Disclosed is a device for harvesting energy from an air current, the device comprising: a) one or more wind turbines, each wind turbine comprising a vane assembly rotatably mounted on a shaft, the vane assembly comprising a plurality of vanes; and b) an aerodynamic deflector mounted over the one or more turbines, the deflector comprising an opening associated with each wind turbine; wherein the deflector shields the vane assembly from upwind drag, and the opening channels the air current onto a portion of the vane assembly. The deflector can further comprise a plurality of photovoltaic solar cells for harvesting solar energy. Similarly, each of the plurality of vanes can comprise one or more photovoltaic solar cells for harvesting solar energy. The device can be mounted on a mobile body or stationary body. The vane assembly can be mounted on a horizontal shaft or vertical shaft.