Consolidated Statements of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Electric Operating Revenues	$ 1,435,853us-gaap_ElectricUtilityRevenue	$ 1,387,923us-gaap_ElectricUtilityRevenue	$ 1,342,403us-gaap_ElectricUtilityRevenue
Operating Expenses:
Cost of energy	471,556us-gaap_CostOfGoodsSoldElectric	432,316us-gaap_CostOfGoodsSoldElectric	399,850us-gaap_CostOfGoodsSoldElectric
Administrative and general	171,111us-gaap_GeneralAndAdministrativeExpense	179,210us-gaap_GeneralAndAdministrativeExpense	187,740us-gaap_GeneralAndAdministrativeExpense
Energy production costs	185,638us-gaap_ElectricProductionExpense	175,819us-gaap_ElectricProductionExpense	185,417us-gaap_ElectricProductionExpense
Regulatory disallowances	1,062pnm_RegulatoryDisallowance	12,235pnm_RegulatoryDisallowance	0pnm_RegulatoryDisallowance
Depreciation and amortization	172,634	166,881	164,173
Transmission and distribution costs	66,571pnm_TransmissionAndDistributionCosts	70,124pnm_TransmissionAndDistributionCosts	71,125pnm_TransmissionAndDistributionCosts
Taxes other than income taxes	67,584us-gaap_UtilitiesOperatingExpenseTaxes	64,496us-gaap_UtilitiesOperatingExpenseTaxes	60,377us-gaap_UtilitiesOperatingExpenseTaxes
Total operating expenses	1,136,156us-gaap_UtilitiesOperatingExpense	1,101,081us-gaap_UtilitiesOperatingExpense	1,068,682us-gaap_UtilitiesOperatingExpense
Operating income	299,697us-gaap_OperatingIncomeLoss	286,842us-gaap_OperatingIncomeLoss	273,721us-gaap_OperatingIncomeLoss
Other Income and Deductions:
Interest income	8,483us-gaap_InvestmentIncomeInterest	10,043us-gaap_InvestmentIncomeInterest	13,072us-gaap_InvestmentIncomeInterest
Gains on available-for-sale securities	10,527us-gaap_GainLossOnInvestments	10,612us-gaap_GainLossOnInvestments	12,965us-gaap_GainLossOnInvestments
Other income	12,048us-gaap_OtherIncome	10,572us-gaap_OtherIncome	12,746us-gaap_OtherIncome
Gain on sale of First Choice	0pnm_GainOnSaleOfBusinessSegment	0pnm_GainOnSaleOfBusinessSegment	1,012pnm_GainOnSaleOfBusinessSegment
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
Interest Charges	119,627us-gaap_InterestExpense	121,448us-gaap_InterestExpense	120,845us-gaap_InterestExpense
Earnings before Income Taxes	200,647	175,069	175,035
Income Taxes	69,738us-gaap_IncomeTaxExpenseBenefit	59,513us-gaap_IncomeTaxExpenseBenefit	54,910us-gaap_IncomeTaxExpenseBenefit
Net Earnings	130,909us-gaap_ProfitLoss	115,556us-gaap_ProfitLoss	120,125us-gaap_ProfitLoss
(Earnings) Attributable to Valencia Non-controlling Interest	(14,127)	(14,521)	(14,050)
Net Earnings Attributable to Company	116,254us-gaap_NetIncomeLoss	100,507us-gaap_NetIncomeLoss	105,547us-gaap_NetIncomeLoss
Preferred Stock Dividends Requirements	(528)us-gaap_DividendsPreferredStock	(528)us-gaap_DividendsPreferredStock	(528)us-gaap_DividendsPreferredStock
Net Earnings Available for PNM Common Stock	116,254	100,507	105,547
Net Earnings Attributable to PNMR per Common Share:
Basic (dollars per share)	$ 1.46us-gaap_EarningsPerShareBasic	$ 1.26us-gaap_EarningsPerShareBasic	$ 1.32us-gaap_EarningsPerShareBasic
Diluted (dollars per share)	$ 1.45us-gaap_EarningsPerShareDiluted	$ 1.25us-gaap_EarningsPerShareDiluted	$ 1.31us-gaap_EarningsPerShareDiluted
Public Service Company of New Mexico [Member]
Electric Operating Revenues	1,147,914	1,116,312	1,092,264
Operating Expenses:
Cost of energy	403,626	374,710	353,649
Administrative and general	152,645	157,144	169,285
Energy production costs	185,638	175,819	185,403
Regulatory disallowances	1,062	12,235	0
Depreciation and amortization	109,524	103,826	97,291
Transmission and distribution costs	43,128	45,936	46,039
Taxes other than income taxes	39,578	37,457	34,715
Total operating expenses	935,201	907,127	886,382
Operating income	212,713	209,185	205,882
Other Income and Deductions:
Interest income	8,557	10,182	13,243
Gains on available-for-sale securities	10,527	10,612	12,965
Other income	8,949	7,650	8,126
Gain on sale of First Choice			0
Other (deductions)	(7,218)	(6,974)	(7,801)
Net other income and deductions	20,815	21,470	26,533
Interest Charges	79,442	79,175	76,101
Earnings before Income Taxes	154,086	151,480	156,314
Income Taxes	52,633	48,804	50,713
Net Earnings	101,453	102,676	105,601
(Earnings) Attributable to Valencia Non-controlling Interest	(14,127)	(14,521)	(14,050)
Net Earnings Attributable to Company	87,326	88,155	91,551
Preferred Stock Dividends Requirements	(528)	(528)	(528)
Net Earnings Available for PNM Common Stock	86,798	87,627	91,023
Texas-New Mexico Power Company [Member]
Electric Operating Revenues	287,939	271,611	250,140
Operating Expenses:
Cost of energy	67,930	57,606	46,201
Administrative and general	36,982	44,635	40,775
Depreciation and amortization	50,056	50,219	49,340
Transmission and distribution costs	23,443	24,188	25,086
Taxes other than income taxes	23,940	22,778	21,218
Total operating expenses	202,351	199,426	182,620
Operating income	85,588	72,185	67,520
Other Income and Deductions:
Interest income	0	0	1
Other income	2,865	2,377	4,698
Gain on sale of First Choice			0
Other (deductions)	(727)	(458)	(1,959)
Net other income and deductions	2,138	1,919	2,740
Interest Charges	27,396	27,393	28,161
Earnings before Income Taxes	60,330	46,711	42,099
Income Taxes	22,523	17,621	15,352
Net Earnings	37,807	29,090	26,747
(Earnings) Attributable to Valencia Non-controlling Interest	0	0	0
Net Earnings Attributable to Company	37,807	29,090	26,747
Preferred Stock Dividends Requirements	0	0	0
Net Earnings Available for PNM Common Stock	$ 37,807	$ 29,090	$ 26,747

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The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

This element represents a sum total of expenses not separately reflected on the income statement for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

+ References

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-Name Accounting Standards Codification

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Number 210

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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-Publisher FASB

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- Definition

Amount of operating expense of regulated operation.

+ References

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- Definition

Amount of operating expense for taxes other than income taxes of regulated operation.

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