Utility Companies
Local electricity utilities or local distribution companies
- Atitokan Hydro Inc.
- Bluewater Power Distribution Corporation
- Brant County Power Inc.
- Brantford Power Inc.
- Burlington Hydro Inc.
- Cambridge and North Dumfries Hydro Inc.
- Canadian Niagara Power Co. Ltd.
- Centre Wellington Hydro Ltd.
- Chatham-Kent Energy Inc.
- Collus Power Corp. (Collingwood Utility Services)
- Cornwall Electric
- E.L.K. Energy Inc.
- Eastern Ontario Power
- Enersource Hydro Mississauga Inc.
- EnWin Utilities Ltd.
- Erie Thames Powerlines Corporation
- Espanola Regional Hydro Distribution Corporation
- Essex Power Corporation
- Festival Hydro Inc.
- Five Nations Energy Inc.
- Fort Frances Power Corp.
- Great Lakes Power Ltd.
- Greater Sudbury Hydro
- Grimsby Power Inc.
- Guelph Hydro
- Haldimand Country Hydro Inc.
- Halton Hills Hydro
- Hearst Power Distribution Company Limited
- Horizon Utilities Corporation
- Hydro One Brampton Inc.
- Hydro One Networks
- Hydro One Remotes
- Hydro Ottawa
- Innisfil Hydro
- Kenora Hydro Electric Corporation Ltd.
- Kingston Electricity Distribution (Utilities Kingston)
- Kitchener-Wilmot Hydro Inc.
- Lakefront Utilities Inc.
- Lakeland Power Distribution Ltd.
- London Hydro Inc.
- Middlesex Power Distribution Corporation
- Midland Power Utility Corporation
- Milton Hydro
- Newmarket-Tay Power Distribution Ltd.
- Niagara-on-the-Lake Hydro Inc.
- Niagara Peninsula Energy Inc.
- Norfolk Power Inc.
- North Bay Hydro
- Northern Ontario Wires Inc.
- Oakville Hydro
- Orangeville Hydro
- Orillia Power
- Oshawa PUC Networks Inc.
- Ottawa River Power Corporation
- Parry Sound Power Corporation
- Peterborough Distribution Inc.
- PowerStream Inc.
- PUC Distribution Inc.
- Renfrew Hydro
- St. Thomas Energy Inc.
- Tay Hydro
- Thunder Bay Hydro
- Tillsonburg Hydro Inc.
- Toronto Hydro Electric System
- Veridian
- Waterloo North Power
- Welland Hydro-Electric System Corp.
- Wellington North Power Inc.
- West Perth Power Inc.
- Westario Power
- Witby Hydro Electric Corporation
- Woodstock Hydro Services