TC PipeLines, LP to Commence Trading on the New York Stock Exchange under New Trading Symbol "TCP"

HOUSTON, TEXAS--(Marketwire - Dec. 12, 2011) - TC PipeLines, LP's (NYSE:TCP) (the Partnership) common units will commence trading today on the New York Stock Exchange ("NYSE") under the new symbol "TCP". Steve Becker, president of the general partner, will be ringing the opening bell this morning to commemorate the first day of trading on the NYSE.

TC PipeLines, LP (NYSE:TCP) 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 (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.