The phosphoric acid (PAFC), polymer electrolyte (PEFC), alkaline (AFC), molten carbonate (MCFC), and solid oxide (SOFC) fuel cell types were reviewed. The PEFC, MCFC, and SOFC are being developed most intensely. The PEFC is most likely to be used to supply portable equipment (automotive vehicles in the longer term), and MCFC and SOFC are targeted for stationary power appins.