PURPOSE:To effectively utilize the excessive energy stored at night when the electric power demand is little, in the daytime, by installing a storing device for the warm sea water having the higher water level than the sea water level, pump for pumping up the sea water into the storing device, and a water wheel driven by the stored warm sea water. CONSTITUTION:The heating medium such as ammonia is evaporated by the heat of the warm sea water in an evaporator 2. The warm sea water is pumped up from an ocean surface layer by a warm ocean water pump 3, and after the ammonia is temperature-raised and evaporated, it is returned into the ocean. After the gas/liquid separation by a separator 4, the ammonia vapor is supplied into a turbine 5, which is driven, and then the ammonia vapor is cooled by the cold sea water, and condensed. While, the sea water is pumped and stored in a storing device 13 by a water pump 12 driven by a motor 17 by utilizing the electric power which becomes excessive at night, etc., when the electric power demand is little. The warm sea water in a storing device 13 is introduced into a water wheel 14 in the daytime, etc., when the electric power demand is much, and the water wheel 14 is revolved to drive a cold sea water pump 8, and the cold sea water is allowed to circulate through the condenser 7.
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