Building-Integrated Wind Turbines
Blue Green Pacific is a renewable energy company that's working towards making microwind energy generation ubiqitous in the urban environment.
As an intial step, they've installed a small Windside turbine on a San Francisco residence. This is the first residental wind turbine installed in the city.
The heavily monitored, seashell shaped turbine is nearly silent, aesthetically unobtrusive, and does well in turbulent, shifty wind environments - all crucial in an urban setting.
It's a great first step in a promising direction. Blue Green Pacific will be collecting data on the turbine's performance to ensure that the economics are compelling. Let a thousand little wind machines bloom!
On a whole different scale, the recently announced "Zero Energy High Rise" in Guandong, China is also an exciting project aiming to bring renewable energy generation to high-density urban setting. The project, commissioned by the Guandong Tobacco Company (!?!) for their headquarters, will supposedly require no net energy to operate due to advanced energy efficiency features, integrated wind turbines, and PV. Hopefully, it will come to pass as envisioned by the architects.
One of the most intriguing possibilities that Building Integrated Wind Turbines (or BIWT) allow is the use of the structure's architecture to accelerate wind flow around and through buildings, and thence into the turbines, improving their performance. Conversely, wind machines could be used to absorb energy from the wind, in effect providing a mechanical shelter belt or wind break in areas where trees - used for millenia in this role - are impractical.