<SEC-DOCUMENT>0001868941-22-000089.txt : 20220902
<SEC-HEADER>0001868941-22-000089.hdr.sgml : 20220902
<ACCEPTANCE-DATETIME>20220902163738
ACCESSION NUMBER:		0001868941-22-000089
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20220901
FILED AS OF DATE:		20220902
DATE AS OF CHANGE:		20220902

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Nebreda Julian
		CENTRAL INDEX KEY:			0001754406

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40978
		FILM NUMBER:		221225691

	MAIL ADDRESS:	
		STREET 1:		4300 WILSON BLVD.
		CITY:			ARLINGTON
		STATE:			VA
		ZIP:			22203

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Fluence Energy, Inc.
		CENTRAL INDEX KEY:			0001868941
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
		IRS NUMBER:				871304612
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		4601 FAIRFAX DRIVE
		STREET 2:		SUITE 600
		CITY:			ARLINGTON
		STATE:			VA
		ZIP:			22203
		BUSINESS PHONE:		(833) 358-3623

	MAIL ADDRESS:	
		STREET 1:		4601 FAIRFAX DRIVE
		STREET 2:		SUITE 600
		CITY:			ARLINGTON
		STATE:			VA
		ZIP:			22203
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_166215103941213.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-09-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001868941</issuerCik>
        <issuerName>Fluence Energy, Inc.</issuerName>
        <issuerTradingSymbol>FLNC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001754406</rptOwnerCik>
            <rptOwnerName>Nebreda Julian</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FLUENCE ENERGY INC.</rptOwnerStreet1>
            <rptOwnerStreet2>4601 FAIRFAX DRIVE, SUITE 600</rptOwnerStreet2>
            <rptOwnerCity>ARLINGTON</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>22203</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Unit</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2022-09-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>138658</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>138658.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>138658</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each restricted stock unit represents a contingent right to receive one share of Class A Common Stock of the Issuer.</footnote>
        <footnote id="F2">The restricted stock units will vest in three equal annual installments with the first installment vesting on September 1, 2023, the second installment vesting on September 1, 2024 and the final installment vesting on September 1, 2025.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Francis A. Fuselier as Attorney-in-fact for Julian Nebreda</signatureName>
        <signatureDate>2022-09-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
