<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-03-14</periodOfReport>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001392016</rptOwnerCik>
            <rptOwnerName>Brown Gregory C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>515 S. 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>EVP, Gen. Counsel, CAO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Convertible Phantom Units</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-03-14</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>438</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>438</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>43496</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Convertible Phantom Units</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-03-14</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>357</value>
                    <footnoteId id="F4"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>357</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>44199</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each Convertible Phantom Unit (&quot;CPU&quot;) is a phantom equity award which includes a performance distribution right (&quot;PDR&quot;) that entitles the holder to distributions at the same rate payable to common unitholders based upon the number of CPUs multiplied by a number ranging from 0 to 4.768 (the &quot;multiplier&quot;) reflecting whether specified performance metrics are attained.</footnote>
        <footnote id="F2">Represents additional CPUs received by the Reporting Person pursuant to the terms of previously granted PDRs.  Each PDR entitles the Reporting Person to additional CPUs with a value equal to the amount of distributions paid on each common unit representing a limited partner interest in BBEP (a &quot;common unit&quot;).   On March 14, 2014, BBEP paid a cash distribution to holders of its common units in an amount equal to 16.42 cents per common unit. Pursuant to the terms of the PDRs, the Reporting Person received a number of additional CPUs in respect of each PDR with a value (based on the closing price of BBEP's common units on the distribution date ($20.16)) equal to the per unit amount of the distribution. Currently, the multiplier for these CPUs is &quot;1.25.&quot;</footnote>
        <footnote id="F3">On December 28, 2015, the CPUs will be settled for a number of common units determined by multiplying each CPU by the multiplier.</footnote>
        <footnote id="F4">Represents additional CPUs received by the Reporting Person pursuant to the terms of previously granted PDRs. Each PDR entitles the Reporting Person to additional CPUs with a value equal to the amount of distributions paid on each common unit. On March 14, 2014, BBEP paid a cash distribution to holders of its common units in an amount equal to 16.42 cents per common unit. Pursuant to the terms of the PDRs, the Reporting Person received a number of additional CPUs in respect of each PDR with values (based on the closing price of BBEP's common units on the distribution date ($20.16)) equal to the per unit amount of the distributions. Currently, the multiplier for these CPUs is &quot;1.&quot;</footnote>
        <footnote id="F5">On December 28, 2016, the CPUs will be settled for a number of common units determined by multiplying each CPU by the multiplier.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Roberta E. Kass, Attorney-in-Fact</signatureName>
        <signatureDate>2014-03-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
