- Dominion Resources, Inc., and Consolidated Natural Gas Company ( )
- BP Amoco p.l.c., and Atlantic Richfield Company ( )
- El Paso Energy Corporation ( )
- CMS Energy Corporation ( )
- British Petroleum Company, The, p.l.c., and Amoco Corporation ( )
- Shell Oil Company and Tejas Energy, LL ( )
- Exxon Corporation, The Shell Petroleum Company Limited, and Shell Oil Company, In the Matter of ( )
- PacifiCorp, In the Matter of ( )
- Shell Oil Company and Texaco Inc. ( )
- Phillips Petroleum Company ( )
- NGC Corporation ( )