Abstract: A power generating system including a movable tank filled configured to move vertically, a piston driven by the movable tank via a piston rod, a first cylinder filled with the liquid, and connected to the piston at a top end and a turbine at a bottom end, wherein the piston reciprocates in the first cylinder pushing the liquid from the first cylinder into the turbine causing the turbine to rotate and produce power, and a stationary tank connected to an outlet of the turbine. The system further includes a second cylinder connected to the movable tank and the first cylinder, and a balloon filled with gas connected to a top portion of the movable tank, wherein the balloon lifts the movable tank from a bottom position to a top position when the movable tank is empty.