<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0704</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001481722</cik>
        <entityName>AltEn Opportunity I, LP</entityName>
        <issuerAddress>
            <street1>903 EAST 104TH STREET</street1>
            <street2>SUITE 630</street2>
            <city>KANSAS CITY</city>
            <stateOrCountry>MO</stateOrCountry>
            <stateOrCountryDescription>MISSOURI</stateOrCountryDescription>
            <zipCode>64131</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>816 268-1300</issuerPhoneNumber>
        <jurisdictionOfInc>MISSOURI</jurisdictionOfInc>
        <edgarPreviousNameList>
            <previousName>AltEn Opportunity 1, LP</previousName>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2009</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Phillip</firstName>
                <middleName>C</middleName>
                <lastName>Rouse</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>903 East 104th Street</street1>
                <street2>Suite 610</street2>
                <city>Kansas City</city>
                <stateOrCountry>MO</stateOrCountry>
                <stateOrCountryDescription>MISSOURI</stateOrCountryDescription>
                <zipCode>64131</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>For purposes of offering and related transactions</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Scott</firstName>
                <lastName>Asner</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>903 East 104th Street</street1>
                <street2>Suite 630</street2>
                <city>Kansas City</city>
                <stateOrCountry>MO</stateOrCountry>
                <stateOrCountryDescription>MISSOURI</stateOrCountryDescription>
                <zipCode>64131</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>For purposes of offering and related transactions</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Amit</firstName>
                <lastName>Raizada</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>903 East 104th Street</street1>
                <street2>Suite 630</street2>
                <city>Kansas City</city>
                <stateOrCountry>MO</stateOrCountry>
                <stateOrCountryDescription>MISSOURI</stateOrCountryDescription>
                <zipCode>64131</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>No Revenues</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001481722-10-000003</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2010-01-14</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>500000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>23000000</totalOfferingAmount>
            <totalAmountSold>9015000</totalAmountSold>
            <totalRemaining>13985000</totalRemaining>
            <clarificationOfResponse>Offering amount may be lowered by Issuer.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>21</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>AltEn Opportunity I, LP</issuerName>
                <signatureName>Phillip C. Rouse</signatureName>
                <nameOfSigner>Phillip C. Rouse</nameOfSigner>
                <signatureTitle>Authorized Representative</signatureTitle>
                <signatureDate>2010-12-21</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
