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    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001298536</cik>
        <entityName>Virent Energy Systems Inc</entityName>
        <issuerAddress>
            <street1>3571 ANDERSON ST</street1>
            <city>MADISON</city>
            <stateOrCountry>WI</stateOrCountry>
            <stateOrCountryDescription>WISCONSIN</stateOrCountryDescription>
            <zipCode>53704</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>608-663-0228</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>G.</firstName>
                <middleName>Leland</middleName>
                <lastName>Edwards</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3571 Anderson Street</street1>
                <city>Madison</city>
                <stateOrCountry>WI</stateOrCountry>
                <stateOrCountryDescription>WISCONSIN</stateOrCountryDescription>
                <zipCode>53704</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Randy</firstName>
                <middleName>Douglas</middleName>
                <lastName>Cortright</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3571 Anderson Street</street1>
                <city>Madison</city>
                <stateOrCountry>WI</stateOrCountry>
                <stateOrCountryDescription>WISCONSIN</stateOrCountryDescription>
                <zipCode>53704</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jeffrey</firstName>
                <middleName>Charles</middleName>
                <lastName>Moore</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3571 Anderson Street</street1>
                <city>Madison</city>
                <stateOrCountry>WI</stateOrCountry>
                <stateOrCountryDescription>WISCONSIN</stateOrCountryDescription>
                <zipCode>53704</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>David</firstName>
                <middleName>Michael</middleName>
                <lastName>Kettner</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3571 Anderson Street</street1>
                <city>Madison</city>
                <stateOrCountry>WI</stateOrCountry>
                <stateOrCountryDescription>WISCONSIN</stateOrCountryDescription>
                <zipCode>53704</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Timothy</firstName>
                <middleName>B.</middleName>
                <lastName>Erdman</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>600 Marshall Drive</street1>
                <city>Waunakee</city>
                <stateOrCountry>WI</stateOrCountry>
                <stateOrCountryDescription>WISCONSIN</stateOrCountryDescription>
                <zipCode>53597-1458</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jay</firstName>
                <lastName>Kouba</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>20 North Wacker Drive</street1>
                <street2>Suite 3410</street2>
                <city>Chicago</city>
                <stateOrCountry>IL</stateOrCountry>
                <stateOrCountryDescription>ILLINOIS</stateOrCountryDescription>
                <zipCode>60606</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <lastName>Neis</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>505 South Rosa Road</street1>
                <city>Madison</city>
                <stateOrCountry>WI</stateOrCountry>
                <stateOrCountryDescription>WISCONSIN</stateOrCountryDescription>
                <zipCode>53719-1277</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
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        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>James</firstName>
                <middleName>D.</middleName>
                <lastName>Sayre</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>12700 Whitewater Drive</street1>
                <street2>MS 143</street2>
                <city>Minnetonka</city>
                <stateOrCountry>MN</stateOrCountry>
                <stateOrCountryDescription>MINNESOTA</stateOrCountryDescription>
                <zipCode>55343</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
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    <offeringData>
        <industryGroup>
            <industryGroupType>Other Energy</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2010-05-28</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
            <isOptionToAcquireType>true</isOptionToAcquireType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>55000000</totalOfferingAmount>
            <totalAmountSold>46419396</totalAmountSold>
            <totalRemaining>8580604</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>18</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>3125000</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Virent Energy Systems Inc</issuerName>
                <signatureName>G. Leland Edwards</signatureName>
                <nameOfSigner>G. Leland Edwards</nameOfSigner>
                <signatureTitle>President and Chief Executive Officer</signatureTitle>
                <signatureDate>2010-06-07</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
