The Wave Dragon is a floating overtopping device designed for water depths of 20 m and deeper.
- The central, front face of the device is a doubly-curved ramp, up which incoming waves surge (as on a beach).
- Behind the crest of the ramp lies a reservoir that gathers the water that overtops the ramp.
- Energy is extracted as the water captured in the reservoir is allowed to drain back to the sea through a number of low-head hydro turbines located within the reservoir.
- The amount of energy captured by the device is increased by long reflector wings mounted either side of the reservoir, which channel the waves towards the central ramp.
- The device is slack moored for and aft to allow it to turn into the principal wave direction.
Wave Dragon plants are designed to be inspected and maintained at sea. Having multiple turbines and generators means that each has a lower weight, which permits easier removal and installation during operation. In addition, this provides multiple redundancy, so maintenance and repair can be carried out without loss of output.
The Wave Dragon comes in 4 sizes:
- 1.5MW device. Yearly power production up to 4 GWh. Device width: 152 m
- 4MW device. Yearly power production up to 12 GWh. Device width: 230 m
- 7MW device. Yearly power production up to 20 GWh. Device width: 270 m
- 12MW device. Yearly power production up to 35 GWh. Device width: 320 m