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          <link:definition>999013 - Disclosure - Business activity</link:definition>
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          <link:definition>999014 - Disclosure - Company history</link:definition>
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          <link:definition>999016 - Disclosure - Significant accounting judgements, estimates and assumptions</link:definition>
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          <link:definition>999017 - Disclosure - Restatement of previously issued financial statements</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/SegmentReporting" id="SegmentReporting">
          <link:definition>999018 - Disclosure - Segment Reporting</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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          <link:definition>999019 - Disclosure - Revenue</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/CostOfSales" id="CostOfSales">
          <link:definition>999020 - Disclosure - Cost of sales</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/AdministrationExpenses" id="AdministrationExpenses">
          <link:definition>999021 - Disclosure - Administration expenses</link:definition>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/Share-basedPayments" id="Share-basedPayments">
          <link:definition>999022 - Disclosure - Share-based payments</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/FinanceCostsIncome" id="FinanceCostsIncome">
          <link:definition>999023 - Disclosure - Finance costs/ income</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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          <link:definition>999024 - Disclosure - Profit / (loss) on deconsolidation due to insolvency</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/Taxation" id="Taxation">
          <link:definition>999025 - Disclosure - Taxation</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/PropertyPlantAndEquipment" id="PropertyPlantAndEquipment">
          <link:definition>999026 - Disclosure - Property, plant and equipment</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/IntangibleAssets" id="IntangibleAssets">
          <link:definition>999027 - Disclosure - Intangible assets</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/Goodwill" id="Goodwill">
          <link:definition>999028 - Disclosure - Goodwill</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/PrepaymentsAndOtherReceivables" id="PrepaymentsAndOtherReceivables">
          <link:definition>999029 - Disclosure - Prepayments and other receivables</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/Inventory" id="Inventory">
          <link:definition>999030 - Disclosure - Inventory</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/DepositsAdvancesAndPrepayments" id="DepositsAdvancesAndPrepayments">
          <link:definition>999031 - Disclosure - Deposits, advances and prepayments</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/CashAndCashEquivalents" id="CashAndCashEquivalents">
          <link:definition>999032 - Disclosure - Cash and cash equivalents</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/Leases" id="Leases">
          <link:definition>999033 - Disclosure - Leases</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/OtherPayables-LongTermCurrent" id="OtherPayables-LongTermCurrent">
          <link:definition>999034 - Disclosure - Other Payables - Long term &amp; current</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/TradeAndOtherPayables" id="TradeAndOtherPayables">
          <link:definition>999035 - Disclosure - Trade and other payables</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/DerivativeFinancialInstruments" id="DerivativeFinancialInstruments">
          <link:definition>999036 - Disclosure - Derivative Financial Instruments</link:definition>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/LoansBorrowings" id="LoansBorrowings">
          <link:definition>999037 - Disclosure - Loans &amp; borrowings</link:definition>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/ShareholdersEquity" id="ShareholdersEquity">
          <link:definition>999038 - Disclosure - Shareholders&#8217; equity</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/FinancialInstrumentsAndRiskManagement" id="FinancialInstrumentsAndRiskManagement">
          <link:definition>999039 - Disclosure - Financial instruments and risk management</link:definition>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/LossPerShare" id="LossPerShare">
          <link:definition>999040 - Disclosure - Loss per share</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/RelatedParties" id="RelatedParties">
          <link:definition>999041 - Disclosure - Related parties</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/SubsequentEvents" id="SubsequentEvents">
          <link:definition>999042 - Disclosure - Subsequent events</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/GroupCompanies" id="GroupCompanies">
          <link:definition>999043 - Disclosure - Group companies</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/ApprovalOfFinancialStatements" id="ApprovalOfFinancialStatements">
          <link:definition>999044 - Disclosure - Approval of financial statements</link:definition>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/BasisOfPreparationAndSignificantAccountingPoliciesPolicies" id="BasisOfPreparationAndSignificantAccountingPoliciesPolicies">
          <link:definition>999045 - Disclosure - Basis of preparation and significant accounting policies (Policies)</link:definition>
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          <link:definition>999046 - Disclosure - Basis of preparation and significant accounting policies (Tables)</link:definition>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/RestatementOfPreviouslyIssuedFinancialStatementsTables" id="RestatementOfPreviouslyIssuedFinancialStatementsTables">
          <link:definition>999047 - Disclosure - Restatement of previously issued financial statements (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/SegmentReportingTables" id="SegmentReportingTables">
          <link:definition>999048 - Disclosure - Segment Reporting (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/RevenueTables" id="RevenueTables">
          <link:definition>999049 - Disclosure - Revenue (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/CostOfSalesTables" id="CostOfSalesTables">
          <link:definition>999050 - Disclosure - Cost of sales (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/AdministrationExpensesTables" id="AdministrationExpensesTables">
          <link:definition>999051 - Disclosure - Administration expenses (Tables)</link:definition>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/Share-basedPaymentsTables" id="Share-basedPaymentsTables">
          <link:definition>999052 - Disclosure - Share-based payments (Tables)</link:definition>
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          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/FinanceCostsIncomeTables" id="FinanceCostsIncomeTables">
          <link:definition>999053 - Disclosure - Finance costs/ income (Tables)</link:definition>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/ProfitLossOnDeconsolidationDueToInsolvencyTables" id="ProfitLossOnDeconsolidationDueToInsolvencyTables">
          <link:definition>999054 - Disclosure - Profit / (loss) on deconsolidation due to insolvency (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/TaxationTables" id="TaxationTables">
          <link:definition>999055 - Disclosure - Taxation (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/PropertyPlantAndEquipmentTables" id="PropertyPlantAndEquipmentTables">
          <link:definition>999056 - Disclosure - Property, plant and equipment (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/IntangibleAssetsTables" id="IntangibleAssetsTables">
          <link:definition>999057 - Disclosure - Intangible assets (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/GoodwillTables" id="GoodwillTables">
          <link:definition>999058 - Disclosure - Goodwill (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/PrepaymentsAndOtherReceivablesTables" id="PrepaymentsAndOtherReceivablesTables">
          <link:definition>999059 - Disclosure - Prepayments and other receivables (Tables)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/InventoryTables" id="InventoryTables">
          <link:definition>999060 - Disclosure - Inventory (Tables)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/DepositsAdvancesAndPrepaymentsTables" id="DepositsAdvancesAndPrepaymentsTables">
          <link:definition>999061 - Disclosure - Deposits, advances and prepayments (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/CashAndCashEquivalentsTables" id="CashAndCashEquivalentsTables">
          <link:definition>999062 - Disclosure - Cash and cash equivalents (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/LeasesTables" id="LeasesTables">
          <link:definition>999063 - Disclosure - Leases (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/OtherPayables-LongTermCurrentTables" id="OtherPayables-LongTermCurrentTables">
          <link:definition>999064 - Disclosure - Other Payables - Long term &amp; current (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/TradeAndOtherPayablesTables" id="TradeAndOtherPayablesTables">
          <link:definition>999065 - Disclosure - Trade and other payables (Tables)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/DerivativeFinancialInstrumentsTables" id="DerivativeFinancialInstrumentsTables">
          <link:definition>999066 - Disclosure - Derivative Financial Instruments (Tables)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ShareholdersEquityTables" id="ShareholdersEquityTables">
          <link:definition>999067 - Disclosure - Shareholders&#8217; equity (Tables)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/FinancialInstrumentsAndRiskManagementTables" id="FinancialInstrumentsAndRiskManagementTables">
          <link:definition>999068 - Disclosure - Financial instruments and risk management (Tables)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/LossPerShareTables" id="LossPerShareTables">
          <link:definition>999069 - Disclosure - Loss per share (Tables)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/RelatedPartiesTables" id="RelatedPartiesTables">
          <link:definition>999070 - Disclosure - Related parties (Tables)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/GroupCompaniesTables" id="GroupCompaniesTables">
          <link:definition>999071 - Disclosure - Group companies (Tables)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/BusinessActivityDetailsNarrative" id="BusinessActivityDetailsNarrative">
          <link:definition>999072 - Disclosure - Business activity (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/CompanyHistoryDetailsNarrative" id="CompanyHistoryDetailsNarrative">
          <link:definition>999073 - Disclosure - Company history (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfPropertyPlantAndEquipmentUsefulLivesDetails" id="ScheduleOfPropertyPlantAndEquipmentUsefulLivesDetails">
          <link:definition>999074 - Disclosure - Schedule of property, plant and equipment useful lives (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfEstimatedUsefulLivesOfIntangibleAssetsDetails" id="ScheduleOfEstimatedUsefulLivesOfIntangibleAssetsDetails">
          <link:definition>999075 - Disclosure - Schedule of estimated useful lives of intangible assets (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/BasisOfPreparationAndSignificantAccountingPoliciesDetailsNarrative" id="BasisOfPreparationAndSignificantAccountingPoliciesDetailsNarrative">
          <link:definition>999076 - Disclosure - Basis of preparation and significant accounting policies (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/SignificantAccountingJudgementsEstimatesAndAssumptionsDetailsNarrative" id="SignificantAccountingJudgementsEstimatesAndAssumptionsDetailsNarrative">
          <link:definition>999077 - Disclosure - Significant accounting judgements, estimates and assumptions (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfImpactOnConsolidatedStatementOfProfitOrLossDetails" id="ScheduleOfImpactOnConsolidatedStatementOfProfitOrLossDetails">
          <link:definition>999078 - Disclosure - Schedule of impact on consolidated statement of profit or loss (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfImpactOnConsolidatedStatementOfFinancialPositionDetails" id="ScheduleOfImpactOnConsolidatedStatementOfFinancialPositionDetails">
          <link:definition>999079 - Disclosure - Schedule of impact on consolidated statement of financial position (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfDetailedInformationAboutImpactOnEquityDetails" id="ScheduleOfDetailedInformationAboutImpactOnEquityDetails">
          <link:definition>999080 - Disclosure - Schedule of detailed information about impact on equity (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/RestatementOfPreviouslyIssuedFinancialStatementsDetailsNarrative" id="RestatementOfPreviouslyIssuedFinancialStatementsDetailsNarrative">
          <link:definition>999081 - Disclosure - Restatement of previously issued financial statements (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfSegmentsReportingDetails" id="ScheduleOfSegmentsReportingDetails">
          <link:definition>999082 - Disclosure - Schedule of segments reporting (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfSegmentAssetsAndLiabilitiesExplanatoryDetails" id="ScheduleOfSegmentAssetsAndLiabilitiesExplanatoryDetails">
          <link:definition>999083 - Disclosure - Schedule of segment assets and liabilities explanatory (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfRevenueFromExternalCustomersByGeographicalInformationDetails" id="ScheduleOfRevenueFromExternalCustomersByGeographicalInformationDetails">
          <link:definition>999084 - Disclosure - Schedule of revenue from external customers by geographical information (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/SegmentReportingDetailsNarrative" id="SegmentReportingDetailsNarrative">
          <link:definition>999085 - Disclosure - Segment Reporting (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfRevenueDetails" id="ScheduleOfRevenueDetails">
          <link:definition>999086 - Disclosure - Schedule of revenue (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfRevenueByGeographicalMarketDetails" id="ScheduleOfRevenueByGeographicalMarketDetails">
          <link:definition>999087 - Disclosure - Schedule of revenue by geographical market (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfCostOfSalesDetails" id="ScheduleOfCostOfSalesDetails">
          <link:definition>999088 - Disclosure - Schedule of cost of sales (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfAdministrationExpensesDetails" id="ScheduleOfAdministrationExpensesDetails">
          <link:definition>999089 - Disclosure - Schedule of administration expenses (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/RevenueDetailsNarrative" id="RevenueDetailsNarrative">
          <link:definition>999090 - Disclosure - Revenue (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfWeighted-averageGrantDateFairValueOfRsusGrantedDetails" id="ScheduleOfWeighted-averageGrantDateFairValueOfRsusGrantedDetails">
          <link:definition>999091 - Disclosure - Schedule of weighted-average grant date fair value of the RSUs granted (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfGrantDateFairValueOfDirectorOptionsGrantedDetails" id="ScheduleOfGrantDateFairValueOfDirectorOptionsGrantedDetails">
          <link:definition>999092 - Disclosure - Schedule of grant date fair value of director options granted (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfWeighted-averageGrantDateFairValueOfOptionsGrantedDetails" id="ScheduleOfWeighted-averageGrantDateFairValueOfOptionsGrantedDetails">
          <link:definition>999093 - Disclosure - Schedule of weighted-average grant date fair value of the options granted (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfReconciliationToStatementOfProfitOrLossDetails" id="ScheduleOfReconciliationToStatementOfProfitOrLossDetails">
          <link:definition>999094 - Disclosure - Schedule of reconciliation to statement of profit or loss (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfFinanceCostsAndIncomeDetails" id="ScheduleOfFinanceCostsAndIncomeDetails">
          <link:definition>999095 - Disclosure - Schedule of finance costs and income (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/Share-basedPaymentsDetailsNarrative" id="Share-basedPaymentsDetailsNarrative">
          <link:definition>999096 - Disclosure - Share-based payments (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/FinanceCostsIncomeDetailsNarrative" id="FinanceCostsIncomeDetailsNarrative">
          <link:definition>999097 - Disclosure - Finance costs/ income (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfProfitOnDeconsolidationDetails" id="ScheduleOfProfitOnDeconsolidationDetails">
          <link:definition>999098 - Disclosure - Schedule of profit on deconsolidation (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ProfitLossOnDeconsolidationDueToInsolvencyDetailsNarrative" id="ProfitLossOnDeconsolidationDueToInsolvencyDetailsNarrative">
          <link:definition>999099 - Disclosure - Profit / (loss) on deconsolidation due to insolvency (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/TaxationDetailsNarrative" id="TaxationDetailsNarrative">
          <link:definition>999100 - Disclosure - Taxation (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfReconciliationBetweenTaxesOnIncomeLossesDetails" id="ScheduleOfReconciliationBetweenTaxesOnIncomeLossesDetails">
          <link:definition>999101 - Disclosure - Schedule of reconciliation between taxes on income / losses (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfDeferredTaxLiabilityDetails" id="ScheduleOfDeferredTaxLiabilityDetails">
          <link:definition>999102 - Disclosure - Schedule of deferred tax liability (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfUnrecognisedDeferredTaxAssetsDetails" id="ScheduleOfUnrecognisedDeferredTaxAssetsDetails">
          <link:definition>999103 - Disclosure - Schedule of unrecognised deferred tax assets (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfPropertyPlantAndEquipmentDetails" id="ScheduleOfPropertyPlantAndEquipmentDetails">
          <link:definition>999104 - Disclosure - Schedule of property, plant and equipment (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfIntangibleAssetsDetails" id="ScheduleOfIntangibleAssetsDetails">
          <link:definition>999105 - Disclosure - Schedule of intangible assets (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/GoodwillDetailsNarrative" id="GoodwillDetailsNarrative">
          <link:definition>999106 - Disclosure - Goodwill (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfAcquireesIdentifiableNetAssetsPartialGoodwillMethodDetails" id="ScheduleOfAcquireesIdentifiableNetAssetsPartialGoodwillMethodDetails">
          <link:definition>999107 - Disclosure - Schedule of acquiree&#8217;s identifiable net assets the partial goodwill method (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfAcquireesIdentifiableNetAssetsPartialGoodwillMethodDetailsParenthetical" id="ScheduleOfAcquireesIdentifiableNetAssetsPartialGoodwillMethodDetailsParenthetical">
          <link:definition>999108 - Disclosure - Schedule of acquiree&#8217;s identifiable net assets the partial goodwill method (Details) (Parenthetical)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfCarryingAmountOfGoodwillDetails" id="ScheduleOfCarryingAmountOfGoodwillDetails">
          <link:definition>999109 - Disclosure - Schedule of carrying amount of goodwill (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfPrepaymentsAndOtherReceivablesDetails" id="ScheduleOfPrepaymentsAndOtherReceivablesDetails">
          <link:definition>999110 - Disclosure - Schedule of prepayments and other receivables (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfInventoryDetails" id="ScheduleOfInventoryDetails">
          <link:definition>999111 - Disclosure - Schedule of inventory (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfDepositsAdvancesAndPrepaymentsDetails" id="ScheduleOfDepositsAdvancesAndPrepaymentsDetails">
          <link:definition>999112 - Disclosure - Schedule of deposits, advances, and prepayments (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfCashAndCashEquivalentsDetails" id="ScheduleOfCashAndCashEquivalentsDetails">
          <link:definition>999113 - Disclosure - Schedule of cash and cash equivalents (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfNon-cashInvestingAndFinancingTransactionsDetails" id="ScheduleOfNon-cashInvestingAndFinancingTransactionsDetails">
          <link:definition>999114 - Disclosure - Schedule of non-cash investing and financing transactions (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfRight-of-useAssetsRelatedToLeasedPropertiesDetails" id="ScheduleOfRight-of-useAssetsRelatedToLeasedPropertiesDetails">
          <link:definition>999115 - Disclosure - Schedule of right-of-use assets related to leased properties (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfConsolidatedStatementOfProfitOrLossAndOtherComprehensiveIncomeDetails" id="ScheduleOfConsolidatedStatementOfProfitOrLossAndOtherComprehensiveIncomeDetails">
          <link:definition>999116 - Disclosure - Schedule of consolidated statement of profit or loss and other comprehensive income (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfAmountsRecognizedInStatementOfCashFlowsDetails" id="ScheduleOfAmountsRecognizedInStatementOfCashFlowsDetails">
          <link:definition>999117 - Disclosure - Schedule of amounts recognized in statement of cash flows (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfLeaseLiabilitiesPayableDetails" id="ScheduleOfLeaseLiabilitiesPayableDetails">
          <link:definition>999118 - Disclosure - Schedule of lease liabilities payable (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfLeaseLiabilitiesDetails" id="ScheduleOfLeaseLiabilitiesDetails">
          <link:definition>999119 - Disclosure - Schedule of lease liabilities (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfLeaseLiabilitiesNon-currentAndCurrentDetails" id="ScheduleOfLeaseLiabilitiesNon-currentAndCurrentDetails">
          <link:definition>999120 - Disclosure - Schedule of lease liabilities non-current and current (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/CashAndCashEquivalentsDetailsNarrative" id="CashAndCashEquivalentsDetailsNarrative">
          <link:definition>999121 - Disclosure - Cash and cash equivalents (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/LeasesDetailsNarrative" id="LeasesDetailsNarrative">
          <link:definition>999122 - Disclosure - Leases (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfFutureLeasePaymentsDetails" id="ScheduleOfFutureLeasePaymentsDetails">
          <link:definition>999123 - Disclosure - Schedule of Future Lease Payments (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfTradeAndOtherPayablesDetails" id="ScheduleOfTradeAndOtherPayablesDetails">
          <link:definition>999124 - Disclosure - Schedule of trade and other payables (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfWarrantOutstandingDetails" id="ScheduleOfWarrantOutstandingDetails">
          <link:definition>999125 - Disclosure - Schedule of Warrant Outstanding (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/OtherPayables-LongTermCurrentDetailsNarrative" id="OtherPayables-LongTermCurrentDetailsNarrative">
          <link:definition>999126 - Disclosure - Other Payables - Long term &amp; current (Details Narrative)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfDerivativeLiabilitiesDetails" id="ScheduleOfDerivativeLiabilitiesDetails">
          <link:definition>999127 - Disclosure -  Schedule of Derivative Liabilities (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/DerivativeFinancialInstrumentsDetailsNarrative" id="DerivativeFinancialInstrumentsDetailsNarrative">
          <link:definition>999128 - Disclosure - Derivative Financial Instruments (Details Narrative)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/LoansBorrowingsDetailsNarrative" id="LoansBorrowingsDetailsNarrative">
          <link:definition>999129 - Disclosure - Loans &amp; borrowings (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfShareCapitalDetails" id="ScheduleOfShareCapitalDetails">
          <link:definition>999130 - Disclosure - Schedule of share capital (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfFairValueOfWarrantsDetails" id="ScheduleOfFairValueOfWarrantsDetails">
          <link:definition>999131 - Disclosure - Schedule of Fair Value of the Warrants (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfKeyInputsUsedInOptionPricingModelToCalculateValueOfWarrantsDetails" id="ScheduleOfKeyInputsUsedInOptionPricingModelToCalculateValueOfWarrantsDetails">
          <link:definition>999132 - Disclosure - Schedule of key inputs used in option pricing model to calculate the value of warrants (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/ShareholdersEquityDetailsNarrative" id="ShareholdersEquityDetailsNarrative">
          <link:definition>999133 - Disclosure - Shareholders&#8217; equity (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfUnobservableInputsInFairValueMeasurementWithinLevel3Details" id="ScheduleOfUnobservableInputsInFairValueMeasurementWithinLevel3Details">
          <link:definition>999134 - Disclosure - Schedule of unobservable inputs in fair value measurement within level 3 (Details)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfExpectedContractualMaturitiesDetails" id="ScheduleOfExpectedContractualMaturitiesDetails">
          <link:definition>999135 - Disclosure - schedule of expected contractual maturities (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfSignificantExchangeRatesDetails" id="ScheduleOfSignificantExchangeRatesDetails">
          <link:definition>999136 - Disclosure - Schedule of significant exchange rates (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
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          <link:definition>999137 - Disclosure - Schedule of loss per share (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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          <link:definition>999138 - Disclosure - Schedule of diluted weighted average number of ordinary shares (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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          <link:definition>999139 - Disclosure - schedule of key management personnel (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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        <link:roleType roleURI="http://fusion-fuel.eu/role/FinancialInstrumentsAndRiskManagementDetailsNarrative" id="FinancialInstrumentsAndRiskManagementDetailsNarrative">
          <link:definition>999140 - Disclosure - Financial instruments and risk management (Details Narrative)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/RelatedPartiesDetailsNarrative" id="RelatedPartiesDetailsNarrative">
          <link:definition>999141 - Disclosure - Related parties (Details Narrative)</link:definition>
          <link:usedOn>link:presentationLink</link:usedOn>
          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/ScheduleOfGroupCompaniesDetails" id="ScheduleOfGroupCompaniesDetails">
          <link:definition>999142 - Disclosure - schedule of group companies (Details)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
        </link:roleType>
        <link:roleType roleURI="http://fusion-fuel.eu/role/SubsequentEventsDetailsNarrative" id="SubsequentEventsDetailsNarrative">
          <link:definition>999143 - Disclosure - Subsequent events (Details Narrative)</link:definition>
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          <link:usedOn>link:calculationLink</link:usedOn>
          <link:usedOn>link:definitionLink</link:usedOn>
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    <element id="HTOO_DirectLegalInterestAttributableToParentPercentage" name="DirectLegalInterestAttributableToParentPercentage" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DirectLegalInterestAttributableToNoncontrollingInterestPercentage" name="DirectLegalInterestAttributableToNoncontrollingInterestPercentage" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_TradeNamesRelatedIntangibleAssetsRecognisedAsOfAcquisitionDate" name="TradeNamesRelatedIntangibleAssetsRecognisedAsOfAcquisitionDate" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_FairValueOfIdentifiableNetAssetsPercentage" name="FairValueOfIdentifiableNetAssetsPercentage" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_IncreaseDecreaseThroughNoncashInvestingAndFinancingTransactions" name="IncreaseDecreaseThroughNoncashInvestingAndFinancingTransactions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DepreciationRightsofuseAssets" name="DepreciationRightsofuseAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_FutureMinimumLeasePayments" name="FutureMinimumLeasePayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_PresentValueOfMinimumLeasePayments" name="PresentValueOfMinimumLeasePayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_PaymentOfLeaseLiabilities" name="PaymentOfLeaseLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_NewLeases" name="NewLeases" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_LeaseLiabilitiesRevaluations" name="LeaseLiabilitiesRevaluations" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_LeaseLiabilitiesDisposals" name="LeaseLiabilitiesDisposals" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_LeaseLiabilitiesInterestPaid" name="LeaseLiabilitiesInterestPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_NumberofSharesIssuedOnCommitmentShares" name="NumberofSharesIssuedOnCommitmentShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_NumberOfVehicles" name="NumberOfVehicles" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_AmountsOwedToRelatedParties" name="AmountsOwedToRelatedParties" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_PayrollTaxes" name="PayrollTaxes" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_WarrantsExercisePrice" name="WarrantsExercisePrice" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DescriptionOfExpiryDateOfWarrant" name="DescriptionOfExpiryDateOfWarrant" nillable="true" xbrli:periodType="instant" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_NumberOfWarrantOutstanding" name="NumberOfWarrantOutstanding" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_NumberOfOrdinarySharesOutstanding" name="NumberOfOrdinarySharesOutstanding" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_AcquiredInterestPercentage" name="AcquiredInterestPercentage" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_LeaseAgreementsTermExtending" name="LeaseAgreementsTermExtending" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_FairValueOnInitialRecognitionOfWarrantsUnexercised" name="FairValueOnInitialRecognitionOfWarrantsUnexercised" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_FairValueOnInitialRecognitionOfDerivativeLiabilities" name="FairValueOnInitialRecognitionOfDerivativeLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DecreaseIncreaseDueToConversionsDuringPeriod" name="DecreaseIncreaseDueToConversionsDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DecreaseIncreaseDueToDerecognitionDuringPeriod" name="DecreaseIncreaseDueToDerecognitionDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_GainLossDueToFairValueMovements" name="GainLossDueToFairValueMovements" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_GainLossDueToFairValueMovementsRemeasurement" name="GainLossDueToFairValueMovementsRemeasurement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ReclassificationOfConvertibleNotesOnConsolidation" name="ReclassificationOfConvertibleNotesOnConsolidation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DescriptionOfWarrantCancellationAndExchange" name="DescriptionOfWarrantCancellationAndExchange" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ValueOfShares" name="ValueOfShares" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriod" name="ShareIssuedDuringPeriod" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodValue" name="ShareIssuedDuringPeriodValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodAtTheMarket" name="ShareIssuedDuringPeriodAtTheMarket" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodSharePipe" name="ShareIssuedDuringPeriodSharePipe" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodSharePipeValue" name="ShareIssuedDuringPeriodSharePipeValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodShareMacquarieKeystone" name="ShareIssuedDuringPeriodShareMacquarieKeystone" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodShareMacquarieKeystoneValue" name="ShareIssuedDuringPeriodShareMacquarieKeystoneValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodShareCommitmentService" name="ShareIssuedDuringPeriodShareCommitmentService" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodShareCommitmentServiceValue" name="ShareIssuedDuringPeriodShareCommitmentServiceValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodReverseSplitRounding" name="ShareIssuedDuringPeriodReverseSplitRounding" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodReverseSplitRoundingValue" name="ShareIssuedDuringPeriodReverseSplitRoundingValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodStockConversion" name="ShareIssuedDuringPeriodStockConversion" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ShareIssuedDuringPeriodStockConversionValue" name="ShareIssuedDuringPeriodStockConversionValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_GainLossDueToFairValueMovementsDuringPeriod" name="GainLossDueToFairValueMovementsDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_GainLossDueToFairValueMovementsAtRemeasurement" name="GainLossDueToFairValueMovementsAtRemeasurement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_HurdlePriceShareOptionGranted" name="HurdlePriceShareOptionGranted" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_FairValueOfWarrantOnGrantDate" name="FairValueOfWarrantOnGrantDate" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_NumberOfSharesSold" name="NumberOfSharesSold" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_NumberOfSharesIssuedToBroker" name="NumberOfSharesIssuedToBroker" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_NumberOfSharesIssuedForExerciseOfWarrant" name="NumberOfSharesIssuedForExerciseOfWarrant" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ConversionOfShareRatioDescription" name="ConversionOfShareRatioDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ConversionOfPreferredShareIntoOrdinaryShares" name="ConversionOfPreferredShareIntoOrdinaryShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_WarrantExercisePrice" name="WarrantExercisePrice" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ExerciseNumberOfWarrantAfterPostReverseSplit" name="ExerciseNumberOfWarrantAfterPostReverseSplit" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_StockIssuedDuringPeriodSharesExerciseOfWarrants" name="StockIssuedDuringPeriodSharesExerciseOfWarrants" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ChangesInOwnershipInterest" name="ChangesInOwnershipInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ScheduleOfUnobservableInputsInFairValueMeasurementWithinLevel3Abstract" name="ScheduleOfUnobservableInputsInFairValueMeasurementWithinLevel3Abstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ScheduleOfUnobservableInputsInFairValueMeasurementWithinLevel3Table" name="ScheduleOfUnobservableInputsInFairValueMeasurementWithinLevel3Table" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" />
    <element id="HTOO_CashAndReceivablesCarryingAmount" name="CashAndReceivablesCarryingAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_LiabilitiesCarryingAmount" name="LiabilitiesCarryingAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_EquityCarryingAmount" name="EquityCarryingAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_TotalCarryingAmount" name="TotalCarryingAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ScheduleofExpectedContractualMaturitiesAbstract" name="ScheduleofExpectedContractualMaturitiesAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ScheduleofExpectedContractualMaturitiesTable" name="ScheduleofExpectedContractualMaturitiesTable" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" />
    <element id="HTOO_FinancialLiabilitiesCarryingAmount" name="FinancialLiabilitiesCarryingAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_FinancialLiabilitiesContractualCashFlows" name="FinancialLiabilitiesContractualCashFlows" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_LossPerShareAbstarct" name="LossPerShareAbstarct" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_LossPerShareTable" name="LossPerShareTable" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" />
    <element id="HTOO_LossPerShareLineItems" name="LossPerShareLineItems" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_KeyManagementPersonnelCompensationBonusBenefits" name="KeyManagementPersonnelCompensationBonusBenefits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_CashAndCashEquivalentsPercentage" name="CashAndCashEquivalentsPercentage" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_PercentageOfExchangeRate" name="PercentageOfExchangeRate" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ExchangeRateVariances" name="ExchangeRateVariances" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_NumberOfSharesIssuedValue" name="NumberOfSharesIssuedValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ConvertiblePromissoryNotesDescription" name="ConvertiblePromissoryNotesDescription" nillable="true" xbrli:periodType="instant" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DebtInstrumentFinalInstalment" name="DebtInstrumentFinalInstalment" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_MaximumAggregateOfferingPrice" name="MaximumAggregateOfferingPrice" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_PercentageOfCashCommissionOfGrossProceeds" name="PercentageOfCashCommissionOfGrossProceeds" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DebtInstrumentOfOutstandingBalanceAmount" name="DebtInstrumentOfOutstandingBalanceAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DebtInstrumentOfOutstandingBalancePrecentage" name="DebtInstrumentOfOutstandingBalancePrecentage" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ServicesExpenseReducing" name="ServicesExpenseReducing" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_PercentageOfDiscountToMarket" name="PercentageOfDiscountToMarket" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ExecutionMinimumPaymentAmount" name="ExecutionMinimumPaymentAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_CommerciallyReasonableEffortsToPay" name="CommerciallyReasonableEffortsToPay" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_WarrantsTerm" name="WarrantsTerm" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_AggregateGrossProceeds" name="AggregateGrossProceeds" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_PurchasePrice" name="PurchasePrice" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_PercentageInvestorsOfAggregateSubscription" name="PercentageInvestorsOfAggregateSubscription" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_DescriptionOfAccountingPolicyForDerivativeLiabilitiesWarrantsExplanatory" name="DescriptionOfAccountingPolicyForDerivativeLiabilitiesWarrantsExplanatory" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ReserveOfEquityComponentOfConvertibleInstrument" name="ReserveOfEquityComponentOfConvertibleInstrument" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_WarrantSurrenderValue" name="WarrantSurrenderValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="HTOO_ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsConvertedBasis" name="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsConvertedBasis" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
</schema>
