http://www.fwi.co.uk/Articles/30/09/2009/118121/Vertical-axis-wind-turbine-makes-sense-for-Lincs-farmer.htm  

SUPERBULL AG SUPERBULL GREEN POWER GmbH Germany becomes a pioneer – the biggest wind farm using vertical wind turbines has been created! In January 2011 SUPERBULL AG’s plan  to build a wind farm in the Ühlingen district of Ühlingen – Birkendorf using vertical turbines from UK firm BIOTEC INTERNATIONAL , came to fruition.