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Lease Commitments Schedule of Future Minimum Rental Payments for Operating Leases (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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PNMR [Member] |
Lease commitments |
2015 | $ 36,350us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / dei_LegalEntityAxis = pnm_PnmrMember
2016 | 28,892us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / dei_LegalEntityAxis = pnm_PnmrMember
2017 | 25,185us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / dei_LegalEntityAxis = pnm_PnmrMember
2018 | 25,194us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / dei_LegalEntityAxis = pnm_PnmrMember
2019 | 25,203us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / dei_LegalEntityAxis = pnm_PnmrMember
Later years | 134,068us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / dei_LegalEntityAxis = pnm_PnmrMember
Total minimum lease payments | 274,892us-gaap_OperatingLeasesFutureMinimumPaymentsDue / dei_LegalEntityAxis = pnm_PnmrMember
Public Service Company of New Mexico [Member] |
Lease commitments |
2015 | 33,144us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
2016 | 27,986us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
2017 | 24,907us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
2018 | 24,907us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
2019 | 24,907us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Later years | 133,842us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total minimum lease payments | 269,693us-gaap_OperatingLeasesFutureMinimumPaymentsDue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member] |
Lease commitments |
2015 | 1,186us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
2016 | 636us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
2017 | 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
2018 | 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
2019 | 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Later years | 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Total minimum lease payments | 1,822us-gaap_OperatingLeasesFutureMinimumPaymentsDue / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] | Public Service Company of New Mexico [Member] |
Lease commitments |
2015 | 24,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
2016 | $ 9,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / us-gaap_LeaseArrangementTypeAxis = pnm_PaloVerdeNuclearGeneratingStationUnit2LeasesMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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