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v2.4.1.9

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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- Definition 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 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
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