-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 L/Tw44NpoBlKPJHDyXgNZCRN20vPHb3StbeyeodHBAjoQn69sMuMUWfsXaOysTWR
 D7GuMnv0lZ/UpqsZ9e5pRg==

<SEC-DOCUMENT>0001104659-07-016044.txt : 20070302
<SEC-HEADER>0001104659-07-016044.hdr.sgml : 20070302
<ACCEPTANCE-DATETIME>20070302191634
ACCESSION NUMBER:		0001104659-07-016044
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070228
FILED AS OF DATE:		20070302
DATE AS OF CHANGE:		20070302

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			McFarland Bruce D
		CENTRAL INDEX KEY:			0001366185

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33055
		FILM NUMBER:		07669323

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(213) 225-5900

	MAIL ADDRESS:	
		STREET 1:		BREITBURN ENERGY PARTNERS L.P.
		STREET 2:		515 SOUTH FLOWER STREET, SUITE 4800
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90071

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BreitBurn Energy Partners L.P.
		CENTRAL INDEX KEY:			0001357371
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				743169953
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		515 SOUTH FLOWER STREET, SUITE 4800
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90071
		BUSINESS PHONE:		(213) 225-5900

	MAIL ADDRESS:	
		STREET 1:		515 SOUTH FLOWER STREET, SUITE 4800
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90071
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-02-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001357371</issuerCik>
        <issuerName>BreitBurn Energy Partners L.P.</issuerName>
        <issuerTradingSymbol>BBEP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001366185</rptOwnerCik>
            <rptOwnerName>McFarland Bruce D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>515 SOUTH FLOWER STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 4800</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90071</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-02-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3734</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>Common Units representing limited partner interests</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3734</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3734</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each Performance Unit is the economic equivalent of one common unit representing a limited partner interest (&quot;common unit&quot;) in BBEP and is accompanied by a distribution equivalent right, entitling the holder, immediately prior to settlement of the Performance Unit to an additional number of Performance Units based upon the relationship between the amount of distributions paid on a common unit during the period between the vesting commencement date and the settlement date of the Performance Unit and the market price of the common units prior to the payment of such distributions.  On the settlement date, the payment amount will be subject to adjustment by multiplying such payment amount by a factor of 0% to 200% depending on a comparison of the total return on a common unit relative to the total return on the securities of a competitive peer group of companies over a specified period of time.</footnote>
        <footnote id="F2">The Performance Units will be settled for cash or an equal number of common units, at the election of the reporting person, on the third anniversary of January 1, 2007.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Roberta E. Kass, Attorney-in-Fact</signatureName>
        <signatureDate>2007-03-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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