Technologies

We are currently developing small butterfly windmills that are economical to build across wide regions of Japan.
To achieve our aim of developing a miniature wind turbine that will transform Japan's renewable energy map, we must make our turbines sufficiently economical even in regular regions without strong wind.
Specifically, we are developing turbines that can provide power for a cost of 10 yen/kWh given a mean windspeed of 3.5 m/s.
The core technical innovation is a mechanism that passively tilts wings to use them as an aerobrake during strong wind, thus preventing excessive rotation. Not only does this eliminate the need for braking systems, which require electrical input for disc brakes and the like, but this also suppresses maximum output and saves cost on electrical components by adopting a relatively small generator for such large wings.

See video