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Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 1,423us-gaap_ValuationAllowancesAndReservesBalance | $ 1,751us-gaap_ValuationAllowancesAndReservesBalance | $ 1,778us-gaap_ValuationAllowancesAndReservesBalance
Charged to costs and expenses | 3,267us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 2,849us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 3,367us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Charged to other accounts | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
Write-offs and other | 3,224us-gaap_ValuationAllowancesAndReservesDeductions | 3,177us-gaap_ValuationAllowancesAndReservesDeductions | 3,394us-gaap_ValuationAllowancesAndReservesDeductions
Balance at end of year | 1,466us-gaap_ValuationAllowancesAndReservesBalance | 1,423us-gaap_ValuationAllowancesAndReservesBalance | 1,751us-gaap_ValuationAllowancesAndReservesBalance
Public Service Company of New Mexico [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 1,423us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,751us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,778us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Charged to costs and expenses | 3,275us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 2,864us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 3,384us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Charged to other accounts | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Write-offs and other | 3,232us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 3,192us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 3,411us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Balance at end of year | 1,466us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,423us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,751us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member] |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 0us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Charged to costs and expenses | (8)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | (15)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | (17)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Charged to other accounts | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Write-offs and other | (8)us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | (15)us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | (17)us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Balance at end of year | $ 0us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | $ 0us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | $ 0us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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