Abstract: A Hydraulic Gravity Harvester is disclosed; having a plural of slip buckets, each slip bucket has a piston that works with a valve that is connected to the lower end of each piston; each slip bucket reciprocates vertically within a cylinder. When the valve is in the closed position and the slip bucket is on the down stroke, it creates a positive pressure in the cylinder pushing fluid up to a reservoir positioned high above the slip buckets. Each slip bucket on the down stroke is connected so that the opposite valve is in the open position and on the up stroke, so the weight of the fluid that has pushed this slip bucket down now rest on the bottom of the cylinder. This allows the slip bucket that is on the down stroke to turn a shaft creating a rotational torque.