- AESI Inc, Milton Ontario
- BG High Voltage Systems, Toronto Ontario
- Bracebrige Hydro, Bracebridge Ontario
- Brampton Hydro, Brampton Ontario
- Canada Cement LaFarge, Woodstock Ontario
- Cansave Consultants, Ottawa Ontario
- Chrysler Canada, Windsor Ontario
- C.I.L., Cornwall Ontario
- Clarington Hydro, Clarington Ontario
- G.M. Diesel, London Ontario
- Hydro Mississauga, Mississauga Ontario
- Imperial Oil, Sarnia Ontario
- Kanata Hydro, Kanata Ontario
- Niagara Falls Hydro, Niagara Falls Ontario
- Niagara-on-the-Lake Hydro, Niagara-on-the-Lake Ontario
- North York Hydro, North York Ontario
- Oglethorpe Power Corporation Georgia G&T Cooperative, Oglethorpe Georgia USA
- Ontario Foodland Coalition, London Ontario
- Ontario Hydro, Toronto Ontario
- Plantech Inc., Markham Ontario
- Praxair Inc., Tonawanda New York USA
- Praxair Canada Inc., Mississauga Ontario
- Pickering Hydro, Pickering Ontario
- Renfrew Hydro, Renfrew Ontario
- Richmond Hill Hydro, Richmond Hill Ontario
- Royal Oak Mines, Timmins Ontario
- Sarnia Hydro, Sarnia Ontario
- Scarborough P.U.C., Scarborough Ontario
- Sunoco Inc., Sarnia Ontario
- Tecumseh Gas, Tecumseh Ontario
- The University of Western Ontario, London Ontario
- Vaughan Hydro, Vaughan Ontario
- Windsor Utilities, Windsor Ontario
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