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Quarterly Operating Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, 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
Segment Reporting Information [Line Items]
Operating revenues	$ 346,845us-gaap_ElectricUtilityRevenue	$ 413,951us-gaap_ElectricUtilityRevenue	$ 346,160us-gaap_ElectricUtilityRevenue	$ 328,897us-gaap_ElectricUtilityRevenue	$ 322,929us-gaap_ElectricUtilityRevenue	$ 399,730us-gaap_ElectricUtilityRevenue	$ 347,599us-gaap_ElectricUtilityRevenue	$ 317,665us-gaap_ElectricUtilityRevenue	$ 1,435,853us-gaap_ElectricUtilityRevenue	$ 1,387,923us-gaap_ElectricUtilityRevenue	$ 1,342,403us-gaap_ElectricUtilityRevenue
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
Net earnings	22,111us-gaap_ProfitLoss	59,486us-gaap_ProfitLoss	33,181us-gaap_ProfitLoss	16,131us-gaap_ProfitLoss	11,397us-gaap_ProfitLoss	58,814us-gaap_ProfitLoss	31,383us-gaap_ProfitLoss	13,962us-gaap_ProfitLoss	130,909us-gaap_ProfitLoss	115,556us-gaap_ProfitLoss	120,125us-gaap_ProfitLoss
Earnings Attributable to PNMR	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
Net Earnings Attributable to PNMR per Common Share:
Basic (dollars per share)	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.70us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.68us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic	$ 1.46us-gaap_EarningsPerShareBasic	$ 1.26us-gaap_EarningsPerShareBasic	$ 1.32us-gaap_EarningsPerShareBasic
Diluted (dollars per share)	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.68us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.13us-gaap_EarningsPerShareDiluted	$ 1.45us-gaap_EarningsPerShareDiluted	$ 1.25us-gaap_EarningsPerShareDiluted	$ 1.31us-gaap_EarningsPerShareDiluted
Public Service Company of New Mexico [Member]
Segment Reporting Information [Line Items]
Operating revenues	274,481us-gaap_ElectricUtilityRevenue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	334,993us-gaap_ElectricUtilityRevenue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	275,704us-gaap_ElectricUtilityRevenue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	262,736us-gaap_ElectricUtilityRevenue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	252,702us-gaap_ElectricUtilityRevenue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	326,026us-gaap_ElectricUtilityRevenue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	279,690us-gaap_ElectricUtilityRevenue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	257,894us-gaap_ElectricUtilityRevenue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Operating income	40,988us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	90,615us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	49,806us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	31,304us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	18,427us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	95,217us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	58,302us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	37,239us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Net earnings	16,942us-gaap_ProfitLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	49,052us-gaap_ProfitLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	24,254us-gaap_ProfitLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	11,205us-gaap_ProfitLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	6,256us-gaap_ProfitLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	51,950us-gaap_ProfitLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	29,697us-gaap_ProfitLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	14,773us-gaap_ProfitLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Earnings Attributable to PNMR	13,955us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	45,351us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	20,346us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	7,674us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	2,639us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	47,823us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	26,124us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	11,569us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member]
Segment Reporting Information [Line Items]
Operating income	21,188us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	25,873us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	21,265us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	17,262us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	17,210us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	22,254us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	19,667us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	13,054us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Earnings Attributable to PNMR	9,115us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	12,355us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	9,534us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	6,803us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	6,919us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	10,106us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	8,339us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	3,726us-gaap_NetIncomeLoss / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Electric Domestic Regulated Revenue	$ 72,364us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 78,958us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 70,456us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 66,161us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 70,227us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 73,704us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 67,909us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 59,771us-gaap_ElectricDomesticRegulatedRevenue / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

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