A fuel cell is a device in which the electrical energy of reactants is converted with high efficiency to usable energy in the form of electricity and heat. Fuel cell energy systems are being considered for a number of utility applications. Broadly speaking, early fuel cell utility application opportunities can be classified into two formats. The first is as a dispersed generator for gas/electric utilities, where fuel cell power plants are placed either placed within a utility service area or in remote sites. The second is as an on-site integrated energy system at a load centre or point of energy use. Used in these applications, fuel cell power plants permit utilities to add capacity in many critical areas within their system. Also, they can utilize unavailable site locations reducing electrical transmission costs and improving the fuel utilization and economics of the overall system.