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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Service billings [Member] | PNMR to PNM [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | $ 86,871us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToPnmMember | $ 92,597us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToPnmMember | $ 99,986us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToPnmMember
Service billings [Member] | PNMR to TNMP [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 28,349us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToTnmpMember | 28,937us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToTnmpMember | 29,110us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToTnmpMember
Service billings [Member] | PNM to TNMP [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 524us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmToTnmpMember | 562us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmToTnmpMember | 595us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmToTnmpMember
Service billings [Member] | TNMP to PNMR [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 31us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_TnmpToPnmrMember | 7us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_TnmpToPnmrMember | 15us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_ServiceBillingsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_TnmpToPnmrMember
Income tax sharing payments [Member] | PNMR to PNM [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 0us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_IncomeTaxSharingPaymentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToPnmMember | 77,433us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_IncomeTaxSharingPaymentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToPnmMember | 63,114us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_IncomeTaxSharingPaymentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToPnmMember
Income tax sharing payments [Member] | PNMR to TNMP [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 0us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_IncomeTaxSharingPaymentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToTnmpMember | 0us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_IncomeTaxSharingPaymentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToTnmpMember | 1,951us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_IncomeTaxSharingPaymentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmrToTnmpMember
Income tax sharing payments [Member] | TNMP to PNMR [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 0us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_IncomeTaxSharingPaymentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_TnmpToPnmrMember | 3,643us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_IncomeTaxSharingPaymentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_TnmpToPnmrMember | 0us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_IncomeTaxSharingPaymentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_TnmpToPnmrMember
Interest charges [Member] | TNMP to PNMR [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | 309us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_InterestChargesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_TnmpToPnmrMember | 481us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_InterestChargesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_TnmpToPnmrMember | 137us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_InterestChargesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_TnmpToPnmrMember
Interest charges [Member] | PNM to PNMR [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of related party transaction | $ 65us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_InterestChargesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmToPnmrMember | $ 4us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_InterestChargesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmToPnmrMember | $ 1us-gaap_RelatedPartyTransactionAmountsOfTransaction / pnm_RelatedPartyTransactionByTransactionTypeAxis = pnm_InterestChargesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnm_PnmToPnmrMember

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | pnm_RelatedPartyTransactionByTransactionTypeAxis=pnm_IncomeTaxSharingPaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pnm_RelatedPartyTransactionByTransactionTypeAxis=pnm_InterestChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pnm_RelatedPartyTransactionByTransactionTypeAxis=pnm_ServiceBillingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |