The invention relates to a device for converting wind energy into electrical energy. The device is comprised of four legs. One of the legs of the frame has an external recess for mounting on a roof ridge. The frame has a horizontally positioned rotor with a hub and at least two vanes and a generator functionally coupled to the rotor arranged in a central area of the opening formed by the frame. The axis of rotation of the rotor is perpendicular to a plane extending through the legs of the frame.