TC PipeLines, LP is a limited partnership company that acquires, owns and participates in the management of energy infrastructure businesses in North America. The company's pipeline systems transport natural gas in the United States. The company is managed by its General Partner, which is an indirect wholly owned subsidiary of TransCanada. It has equity ownership interests in two natural gas interstate pipeline systems, as well as three wholly-owned and one majority owned pipeline. Collectively, the pipelines are designed to transport approximately 8.9 billion cubic feet per day of natural gas from producing regions and import facilities to market hubs and consuming markets primarily in the Western and Midwestern United States. Its pipeline systems include Great Lakes Gas Transmission Limited Partnership, Northern Border Pipeline Company, Gas Transmission Northwest LLC, Bison Pipeline LLC, North Baja Pipeline, LLC and Tuscarora Gas Transmission Company.