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Condensed Consolidated Statements of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Electric Operating Revenues	$ 332,868us-gaap_ElectricUtilityRevenue	$ 328,897us-gaap_ElectricUtilityRevenue
Operating Expenses:
Cost of energy	115,645us-gaap_CostOfGoodsSoldElectric	112,614us-gaap_CostOfGoodsSoldElectric
Administrative and general	43,859us-gaap_GeneralAndAdministrativeExpense	43,859us-gaap_GeneralAndAdministrativeExpense
Energy production costs	42,669us-gaap_ElectricProductionExpense	47,288us-gaap_ElectricProductionExpense
Regulatory disallowances	215pnm_RegulatoryDisallowance	0pnm_RegulatoryDisallowance
Depreciation and amortization	45,461us-gaap_CostOfServicesDepreciationAndAmortization	41,965us-gaap_CostOfServicesDepreciationAndAmortization
Transmission and distribution costs	16,487pnm_TransmissionAndDistributionCosts	16,906pnm_TransmissionAndDistributionCosts
Taxes other than income taxes	18,963us-gaap_UtilitiesOperatingExpenseTaxes	17,512us-gaap_UtilitiesOperatingExpenseTaxes
Total operating expenses	283,299us-gaap_UtilitiesOperatingExpense	280,144us-gaap_UtilitiesOperatingExpense
Operating income	49,569us-gaap_OperatingIncomeLoss	48,753us-gaap_OperatingIncomeLoss
Other Income and Deductions:
Interest income	1,750us-gaap_InvestmentIncomeInterest	2,117us-gaap_InvestmentIncomeInterest
Gains on available-for-sale securities	4,024us-gaap_GainLossOnInvestments	2,573us-gaap_GainLossOnInvestments
Other income	4,961us-gaap_OtherIncome	1,574us-gaap_OtherIncome
Other (deductions)	(3,662)us-gaap_OtherExpenses	(2,931)us-gaap_OtherExpenses
Net other income and deductions	7,073us-gaap_OtherNonoperatingIncomeExpense	3,333us-gaap_OtherNonoperatingIncomeExpense
Interest Charges	30,273us-gaap_InterestExpense	29,535us-gaap_InterestExpense
Earnings before Income Taxes	26,369us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	22,551us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income Taxes	8,517us-gaap_IncomeTaxExpenseBenefit	6,420us-gaap_IncomeTaxExpenseBenefit
Net Earnings	17,852us-gaap_ProfitLoss	16,131us-gaap_ProfitLoss
(Earnings) Attributable to Valencia Non-controlling Interest	(3,380)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(3,531)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Preferred Stock Dividend Requirements of Subsidiary	(132)us-gaap_DividendsPreferredStock	(132)us-gaap_DividendsPreferredStock
Net Earnings Attributable to PNMR	14,340us-gaap_NetIncomeLoss	12,468us-gaap_NetIncomeLoss
Net Earnings Available for PNM Common Stock	14,340us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	12,468us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net Earnings Attributable to PNMR per Common Share:
Basic (dollars per share)	$ 0.18us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.16us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted (dollars per share)	$ 0.18us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.16us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Dividends Declared per Common Share (dollars per share)	$ 0.200us-gaap_CommonStockDividendsPerShareDeclared	$ 0.185us-gaap_CommonStockDividendsPerShareDeclared
Public Service Company of New Mexico [Member]
Electric Operating Revenues	261,940us-gaap_ElectricUtilityRevenue / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	262,736us-gaap_ElectricUtilityRevenue / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Operating Expenses:
Cost of energy	97,866us-gaap_CostOfGoodsSoldElectric / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	96,626us-gaap_CostOfGoodsSoldElectric / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Administrative and general	39,567us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	38,609us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Energy production costs	42,669us-gaap_ElectricProductionExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	47,288us-gaap_ElectricProductionExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Regulatory disallowances	215pnm_RegulatoryDisallowance / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	0pnm_RegulatoryDisallowance / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Depreciation and amortization	28,403us-gaap_CostOfServicesDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	27,082us-gaap_CostOfServicesDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Transmission and distribution costs	10,769pnm_TransmissionAndDistributionCosts / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	11,327pnm_TransmissionAndDistributionCosts / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Taxes other than income taxes	10,796us-gaap_UtilitiesOperatingExpenseTaxes / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	10,500us-gaap_UtilitiesOperatingExpenseTaxes / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total operating expenses	230,285us-gaap_UtilitiesOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	231,432us-gaap_UtilitiesOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Operating income	31,655us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	31,304us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other Income and Deductions:
Interest income	1,771us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	2,128us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Gains on available-for-sale securities	4,024us-gaap_GainLossOnInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	2,573us-gaap_GainLossOnInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other income	3,392us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	1,113us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other (deductions)	(1,606)us-gaap_OtherExpenses / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(2,018)us-gaap_OtherExpenses / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Net other income and deductions	7,581us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	3,796us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Interest Charges	19,959us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	19,812us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Earnings before Income Taxes	19,277us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	15,288us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Income Taxes	5,775us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	4,083us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Net Earnings	13,502us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	11,205us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
(Earnings) Attributable to Valencia Non-controlling Interest	(3,380)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(3,531)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Preferred Stock Dividend Requirements of Subsidiary	(132)us-gaap_DividendsPreferredStock / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	(132)us-gaap_DividendsPreferredStock / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Net Earnings Attributable to PNMR	10,122us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	7,674us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Net Earnings Available for PNM Common Stock	9,990us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember	7,542us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member]
Electric Operating Revenues	70,928us-gaap_ElectricUtilityRevenue / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	66,161us-gaap_ElectricUtilityRevenue / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Operating Expenses:
Cost of energy	17,779us-gaap_CostOfGoodsSoldElectric / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	15,988us-gaap_CostOfGoodsSoldElectric / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Administrative and general	9,833us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	9,840us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Depreciation and amortization	13,458us-gaap_CostOfServicesDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	11,842us-gaap_CostOfServicesDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Transmission and distribution costs	5,718pnm_TransmissionAndDistributionCosts / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	5,579pnm_TransmissionAndDistributionCosts / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Taxes other than income taxes	6,209us-gaap_UtilitiesOperatingExpenseTaxes / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	5,650us-gaap_UtilitiesOperatingExpenseTaxes / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total operating expenses	52,997us-gaap_UtilitiesOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	48,899us-gaap_UtilitiesOperatingExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Operating income	17,931us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	17,262us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Other Income and Deductions:
Interest income	0us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	0us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Other income	1,540us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	420us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Other (deductions)	(249)us-gaap_OtherExpenses / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	(231)us-gaap_OtherExpenses / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Net other income and deductions	1,291us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	189us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Interest Charges	6,925us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	6,598us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Earnings before Income Taxes	12,297us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	10,853us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Income Taxes	4,603us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	4,050us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Net Earnings	7,694us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	6,803us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
(Earnings) Attributable to Valencia Non-controlling Interest	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Preferred Stock Dividend Requirements of Subsidiary	0us-gaap_DividendsPreferredStock / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	0us-gaap_DividendsPreferredStock / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Net Earnings Attributable to PNMR	7,694us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	6,803us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Net Earnings Available for PNM Common Stock	$ 7,694us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 6,803us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember

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