At first glance their claims seem to break the laws of physics. The turbines generate more power than there is available in the wind for the (estimated) swept area. Not a good sign.

Also are you based in France? They seem to only want to lease machines in some sort of special deal hooked up with EDF (similar to the rash of 'free' PV roof-rental schemes now appearing in the UK) but where you have to pay a huge deposit up-front (supposedly funded by a grant from the French government).

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ted