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Schedule I - Condensed Financial Information of Parent Company (Statements of Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Operating Expenses									$ 1,136,156us-gaap_UtilitiesOperatingExpense	$ 1,101,081us-gaap_UtilitiesOperatingExpense	$ 1,068,682us-gaap_UtilitiesOperatingExpense
Operating income	62,849us-gaap_OperatingIncomeLoss	116,799us-gaap_OperatingIncomeLoss	71,296us-gaap_OperatingIncomeLoss	48,753us-gaap_OperatingIncomeLoss	40,532us-gaap_OperatingIncomeLoss	117,739us-gaap_OperatingIncomeLoss	77,867us-gaap_OperatingIncomeLoss	50,704us-gaap_OperatingIncomeLoss	299,697us-gaap_OperatingIncomeLoss	286,842us-gaap_OperatingIncomeLoss	273,721us-gaap_OperatingIncomeLoss
Other Income and Deductions:
Other income									12,048us-gaap_OtherIncome	10,572us-gaap_OtherIncome	12,746us-gaap_OtherIncome
Other (deductions)									(10,481)us-gaap_OtherExpenses	(21,552)us-gaap_OtherExpenses	(17,636)us-gaap_OtherExpenses
Net other income and deductions									20,577us-gaap_OtherNonoperatingIncomeExpense	9,675us-gaap_OtherNonoperatingIncomeExpense	22,159us-gaap_OtherNonoperatingIncomeExpense
Earnings before Income Taxes									200,647us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	175,069us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	175,035us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income Taxes									69,738us-gaap_IncomeTaxExpenseBenefit	59,513us-gaap_IncomeTaxExpenseBenefit	54,910us-gaap_IncomeTaxExpenseBenefit
Net Earnings Attributable to Company	18,992us-gaap_NetIncomeLoss	55,653us-gaap_NetIncomeLoss	29,141us-gaap_NetIncomeLoss	12,468us-gaap_NetIncomeLoss	7,648us-gaap_NetIncomeLoss	54,555us-gaap_NetIncomeLoss	27,678us-gaap_NetIncomeLoss	10,626us-gaap_NetIncomeLoss	116,254us-gaap_NetIncomeLoss	100,507us-gaap_NetIncomeLoss	105,547us-gaap_NetIncomeLoss
PNM Resources [Member]
Condensed Financial Statements, Captions [Line Items]
Non-affiliates									0us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Expenses									650us-gaap_UtilitiesOperatingExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	941us-gaap_UtilitiesOperatingExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	3,287us-gaap_UtilitiesOperatingExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income									(650)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(941)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(3,287)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Income and Deductions:
Equity in earnings of subsidiaries									124,543pnm_IncomeLossFromEquityMethodInvestmentExcludingJointVenture / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	116,634pnm_IncomeLossFromEquityMethodInvestmentExcludingJointVenture / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	117,900pnm_IncomeLossFromEquityMethodInvestmentExcludingJointVenture / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income									622us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	769us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	670us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other (deductions)									(13,650)us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(22,825)us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(20,904)us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net other income and deductions									111,515us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	94,578us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	97,666us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Earnings before Income Taxes									110,865us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	93,637us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	94,379us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Taxes									(5,389)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(6,870)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(11,168)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Earnings Attributable to Company									$ 116,254us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 100,507us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 105,547us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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