The 240m tall twin towers are the first to focus their design around wind turbines. The three 29m-diameter turbines should produce 1,100 to 1,300 MWh per year, reducing power use in the towers by 11% to 15%, according to architect and designer for the building, Atkins.
The sail-shaped towers funnel the prevailing winds between them and over the three turbines. Power across the three turbines is balanced by the tapering of the towers. As wind speed increases with height, the buildings thin correspondingly, reducing the funnelling effect and keeping the wind speed constant.