HYDROGEN PRODUCING SYSTEM, HYDROGEN PRODUCING METHOD

An object of the present disclosure is to provide a technique capable of effectively suppressing deterioration of a water electrolysis stack even when a defective stack occurs in a hydrogen producing system for producing hydrogen using a plurality of water electrolysis stacks. The hydrogen producing system according to the present disclosure controls a distribution of electric power to a serial unit of each of water electrolysis stacks based on a predicted degradation of a plurality of water electrolysis stacks calculated based on a location of a defective stack and degradation characteristics indicating susceptibility for degradation of the water electrolysis stack