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Financing - Short-term Debt (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Apr. 24, 2015	Jan. 08, 2014
Short-term Debt [Line Items]
Short-term debt	$ 100,000,000us-gaap_ShortTermBorrowings	$ 105,600,000us-gaap_ShortTermBorrowings
Subsequent Event [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			814,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
PNMR Term Loan Agreement [Member]
Short-term Debt [Line Items]
Short-term debt	100,000,000us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = pnm_PnmrTermLoanAgreementMember	100,000,000us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = pnm_PnmrTermLoanAgreementMember
Short-term Debt, Weighted Average Interest Rate	1.03%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = pnm_PnmrTermLoanAgreementMember
PNM Resources [Member] | Subsequent Event [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			292,300,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Restricted Cash and Investments			87,400,000us-gaap_RestrictedCashAndInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Public Service Company of New Mexico [Member] | Subsequent Event [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			396,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Restricted Cash and Investments			0us-gaap_RestrictedCashAndInvestments / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Public Service Company of New Mexico [Member] | Subsequent Event [Member] | Affiliated Entity [Member]
Short-term Debt [Line Items]
Short-term debt – affiliate			26,400,000pnm_ShortTermDebtDueToRelatedParty / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Public Service Company of New Mexico [Member] | PNM 2014 Multi-Draw Term Loan Agreement [Member] | Subsequent Event [Member]
Short-term Debt [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount			25,000,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_PNM2014MultiDrawTermLoanAgreementMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Public Service Company of New Mexico [Member] | Local Lines of Credit [Member]
Short-term Debt [Line Items]
Debt Instruments, NMPRC Approved credit facility				50,000,000pnm_DebtInstrumentsNMPRCApprovedcreditfaciltiy / us-gaap_DebtInstrumentAxis = pnm_LocalLinesOfCreditMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Short-term debt	0us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = pnm_LocalLinesOfCreditMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	0us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = pnm_LocalLinesOfCreditMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Public Service Company of New Mexico [Member] | Local Lines of Credit [Member] | Subsequent Event [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			50,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = pnm_LocalLinesOfCreditMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Texas-New Mexico Power Company [Member] | Subsequent Event [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			74,900,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Restricted Cash and Investments			0us-gaap_RestrictedCashAndInvestments / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Texas-New Mexico Power Company [Member] | Subsequent Event [Member] | Affiliated Entity [Member]
Short-term Debt [Line Items]
Short-term debt – affiliate			38,400,000pnm_ShortTermDebtDueToRelatedParty / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Texas-New Mexico Power Company [Member] | Intercompany loan agreements [Member]
Short-term Debt [Line Items]
Short-term debt - affiliate	28,500,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent / us-gaap_DebtInstrumentAxis = pnm_IntercompanyLoanAgreementsMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Line of Credit [Member]
Short-term Debt [Line Items]
Short-term debt	100,000,000us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember	105,600,000us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Short-term debt	0us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Revolving Credit Facility [Member] | PNM Resources [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Short-term debt	0us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	600,000us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Revolving Credit Facility [Member] | Public Service Company of New Mexico [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Short-term debt	0us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	0us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Revolving Credit Facility [Member] | Texas-New Mexico Power Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Short-term debt	0us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember	5,000,000us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Revolving Credit Facility [Member] | Texas-New Mexico Power Company [Member] | First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member]
Short-term Debt [Line Items]
Debt Instrument, Collateral Amount	$ 75,000,000us-gaap_DebtInstrumentCollateralAmount / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2014Series2009AAt9Point50PercentMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember

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Short Term Debt Due to Related Party

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Amount of assets pledged to secure a debt instrument.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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