Hydro One delivers electricity across Ontario. Hydro One is a holding company with four subsidiaries, the largest being Hydro One Networks. It operates 97% of the high voltage transmission grid throughout Ontario, and serves 1.3 million customers in rural areas across the province in its capacity as Ontario’s largest distribution utility.

Hydro One works with the transmission and distribution network by connecting Hydro One’s generating facilities to it. The generators deliver the electricity they generate at hydroelectric, coal, natural gas, wind, solar and nuclear facilities to businesses and people across Ontario.