8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.  20549

___________

FORM 8-K

CURRENT REPORT

Pursuant To Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) May 18, 2011

TC PipeLines, LP

(Exact name of registrant as specified in its charter)

Delaware	000-26091	52-2135448
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer  Identification No.)

13710 FNB Parkway, Suite 300 Omaha, NE	68154-05200
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code (877) 290-2772

(Former name or former address if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 7.01  Regulation FD Disclosure

In accordance with General Instruction B.2.of Form 8-K, the following information shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended.

Representatives of TC PipeLines, LP (the "Partnership") intend to make a presentation in Greenwich, Connecticut, on Wednesday, May 25, 2011 at the National Association of Publicly Traded Partnerships (NAPTP) Master Limited Partnership Investor Conference and will present an overview of the Partnership and discuss its recently closed acquisition of ownership interests in each of Gas Transmission Northwest LLC and Bison Pipeline LLC.  The presentation will be audiocast live beginning at 11:15 a.m. eastern daylight time and available via the Partnership's Investor Centre at www.tcpipelineslp.com.

Item 9.01 Financial Statements and Exhibits.

(d)	Exhibits.
99.1	Press Release dated May 18, 2011.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

TC PipeLines, LP

by:  TC PipeLines GP, Inc.,

its general partner

By: /s/ Donald J. DeGrandis

      Donald J. DeGrandis

      Secretary

Dated:  May 18, 2011

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EX-99.1

EXHIBIT 99.1

NewsRelease

TC PipeLines, LP to Present at

NAPTP Master Limited Partnership Conference

OMAHA, Nebraska – May 18, 2011 – TC PipeLines, LP (NASDAQ: TCLP) (the Partnership) will be presenting at the National Association of Publicly Traded Partnerships (NAPTP) Master Limited Partnership Investor Conference on Wednesday May 25, 2011 in Greenwich, CT starting at 11:15 a.m. eastern daylight time. Steve Becker, president of the general partner, will present an overview of the Partnership and discuss its recently closed acquisition of ownership interests in each of Gas Transmission Northwest LLC, and Bison Pipeline LLC.

A live audiocast link and a copy of the presentation will be available at the Partnership's Investor Centre at www.tcpipelineslp.com.

TC PipeLines, LP has interests in 5,560 miles of federally regulated U.S. interstate natural gas pipelines which serve markets across the United States and Eastern Canada.  This includes significant interests in Great Lakes Gas Transmission Limited Partnership and Northern Border Pipeline Company as well as 25 percent ownership interest in each of Gas Transmission Northwest LLC, and Bison Pipeline LLC.  TC PipeLines, LP also has 100 percent ownership of North Baja Pipeline, LLC and Tuscarora Gas Transmission Company.  TC PipeLines, LP is managed by its general partner, TC PipeLines GP, Inc., an indirect wholly owned subsidiary of TransCanada Corporation. TC PipeLines GP, Inc. also holds common units of TC PipeLines, LP. Common units of TC PipeLines, LP are quoted on the NASDAQ Global Select Market and trade under the symbol “TCLP.” For more information about TC PipeLines, LP, visit the Partnership’s website at www.tcpipelineslp.com.

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Media Enquiries:	Terry Cunha/Shawn Howard	(403) 920-7859 (800) 608-7859
Investor & Analyst Enquiries:	Lee Evans	(877) 290-2772
	investor_relations@tcpipelineslp.com