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The company was incorporated in 1951 by a Special Act of Parliament as Trans-Canada Pipe Lines Limited. In 1954 N. Eldon Tanner, president of Merrill Petroleums and former Alberta legislator, became president of the company. The purpose of the company was to develop the TransCanada pipeline (now known as the Canadian Mainline) to supply eastern Canadian markets with natural gas produced in the west.
In 1998, TransCanada Pipelines merged with NOVA Corporation 's pipeline business, keeping the TransCanada name and becoming "the fourth largest energy services company in North America".
Seeking to expand its presence in the United States, in 2016, TransCanada acquired Columbia Pipeline Group (CPG) for US$13 billion from NiSource 's Shareholders. The CPG acquisition added a pipeline network in Pennsylvania and surrounding states, where the Marcellus and Utica shale gas formations are located.
In May 2019, the company changed its name from TransCanada Corporation to TC Energy Corporation to better reflect the company's business, which includes pipelines, power generation and energy storage operations in Canada, the United States and Mexico.
In October 2019, the 56-story Bank of America Center skyscraper in Houston, Texas was renamed as TC Energy Center and serves as the company's US headquarters.
On October 1, 2024, TC Energy completed the spinoff of its Liquids Pipelines business creating an independent company, South Bow, focused on crude oil pipelines.