Transcanada Corporation operates as an energy infrastructure company in North America. The company operates in three segments: Natural Gas Pipelines, Oil Pipelines, and Energy. The Natural Gas Pipelines segment owns and operates energy infrastructure, including natural gas pipelines and regulated gas storage facilities. Its natural gas pipeline systems consist of a network of approximately 57,000 kilometers (KMs) of wholly owned natural gas pipelines, and approximately 11,500 kms of partially owned natural gas pipelines; and regulated natural gas storage facilities with a total capacity of 250 billion cubic feet. The Oil Pipelines segment operates Keystone crude oil pipeline system, which includes 3,467 kilometers of Wood River/Patoka and Cushing Extension sections. The Energy segment engages in the acquisition, development, construction, ownership, and operation of electrical power generation plants; purchase and marketing of electricity; provision of electricity account services to energy and industrial customers; and development, construction, ownership, and operation of non-regulated natural gas storage in Alberta, Canada. It has interests in approximately 10,900 megawatts of power generation plants with hydro, natural gas, coal, wind, and nuclear sources; and owns and controls approximately 130 billion cubic feet of unregulated natural gas storage capacity. The company was founded in 1951 and is headquartered in Calgary, Canada.