"Home wind turbines are significantly underperforming and in the worst
cases generating less than the electricity needed to power a single
lightbulb, according to the biggest study of its kind carried out in
Britain.

An interim report revealed that homeowners could be being misled by
the official figures for wind speeds because they are consistently
overestimating how much wind there is - sometimes finding that real
speeds are only one third of those forecast. In the worst case
scenario, the figures indicate that it would take more than 15 years
to generate enough 'clean' energy to compensate for the manufacture of
the turbine in the first place":

http://www.guardian.co.uk/environmen...ernativeenergy