A damless hydroelectric power plant can be used in installations for converting the kinetic energy of a gravity flow of water into electrical energy. A part of the housing of the hydroelectric power plant, in which an impeller wheel is arranged, is in the form of an annular tunnel. Supporting annular runners on which the impeller wheel is supported are fixed in a plurality of rows on vertical struts of the tunnel inside the latter on both sides. The annular structure of the tunnel is connected to a central hub by tie rods and to containers, some of which contain a constant volume of air, while others contain an adjustable volume of air. In each wheel sector, the impeller wheel contains: a plurality of rows of roller supports, which are fixed on the vertical struts on the external sides of an outer and an inner wheel rim, said roller supports having horizontal and vertical axes of rotation and being equipped with springs, by means of which the wheel interacts with the supporting annular runners of the tunnel; and also toothed sectors, which are fixed on each wheel sector on vertical struts of the outer wheel rim, are arranged in a plurality of rows and are used, upon rotation of the impeller wheel, to pull chains which are kinematically connected to a revolution multiplier and to an electrical energy generator.
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