A power generation device for a vehicle comprises a housing adapted to removably affix to a rear of a vehicle and a rotatable support member for rotatably supporting a first device, the rotatable support member operatively connected to the housing, wherein the first device includes rotor blades for producing electrical energy when exposed to a flow of air. Further, the rotatable support member is adapted to be articulated between a range from a first position, wherein the rotatable support member and the rotor blades of the first device are disposed within the housing, and a second position, wherein the rotatable support member and the rotor blades of the first device are disposed outside of the housing.