<SEC-DOCUMENT>0001930676-23-000002.txt : 20230404
<SEC-HEADER>0001930676-23-000002.hdr.sgml : 20230404
<ACCEPTANCE-DATETIME>20230404165457
ACCESSION NUMBER:		0001930676-23-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20230331
FILED AS OF DATE:		20230404
DATE AS OF CHANGE:		20230404

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Edelbach Scott
		CENTRAL INDEX KEY:			0001930676

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40272
		FILM NUMBER:		23798825

	MAIL ADDRESS:	
		STREET 1:		ONE NORTH LEXINGTON AVENUE
		STREET 2:		14TH FLOOR
		CITY:			WHITE PLAINS
		STATE:			NY
		ZIP:			10601

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OPAL Fuels Inc.
		CENTRAL INDEX KEY:			0001842279
		STANDARD INDUSTRIAL CLASSIFICATION:	GAS & OTHER SERVICES COMBINED [4932]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		200 CLARENDON STREET, 55TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		617-531-6300

	MAIL ADDRESS:	
		STREET 1:		200 CLARENDON STREET, 55TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ArcLight Clean Transition Corp. II
		DATE OF NAME CHANGE:	20210125
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_168064168518654.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0407</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-03-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001842279</issuerCik>
        <issuerName>OPAL Fuels Inc.</issuerName>
        <issuerTradingSymbol>OPAL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001930676</rptOwnerCik>
            <rptOwnerName>Edelbach Scott</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE NORTH LEXINGTON AVE, 14TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WHITE PLAINS</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10601</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock options (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>6.97</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2023-03-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>6654</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
                <footnoteId id="F4"/>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <value>2033-03-31</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6654.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6654</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F6"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2023-03-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>12554</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F7"/>
                <footnoteId id="F8"/>
                <footnoteId id="F9"/>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>12554.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22554</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Granted pursuant to the Issuer's 2022 Omnibus Equity Incentive Plan (the &quot;Plan&quot;).</footnote>
        <footnote id="F2">The Reporting Person was granted an option to purchase shares of the Issuer's Class A common stock (the &quot;Option&quot;) at an exercise price of $6.97 per share, which was the closing price per share of the Issuer's Class A common stock on March 31, 2023, as quoted on the Nasdaq Stock Market.  The Option vests in three (3) equal installments on each of the following dates: (i) March 31, 2024, (ii) March 31, 2025, and (iii) March 31, 2026, provided, that the Reporting Person continues to provide services to the Issuer through the applicable vesting date.</footnote>
        <footnote id="F3">In the event that the Reporting Person's employment is terminated by reason of the Reporting Person's disability or termination without cause, the Options shall vest with respect to the number of shares of Class A common stock that would have vested upon the next vesting date following such termination, had the Reporting Person remained an employee.</footnote>
        <footnote id="F4">Notwithstanding the foregoing, upon the occurrence of a termination of employment by reason of the Reporting Person's (i) termination without cause; or (ii) resignation for good reason, in connection with or within the 24 months following the consummation of a Change in Control (as defined in the Plan and the relevant award agreement), any unvested portion of the Option shall accelerate and vest in full.</footnote>
        <footnote id="F5">Upon the occurrence of a termination by reason of the Reporting Person's death, any unvested portion of the Option shall accelerate and vest in full.</footnote>
        <footnote id="F6">Each restricted stock unit represents the contingent right to receive, at settlement, one share of the Issuer's Class A common stock.</footnote>
        <footnote id="F7">The restricted stock units vest in three equal installments on March 31, 2024, March 31, 2025 and March 31, 2026, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date.</footnote>
        <footnote id="F8">In the event that the Reporting Person's employment is terminated by reason of the Reporting Person's disability or termination without cause, the restricted stock units (the &quot;RSUs&quot;) shall vest with respect to the number of RSUs that would have vested upon the next vesting date following such termination had the Reporting Person remained an employee.</footnote>
        <footnote id="F9">Notwithstanding the foregoing, upon the occurrence of a termination of employment by reason of the Reporting Person's (i) termination without cause; or (ii) resignation for good reason, in connection with or within the 24 months following the consummation of a Change in Control (as defined in the Plan and the relevant award agreement), any unvested portion of the RSUs shall accelerate and vest in full.</footnote>
        <footnote id="F10">Upon the occurrence of a termination by reason of the Reporting Person's death, any unvested portion of the RSUs shall accelerate and vest in full.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ John Coghlin as Attorney-in-Fact</signatureName>
        <signatureDate>2023-04-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
