Alberta

• Alberta Regional Transmission Organization
• ATCO Electric (formerly Alberta Power)
• Canadian Hydro Developers, Inc.
• Central Alberta Rural Electrification Association
• ENMAX (formerly City of Calgary Electric)
• EPCOR (formerly Edmonton Power)
• ESBI Alberta Ltd.(Transmission Administrator of Alberta)
• Lethbridge Power
• The Grid Company of Alberta Inc.
• The Power Pool Of Alberta
• Prairie Power Ltd.
• The Rocky Rural Electrification Association
• South Alta Rural Electrification Association Limited
• TransAlta Utilities Alberta Canada
• UtiliCorp Networks Canada

British Columbia

• BC Hydro
• British Columbia Transmission Corporation
• Columbia Power Corporation
• FortisBC
• Powerex
• Regional Transmission Organization West

Manitoba

• Manitoba Hydro

New Brunswick

• NB Power
• Saint John Energy

Newfoundland

• Fortis Inc.
• Newfoundland and Labrador Hydro
• Newfoundland Power

Ontario

• Barrie Hydro Distribution Inc.
• Bluewater Power Distribution Corporation
• Brampton Hydro Networks Inc.
• Brant County Power Inc.
• Brantford Power Inc.
• Brock Hydro
• Bruce Power
• Cambridge and N. Dumfries Hydro Inc.
• Canadian Niagara Power Inc.
• Centre Wellington Hydro Ltd.
• Chatham-Kent Energy Inc.
• Chatham-Kent Hydro Inc.
• Collus Power Corp.
• Cornwall Electric
• E.L.K. Energy Inc.
• Enersource Hydro Mississauga Inc.
• ENWIN Powerlines Ltd.
• Erie Thames Powerlines Corporation
• Essex Power Lines Corporation
• Festival Hydro Inc. (Stratford PUC)
• Great Lakes Power Limited
• Greater Sudbury Hydro Inc.
• Greater Toronto Hydro
• Grimsby Power Incorporated
• Guelph Hydro Electric systems Inc.
• Halton Hills Hydro Inc.
• Hamilton Hydro Inc.
• Hydro One (formerly Ontario Hydro Services)
• Innisfil Hydro Distribution Systems Ltd.
• Meaford PUC
• Mid-Ontario Energy Services Inc.
• Middlesex Power Dist. Corp. (formerly Strathroy)
• Midland Power Utility Corporation
• Newmarket Hydro Ltd.
• Niagara Falls Hydro Inc.
• Niagara-on-the-Lake Hydro Inc.
• North Bay Hydro Distribution Ltd.
• Northern Ontario Wires Inc. (Formerly Cochrane)
• Oakville HE Distribution Inc.
• Ontario Hydro Energy Inc.
• Ontario Power Generation (Formerly Ontario Hydro)
• Ontario Power Generation Inc.: Customer Site
• Ontario's Independent Electricity Market Operator
• Orangeville Hydro Limited
• Orillia Power Corporation
• Orillia Power Distribution Corporation
• Oshawa P.U.C. Networks Inc.
• Ottawa River Power Corp.
• PowerStream Inc.
• Hydro Ottawa
• Peterborough Distribution Inc.
• Red Rock Hydro
• St. Thomas Energy Inc.
• St. Thomas Energy Services Inc.
• Sudbury Hydro Inc.
• Thessalon Hydro Distribution Corp.
• Thorold Hydro Corporation
• Thunder Bay Hydro Electricity Distrib. Inc.
• Upper Canada Energy Alliance
• Veridian Connections Inc.
• Waterloo North Hydro Inc.
• Wellington Electric Distribution Co. Inc.
• West Coast Huron Energy Inc. (Formerly Goderich)
• Westario Power Inc.
• Woodstock Hydro Services Inc.

Prince Edward Island

• Maritime Electric

Quebec

• Hydro-Québec(en français)
• Hydro-Quebec(in english)
• IREQ Electric Power Research
• TransEnergie

Saskatchewan

• SaskPower

Yukon, Northwest Territories and Nunavut

• Northwest Territories Power Corporation
• Yukon Energy