| Alberta Environment | |
| AltaGas Ltd. | |
| Anterra Midstream Inc | |
| ARC Resources | |
| ATCO Midstream | |
| Baytex Energy Trust | |
| BP Canada | |
| Canadian Fertilizers Limited | |
| Canadian Natural Resources Limited | |
| Cancarb Ltd. | |
| CCR Technologies Ltd. | |
| City of Medicine Hat | |
| City of Medicine Hat – Gas and Power Utilities | |
| Coastal Resources Limited | |
| ConocoPhillips Canada | |
| County of Newell (MD 4) | |
| Criterion Catalysts & Technologies Canada | |
| Cypress County | |
| ENCANA | |
| ENERMARK | |
| Enerplus Oil and Gas | |
| Enerplus Resources | |
| Foothills Pipelines | |
| Hunt Oil Company of Canada Inc | |
| I-XL Industries | |
| Lakeside Feeders | |
| Landmark Feeds | |
| Nexen Inc. | |
| Nuvista Energy Ltd. | |
| Pengrowth Corporation | |
| Penn West Energy Trust | |
| Petro-Canada | |
| Regent Resources Ltd. | |
| Taqa North | |
| Town of Redcliff | |
| TransCanada Pipelines | |
| Tristar Oil and Gas Ltd. | |
| Zargon Oil & Gas Ltd. |