United States
Foster Wheeler
Raytheon
Exxon
URS Corporation
Arcadis
Duke Energy Corporation
Washington Group International
Aecom
Parsons
BE&K
Black & Veatch
HNTB
Tetra Tech, Inc
HDR
Earth Tech
Carter & Burgess
Jacobs Engineering Group, Inc
CDM
US Army
Mactec, Inc
Sarget & Lundy LLC
The Louis Berger Group, Inc
Bechtel Corporation
Day & Zimmermann Group
Halliburton
CH2M Hill
Lockwood Greene
Germany
Siemens
Norway
Aker Kvaerner
United Kingdom
Mott MacDonald
Halcrow
Atkins
British Petrolum
France
Alcatel
Technip
Australia
SNC Lavlin
Fluor
Japan
Mitsui & Co., Ltd
Toyo Engineering Corporation (Tec)
Mitsubishi Corporation
Kawasaki
JGC Corporation
India
National Thermal Power Corporation
National Hydroelectric Power Corporation Ltd.
Engineers India Limited
TATA
Stup Consultants
M.N. Dastur
Canada
Hatch Mott Macdonald
SNC Lavalin
Fluor
Sweden
ABB