China Coal Xinji Energy Co., Ltd.
Public Service Electric & Gas Co.
Chongqing Gas Group Corp. Ltd.Chongqing, China
CleanAIR Systems, Inc.New Mexico, United States
Luca Technologies, Inc.Colorado, United States
Tokyo Electric Power Co. Holdings, Inc.Tokyo-to, Japan
Beijing Prova Energy Holding Co., Ltd.
GoTek Energy, Inc.California, United States
Oberösterreichische Ferngas AGAustria
Hubei Heyuan Gas Co., Ltd.Hubei Sheng, China
CHOREN Industries GmbHGermany
Tonen General Sekiyu KKChiba-ken, Japan