Aquahydrex Inc.
Electrochaea GmbH
EXYTRON GmbH
Hitachi Zosen Corporation
Hydrogenics Corporation
ITM Power PLC
MAN Energy Solutions
McPhy Energy S.A.
MicroPyros GmbH
Nel ASA
Power-to-Gas Hungary Kft.
Siemens AG
Southern California Gas Company (SoCalGas)
thyssenkrupp AG
Uniper SE