Ontario Hydro was the official name from 1974 of the Hydro-Electric Power Commission of Ontario which was established in 1906 by the provincial Power Commission Act to build transmission lines to supply municipal utilities with electricity generated by private companies already operating at Niagara Falls. It soon developed its own generation resources by buying private generation stations and then becoming a major designer and builder of new stations.
Ontario Hydro is the predecessor of the Hydro One.Independent Electricity System Operator.Ontario Power Generation.Electrical Safety Authority.Ontario Electricity Financial Corporation.