Orthogonal windmills and hydro units of big capacity and high power efficiency are offered. The units can have rather great individual capacity and at the solution of many technical problems should provide high efficiency of power. The paper draws attention to the fact that the actual efficiency of the aggregates significantly depends on their design and can considerably differ from the given estimates. In orthogonal power installations, at which diameter of the route of movement of blades much more than their height (length), the flow speed before the rear blades may be the same as in front of unit. The test and calculations confirm it. The system proposed in this paper has the high efficiency of converting wind or water flow energy, that achieved by turbulent transport of current energy in the vertical direction and the restoration due to this velocity field in front of the back action of the blades.