Abstract: A vertical-axis wind turbine installed at the top of a hillock, in a crater, is constituted of a turbine, a buoy and a cylindrical shape foundation carried over two floors, and comprising a basin located across the higher floor and an alternator room located underground. One or more rotors are suspended from the turbine but the weight thereof supported by water in the basin. The turbine has a roof in the form of a plane wing (Naca), a collecting section having a number of blades spread over all the circumference of the section leaving a series of openings by which the air strikes each blade, and a floor which receives the blades, level with the top of the hillock. A buoy wherein the water supports the weight of the turbine and rotor creates a state of weightlessness. By violent winds, the buoy may be filled with water to create inertia and the water in the basin be lowered by gravity, into an adjacent tank, to bury the turbine within the crater.