-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 NttZ98tAr+wjDcQzBpZp+nrhrSi/8YzCWFeezUyu97nqbfrxblCG3pag6dNvvt3j
 CJV+KtFzsGUqV7n1LUxiHQ==

<SEC-DOCUMENT>0001019687-07-001663.txt : 20070525
<SEC-HEADER>0001019687-07-001663.hdr.sgml : 20070525
<ACCEPTANCE-DATETIME>20070525165319
ACCESSION NUMBER:		0001019687-07-001663
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070524
FILED AS OF DATE:		20070525
DATE AS OF CHANGE:		20070525

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Littlefair Andrew J
		CENTRAL INDEX KEY:			0001400209

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33480
		FILM NUMBER:		07881206

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(562) 493-2804

	MAIL ADDRESS:	
		STREET 1:		C/O CLEAN ENERGY FUELS CORP
		STREET 2:		3020 OLD RANCH PARKWAY SUITE 200
		CITY:			SEAL BEACH
		STATE:			CA
		ZIP:			90740

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Clean Energy Fuels Corp.
		CENTRAL INDEX KEY:			0001368265
		STANDARD INDUSTRIAL CLASSIFICATION:	GAS & OTHER SERVICES COMBINED [4932]
		IRS NUMBER:				330968580
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3020 OLD RANCH PARKWAY, SUITE 200
		CITY:			SEAL BEACH
		STATE:			CA
		ZIP:			90740
		BUSINESS PHONE:		(562) 493-2804

	MAIL ADDRESS:	
		STREET 1:		3020 OLD RANCH PARKWAY, SUITE 200
		CITY:			SEAL BEACH
		STATE:			CA
		ZIP:			90740

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Clean Energy Fuels, Corp.
		DATE OF NAME CHANGE:	20060703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-05-24</periodOfReport>

    <issuer>
        <issuerCik>0001368265</issuerCik>
        <issuerName>Clean Energy Fuels Corp.</issuerName>
        <issuerTradingSymbol>CLNE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001400209</rptOwnerCik>
            <rptOwnerName>Littlefair Andrew J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3020 OLD RANCH PARKWAY, SUITE 200</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SEAL BEACH</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90740</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President &amp; CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>12.00</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-05-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>525000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2017-05-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>525000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>525000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The stock option was granted to the reporting person under the Issuer's 2006 Equity Incentive Plan.  The option vests as to 1/6 of the total shares subject to the option upon effectiveness of the Issuer's initial public offering, 1/6 will vest upon the completion of six months of service following the effective date of the offering, and thereafter, 1/3 will vest upon the completion of each subsequent year of service until the option is fully vested.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Mitchell W. Pratt, Attorney-in-Fact</signatureName>
        <signatureDate>2007-05-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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