Hydro One Limited is a leading electricity transmission and distribution utility headquartered in Toronto, Ontario. Established as a successor to the former Crown corporation Ontario Hydro, Hydro One has evolved into a publicly traded company offering reliable power delivery across the province. The company’s network spans more than 47,000 circuit kilometres of transmission and distribution lines, serving over 1.4 million residential, commercial and industrial customers.
Hydro One’s core business activities include the operation, maintenance and expansion of high-voltage transmission corridors alongside lower-voltage distribution networks. The company invests in grid modernization initiatives such as smart meters, real-time monitoring systems and advanced asset management tools to enhance reliability and reduce outage durations. In addition to electricity delivery, Hydro One leverages its extensive rights-of-way to provide fiber-optic telecommunications services to public and private sector clients.
Operating exclusively within Ontario, Hydro One’s franchise covers both urban centres and remote northern communities. Its transmission network transports nearly all the province’s electricity supply, connecting power generators—from hydroelectric stations in the north to nuclear and renewable facilities in the south—to local distribution utilities. The company’s distribution arm supplies electricity directly to homes and businesses from Windsor in the west to Cornwall in the east, including many rural and First Nations communities.
Hydro One traces its roots to Ontario Hydro’s restructuring in the late 1990s and underwent partial privatization with an initial public offering in 2015. The company is governed by a board of directors chaired by Mayo Schmidt and led operationally by President and Chief Executive Officer Michael P. Whiting. Under their guidance, Hydro One continues to focus on strengthening grid resilience, integrating sustainable energy resources and maintaining high levels of customer service.
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