<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<!--Created by IRIS Business Services Ltd., Powered by IRIS Carbon, Unique Code 64271ff654148f1e9c94e27f, Generated At Fri, 31 Mar 2023 18:06:40 GMT-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_CollectionsAndPaymentsForFinancialLiabilityInstruments" xlink:label="CollectionsAndPaymentsForFinancialLiabilityInstruments" xlink:title="CollectionsAndPaymentsForFinancialLiabilityInstruments" />
    <link:label xlink:type="resource" xlink:label="label_CollectionsAndPaymentsForFinancialLiabilityInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_CollectionsAndPaymentsForFinancialLiabilityInstruments" xml:lang="en" id="label_CollectionsAndPaymentsForFinancialLiabilityInstruments">Collections and Payments for Financial Liability Instruments</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CollectionsAndPaymentsForFinancialLiabilityInstruments" xlink:to="label_CollectionsAndPaymentsForFinancialLiabilityInstruments" xlink:title="Label : CollectionsAndPaymentsForFinancialLiabilityInstruments to label_CollectionsAndPaymentsForFinancialLiabilityInstruments" />
    <link:label xlink:type="resource" xlink:label="label_CollectionsAndPaymentsForFinancialLiabilityInstruments_1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:title="label_CollectionsAndPaymentsForFinancialLiabilityInstruments_1" xml:lang="en" id="label_CollectionsAndPaymentsForFinancialLiabilityInstruments_1">The cash inflow (outflow) for financial liability instruments classified as financing activities.</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CollectionsAndPaymentsForFinancialLiabilityInstruments" xlink:to="label_CollectionsAndPaymentsForFinancialLiabilityInstruments_1" xlink:title="Label : CollectionsAndPaymentsForFinancialLiabilityInstruments to label_CollectionsAndPaymentsForFinancialLiabilityInstruments_1" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:label="CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:title="CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate" />
    <link:label xlink:type="resource" xlink:label="label_CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xml:lang="en" id="label_CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate">Customer Related Intangible Assets Recognised as of Balance Sheet Date</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:to="label_CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:title="Label : CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate to label_CustomerRelatedIntangibleAssetsRecognisedAsOfBalanceSheetDate" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:label="TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:title="TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate" />
    <link:label xlink:type="resource" xlink:label="label_TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xml:lang="en" id="label_TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate">Technology Based Intangible Assets Recognised as of Balance Sheet Date</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:to="label_TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate" xlink:title="Label : TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate to label_TechnologyBasedIntangibleAssetsRecognisedAsOfBalanceSheetDate" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_TechnicalInstallationsAndOtherTangibleFixedAssets" xlink:label="TechnicalInstallationsAndOtherTangibleFixedAssets" xlink:title="TechnicalInstallationsAndOtherTangibleFixedAssets" />
    <link:label xlink:type="resource" xlink:label="label_TechnicalInstallationsAndOtherTangibleFixedAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_TechnicalInstallationsAndOtherTangibleFixedAssets" xml:lang="en" id="label_TechnicalInstallationsAndOtherTangibleFixedAssets">Technical Installations and Other Tangible Fixed Assets</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TechnicalInstallationsAndOtherTangibleFixedAssets" xlink:to="label_TechnicalInstallationsAndOtherTangibleFixedAssets" xlink:title="Label : TechnicalInstallationsAndOtherTangibleFixedAssets to label_TechnicalInstallationsAndOtherTangibleFixedAssets" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_FinancialAssetsAtFairValueLongTerm" xlink:label="FinancialAssetsAtFairValueLongTerm" xlink:title="FinancialAssetsAtFairValueLongTerm" />
    <link:label xlink:type="resource" xlink:label="label_FinancialAssetsAtFairValueLongTerm" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_FinancialAssetsAtFairValueLongTerm" xml:lang="en" id="label_FinancialAssetsAtFairValueLongTerm">Financial Assets At Fair Value Long Term</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinancialAssetsAtFairValueLongTerm" xlink:to="label_FinancialAssetsAtFairValueLongTerm" xlink:title="Label : FinancialAssetsAtFairValueLongTerm to label_FinancialAssetsAtFairValueLongTerm" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_CurrentPersonnelReceivables" xlink:label="CurrentPersonnelReceivables" xlink:title="CurrentPersonnelReceivables" />
    <link:label xlink:type="resource" xlink:label="label_CurrentPersonnelReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_CurrentPersonnelReceivables" xml:lang="en" id="label_CurrentPersonnelReceivables">Current Personnel Receivables</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CurrentPersonnelReceivables" xlink:to="label_CurrentPersonnelReceivables" xlink:title="Label : CurrentPersonnelReceivables to label_CurrentPersonnelReceivables" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_FinancialAssetsAtFairValueShortTerm" xlink:label="FinancialAssetsAtFairValueShortTerm" xlink:title="FinancialAssetsAtFairValueShortTerm" />
    <link:label xlink:type="resource" xlink:label="label_FinancialAssetsAtFairValueShortTerm" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_FinancialAssetsAtFairValueShortTerm" xml:lang="en" id="label_FinancialAssetsAtFairValueShortTerm">Financial Assets At Fair Value Short Term</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinancialAssetsAtFairValueShortTerm" xlink:to="label_FinancialAssetsAtFairValueShortTerm" xlink:title="Label : FinancialAssetsAtFairValueShortTerm to label_FinancialAssetsAtFairValueShortTerm" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_SubscribedCapital" xlink:label="SubscribedCapital" xlink:title="SubscribedCapital" />
    <link:label xlink:type="resource" xlink:label="label_SubscribedCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_SubscribedCapital" xml:lang="en" id="label_SubscribedCapital">Subscribed Capital</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SubscribedCapital" xlink:to="label_SubscribedCapital" xlink:title="Label : SubscribedCapital to label_SubscribedCapital" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_RetainedEarningsAndOtherReserves" xlink:label="RetainedEarningsAndOtherReserves" xlink:title="RetainedEarningsAndOtherReserves" />
    <link:label xlink:type="resource" xlink:label="label_RetainedEarningsAndOtherReserves" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_RetainedEarningsAndOtherReserves" xml:lang="en" id="label_RetainedEarningsAndOtherReserves">Retained Earnings and Other Reserves</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RetainedEarningsAndOtherReserves" xlink:to="label_RetainedEarningsAndOtherReserves" xlink:title="Label : RetainedEarningsAndOtherReserves to label_RetainedEarningsAndOtherReserves" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_ReservesInConsolidatedCompanies" xlink:label="ReservesInConsolidatedCompanies" xlink:title="ReservesInConsolidatedCompanies" />
    <link:label xlink:type="resource" xlink:label="label_ReservesInConsolidatedCompanies" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_ReservesInConsolidatedCompanies" xml:lang="en" id="label_ReservesInConsolidatedCompanies">Reserves in Consolidated Companies</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ReservesInConsolidatedCompanies" xlink:to="label_ReservesInConsolidatedCompanies" xlink:title="Label : ReservesInConsolidatedCompanies to label_ReservesInConsolidatedCompanies" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_ProfitLossAttributableToParentCompany" xlink:label="ProfitLossAttributableToParentCompany" xlink:title="ProfitLossAttributableToParentCompany" />
    <link:label xlink:type="resource" xlink:label="label_ProfitLossAttributableToParentCompany" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_ProfitLossAttributableToParentCompany" xml:lang="en" id="label_ProfitLossAttributableToParentCompany">Profit (Loss) Attributable to Parent Company</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ProfitLossAttributableToParentCompany" xlink:to="label_ProfitLossAttributableToParentCompany" xlink:title="Label : ProfitLossAttributableToParentCompany to label_ProfitLossAttributableToParentCompany" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_NoncurrentObligationsAndOtherNegotiableSecurities" xlink:label="NoncurrentObligationsAndOtherNegotiableSecurities" xlink:title="NoncurrentObligationsAndOtherNegotiableSecurities" />
    <link:label xlink:type="resource" xlink:label="label_NoncurrentObligationsAndOtherNegotiableSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_NoncurrentObligationsAndOtherNegotiableSecurities" xml:lang="en" id="label_NoncurrentObligationsAndOtherNegotiableSecurities">Noncurrent Obligations and Other Negotiable Securities</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NoncurrentObligationsAndOtherNegotiableSecurities" xlink:to="label_NoncurrentObligationsAndOtherNegotiableSecurities" xlink:title="Label : NoncurrentObligationsAndOtherNegotiableSecurities to label_NoncurrentObligationsAndOtherNegotiableSecurities" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_CurrentObligationsAndOtherNegotiableSecurities" xlink:label="CurrentObligationsAndOtherNegotiableSecurities" xlink:title="CurrentObligationsAndOtherNegotiableSecurities" />
    <link:label xlink:type="resource" xlink:label="label_CurrentObligationsAndOtherNegotiableSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_CurrentObligationsAndOtherNegotiableSecurities" xml:lang="en" id="label_CurrentObligationsAndOtherNegotiableSecurities">Current Obligations And Other Negotiable Securities</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CurrentObligationsAndOtherNegotiableSecurities" xlink:to="label_CurrentObligationsAndOtherNegotiableSecurities" xlink:title="Label : CurrentObligationsAndOtherNegotiableSecurities to label_CurrentObligationsAndOtherNegotiableSecurities" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_WorkPerformedByOtherEntities" xlink:label="WorkPerformedByOtherEntities" xlink:title="WorkPerformedByOtherEntities" />
    <link:label xlink:type="resource" xlink:label="label_WorkPerformedByOtherEntities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_WorkPerformedByOtherEntities" xml:lang="en" id="label_WorkPerformedByOtherEntities">Work Performed By Other Entities</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="WorkPerformedByOtherEntities" xlink:to="label_WorkPerformedByOtherEntities" xlink:title="Label : WorkPerformedByOtherEntities to label_WorkPerformedByOtherEntities" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_AncillaryAndOtherCurrentManagementIncome" xlink:label="AncillaryAndOtherCurrentManagementIncome" xlink:title="AncillaryAndOtherCurrentManagementIncome" />
    <link:label xlink:type="resource" xlink:label="label_AncillaryAndOtherCurrentManagementIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_AncillaryAndOtherCurrentManagementIncome" xml:lang="en" id="label_AncillaryAndOtherCurrentManagementIncome">Ancillary and Other Current Management Income</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AncillaryAndOtherCurrentManagementIncome" xlink:to="label_AncillaryAndOtherCurrentManagementIncome" xlink:title="Label : AncillaryAndOtherCurrentManagementIncome to label_AncillaryAndOtherCurrentManagementIncome" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_LossesImpairmentAndVariationOfProvisionsForCommercialOperations" xlink:label="LossesImpairmentAndVariationOfProvisionsForCommercialOperations" xlink:title="LossesImpairmentAndVariationOfProvisionsForCommercialOperations" />
    <link:label xlink:type="resource" xlink:label="label_LossesImpairmentAndVariationOfProvisionsForCommercialOperations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_LossesImpairmentAndVariationOfProvisionsForCommercialOperations" xml:lang="en" id="label_LossesImpairmentAndVariationOfProvisionsForCommercialOperations">Losses Impairment and Variation of Provisions for Commercial Operations</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="LossesImpairmentAndVariationOfProvisionsForCommercialOperations" xlink:to="label_LossesImpairmentAndVariationOfProvisionsForCommercialOperations" xlink:title="Label : LossesImpairmentAndVariationOfProvisionsForCommercialOperations to label_LossesImpairmentAndVariationOfProvisionsForCommercialOperations" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_OtherCurrentManagementCosts" xlink:label="OtherCurrentManagementCosts" xlink:title="OtherCurrentManagementCosts" />
    <link:label xlink:type="resource" xlink:label="label_OtherCurrentManagementCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_OtherCurrentManagementCosts" xml:lang="en" id="label_OtherCurrentManagementCosts">Other Current Management Costs</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OtherCurrentManagementCosts" xlink:to="label_OtherCurrentManagementCosts" xlink:title="Label : OtherCurrentManagementCosts to label_OtherCurrentManagementCosts" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment" xlink:label="ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment" xlink:title="ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment" />
    <link:label xlink:type="resource" xlink:label="label_ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment" xml:lang="en" id="label_ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment">Impairment Loss and Gains on Disposals of Property, Plant and Equipment</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment" xlink:to="label_ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment" xlink:title="Label : ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment to label_ImpairmentLossAndGainsOnDisposalsOfPropertyPlantAndEquipment" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments" xlink:label="FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments" xlink:title="FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments" />
    <link:label xlink:type="resource" xlink:label="label_FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments" xml:lang="en" id="label_FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments">Finance Income from Marketable Securities and Other Financial Instruments</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments" xlink:to="label_FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments" xlink:title="Label : FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments to label_FinanceIncomeFromMarketableSecuritiesAndOtherFinancialInstruments" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_FinanceIncomeFromThirdParties" xlink:label="FinanceIncomeFromThirdParties" xlink:title="FinanceIncomeFromThirdParties" />
    <link:label xlink:type="resource" xlink:label="label_FinanceIncomeFromThirdParties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_FinanceIncomeFromThirdParties" xml:lang="en" id="label_FinanceIncomeFromThirdParties">Finance Income from Third Parties</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinanceIncomeFromThirdParties" xlink:to="label_FinanceIncomeFromThirdParties" xlink:title="Label : FinanceIncomeFromThirdParties to label_FinanceIncomeFromThirdParties" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_GainsLossesOnChangeInFairValueOfFinancialInstruments" xlink:label="GainsLossesOnChangeInFairValueOfFinancialInstruments" xlink:title="GainsLossesOnChangeInFairValueOfFinancialInstruments" />
    <link:label xlink:type="resource" xlink:label="label_GainsLossesOnChangeInFairValueOfFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_GainsLossesOnChangeInFairValueOfFinancialInstruments" xml:lang="en" id="label_GainsLossesOnChangeInFairValueOfFinancialInstruments">Gains (Losses) on Change in Fair Value of Financial Instruments</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GainsLossesOnChangeInFairValueOfFinancialInstruments" xlink:to="label_GainsLossesOnChangeInFairValueOfFinancialInstruments" xlink:title="Label : GainsLossesOnChangeInFairValueOfFinancialInstruments to label_GainsLossesOnChangeInFairValueOfFinancialInstruments" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments" xlink:label="GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments" xlink:title="GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments" />
    <link:label xlink:type="resource" xlink:label="label_GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments" xml:lang="en" id="label_GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments">Gains (Losses) on Change in Fair Value of Trading Securities and Other Financial Instruments</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments" xlink:to="label_GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments" xlink:title="Label : GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments to label_GainsLossesOnChangeInFairValueOfTradingSecuritiesAndOtherFinancialInstruments" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_ReservesInConsolidatedCompaniesMember" xlink:label="ReservesInConsolidatedCompaniesMember" xlink:title="ReservesInConsolidatedCompaniesMember" />
    <link:label xlink:type="resource" xlink:label="label_ReservesInConsolidatedCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_ReservesInConsolidatedCompaniesMember" xml:lang="en" id="label_ReservesInConsolidatedCompaniesMember">Reserves in Consolidated Companies [Member]</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ReservesInConsolidatedCompaniesMember" xlink:to="label_ReservesInConsolidatedCompaniesMember" xlink:title="Label : ReservesInConsolidatedCompaniesMember to label_ReservesInConsolidatedCompaniesMember" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_ProfitLossAttributableToParentCompanyMember" xlink:label="ProfitLossAttributableToParentCompanyMember" xlink:title="ProfitLossAttributableToParentCompanyMember" />
    <link:label xlink:type="resource" xlink:label="label_ProfitLossAttributableToParentCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_ProfitLossAttributableToParentCompanyMember" xml:lang="en" id="label_ProfitLossAttributableToParentCompanyMember">Profit (Loss) Attributable to Parent Company [Member]</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ProfitLossAttributableToParentCompanyMember" xlink:to="label_ProfitLossAttributableToParentCompanyMember" xlink:title="Label : ProfitLossAttributableToParentCompanyMember to label_ProfitLossAttributableToParentCompanyMember" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_IncreaseDecreaseThroughOtherMovements" xlink:label="IncreaseDecreaseThroughOtherMovements" xlink:title="IncreaseDecreaseThroughOtherMovements" />
    <link:label xlink:type="resource" xlink:label="label_IncreaseDecreaseThroughOtherMovements" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_IncreaseDecreaseThroughOtherMovements" xml:lang="en" id="label_IncreaseDecreaseThroughOtherMovements">Increase (Decrease) Through Other Movements</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="IncreaseDecreaseThroughOtherMovements" xlink:to="label_IncreaseDecreaseThroughOtherMovements" xlink:title="Label : IncreaseDecreaseThroughOtherMovements to label_IncreaseDecreaseThroughOtherMovements" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments" xlink:label="AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments" xlink:title="AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments" />
    <link:label xlink:type="resource" xlink:label="label_AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments" xml:lang="en" id="label_AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments">Adjustments for Gain (Loss) on Derecognition and Disposal of Financial Instruments</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments" xlink:to="label_AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments" xlink:title="Label : AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments to label_AdjustmentsForGainLossOnDerecognitionAndDisposalOfFinancialInstruments" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities" xlink:label="AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities" xlink:title="AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities" />
    <link:label xlink:type="resource" xlink:label="label_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities" xml:lang="en" id="label_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities">Adjustments for Decrease (Increase) in other Non Current Assets and Liabilities</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities" xlink:to="label_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities" xlink:title="Label : AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities to label_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_CollectionsAndPaymentsForEquityInstruments" xlink:label="CollectionsAndPaymentsForEquityInstruments" xlink:title="CollectionsAndPaymentsForEquityInstruments" />
    <link:label xlink:type="resource" xlink:label="label_CollectionsAndPaymentsForEquityInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_CollectionsAndPaymentsForEquityInstruments" xml:lang="en" id="label_CollectionsAndPaymentsForEquityInstruments">Collections and Payments for Equity Instruments</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CollectionsAndPaymentsForEquityInstruments" xlink:to="label_CollectionsAndPaymentsForEquityInstruments" xlink:title="Label : CollectionsAndPaymentsForEquityInstruments to label_CollectionsAndPaymentsForEquityInstruments" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:label="ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:title="ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities" />
    <link:label xlink:type="resource" xlink:label="label_ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities" xml:lang="en" id="label_ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities">Proceeds from Unsecured Bank Loans Classified As Financing Activities</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:to="label_ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:title="Label : ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities to label_ProceedsFromUnsecuredBankLoansClassifiedAsFinancingActivities" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities" xlink:label="ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities" xlink:title="ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities" />
    <link:label xlink:type="resource" xlink:label="label_ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities" xml:lang="en" id="label_ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities">Proceeds from other Borrowings Classified as Financing Activities</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities" xlink:to="label_ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities" xlink:title="Label : ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities to label_ProceedsFromOtherBorrowingsClassifiedAsFinancingActivities" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:label="RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:title="RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities" />
    <link:label xlink:type="resource" xlink:label="label_RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities" xml:lang="en" id="label_RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities">Repayments of Unsecured Bank Loans Classified As Financing Activities</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:to="label_RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities" xlink:title="Label : RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities to label_RepaymentsOfUnsecuredBankLoansClassifiedAsFinancingActivities" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities" xlink:label="RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities" xlink:title="RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities" />
    <link:label xlink:type="resource" xlink:label="label_RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities" xml:lang="en" id="label_RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities">Repayments of other Borrowings Classified as Financing Activities</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities" xlink:to="label_RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities" xlink:title="Label : RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities to label_RepaymentsOfOtherBorrowingsClassifiedAsFinancingActivities" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_ProfitLossAttributableToNoncontrollingInterest" xlink:label="ProfitLossAttributableToNoncontrollingInterest" xlink:title="ProfitLossAttributableToNoncontrollingInterest" />
    <link:label xlink:type="resource" xlink:label="label_ProfitLossAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_ProfitLossAttributableToNoncontrollingInterest" xml:lang="en" id="label_ProfitLossAttributableToNoncontrollingInterest">Profit (Loss) Attributable to Noncontrolling Interest</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ProfitLossAttributableToNoncontrollingInterest" xlink:to="label_ProfitLossAttributableToNoncontrollingInterest" xlink:title="Label : ProfitLossAttributableToNoncontrollingInterest to label_ProfitLossAttributableToNoncontrollingInterest" />
    <link:loc xlink:type="locator" xlink:href="9598000XPMA4HRVG3Z89-2022-12-31.xsd#nxt_ProfitForYearFromDiscontinuedOperationsBeforeTaxes" xlink:label="ProfitForYearFromDiscontinuedOperationsBeforeTaxes" xlink:title="ProfitForYearFromDiscontinuedOperationsBeforeTaxes" />
    <link:label xlink:type="resource" xlink:label="label_ProfitForYearFromDiscontinuedOperationsBeforeTaxes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="label_ProfitForYearFromDiscontinuedOperationsBeforeTaxes" xml:lang="en" id="label_ProfitForYearFromDiscontinuedOperationsBeforeTaxes">Profit for Year from Discontinued Operations, Before Taxes</link:label>
    <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ProfitForYearFromDiscontinuedOperationsBeforeTaxes" xlink:to="label_ProfitForYearFromDiscontinuedOperationsBeforeTaxes" xlink:title="Label : ProfitForYearFromDiscontinuedOperationsBeforeTaxes to label_ProfitForYearFromDiscontinuedOperationsBeforeTaxes" />
  </link:labelLink>
</link:linkbase>