- ABB Inc.
- Acuity Brands Lighting
- AESI-ACUMEN Engineered Solutions Inc.
- AIRD & BERLIS LLP
- Anixter Canada
- APPrO (Association of Power Producers of Ontario)
- Bel Volt Sales Ltd.
- Black & MCDonald Limited
- Border Ladner Gervais LLP
- Brown & Cohen
- Bruce Power
- Burlington Hydro Inc.
- Cam Tran Co.
- Canadian Nuclear Association
- Composite Power Group Inc.
- Costello Associates Inc.
- Demarco Allan LLP
- Dentons Canada LLP
- E2E Utility Solutions
- Eaton Electrical
- Electrical Safety Authority (ESA)
- Electricity Distributors Association
- Electro-Federation Canada (EFC)
- Elenchus Research Associates
- Enbridge Gas Distribution Inc.
- Enersource Corporation
- Engineers Canada
- Entegrus Inc.
- Enwin Utilities Ltd
- ESRI Canada
- Fortis Ontario Inc.
- G & W Electric
- Gowling Lafleur Henderson LLP
- Guelph Hydro
- HD Supply Utilities
- Horizon Utilities Corp
- Hubbell Power Systems
- Hydro One Inc.
- Independent Electricity System Operator
- Innovative Research Group Inc.
- Intergraph
- Jubb Utility Supply
- K-Line Maintenance & Construction Co. Ltd.
- KPMG LLP
- La Prairie Inc.
- London Economics International LLC
- London Hydro Inc.
- Love Energy Consultant Inc.
- McCarthy Tetrault LLP
- Metsco Energy
- Mitsubishi Electric Power
- NRStor Inc.
- Oakville Hydro
- Ontario Electrical League (OEL)
- Ontario Energy Association
- Ontario Energy Board
- Ontario Power Generation
- Optimus SBR
- Opus One Solutions Inc
- Osler, Hoskin & Harcourt LLP
- Pathchoice Energy Consulting
- Power Workers Union
- PowerStream Inc.
- Powertel Utilities Contractors Limited
- PricewaterhouseCoopers LLP
- Primary Power Designs Inc.
- Professional Engineers Ontario
- Rodan Energy & Metering Solutions
- Rogers Cable Inc.
- RTG Systems Corp.
- S&C Electric Canada Ltd.
- ShawFlex
- Siemens Canada Limited
- Simul Corporation
- SWI – Systemware Innovation
- Tata Consultancy Services Canada Inc.
- TE Connectivity
- Telecon
- The Fixers Communication Group Inc.
- The McGrath Group
- The State Group Inc.
- Thomas & Betts Limited
- Toronto Hydro Corporation
- Trans Power Utility Contractors Inc.
- TransCanada Energy Ltd.
- Union Gas Ltd.,
- Valard Construction LP
- Veridian Corporation
