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Transcripción del abstract original del autor: Polymer Electrolyte Fuel Cell (PEFC) has characteristics such as co-generation (co-gen) capability, high efficiency even in small scale and even in partial load, low emission of NOx, SOx and CO2 and so on. Therefore PEFC is expected to be suitable for a residential co-gen system. Counting on them, Tokyo Gas is conducting R&D on natural gas fuelled PEFC co-generation system (co-gen) aiming the commercialization especially for a residential application. Our activities are mainly focused on following items; 1) establishment of optimum specification of PEFC co-gen based on market requirements and technical perspectives, 2) R&D relating to fuel processor, optimum operation method, heat utilization etc. and 3) evaluation through operation tests and field trials.