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http://www.bbc.co.uk/blogs/newsnight/2006/11/are_domestic_wind_turbines_an_ecocon.html
http://www.timhunkin.com/a125_arch-windpower.htm
Power in watts = (collection area in square feet) x (wind speed)³ x (0.0054)
The problem with domestic turbines lies in that little cube function on the wind speed.
http://www.timhunkin.com/a125_arch-windpower.htm
...I went down to our local harbour and was amazed to see some of the yacht turbines spinning with hardly any wind - but then I saw that many others weren't, and realised that the ones that were cheerfully spinning weren't charging, they just hadn't been left connected to anything. I guess that large windmills (which keep their speed roughly constant by adjusting the pitch angle of the blades) are also often turning without generating. I started to wonder if there was less power in the wind than I had intuitively imagined...