Atlantic Power Corporation owns and operates a fleet of power generation assets in the United States and Canada. As of December 31, 2020, its portfolio consisted of twenty-one operating projects with an aggregate electric generating capacity of approximately 1,723 megawatts on a gross ownership basis and approximately 1,327 MW on a net ownership basis across eleven states in the United States and two provinces in Canada. The company sells its electricity to utilities and other customers.

The company was incorporated in 2004 and is headquartered in Dedham, Massachusetts.