-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 1W/QJWu6cTsvEWx2hlPKXA==

<SEC-DOCUMENT>0001179110-06-011092.txt : 20060516
<SEC-HEADER>0001179110-06-011092.hdr.sgml : 20060516
<ACCEPTANCE-DATETIME>20060516174238
ACCESSION NUMBER:		0001179110-06-011092
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060301
FILED AS OF DATE:		20060516
DATE AS OF CHANGE:		20060516

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CAPSTONE TURBINE CORP
		CENTRAL INDEX KEY:			0001009759
		STANDARD INDUSTRIAL CLASSIFICATION:	ENGINES & TURBINES [3510]
		IRS NUMBER:				954180883
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		21211 NORDHOFF STREET
		CITY:			CHATSWORTH
		STATE:			CA
		ZIP:			91311
		BUSINESS PHONE:		818-734-5300

	MAIL ADDRESS:	
		STREET 1:		21211 NORDHOFF STREET
		CITY:			CHATSWORTH
		STATE:			CA
		ZIP:			91311

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JAGGERS JOHN V
		CENTRAL INDEX KEY:			0001033563
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15957
		FILM NUMBER:		06847171

	BUSINESS ADDRESS:	
		STREET 1:		13455 NOEL RD #1670
		STREET 2:		C/O SEVIN ROSEN FUNDS
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75240
		BUSINESS PHONE:		9727021100

	MAIL ADDRESS:	
		STREET 1:		C/O SEVIN ROSEN FUNDS
		STREET 2:		13455 NOEL ROAD, SUITE 1670
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75240
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4/A -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2006-03-01</periodOfReport>

    <dateOfOriginalSubmission>2006-03-03</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001009759</issuerCik>
        <issuerName>CAPSTONE TURBINE CORP</issuerName>
        <issuerTradingSymbol>CPST</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001033563</rptOwnerCik>
            <rptOwnerName>JAGGERS JOHN V</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>13455 NOEL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1670</rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75240</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-03-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2334</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.16</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>90630</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>54673</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Total common shares of 54,673 represents 43,087 of such common shares currently held by Sevin Rosen Fund V L.P. (&quot;SRFV&quot;), 1,842 of such common shares currently held by Sevin Rosen V Affiliates Fund L.P. (&quot;SRV AFF&quot;), 16 of such common shares currently held by SRB Associates VII L.P. (&quot;SRBVII&quot;), and 9,728 of such common shares currently held by Sevin Rosen VII Affiliates Fund L.P. (&quot;SRVII AFF&quot;).  John Jaggers (&quot;Jaggers&quot;) is a general partner of of SRBVII and the general partner of the general partner of SRFV, SRV AFF, and SRVII AFF.  Jaggers disclaims beneficial ownership of these shares except to his proportionate partnership interest in these shares.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>John V. Jaggers</signatureName>
        <signatureDate>2006-05-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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