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

    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2003-05-22</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001075773</issuerCik>
        <issuerName>ALTERNATE ENERGY CORP</issuerName>
        <issuerTradingSymbol>ARGY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001283811</rptOwnerCik>
            <rptOwnerName>FROATS SEAN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3325 NORTH SERVICE ROAD UNIT 105</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BURLINGTON ON  CANADA</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Secretary</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Shares</value>
                <footnoteId id="F4"/>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>50000000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Corporate (see explanation below)</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5000000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See note</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>.10</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2003-07-07</value>
            </exerciseDate>
            <expirationDate>
                <value>2006-07-07</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1000000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Mr. Froats is the beneficial owner of 50% of First Flotialla (BWI) Inc.that owns 50,000,000 shares in AEC I entitling it to
50,000,000 Alternate Energy common shares once AEC I makes a distribution. There is no assurance that AEC I will make such a distribution. Currently, Mr. Froats has no independant right to vote, hypothecate or dispose of these shares of Alternate Energy Corp., but is a director of AEC I.</footnote>
        <footnote id="F2">Mr. Froats is the beneficial owner of 5,000,000 of AEC I , Inc. entitling him to 5,000,000 Alternate Energy common shares if AEC I makes a distribution of the shares. There is no assurance that AEC I will make such a distribution. Mr. Froats has no right to vote, hypothecate or dispose of these shares of Alternate Energy Corp.</footnote>
        <footnote id="F3">AEC I Inc., a Nevada corporation, owns 104,870,715 shares of Alternate Energy Corp.</footnote>
        <footnote id="F4">Mr. Froats in conjunction Blaine Froats and Marilyin Froats control the majority of the shares of AEC I, Inc., and thereby may have voting power over all shares of Alternate Energy Corp. held by AEC I. Sean Froats disclaims beneficial ownership of any shares except those as noted above.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Sean Froats</signatureName>
        <signatureDate>2004-03-15</signatureDate>
    </ownerSignature>
</ownershipDocument>

