Oil-Gas and Refining Companies
- Agip
- BP
- ChevronTexaco
- Equilon/Motiva
- ExxonMobil
- Idemitsu
- KOC/KNPC
- PEMEX
- PDVSA
- Petrobras
- Repsol YPF
- Royal Dutch/Shell
- Saudi Aramco
- Statoil
- Sunoco
- Tesoro
- TotalFinaElf
- ConocoPhillips
- Ultramar Diamond Shamrock
Chemical Companies
- Agrium
- CYTEC
- Eastman Chemical
- Enichem
- FMC
- Henkel
- Lyondell
- Millennium
- Hoechst
- Methanex
- Nova Chemicals
- Quantum
- SABIC
- BASF
Utility Industry
- Reliant Energy
- Mirant
- Southern Company
- Constellation
- TransAlta
- TVA
- Duke Energy
- Dominion
- Edison Mission
- Tucson Electric
- FP&L
Engineering Firms
- ABB Lummus
- Bechtel
- Colt Engineering
- Kellogg Brown & Root
- Fluor Daniel
- Foster Wheeler
- Jacobs Engineering
- JGC
- Parsons
- Shaw Group
- Technip/KTI
- Toyo
- Washington Group
- IFP
