Abstract: The present invention relates to an energy system and method suitable for converting wave energy of a body of water into movement of a drive train to capture energy comprising a vessel sitting on said body of water having a hull (1) adapted to roll freely in response to said wave energy; and a plurality of inclined channels (4) mounted within and/or on the hull (1) that are positioned to convert the rolling motion of the hull to vertical displacement of water, such that said vertical displacement of water can then be allowed flow under gravity through a conversion capture system (9) to capture energy. The invention provides a valve-less water elevation energy system. The invention also provides a mooring system (15) suitable for connecting the vessel with an anchor, the mooring system adapted to facilitate unhindered rolling motion of the vessel and maximise energy capture.