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Lease Commitments Schedule of Rent Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PNMR [Member]
Operating lease expense [Line Items]
Operating Leases, Rent Expense, Net	$ 82,756us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_PnmrMember	$ 82,882us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_PnmrMember	$ 84,794us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_PnmrMember
Public Service Company of New Mexico [Member]
Operating lease expense [Line Items]
Operating Leases, Rent Expense, Net	76,745us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	78,306us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	78,483us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member]
Operating lease expense [Line Items]
Operating Leases, Rent Expense, Net	$ 3,932us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 2,663us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 2,871us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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