A system for generation of electric power on-board a motor vehicle of the type that includes a fuel cell, a reformer for supplying the fuel cell with hydrogen-rich gas, an air-compression device, and a control unit used to control the operation of the reformer. The reformer includes a main cold-plasma reformer and an auxiliary cold-plasma reformer that are mounted in parallel upstream of the fuel cell. In addition, a control valve, which is controlled by the control unit, is mounted upstream of the two cold-plasma reformers to supply compressed air, fuel, and water vapor either to the main reformer alone or to both reformers simultaneously.
