Hydrogen internal combustion engine (HICE) vehicles are presently offered for commercial sale by only two U.S. companies, ISE Corporation and Quantum.  Several other companies, including BMW and major automobile manufacturers, are involved in the development of HICE vehicle technologies, although many of these companies will not be selling HICE vehicles for several years, if ever.

TransPower's Preferred Supplier Network includes both ISE and Quantum, and will be expanded as additional suppliers of HICE vehicles emerge.