The solution relates to an underground pumped storage power plant, where the working water medium is led by a supply pipe (6) to the working space in the engine room hall (7), in which the unit of the pumped Francis turbine (10) is located, while on the engine room hall (7) connects the waste pipe (30) leading to the connecting tunnel (32) leading to the individual fields (33) of the underground tank (34), this tunnel (32) is connected to the surface atmosphere by ventilation shafts (35), while the engine room hall (7) is further connected by a corridor (38) with the hall of the transformer station (31) with transformers (37), where an access tunnel (39) connecting the engine room (7) and the transformer station (31) is connected to the hall of the transformer station (31), which is brought to the surface in the opposite direction. the space of the chess tower (40), the corridor (38) being extended to the connecting tunnel (32) by an access corridor (41), so that the engine room hall (7) is connected by this access corridor (41) and the rising ventilation shaft (35) adjoining it. with ventilation object (3 6).
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