Abstract: A generating breakwater has a pressure duct of steel plate, with a closed upstream end and a turbine and generator at the downstream end. In use it is anchored via cables to face obliquely into the direction W of incident waves. Along the length of the duct are arrayed wave collectors, which face obliquely with respect to the length of the duct, whereby the length of upstream sides of the collector to upstream ends of bends is greater than downstream sides, the bends connecting the trumpets to the duct. The sides are interconnected, one downstream one to the next to upstream one along the length of the device. The bends are narrower at their upstream ends than the mouths of the collectors, giving the latter a tapered shape in plan.