-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Om1U1ulnrnXAY6xBis2ref+CdxSBTtuW0DbQT9q0iRrDDtmOOft+RBbk9Hoom18f
 wRaGcbLui52kAOqHgNlNlA==

<SEC-DOCUMENT>0001140361-09-004257.txt : 20090217
<SEC-HEADER>0001140361-09-004257.hdr.sgml : 20090216
<ACCEPTANCE-DATETIME>20090217140403
ACCESSION NUMBER:		0001140361-09-004257
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090213
FILED AS OF DATE:		20090217
DATE AS OF CHANGE:		20090217

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MARSHALL DAVID
		CENTRAL INDEX KEY:			0001208444

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-26091
		FILM NUMBER:		09610016

	BUSINESS ADDRESS:	
		STREET 1:		997 WANDER WAY
		CITY:			INCLINE VILLAGE
		STATE:			NV
		ZIP:			89451
		BUSINESS PHONE:		7758331811

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TC PIPELINES LP
		CENTRAL INDEX KEY:			0001075607
		STANDARD INDUSTRIAL CLASSIFICATION:	NATURAL GAS TRANSMISSION [4922]
		IRS NUMBER:				522135448
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		13710 FNB PARKWAY
		CITY:			OMAHA
		STATE:			NE
		ZIP:			68154-5200
		BUSINESS PHONE:		8772902772

	MAIL ADDRESS:	
		STREET 1:		13710 FNB PARKWAY
		CITY:			OMAHA
		STATE:			NE
		ZIP:			68154-5200
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-02-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001075607</issuerCik>
        <issuerName>TC PIPELINES LP</issuerName>
        <issuerTradingSymbol>TCLP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001208444</rptOwnerCik>
            <rptOwnerName>MARSHALL DAVID</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>13710 FNB PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>OMAHA</rptOwnerCity>
            <rptOwnerState>NE</rptOwnerState>
            <rptOwnerZipCode>68154-5200</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Distribution Equivalent Rights for Deferred Share Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2009-02-13</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>50</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common units representing limited p/ship interests</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>50</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1872</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">N/A - The distribution equivalent rights accrued on the number of Deferred Share Units (&quot;DSUs&quot;) recorded in his account.  Each distribution equivalent right is the economic equivalent of one DSU.  Upon termination of board service, Common Units representing limited partnership interests may be purchased on the open market on behalf of Mr. Marshall whereby he would receive Common Units in a number equal to the number of DSUs recorded in his account less any applicable withholdings. Alternatively, Mr. Marshall may elect to receive the value of his DSU entitlement in cash.  The cash payment amount shall be determined by multiplying the number of DSUs recorded in his account by the Fair Market Value of a Common Unit less any applicable withholdings.</footnote>
        <footnote id="F2">N/A - the DSUs are fully vested and are redeemable only following Mr. Marshall's termination of Board service.</footnote>
        <footnote id="F3">The distribution amount reflects the number of DSUs added to the director's share unit account as of the record date for the distribution.  Pursuant to the Share Unit Plan for Non-Employee Directors (2007), the distribution amount is calculated based on the declared distribution multiplied by the number of share units in the account, divided by the market value of the common units on the payment date for such distribution.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Donald J. DeGrandis, Attorney for David Marshall</signatureName>
        <signatureDate>2009-02-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----