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Fuel cell development at United Technologies Corporation has pioneered the successful application of fuel cell power plants for space craft electrical power and for stationary electric generation in building applications. A major effort is now underway to utilize proprietary Proton Exchange Membrane (PEM) fuel cell stack technology and fuel processing technology in power plants designed for application to vehicles. This activity is carried out at International Fuel Cells, LLC which was formed by United Technologies specifically to pursue transportation applications of its fuel cell technology. This paper reports on the status of development and demonstration activities for automobile and bus applications. A 100 kW, methanol-fueled power plant is providing power for operation of a 18 meter transit bus. This 1727 Kg power plant has achieved impressive efficiency, response and emission characteristics in testing to date.