Zero Emission Industries (ZEI, formerly known as Golden Gate Zero Emission Marine) is a hydrogen technology company developing fuel cell and refueling systems for maritime and road applications. It offers the ZEP 250 solution, a turnkey hydrogen fuel cell powertrain for application in ferries, cruise ships, crew transfer vessels, pilot vessels, yachts, offshore vessels, tug boats, port equipment, container ships, and other vessels; and FTcase, a portable hydrogen refueling device.