~1.~1.4The Kanev pumped.storage station (PSS), equipped with large mixed-flow reversible units for heads up to 112 m, is regarded as the source of peak-load energy and load regulator in the southern power system with daily and weekly cycles of regulation and operating time up to 9 h in a turbine regime and 7 h in a pump regime. The PSS is being constructed near the Kanev hydroelectric station with the use of its reservoir as the downstream storage reservoir. The upper storage reservoir and powerhouse of the PSS are being constructed under complex geological conditions on soft ground, which predetermined the need to find layout designs eliminating or reducing undercutting of the load-bearing slopes. Such a design was provided by locating the powerhouse of the PSS in drop shafts, which in turn required the development of a nonstandard waterway of the pump-turbine and dimensions of the concrete drop shaft (Fig. 1).