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Significant Accounting Policies and Responsibility for Financial Statements - Narrative (Details) (Adjustments for New Accounting Pronouncement [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unamortized Debt Issuance Expense	$ 17.7us-gaap_UnamortizedDebtIssuanceExpense
Public Service Company of New Mexico [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unamortized Debt Issuance Expense	10.7us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = us-gaap_NewAccountingPronouncementMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unamortized Debt Issuance Expense	$ 5.4us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = us-gaap_NewAccountingPronouncementMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ 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 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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