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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001491790-10-000001.txt : 20100513
<SEC-HEADER>0001491790-10-000001.hdr.sgml : 20100513
<ACCEPTANCE-DATETIME>20100513155417
ACCESSION NUMBER:		0001491790-10-000001
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
ITEM INFORMATION:		Investment Company Act Section 3(c)
ITEM INFORMATION:		Section 3(c)(1)
ITEM INFORMATION:		Section 3(c)(7)
FILED AS OF DATE:		20100513
DATE AS OF CHANGE:		20100513
EFFECTIVENESS DATE:		20100513

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Energy Capital Partners II (EquiPower Co-Invest), LP
		CENTRAL INDEX KEY:			0001491790
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-142015
		FILM NUMBER:		10828451

	BUSINESS ADDRESS:	
		STREET 1:		C/OENERGY CAPITAL PARTNERS MANAGEMENT II
		STREET 2:		51 JOHN F. KENNEDY PARKWAY, SUITE 200
		CITY:			SHORT HILLS
		STATE:			NJ
		ZIP:			07078
		BUSINESS PHONE:		(973) 671-6108

	MAIL ADDRESS:	
		STREET 1:		C/OENERGY CAPITAL PARTNERS MANAGEMENT II
		STREET 2:		51 JOHN F. KENNEDY PARKWAY, SUITE 200
		CITY:			SHORT HILLS
		STATE:			NJ
		ZIP:			07078
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0704</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001491790</cik>
        <entityName>Energy Capital Partners II (EquiPower Co-Invest), LP</entityName>
        <issuerAddress>
            <street1>C/OENERGY CAPITAL PARTNERS MANAGEMENT II</street1>
            <street2>51 JOHN F. KENNEDY PARKWAY, SUITE 200</street2>
            <city>SHORT HILLS</city>
            <stateOrCountry>NJ</stateOrCountry>
            <stateOrCountryDescription>NEW JERSEY</stateOrCountryDescription>
            <zipCode>07078</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>(973) 671-6108</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2010</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>-</firstName>
                <lastName>Energy Capital Partners GP II Coinvestment, LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>co Energy Capital Partners Management II</street1>
                <street2>51 John F. Kennedy Parkway, Suite 200</street2>
                <city>Short Hills</city>
                <stateOrCountry>NJ</stateOrCountry>
                <stateOrCountryDescription>NEW JERSEY</stateOrCountryDescription>
                <zipCode>07078</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General partner of the issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>-</firstName>
                <lastName>Energy Capital Partners II, LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>51 John F. Kennedy Parkway, Suite 200</street1>
                <city>Short Hills</city>
                <stateOrCountry>NJ</stateOrCountry>
                <stateOrCountryDescription>NEW JERSEY</stateOrCountryDescription>
                <zipCode>07078</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Managing member of general partner of issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Andrew</firstName>
                <middleName>D.</middleName>
                <lastName>Singer</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Energy Capital Partners II, LLC</street1>
                <street2>51 John F. Kennedy Parkway, Suite 200</street2>
                <city>Short Hills</city>
                <stateOrCountry>NJ</stateOrCountry>
                <stateOrCountryDescription>NEW JERSEY</stateOrCountryDescription>
                <zipCode>07078</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Managing member of managing mamber of general partner of issuer</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Private Equity Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
            <item>3C</item>
            <item>3C.1</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <yetToOccur>true</yetToOccur>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>150000</totalOfferingAmount>
            <totalAmountSold>0</totalAmountSold>
            <totalRemaining>150000</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>0</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Energy Capital Partners II (EquiPower Co-Invest), LP</issuerName>
                <signatureName>/s/ Andrew D. Singer</signatureName>
                <nameOfSigner>Andrew D. Singer</nameOfSigner>
                <signatureTitle>Managing member of managing member of general partner of iss</signatureTitle>
                <signatureDate>2010-05-13</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
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</TEXT>
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