Current State and Topics of New Energy Sources 9. Other Renewable Energies - 1 Development and use of other forms of renewable energy are underway, including undertakings with seawater energy, geothermal energy, small hydroelectric plants and biomass energy. Power is generated by turning a turbine with air pushed by the undulating motion of waves. A working type is used to power a small channel marker buoy. At present, research and development is underway on a 1 - 130 kW class system and some systems have successfully connected to the commercial power grid.
Power is generated using the forces of low and high tide.
However, there is little height difference between high and low tide in Japan, so the concept is not economically viable. MOT pamphlet Fig.