TC PipeLines, LP Announces Filing of 2011 Annual Report on Form 10-K

HOUSTON, TEXAS--(Marketwire - Feb. 28, 2012) - TC PipeLines, LP (NYSE:TCP) (the Partnership) today filed its Annual Report on Form 10-K for the year ended December 31, 2011, including audited financial statements, with the U.S. Securities and Exchange Commission.

A copy of the Form 10-K is available under the Investor Center, Regulatory Filings section, of the TC PipeLines, LP website at: www.tcpipelineslp.com/RegulatoryFilings.htm.

TC PipeLines, LP (NYSE:TCP) has interests in over 5,550 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 (NYSE:TRP). TC PipeLines GP, Inc. also holds common units of TC PipeLines, LP. For more information about TC PipeLines, LP, visit the Partnership's website at www.tcpipelineslp.com.