An apparatus for deriving energy from the rise and fall of a body of fluid consisting of a float adapted to move substantially in a vertical plane in response to the rise and fall of the body of liquid. A cylinder having a piston therewithin adapted for vertical movement relative to the cylinder in response to rise and fall of the float with the body of water, in a manner to apply force to fluid in a chamber of the cylinder, the force being applied alternately to opposed chambers of the cylinder, means for converting force applied to the fluid to energy, and means responsive to energy demand for storing energy converted from force applied to the fluid and for converting stored energy to force applied to the fluid.
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