Output power in photovoltaic systems changes steeply with the change of the solar radiation intensity. The change of the output power has influence on the electric power quality of the system. This paper proposes a residential distributed-generating system with solar cells and fuel cells. In order to smooth the output power which changes steeply the fuel cells are connected to the PV system in parallel. Thus the generated power of all the system can be smoothed. However, the steep changes of the electric power generated in the PV system can not be smoothed. The electric energy storage system with the EDLC is connected in parallel with the PV and FC systems. It is confirmed by the simulation that the proposed distributed-generating system is available for a residential supply. Provided that the proposed system is introduced in 2020, the cost of the proposed system is compared to that of the present system.