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Stockholders' Equity (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |
Preferred stock, cumulative shares authorized (in shares) | 10,000,000us-gaap_PreferredStockSharesAuthorized |  |
Texas-New Mexico Power Company [Member] |  |  |
Class of Stock [Line Items] |  |  |
Equity contribution from parent |  | $ 13,800,000us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |
Amount available for dividend distribution without prior approval from regulators or financial counterparties | 203,000,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |
Preferred stock, cumulative shares authorized (in shares) | 1,000,000us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |
Public Service Company of New Mexico [Member] |  |  |
Class of Stock [Line Items] |  |  |
Amount available for dividend distribution without prior approval from regulators or financial counterparties | 223,000,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Preferred stock, dividend rate (as a percent) | 4.58%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Preferred stock, redemption percent (as a percent) | 102.00%pnm_PreferredStockRedemptionPremiumPercent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Preferred Stock, Shares Outstanding | 115,293us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 115,293us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |
Preferred stock, cumulative shares authorized (in shares) | 10,000,000us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 10,000,000us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |
PNMR and TNMP [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Shares Outstanding | 0us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = pnm_PNMRandTNMPMember |  |
Affiliated Entity [Member] | Texas-New Mexico Power Company [Member] |  |  |
Class of Stock [Line Items] |  |  |
Cash dividends paid to parent company by consolidated subsidiaries | 16,300,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 3,700,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 26,000,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Affiliated Entity [Member] | Public Service Company of New Mexico [Member] |  |  |
Class of Stock [Line Items] |  |  |
Cash dividends paid to parent company by consolidated subsidiaries | $ 30,300,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | $ 155,000,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | $ 34,400,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Line of Credit [Member] | Texas-New Mexico Power Company [Member] |  |  |
Class of Stock [Line Items] |  |  |
Ratio of debt to capital, maximum (as a percent) | 65.00%pnm_RatioOfDebtToCapitalMaximum / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |

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