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Financing Short-term Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 20, 2015	Apr. 30, 2009
Short-term Debt [Line Items]
Line of Credit Facility, Extension Option, Years	1 year
Debt, Weighted Average Interest Rate	6.60%us-gaap_DebtWeightedAverageInterestRate	6.90%us-gaap_DebtWeightedAverageInterestRate	6.60%us-gaap_DebtWeightedAverageInterestRate
Short-term debt	$ 105,600,000us-gaap_ShortTermBorrowings	$ 149,200,000us-gaap_ShortTermBorrowings
Letters of Credit Outstanding, Amount	7,700,000us-gaap_LettersOfCreditOutstandingAmount
Public Service Company of New Mexico [Member]
Short-term Debt [Line Items]
Letters of Credit Outstanding, Amount	3,200,000us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Public Service Company of New Mexico [Member] | PNM 2014 Multi-Draw Term Loan Agreement [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
Texas-New Mexico Power Company [Member]
Short-term Debt [Line Items]
Letters of Credit Outstanding, Amount	100,000us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
New Mexico Revolving Credit Facility [Member] | Public Service Company of New Mexico [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = pnm_NewMexicoRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
PNMR Term Loan Agreement [Member]
Short-term Debt [Line Items]
Debt, Weighted Average Interest Rate	1.02%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = pnm_PnmrTermLoanAgreementMember
Short-term debt	100,000,000us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = pnm_PnmrTermLoanAgreementMember	100,000,000us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = pnm_PnmrTermLoanAgreementMember
Subsequent Event [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity				291,500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Invested Cash and Cash Equivalents				1,900,000pnm_InvestedCashAndCashEquivalents / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Public Service Company of New Mexico [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity				386,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Invested Cash and Cash Equivalents				42,500,000pnm_InvestedCashAndCashEquivalents / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Public Service Company of New Mexico [Member] | PNM 2014 Multi-Draw Term Loan Agreement [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
Subsequent Event [Member] | Texas-New Mexico Power Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity				54,900,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Invested Cash and Cash Equivalents				0pnm_InvestedCashAndCashEquivalents / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Available Borrowing Capacity [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity				768,200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_SubsequentEventTypeAxis = pnm_AvailableBorrowingCapacityMember
PNMR Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = pnm_PNMRRevolvingCreditFacilityMember
Debt, Weighted Average Interest Rate	1.67%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = pnm_PNMRRevolvingCreditFacilityMember
Short-term debt	600,000us-gaap_ShortTermBorrowings / us-gaap_CreditFacilityAxis = pnm_PNMRRevolvingCreditFacilityMember	0us-gaap_ShortTermBorrowings / us-gaap_CreditFacilityAxis = pnm_PNMRRevolvingCreditFacilityMember
PNM Revolving Credit Facility [Member] | Public Service Company of New Mexico [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = pnm_PNMRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Short-term debt	0us-gaap_ShortTermBorrowings / us-gaap_CreditFacilityAxis = pnm_PNMRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	49,200,000us-gaap_ShortTermBorrowings / us-gaap_CreditFacilityAxis = pnm_PNMRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
TNMP Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Debt, Weighted Average Interest Rate	1.17%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = pnm_TNMPRevolvingCreditFacilityMember
TNMP Revolving Credit Facility [Member] | Texas-New Mexico Power Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = pnm_TNMPRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Short-term debt	5,000,000us-gaap_ShortTermBorrowings / us-gaap_CreditFacilityAxis = pnm_TNMPRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	0us-gaap_ShortTermBorrowings / us-gaap_CreditFacilityAxis = pnm_TNMPRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
TNMP Revolving Credit Facility [Member] | First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] | Texas-New Mexico Power Company [Member]
Short-term Debt [Line Items]
Securities Received as Collateral					75,000,000us-gaap_SecuritiesReceivedAsCollateral / us-gaap_CreditFacilityAxis = pnm_TNMPRevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2014Series2009AAt9Point50PercentMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Ratio of debt to capital, maximum (as a percent)	65.00%pnm_RatioOfDebtToCapitalMaximum / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
New Mexico Revolving Credit Facility [Member] | Public Service Company of New Mexico [Member]
Short-term Debt [Line Items]
Short-term debt	0us-gaap_ShortTermBorrowings / us-gaap_CreditFacilityAxis = pnm_NewMexicoRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	0us-gaap_ShortTermBorrowings / us-gaap_CreditFacilityAxis = pnm_NewMexicoRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
New Mexico Revolving Credit Facility [Member] | Subsequent Event [Member] | Public Service Company of New Mexico [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity				$ 35,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = pnm_NewMexicoRevolvingCreditFacilityMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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Line of Credit Facility, Extension Option, Years

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Ratio of debt to capital, maximum

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

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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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