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Accumulated depreciation, nuclear fuel | $ 44,507pnm_AccumulatedAmortizationNuclearFuel / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | $ 47,347pnm_AccumulatedAmortizationNuclearFuel / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Common stock, par value | $ 0us-gaap_CommonStockNoParValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | $ 0us-gaap_CommonStockNoParValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Common stock, shares authorized | 40,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 40,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Common stock, shares issued | 39,117,799us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 39,117,799us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Common stock, shares outstanding | 39,117,799us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 39,117,799us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Cumulative preferred stock of subsidiary, stated value | $ 100us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | $ 100us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Cumulative preferred stock of subsidiary, shares authorized | 10,000,000us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 10,000,000us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Cumulative preferred stock of subsidiary, shares issued | 115,293us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 115,293us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Cumulative preferred stock of subsidiary, shares outstanding | 115,293us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 115,293us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member] |  |
Common stock, shares authorized | 12,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 12,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Common stock, shares issued | 6,358us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 6,358us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Common stock, shares outstanding | 6,358us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 6,358us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Common stock, par value | $ 10us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | $ 10us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Cumulative preferred stock of subsidiary, shares authorized | 1,000,000us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |

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