Hydrogen is an alternative fuel that can be produced from diverse domestic resources such as fossil fuels, biomass, and water through electrolysis. Producing hydrogen with renewable energy and using it in fuel-cell vehicles holds the promise of virtually pollution-free transportation and independence from imported petroleum. The market for light-, medium-, and heavy-duty fuel cell electric vehicles (FCEVs) is emerging as the government and industry are working towards the clean, economical, and safe production and distribution of hydrogen.