NOVELTY - The station (6) has a pressure tank (20) comprising a water outlet, and a pump for pumping out water from the tank into surrounding sea against hydrostatic water pressure. The pump converts electrical power into potential energy when the water is pumped out into the sea. The tank comprises a water inlet, and a generator inflows the water from the sea into the tank and converts the potential energy into the electrical power during inflow of the water. Electric lines (4, 12) transport the electrical power from a surface of the sea to the tank and from the tank to the surface, respectively.    USE - Underwater pumped-storage power station for temporary, reversible storage of energy i.e. intermittently available time fluctuating energy, from a primary power plant e.g. wind power plant and photovoltaic plant, of a power supply network (all claimed) that is utilized for supplying power to a consumer i.e. building.    ADVANTAGE - The pump converts the electrical power into the potential energy when the water is pumped out into the sea, and the generator converts the potential energy into the electrical power during inflow of the water, thus reducing power dissipations in the power station, and hence enabling the station to store large amount of energy without loading a landscape. The station stores the scalable amount of the energy. The pressure tank is designed in pressure-resistant ball-, oval- or torus shape, thus enabling large mass storage of energy in the station.    DETAILED DESCRIPTION - The pressure tank is provided with an outer wall that is made of steel or reinforced concrete and designed in pressure-resistant ball, oval or torus shape. The pump and the generator are designed as a common pumping turbine. INDEPENDENT CLAIMS are also included for the following:    (1) a power supply network    (2) a method for temporary, reversible storing of intermittently available energy from a primary power plant.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an underwater pump-storage power station for a wind-power plant and a consumer.'(Drawing includes non-English language text)'    Water depth (T)    Wind power plant (2)    Electric lines (4, 12)    Underwater pump-storage power station (6)    Pressure tank (20)