It's being developed in England now. The whole structure will be nearly 1,000 feet tall.
When it comes to wind turbines, bigger is generally better. , and taller structures are cheaper to construct and maintain than several smaller ones with the same output. That's why turbines have been growing steadily in the last 20 years: from minnows the size of Dutch windmills, to modern engineering feats half the height of the Empire State Building.
The latest milestone comes from the U.K., which is investing heavily in offshore wind, and has the most capacity in the world. A British company, called Blade Dynamics, recently announced it was developing blades of up to 100 meters in length (that's more than 300 feet)--dwarfing the size of existing technology in the 60-meter range. Sitting on top of a tower 170 meters high, the structure will be 270 meters in all, or 885 feet. That's about one-sixth of a mile.
http://www.fastcoexist.com/1681150/the-worlds-biggest-wind-turbine-has
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