NOVELTY - The apparatus (10) has power generating unit (12) with pressure generating container (16) and energy generating cylinder (18). A liquid-pumping unit (14) is designed such that stroke (22) of upper horizontal and lower vertical cylinders (30,32) is effected by drive device, and lower cylinder return into starting position for new pumping carriage is effected by variable float (34). The float is connectable to lower cylinder. The shape and size of floats are altered, so that lower cylinder raise to starting position for new liquid-pumping operation is realized by small external energy.    USE - Power generating apparatus installed in enclosed building, for generating energy by hydrostatic pressure in fluid.    ADVANTAGE - The generation of energy is performed efficiently by utilizing the hydrostatic pressure of the natural ground load in fluid, and generation of kinetic energy is realized by smallest possible external supply of energy and continuous cyclic flow of process is maintained. The power generation apparatus is environment friendly, while easily maintaining power generation apparatus.    DETAILED DESCRIPTION - The upper horizontal cylinder and lower vertical cylinder are connected to each other by connecting element. An outlet (24) for a discharge of a quantity of fluid from the power generation unit present in liquid pumping unit is provided between power generation unit and fluid pumping unit. An overflow portion (38) for re-introduction of quantity of liquid from liquid pumping unit is present in power generation unit. An INDEPENDENT CLAIM is included for power generation method.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the power generation apparatus.    Power generation apparatus (10)    Power generation unit (12)    Liquid-pumping unit (14)    Pressure generating container (16)    Energy generating cylinder (18)    Stroke of upper and lower cylinders (22)    Outlet (24)    Upper and vertical cylinders (30,32)    Variable float (34)    Overflow portion (38)