A wave energy conversion system comprising: a buoy anchored to a seabed and having a piston slidable within a chamber to pump the sea water into the chamber; and a power generator located ashore for receiving the sea water from the buoy via at least one pipe member, wherein the generator has a high pressure accumulator which is configured to maintain the sea water at a first constant pressure that can be utilized to generate power in a high pressure generator and a low pressure accumulator which is configured to maintain the sea water which undergoes a pressure drop after used in the high pressure generator at a second constant pressure that can be utilized to generate power at a low pressure generator.