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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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

X

- 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

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X

- Details

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X

- Details

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Period Type: