- Alectra Inc.
- Algoma Power Inc
- Atikokan 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
- Centre Wellington Hydro Ltd.
- Chapleau Public Utilities Corporation
- Collus PowerStream
- Cooperative Embrun Hydro Inc.
- Espanola Regional Hydro Distribution Corp.
- Festival Hydro Inc.
- Fort Frances Power Corporation.
- Greater Sudbury Hydro Inc.
- Grimsby Power Incorporated
- Guelph Hydro Electric Systems Inc.
- Haldimand County
- Haldimand County Hydro Inc.
- Hearst Power Distribution Co. Ltd.
- Hydro 2000 Inc.
- Hydro Ottawa
- Innisfil Hydro Distribution Systems Ltd.
- Kenora H.E. Corp. Ltd.
- Kitchener-Wilmot Hydro Inc.
- Lakefront Utilities Inc.
- Lakeland Power Distribution Ltd.
- London Hydro
- Midland Power Utility Corporation
- Milton Hydro Distribution Inc.
- Niagara Peninsula Energy Inc.
- Niagara-on-the-Lake Hydro Inc.
- Norfolk Power Distribution Inc.
- North Bay Hydro Distribution Ltd.
- Northern Ontario Wires Inc. – Cochrane
- Oakville Hydro Corporation
- Orangeville Hydro Limited
- Orillia Power Distribution Corporation
- Ottawa River Power Corp.
- Parry Sound Power Corporation
- Peterborough Distribution Inc.
- PUC Distribution Inc. (Sault Ste. Marie)
- Renfrew Hydro Inc.
- Rideau St. Lawrence Distribution Ltd.
- Sioux Lookout Hydro Inc.
- St. Thomas Energy Inc.
- Thunder Bay Hydro Electric Distribution. Inc.
- Town of Newmarket
- Veridian Connections Inc.
- Wasaga Distribution Inc.
- Waterloo North Hydro Inc.
- Welland Hydro Electric System Corp.
- Wellington North Power Inc.
- Westario Power Inc.
- Whitby Hydro Electric Corp.
- Woodstock Hydro Services Inc.
- New Brunswick Power
- Saint John Energy
- City of Saskatoon
- SaskPower
- Bella Vista Water Co.
- Litchfield Park Utilities
- Rio Rico Utilities
- North Little Rock
- Pine Bluff Water Authority
- Woodson-Hensley Water Co.
- White Hall Water & Sewer System
- Empire District Electric Co.
- Park Water Co.
- Apple Valley Ranchos Water Corp.
- CalPeco Energy
- Lakeland Electric
- Florida Reliability Coordinating Council Inc. (FRCC)
- Tampa Electric Company
- Midstates Natural Gas Corp.
- Midstates Natural Gas Corp.
- Empire District Electric Co.
- Lansing Board of Water & Light
- Empire District Electric Co.
- Empire District Gas Co.
- Fox River Water
- Midstates Natural Gas Corp.
- Missouri American Water Co.
- Energy North Propane
- Granite State Electric Co.
- Empire District Electric Co.
- Eugene Water and Electric Board
- Seaside Water
- Silverleaf Water Utilties
