NOVELTY - The system (1) has a control unit i.e. transformation installation (4), for setting transmission electric power to make constant based on an electric power generation pattern, which shows transition of electric power generated by a wind power generator (2) such that water is stably pumped up with fixed electric power based on the electric power generation pattern. Electric power for power transmission and pumping-up water power generation electric power are added to set the pumping-up water power generation electric power in each time as the transmission electric power.    USE - Aquatic electric power generation system for facilitating wind power generation and pumping-up water power generation in marine e.g. sea and ocean, lake and marshes.    ADVANTAGE - The system utilizes a water-storage tank formed in a water bottom underground as a lower pool without providing a water tank in upper direction, so that capacity of an upper pool can be bulged and large-scale pumping-up water power generation can be performed without providing a high capacity water tank, thus reducing installation expense of the system. The system allows combination of the electric power except the electric power required for pumping from the electric power electric-power-generated by the wind power generator and the electric power by a pumping-up water power generation apparatus to be transmitted outside as the transmission electric power, so that the electric power electric-power generated by the wind power generator can be utilized effective in a pumping and external power transmission, thus exploiting natural energy and renewable energy effectively, transmitting stable electric power at external and an electric power system and inhibiting influence on an electric power system.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an aquatic electric power generation system.    Aquatic electric power generation system (1)    Wind power generator (2)    Transformation installation (4)    Wind mill (21)    Wind-powered generator (22)