NOVELTY - The power generating apparatus has a water tank (2) and a vacuum tank (3) provided on upper portion of pressurization water tank (1). A vacuum tank (6) is provided in the upper portion of precipitation tank (5). A feed water tank (8) is positioned outer side of precipitation tank for controlling the water level in precipitation tank. A feed water tank (9) is positioned outer side of pressurization water tank for controlling water level in the pressurization water tank.    USE - Circulating-type electric power generating apparatus.    ADVANTAGE - The water in the apparatus can be circulated continuously without using motive power and the electric power is generated reliably. The environment pollution is prevented, since the waste heat discharged by the cooling of air conditioning facility, clean room, etc., can be utilized for electric power generation. The penetration of refuse into the electric power generating apparatus can be prevented and the water quality management can be excluded. The aeration of nitrogen gas into the water is performed, so that the oxygen amount in the water is decreased and the reproduction of micro-organisms in water is suppressed.    DETAILED DESCRIPTION - The vacuum tank (3) is provided with a riser tube (21) connected to the vacuum tank (4), after attaching the shut-off valve (8a). A pipe (24) linked to vacuum tube (6) is connected to vacuum tank (7), after attaching shut-off valve (10a). A pipe (22) linked to vacuum tank (4) and extended in parallel for connecting with a vacuum tank (7), after attaching shut-off valve (9a). A water inlet tube is linked to the lower portion of precipitation tank and connected to the pressurization tank, after attaching the shut-off valve (7a) and water turbine.    DESCRIPTION OF DRAWING(S) - The drawing shows an explanatory view explaining the circulation of water in the apparatus.    Pressurization water tank (1)    Water tank (2)    Vacuum tanks (3,4,6,7)    Shut-off valves (3a-10a)    Precipitation tank (5)    Feed water tanks (8,9)    Riser tubes (19-21)    Pipes (22,24,25)