Apache Canada Ltd.

BG Canada Exploration

Blackrock Ventures Inc

Centrica Canada Ltd.

Compass Compression Services Ltd

Compton Petroleum Corp.

Crocotta Energy Inc.

Devon Canada Corp.

Enterra Energy Trust

Galleon Energy Inc.

Husky Oil Operations Ltd.

Imperial Oil

National Oilwell Canada Ltd.

Northrock Resources Ltd.

Nova Chemicals Ltd.

Pengrowth Corporation

Penn West Energy

Petroandina Resources Ltd

Petrobakken Energy Ltd.

Primewest Energy Inc.

Rally Energy Corporation

Scimitar Egypt Production Ltd.

Second Wave Petroleum

Shell Canada Limited

SPX Process Equipment

Statoilhydro Canada Ltd.

Sulzer Chemtech USA, Inc.

Suncor Energy Inc.

Tri-Sons Production Services Ltd.

West Energy Ltd.