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v2.4.1.9

Financing - Short-term Debt (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014 | Apr. 24, 2015 | Jan. 08, 2014
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Short-term Debt [Line Items] |  |  |  |
Short-term debt | $ 100,000,000 us-gaap_ShortTermBorrowings | $ 105,600,000 us-gaap_ShortTermBorrowings |  |
Subsequent Event [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 814,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
PNMR Term Loan Agreement [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term debt | 100,000,000 us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = pnm_PnmrTermLoanAgreementMember | 100,000,000 us-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 |  |  | 292,300,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Restricted Cash and Investments |  |  | 87,400,000 us-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 |  |  | 396,800,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Restricted Cash and Investments |  |  | 0 us-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 |  |  | 26,400,000 pnm_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 |  |  | 25,000,000 us-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 |  |  |  | 50,000,000 pnm_DebtInstrumentsNMPRCApprovedcreditfaciltiy / us-gaap_DebtInstrumentAxis = pnm_LocalLinesOfCreditMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Short-term debt | 0 us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = pnm_LocalLinesOfCreditMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 0 us-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 |  |  | 50,000,000 us-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 |  |  | 74,900,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Restricted Cash and Investments |  |  | 0 us-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 |  |  | 38,400,000 pnm_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 | 28,500,000 us-gaap_NotesPayableRelatedPartiesClassifiedCurrent / us-gaap_DebtInstrumentAxis = pnm_IntercompanyLoanAgreementsMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |  |
Line of Credit [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term debt | 100,000,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember | 105,600,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Revolving Credit Facility [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term debt | 0 us-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 | 300,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Short-term debt | 0 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 600,000 us-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 | 400,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Short-term debt | 0 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 0 us-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 | 75,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Short-term debt | 0 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 5,000,000 us-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 | $ 75,000,000 us-gaap_DebtInstrumentCollateralAmount / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2014Series2009AAt9Point50PercentMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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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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- Definition 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. + 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 210.5-02.19(b),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 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),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 19, 22 -Article 5 + Details
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