The COREPAC project deals with the realisation of a cogeneration system operating on natural gas and PEM (Proton Exchange Membrane) fuel cell technology and a reformer. This system was developed with the aim of supplying electrical and thermal energy of 4.6 kWe and 10 kWth respectively in residential community applications. More than 1000 hrs operation winter / summer in standby mode 350 hrs in connected stack operation 157 stops / starts No loss of performance