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Algoma Power
• Serving: Algoma District
Atikokan Hydro Inc.
Bluewater Power Distribution Corporation
• Serving: Sarnia, Point Edward, Petrolia, Alvinston, Oil Springs and Watford
Brant County Power Inc.
Brantford Power Inc.
Burlington Hydro Inc.
Cambridge and North Dumfries Hydro Inc.
Canadian Niagara Power Co. Ltd
• Serving: Fort Erie and Port Colborne
Centre Wellington Hydro Ltd.
• Serving: Elora and Fergus
Chapleau Public Utilities Corporation
Collus PowerStream
• Serving: Collingwood, Stayner, Creemore and Thornbury
Co-operative Hydro Embrun
Cornwall Electric
• Serving: Cornwall, South Glengarry, South Stormont, and the Ontario portion of the Mohawk Territory of Akwesasne
E.L.K. Energy Inc.
• Serving: Essex, Harrow, Belle River, Comber, Kingsville and Cottham
Eastern Ontario Power
• Serving: Gananoque
Enersource Hydro Mississauga Inc. 
Entegrus Powerlines Inc.
• Serving: Parkhill, Strathroy, Mount Brydges, Newbury, Dutton, Wallaceburg, Dresden, Bothwell, Thamesville, Ridgetown, Chatham-Kent, Blenheim, Merlin, Tilbury, Wheatley, Erieau
EnWin Utilities Ltd.
• Serving: Windsor
Erie Thames Powerlines Corporation
• Serving: Aylmer, Belmont, Burgessville, Beachville, Clinton, Embro, Ingersoll, Otterville, Port Stanley, Norwich, Tavistock and Thamesford, West Perth
Espanola Regional Hydro Distribution Corporation
• Serving: Espanola, Webbwood and Massey
Essex Power Corporation
• Serving: Amherstburg, LaSalle, Leamington and Tecumseh
Festival Hydro Inc.
• Serving: Stratford, St. Mary's, Seaforth, Hensall, Brussels, Zurich and Dashwood
Five Nations Energy Inc.
• Serving: Attawapiskat, Fort Albany and Kashechewan
Fort Frances Power Corp.
Greater Sudbury Hydro
• Serving Greater Sudbury and the Municipality of West Nipissing
Grimsby Power Inc.
Guelph Hydro
• Serving: Guelph and Rockwood
Haldimand County Hydro Inc.
Halton Hills Hydro
Hearst Power Distribution Company Limited
Horizon Utilities Corporation 
• Serving: Hamilton and St. Catharines
Hydro Hawkesbury Inc./Hawkesbury Hydro Inc
• Phone: (613) 632-6689
Hydro One Brampton Inc.
Hydro One Networks
• Serving: Most of rural Ontario
Hydro One Remotes
• Serving: 19 Communities not connected to the grid
Hydro Ottawa
• Serving: Ottawa and Casselman
Innisfil Hydro
Kenora Hydro Electric Corporation Ltd.
Kingston (Utilities Kingston)
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Kitchener-Wilmot Hydro Inc.
Lakefront Utilities Inc.
• Serving: Cobourg
Lakeland Power Distribution Ltd.
• Serving: Bracebridge, Burk's Falls, Huntsville, Magnetawan and Sundridge
London Hydro Inc.
Midland Power Utility Corporation
Milton Hydro
Newmarket-Tay Power Distribution Ltd.
Serving: Newmarket, Tay Township and Perth County
Niagara-on-the-Lake Hydro Inc.
• Serving: Niagara-on-the-Lake, Virgil, Glendale, St. Davids and Queenston
Niagara Peninsula Energy Inc.
• Serving: Niagara Falls, Lincoln, Pelham and West Lincoln
Norfolk Power Inc.
North Bay Hydro
Northern Ontario Wires Inc.
• Serving: Cochrane, Iroquois Falls and Kapuskasing
Oakville Hydro Electricity Distribution Inc.
Orangeville Hydro
• Serving: Orangeville and Grand Valley
Orillia Power
Oshawa PUC Networks Inc.
Ottawa River Power Corporation
• Serving: Almonte, Beachburg, Killaloe and Pembroke
Parry Sound Power Corporation
Peterborough Distribution Inc.
• Serving: Peterborough, Lakefield and Norwood
PowerStream Inc.
• Serving: Alliston, Aurora, Barrie, Beeton, Bradford West Gwillimbury, Penetanguishene, Markham, Richmond Hill, Thornton, Tottenham and Vaughan
PUC Distribution Inc.
• Serving: Sault Ste. Marie
Renfrew Hydro
Rideau St. Lawrence Distribution Inc.
• Serving: Westport, Prescott, Cardinal, Iroquois, Morrisburg and Williamsburg
• Phone: (613) 925-3851
Sioux Lookout Hydro Electric Commission
St. Thomas Energy Inc.
Thunder Bay Hydro
Tillsonburg Hydro Inc.
Toronto Hydro Electric System
Veridian
• Serving: Ajax, Beaverton, Belleville, Bowmanville, Cannington, Gravenhurst, Newcastle, Orono, Pickering, Port Hope, Port Perry, Sunderland and Uxbridge
Wasaga Distribution Inc.
• Serving: Wasaga Beach
Waterloo North Hydro
• Serving: Waterloo, Township of Woolwich and Township of Wellesley
Welland Hydro-Electric System Corp.
Wellington North Power Inc.
• Serving: Holstein, Mount Forest and Arthur
West Coast Huron Energy
• Serving: Goderich
Westario Power
• Serving: Hanover, Huron-Kinloss, Kincardine, Saugeen Shores, South Bruce, Wingham, Brockton and Minto
Whitby Hydro Electric Corporation
Woodstock Hydro Services
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