|TransCanada Corporation (TransCanada) is a North American energy infrastructure company focused on natural gas pipelines, oil pipelines and energy. During the year ended December 31, 2011, natural gas pipelines accounted for approximately 49% of its revenues, oil pipelines had 9% of its revenues and energy accounted for approximately 42% of the Company's revenues. The Company's segments include natural gas pipelines, oil pipelines and energy. In July 2013, TC PipeLines, LP announced the closing of its acquisition of an additional 45% interest in each of Gas Transmission Northwest LLC (GTN) and Bison Pipeline LLC (Bison) from subsidiaries of TransCanada Corporation. In October 2013, Canadian Solar Inc announced that its wholly owned subsidiary, Canadian Solar Solutions Inc., completed the sale of two solar power plants, Brockville 2 and Burritts Rapids, totaling 16 megawatt AC to TransCanada Corporation.