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Financing - Financing Activities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 09, 2015	Mar. 05, 2014	Apr. 22, 2013
Debt Instrument [Line Items]
Short-term debt	$ 100,000,000us-gaap_ShortTermBorrowings	$ 105,600,000us-gaap_ShortTermBorrowings
PNMR 2015 Term Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt			150,000,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pnm_PNMR2015TermLoanAgreementMember
Debt Instrument, Interest Rate at Period End	1.18%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = pnm_PNMR2015TermLoanAgreementMember
Public Service Company of New Mexico [Member] | PNM 2014 Term Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt				175,000,000us-gaap_LongTermDebt / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_PNM2014TermLoanAgreementMember
Debt Instrument, Interest Rate at Period End	1.13%us-gaap_DebtInstrumentInterestRateEffectivePercentage / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_PNM2014TermLoanAgreementMember
PNM Term Loan Agreement [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Short-term debt					$ 75,000,000us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = pnm_PnmTermLoanAgreementMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_NotesPayableToBanksMember

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-Publisher SEC

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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