In 1887, Edison Sault Light and Power Company developed the first hydroelectric generation in the American waters of the St. Marys River. In 1891, Edison Sault Electric Company bought out Edison Sault Light and Power and started the utility that still presently serves the Eastern Upper Peninsula. The Hydroelectric Plant and Power Canal as it exists today began construction in 1898 and was completed in 1902. The powerhouse is 400 metres long and contains 78 horizontal AC generators, making it the longest horizontal shaft hydro facility in the world. Under the most favorable operating conditions this plant has the capability to generate 36 MW of power to Edison Sault Electric Company's customers.