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Lease Commitments Schedule of Rent Expense (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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 + Details
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