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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_343F5B4F97FE0E539E7C4692749B2CEA" xlink:to="lab_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_343F5B4F97FE0E539E7C4692749B2CEA" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_8188604D3424A6BF4C8C4692749B95EF_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_8188604D3424A6BF4C8C4692749B95EF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Differences from translation of subsidiaries' financial statements</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_8188604D3424A6BF4C8C4692749B95EF_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_8188604D3424A6BF4C8C4692749B95EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax</link:label>
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    <link:label id="lab_us-gaap_Dividends_92C081F297FAE867D7EF4692749DE0CB_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_Dividends_92C081F297FAE867D7EF4692749DE0CB" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Dividends</link:label>
    <link:label id="lab_us-gaap_Dividends_92C081F297FAE867D7EF4692749DE0CB_label_en-US" xlink:label="lab_us-gaap_Dividends_92C081F297FAE867D7EF4692749DE0CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends</link:label>
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    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest_9FBD2C33E5DA047A6B774692749DE049_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest_9FBD2C33E5DA047A6B774692749DE049" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustment of Additional Paid In Capital and Noncontrolling Interests from Investment in Noncontrolling Interests</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest_9FBD2C33E5DA047A6B774692749DE049_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest_9FBD2C33E5DA047A6B774692749DE049" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Additional Paid in Capital, Reallocation of Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest_9FBD2C33E5DA047A6B774692749DE049" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_A67F577DD032299B6C4D4692749D5AB4_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_A67F577DD032299B6C4D4692749D5AB4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends in common stock under Dividend Reinvestment Plan, shares</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_A67F577DD032299B6C4D4692749D5AB4_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_A67F577DD032299B6C4D4692749D5AB4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, Dividend Reinvestment Plan</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_A67F577DD032299B6C4D4692749D5AB4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_A67F577DD032299B6C4D4692749D5AB4" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_A67F577DD032299B6C4D4692749D5AB4" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_5C2183D270C54FF3EA174692749D0D3B_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_5C2183D270C54FF3EA174692749D0D3B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Dividends in common stock under Dividend Reinvestment Plan, value</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_5C2183D270C54FF3EA174692749D0D3B_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_5C2183D270C54FF3EA174692749D0D3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Dividend Reinvestment Plan</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_5C2183D270C54FF3EA174692749D0D3B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0B98A8DC37DE7899E5AF4692749D452C_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0B98A8DC37DE7899E5AF4692749D452C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Stock option compensation</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0B98A8DC37DE7899E5AF4692749D452C_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0B98A8DC37DE7899E5AF4692749D452C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition</link:label>
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    <link:label id="lab_acfn_StockOptionCompensationOfSubsidiaries_580976D2746CF2EECB1C4692749D0467_terseLabel_en-US" xlink:label="lab_acfn_StockOptionCompensationOfSubsidiaries_580976D2746CF2EECB1C4692749D0467" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Option Compensation of Subsidiaries</link:label>
    <link:label id="lab_acfn_StockOptionCompensationOfSubsidiaries_580976D2746CF2EECB1C4692749D0467_label_en-US" xlink:label="lab_acfn_StockOptionCompensationOfSubsidiaries_580976D2746CF2EECB1C4692749D0467" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Option Compensation of Subsidiaries</link:label>
    <link:label id="lab_acfn_StockOptionCompensationOfSubsidiaries_580976D2746CF2EECB1C4692749D0467_documentation_en-US" xlink:label="lab_acfn_StockOptionCompensationOfSubsidiaries_580976D2746CF2EECB1C4692749D0467" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the amount of stock compensation relating to non-controlling interest.</link:label>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_98CEAD2FCBD722E198754692749DE41F_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_98CEAD2FCBD722E198754692749DE41F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Exercise of warrants</link:label>
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    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_09EED1FA31F730C51E794692749DE313_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_09EED1FA31F730C51E794692749DE313" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balances</link:label>
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    <link:label id="lab_us-gaap_SharesOutstanding_4F7C6388D0182041936C4692749DEAF0_periodEndLabel_en-US" xlink:label="lab_us-gaap_SharesOutstanding_4F7C6388D0182041936C4692749DEAF0" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balances (in shares)</link:label>
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    <link:label id="lab_us-gaap_EquityAbstract_771DD095AF4FD2541D5BEAB342AE9458_label_en-US" xlink:label="lab_us-gaap_EquityAbstract_771DD095AF4FD2541D5BEAB342AE9458" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity [Abstract]</link:label>
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    <link:label id="lab_acfn_ShareBasedCompensationAssumptionsForFairValueTable_E35C02C7EECBD50DD00AEAB342B0C7FF_documentation_en-US" xlink:label="lab_acfn_ShareBasedCompensationAssumptionsForFairValueTable_E35C02C7EECBD50DD00AEAB342B0C7FF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share based compensation - assumptions for fair value [Table]</link:label>
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    <link:label id="lab_acfn_UnallocatedSegmentCosts_A48C9796BED7D4272511F9675D280333_terseLabel_en-US" xlink:label="lab_acfn_UnallocatedSegmentCosts_A48C9796BED7D4272511F9675D280333" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unallocated cost of DSIT and OmniMetrix headquarters</link:label>
    <link:label id="lab_acfn_UnallocatedSegmentCosts_A48C9796BED7D4272511F9675D280333_label_en-US" xlink:label="lab_acfn_UnallocatedSegmentCosts_A48C9796BED7D4272511F9675D280333" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unallocated segment costs</link:label>
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    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment_A3DC1A7774227D2E947ECA8520A171A7_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment_A3DC1A7774227D2E947ECA8520A171A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property and equipment</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment_A3DC1A7774227D2E947ECA8520A171A7_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment_A3DC1A7774227D2E947ECA8520A171A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment_A3DC1A7774227D2E947ECA8520A171A7" xlink:to="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment_A3DC1A7774227D2E947ECA8520A171A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_D6FB601B09A91B7B1E24CA8520A29239_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_D6FB601B09A91B7B1E24CA8520A29239" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible assets</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_D6FB601B09A91B7B1E24CA8520A29239_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_D6FB601B09A91B7B1E24CA8520A29239" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_D6FB601B09A91B7B1E24CA8520A29239" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_D6FB601B09A91B7B1E24CA8520A29239" xlink:to="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_D6FB601B09A91B7B1E24CA8520A29239" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_5D99BEB31B9A5BE74635CA8520A2F055_verboseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_5D99BEB31B9A5BE74635CA8520A2F055" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Goodwill (see Note 7 for allocation to segments)</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_5D99BEB31B9A5BE74635CA8520A2F055_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_5D99BEB31B9A5BE74635CA8520A2F055" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Purchase Price Allocation, Goodwill Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_5D99BEB31B9A5BE74635CA8520A2F055" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired_8B5F798060C698996EEACA8520A2B8A4_totalLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired_8B5F798060C698996EEACA8520A2B8A4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total assets acquired</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired_8B5F798060C698996EEACA8520A2B8A4_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired_8B5F798060C698996EEACA8520A2B8A4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Purchase Price Allocation, Assets Acquired</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired_8B5F798060C698996EEACA8520A2B8A4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities_CB79A29FF3C6002EB8A8CA8520A38B9B_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities_CB79A29FF3C6002EB8A8CA8520A38B9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current liabilities</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities_CB79A29FF3C6002EB8A8CA8520A38B9B_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities_CB79A29FF3C6002EB8A8CA8520A38B9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Purchase Price Allocation, Current Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities_CB79A29FF3C6002EB8A8CA8520A38B9B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice_134634F225B3539730ADCA8520A3BADC_totalLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice_134634F225B3539730ADCA8520A3BADC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Fair value acquired</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice_134634F225B3539730ADCA8520A3BADC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AmortizationOfIntangibleAssets_C26A4DEE56BC83B1EEBBCA852097AB85_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets_C26A4DEE56BC83B1EEBBCA852097AB85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of Intangible Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_C26A4DEE56BC83B1EEBBCA852097AB85" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_C9D25D674FFA7578165732263AF7F719_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_C9D25D674FFA7578165732263AF7F719" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_C9D25D674FFA7578165732263AF7F719" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccountsReceivableMember_9E9F68B0344FE4F2D48B32263AF78A14_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableMember_9E9F68B0344FE4F2D48B32263AF78A14" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts Receivable [Member]</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableMember_9E9F68B0344FE4F2D48B32263AF78A14_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableMember_9E9F68B0344FE4F2D48B32263AF78A14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccountsReceivableMember" xlink:label="loc_us-gaap_AccountsReceivableMember_9E9F68B0344FE4F2D48B32263AF78A14" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessAcquisitionAxis_B5C6E8B79AAD52551F7632263AF7C95F_verboseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_B5C6E8B79AAD52551F7632263AF7C95F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Business acquisitions [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_B5C6E8B79AAD52551F7632263AF7C95F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_B5C6E8B79AAD52551F7632263AF7C95F" xlink:to="lab_us-gaap_BusinessAcquisitionAxis_B5C6E8B79AAD52551F7632263AF7C95F" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EBE8C10A32910C31EB3132263AF74D08_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EBE8C10A32910C31EB3132263AF74D08" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows provided by (used in) operating activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EBE8C10A32910C31EB3132263AF74D08_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EBE8C10A32910C31EB3132263AF74D08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_EBE8C10A32910C31EB3132263AF74D08" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProfitLoss_4C0AE3C5149D39ADF80132263AF7F8C5_terseLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_4C0AE3C5149D39ADF80132263AF7F8C5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Loss</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_4C0AE3C5149D39ADF80132263AF7F8C5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_4DA8170F2D2EA211F2C532263AF73000_totalLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_4DA8170F2D2EA211F2C532263AF73000" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income (loss) to net cash used in operating activities (see Schedule A):</link:label>
    <link:label id="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_4DA8170F2D2EA211F2C532263AF73000_label_en-US" xlink:label="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_4DA8170F2D2EA211F2C532263AF73000" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_4DA8170F2D2EA211F2C532263AF73000" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_5B4383FDD3A7D1971CA932263AF78E33_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_5B4383FDD3A7D1971CA932263AF78E33" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_5B4383FDD3A7D1971CA932263AF78E33_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_5B4383FDD3A7D1971CA932263AF78E33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_5B4383FDD3A7D1971CA932263AF78E33" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_CCEF834B9DC46D5B7EDE32263AF7F168_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_CCEF834B9DC46D5B7EDE32263AF7F168" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows provided by (used in) investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_CCEF834B9DC46D5B7EDE32263AF7F168_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_CCEF834B9DC46D5B7EDE32263AF7F168" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquireRestrictedInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireRestrictedInvestments_7281C542913BD3F140E432263AF7F4C8" xlink:type="locator" />
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    <link:label id="lab_acfn_AmountsFundedForSeveranceAssets_4FD952A431EAA66F191032263AF7ED7A_negatedLabel_en-US" xlink:label="lab_acfn_AmountsFundedForSeveranceAssets_4FD952A431EAA66F191032263AF7ED7A" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Amounts funded for severance assets</link:label>
    <link:label id="lab_acfn_AmountsFundedForSeveranceAssets_4FD952A431EAA66F191032263AF7ED7A_label_en-US" xlink:label="lab_acfn_AmountsFundedForSeveranceAssets_4FD952A431EAA66F191032263AF7ED7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amounts Funded for Severance Assets</link:label>
    <link:label id="lab_acfn_AmountsFundedForSeveranceAssets_4FD952A431EAA66F191032263AF7ED7A_documentation_en-US" xlink:label="lab_acfn_AmountsFundedForSeveranceAssets_4FD952A431EAA66F191032263AF7ED7A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cash outflow relating to the deposits made in dedictated funds in respect of employee termination benefits.</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfShortTermInvestments_474A27DD66DA8322749932263AF73319_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfShortTermInvestments_474A27DD66DA8322749932263AF73319" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale of Short-term Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromSaleOfShortTermInvestments" xlink:label="loc_us-gaap_ProceedsFromSaleOfShortTermInvestments_474A27DD66DA8322749932263AF73319" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireShortTermInvestments_328CCA8AE3399F3BEB5532263AF789CE_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireShortTermInvestments_328CCA8AE3399F3BEB5532263AF789CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Short-term Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquireShortTermInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_328CCA8AE3399F3BEB5532263AF789CE" xlink:type="locator" />
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    <link:label id="lab_acfn_ReleaseOfEscrowDeposits_B951B6E4FD0AD4F305F332263AF7E3DC_terseLabel_en-US" xlink:label="lab_acfn_ReleaseOfEscrowDeposits_B951B6E4FD0AD4F305F332263AF7E3DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Release of escrow deposits</link:label>
    <link:label id="lab_acfn_ReleaseOfEscrowDeposits_B951B6E4FD0AD4F305F332263AF7E3DC_label_en-US" xlink:label="lab_acfn_ReleaseOfEscrowDeposits_B951B6E4FD0AD4F305F332263AF7E3DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Release of escrow deposits</link:label>
    <link:label id="lab_acfn_ReleaseOfEscrowDeposits_B951B6E4FD0AD4F305F332263AF7E3DC_documentation_en-US" xlink:label="lab_acfn_ReleaseOfEscrowDeposits_B951B6E4FD0AD4F305F332263AF7E3DC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Release of escrow deposits</link:label>
    <link:loc xlink:href="acfn-20130930.xsd#acfn_ReleaseOfEscrowDeposits" xlink:label="loc_acfn_ReleaseOfEscrowDeposits_B951B6E4FD0AD4F305F332263AF7E3DC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_76FABA7714C1B8B0F41732263AF71A4E_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_76FABA7714C1B8B0F41732263AF71A4E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by (used in) investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_76FABA7714C1B8B0F41732263AF71A4E_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_76FABA7714C1B8B0F41732263AF71A4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCB6155ABE804FED4D9F32263AF78944_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCB6155ABE804FED4D9F32263AF78944" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows provided by (used in) financing activities:</link:label>
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    <link:label id="lab_acfn_ExerciseOfOptionsAndWarrants_F46CAAF30CD3DDD46B1F32263AF7B01A_verboseLabel_en-US" xlink:label="lab_acfn_ExerciseOfOptionsAndWarrants_F46CAAF30CD3DDD46B1F32263AF7B01A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from employee stock option and warrant exercises</link:label>
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    <link:label id="lab_acfn_ExerciseOfOptionsAndWarrants_F46CAAF30CD3DDD46B1F32263AF7B01A_documentation_en-US" xlink:label="lab_acfn_ExerciseOfOptionsAndWarrants_F46CAAF30CD3DDD46B1F32263AF7B01A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The cash inflow associated with the amount received from holders exercising their stock options and cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_1938BDB65F1F430DB4AC32263AF7CD49_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_1938BDB65F1F430DB4AC32263AF7CD49" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Short-term bank credit, net</link:label>
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