A <a href="https://en.wikipedia.org/wiki/Quietrevolution_wind_turbine" class="extiw" title="en:Quietrevolution wind turbine">Quietrevolution wind turbine</a> <a href="https://en.wikipedia.org/wiki/Gorlov_helical_turbine" class="extiw" title="en:Gorlov helical turbine">Gorlov type</a> vertical axis wind turbine installed on the roof of <a href="https://en.wikipedia.org/wiki/Colston_Hall" class="extiw" title="en:Colston Hall">Colston Hall</a> in Bristol, England. Measuring 3 m in diameter and 5 m high, it has a nameplate rating of 6.5 kW.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/87547772@N00">Anders Sandberg</a> from Oxford, UK
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/87547772@N00/3513051949/">Vertical axis wind turbine</a>