Great Lakes Gas Transmission, a medium-sized 2,115-mile pipeline company, runs from the Minnesota-Manitoba border at Emerson, MN to the Michigan-Ontario border at St. Clair, MI. Owned by TC Energy Corporation and operated by Great Lakes Gas Transmission Company, it operates at full capacity, primarily serving the midstream and marketers sectors. Major customers include TransCanada Pipelines Limited, ANR Pipeline Company, and Tenaska Marketing Ventures. Great Lakes Gas Transmission Limited Partnership became the successor of TransCanada Northern Border Inc., authorized to transport natural gas in interstate commerce.