The topic of this study is the implementation of super capacitors in a fuel cell electric vehicle. The problem statement is to design a power controller for controlling the mean fuel cell power output. The designed controller is able to accomplish this task under any operation condition imposed by the electric motor, which is regarded as a disturbance to the system. It does so by controlling the DC-bus voltage, which is tied to thefuel cell voltage in the parallel DC-bus. Thus by controlling the DC-bus, the fuel cell voltage and power in extension, is controlled. Feedforward disturbance rejection is used to enhance the disturbance rejection capabilities of the DC-bus voltage controller. The result is that giving a 0-270 W motor power step the DC-bus voltage is only perturbed with a 0.1 to 0.5 V voltage ripple. The mean output power is within 10% of the wanted power value.