Now this is different! A three blade vertical offshore wind turbine combined with an underwater current turbine. It’ll be tested soon in Japan. This isn’t wave or tidal power, it’s current power. Has this ever be done before? Plus, the underwater turbine can power the wind turbine.
Combining a three-bladed Darrieus turbine on top, a Savonius turbine underneath, and a generator in between, the SKWID power generation concept is claimed to be the world’s first hybrid system “capable of maximizing the harvesting of ocean energy from wind and current“.