A water power generator for generating electrical energy from a moving body of water comprising structural means interposed in the path of water flow. The structural means includes at least one side wall which is longitudinally curved from a diverting point at the outer end thereof to a gradually flattened curve at the inner end thereof. The wall is transversely curved from a generally planar surface at the outer end thereof to a curvature approaching circular at the inner end thereof. Cowling means is positioned at the inner end of the side wall, and turbine generator means is located at the outer end of said cowling means. In certain forms of the invention, two or more longitudinally and transversely curved side walls are provided, each having an associated cowling and turbine generator. The invention is adaptable to wave action, tidal action and river current environments.