TC PipeLines, LP was formed in 1998 as a Delaware limited partnership to acquire, own and participate in the management of United States-based pipeline assets. TC PipeLines, LP and its subsidiary limited partnerships, TC PipeLines Intermediate Limited Partnership and TC Tuscarora Intermediate Limited Partnership, are collectively referred to herein as "TC PipeLines" or "the Partnership." TC PipeLines GP, Inc., an indirect wholly owned subsidiary of TransCanada Pipelines Limited, which is a wholly owned subsidiary of TransCanada Corporation (TransCanada), is the general partner of the Partnership. The Partnership owns a 30 0eneral partner interest in Northern Border Pipeline Company (Northern Border Pipeline). The remaining 70 0eneral partner interest in Northern Border Pipeline is held by Northern Border Partners, L.P., a publicly traded limited partnership that is controlled by ONEOK, Inc. (ONEOK).  g   

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