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Sale of First Choice (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of First Choice	$ 0pnm_GainOnSaleOfBusinessSegment	$ 0pnm_GainOnSaleOfBusinessSegment	$ 1,012pnm_GainOnSaleOfBusinessSegment
Other Income [Member] | First Choice [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of First Choice			$ 1,000pnm_GainOnSaleOfBusinessSegment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pnm_FirstChoiceMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember

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Gain on Sale of Business Segment

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