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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Allowance for uncollectible accounts | $ 1,466 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 1,466 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated depreciation, nuclear fuel | 51,203 pnm_AccumulatedAmortizationNuclearFuel | 44,507 pnm_AccumulatedAmortizationNuclearFuel
Cumulative preferred stock of subsidiary, stated value | $ 100 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsParOrStatedValuePerShare | $ 100 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsParOrStatedValuePerShare
Cumulative preferred stock of subsidiary, shares authorized | 10,000,000 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesAuthorized | 10,000,000 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesAuthorized
Cumulative preferred stock of subsidiary, shares issued | 115,293 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesIssued | 115,293 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesIssued
Cumulative preferred stock of subsidiary, shares authorized | 115,293 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesOutstanding | 115,293 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirementsSharesOutstanding
Common stock, par value | $ 0 us-gaap_CommonStockNoParValue | $ 0 us-gaap_CommonStockNoParValue
Common stock, shares authorized | 120,000,000 us-gaap_CommonStockSharesAuthorized | 120,000,000 us-gaap_CommonStockSharesAuthorized
Common stock, shares issued | 79,653,624 us-gaap_CommonStockSharesIssued | 79,653,624 us-gaap_CommonStockSharesIssued
Common stock, shares outstanding | 79,653,624 us-gaap_CommonStockSharesOutstanding | 79,653,624 us-gaap_CommonStockSharesOutstanding
Public Service Company of New Mexico [Member] |  |
Allowance for uncollectible accounts | 1,466 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,466 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Accumulated depreciation, nuclear fuel | $ 51,203 pnm_AccumulatedAmortizationNuclearFuel / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | $ 44,507 pnm_AccumulatedAmortizationNuclearFuel / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Cumulative preferred stock, stated value | $ 100 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | $ 100 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Cumulative preferred stock, shares authorized | 10,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 10,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Cumulative preferred stock, shares issued | 115,293 us-gaap_PreferredStockSharesIssued / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 115,293 us-gaap_PreferredStockSharesIssued / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Cumulative preferred stock, shares outstanding | 115,293 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 115,293 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Common stock, par value | $ 0 us-gaap_CommonStockNoParValue / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | $ 0 us-gaap_CommonStockNoParValue / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Common stock, shares authorized | 40,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 40,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Common stock, shares issued | 39,117,799 us-gaap_CommonStockSharesIssued / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 39,117,799 us-gaap_CommonStockSharesIssued / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Common stock, shares outstanding | 39,117,799 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 39,117,799 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member] |  |
Common stock, par value | $ 10 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | $ 10 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Common stock, shares authorized | 12,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 12,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Common stock, shares issued | 6,358 us-gaap_CommonStockSharesIssued / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 6,358 us-gaap_CommonStockSharesIssued / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Common stock, shares outstanding | 6,358 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 6,358 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember

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