TransCanada Corp. operates as an energy infrastructure company in North America. The company operates its business through two segments Pipelines and Energy. The Pipelines segment is principally comprised of TransCanada's natural gas pipelines in Canada, the United States and Mexico. The Energy segment includes power generation and non-regulated gas storage. Its business roots back to March 21, 1951 when its subsidiary was established as TransCanada Pipe Lines Ltd. TransCanada was founded on February 25, 2003 and is headquartered in Calgary, Canada.