The WET-NZ makes maximal use of the device’s wetted surfaces to transfer wave forces to the structure, operating in heave motion similarly to other point absorber technologies, as well as capturing surge and pitch energy through the horizontal motion of the reactive hull and the active float.
Once the device is deployed, ballast tanks in the hull are flooded with seawater to increase its mass so that it does not move vertically to track the wave profile; as a result, the device can still capture surge and pitch motions of the wave.
The Active Float pivots about a single axel between the hull and the power pod at the waterline. Excited by both vertical and horizontal motions of the waves, the active float rotates about the pivot to create relative motion between the two parts. By opposing this differential movement, additional energy is extracted.