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TC PipeLines, LP (NYSE: TCP) is a publicly traded master limited partnership. TransCanada Corporation owns 24.65% of the outstanding units and controls the general partner. TC PipeLines, LP manages and owns natural gas pipelines in the United States including 46.45% of Great Lakes Gas Transmission Limited Partnership, 50% of Northern Border Pipeline Company, 100% of Gas Transmission Northwest, and 100% of Tuscarora Gas Transmission Company. TC PipeLines, LP is based in Calgary, Alberta.