-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 AF94vbfT5r1byHW+BBz7k26MUhHStIwmFJIyXR99zB7zJEhxVdx29VzkW08TW+Rl
 18PFXItgHMIv3j1Fw1iezA==

<SEC-DOCUMENT>0001104659-03-016743.txt : 20030805
<SEC-HEADER>0001104659-03-016743.hdr.sgml : 20030805
<ACCEPTANCE-DATETIME>20030805215754
ACCESSION NUMBER:		0001104659-03-016743
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030801
FILED AS OF DATE:		20030805

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			TC PIPELINES GP INC
		CENTRAL INDEX KEY:			0001257868
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-26091
		FILM NUMBER:		03824977

	MAIL ADDRESS:	
		STREET 1:		110 TURNPIKE ROAD SUITE 203
		CITY:			WESTBOROUGH
		STATE:			MA
		ZIP:			01581-263

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:		110 TURNPIKE ROAD SUITE 203
		CITY:			WESTBOROUGH
		STATE:			MA
		ZIP:			01581
		BUSINESS PHONE:		5088717046

	MAIL ADDRESS:	
		STREET 1:		110 TURNPIKE RD
		STREET 2:		SUITE 203
		CITY:			WESTBOROUGH
		STATE:			MA
		ZIP:			01581
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>a3.xml
<DESCRIPTION>3
<TEXT>
<XML>
<?xml version="1.0" encoding="utf-8"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType>
  <periodOfReport>2003-08-01</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001075607</issuerCik>
        <issuerName>TC PIPELINES LP</issuerName>
        <issuerTradingSymbol>TCLP</issuerTradingSymbol>
  </issuer>
  <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001257868</rptOwnerCik>
            <rptOwnerName>TC PIPELINES GP INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>110 TURNPIKE ROAD SUITE 203</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WESTBOROUGH</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01581-263</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
      <isDirector>0</isDirector>
      <isOfficer>0</isOfficer>
      <isTenPercentOwner>1</isTenPercentOwner>
      <isOther>1</isOther>
      <otherText>General Partner</otherText>
    </reportingOwnerRelationship>
  </reportingOwner>
  <nonDerivativeTable>
    <nonDerivativeHolding>
      <securityTitle>
        <value>Common Units representing limited partner interests.</value>
      </securityTitle>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>936435</value>
          <footnoteId id="F1"/>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </nonDerivativeHolding>
  </nonDerivativeTable>
  <derivativeTable>
    <derivativeHolding>
      <securityTitle>
        <value>Subordinated Units</value>
      </securityTitle>
      <conversionOrExercisePrice>
        <value>0</value>
        <footnoteId id="F2"/>
      </conversionOrExercisePrice>
      <exerciseDate>
        <value>2003-08-01</value>
      </exerciseDate>
      <expirationDate>
        <value>2003-08-01</value>
        <footnoteId id="F3"/>
      </expirationDate>
      <underlyingSecurity>
        <underlyingSecurityTitle>
          <value>Common Units</value>
        </underlyingSecurityTitle>
        <underlyingSecurityShares>
          <value>936435</value>
          <footnoteId id="F1"/>
        </underlyingSecurityShares>
      </underlyingSecurity>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </derivativeHolding>
  </derivativeTable>
  <footnotes>
    <footnote id="F1">Subordinated units held, 2,809,306.  Reporting person converted, in accordance with the terms of the limited partnership agreement, 936,435 on August 1, 2002, and 936, 435 on August 1,
2003.  936,436 remain.  Conversion on a one-for-one basis into common units.</footnote>
    <footnote id="F2">936,435 subordinated units converted into common units on August 1, 2003 on a one-for-one basis for no additional consideration.</footnote>
    <footnote id="F3">Subordinated units have no expiration date.  Next date for conversion of remaining subordinated units, if terms of limited partnership agreement met, is August 1, 2004.</footnote>
  </footnotes>
  <ownerSignature>
    <signatureName>/s/ Theresa Jang</signatureName>
    <signatureDate>2003-08-05</signatureDate>
  </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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