Leviathan Energy has completed initial testing on their Wind Energizer unit and is reporting gains in wind turbine output in the ballpark of 30% - and as much as 150% at lower wind speeds. The idea is that by placing site-specific structures at the bases of the turbines you can shape the flow of air in the vicinity of the turbine so that the highest velocities get targeted at the blades. Leviathan's early testing has been conducted on a relatively small scale, using commercially-available small turbines with 3-meter blades but they are planning on exploring opportunities for third-party testing and certification on a commercial scale wind farm. Cleantech's original post.