PTC = Production Tax Credit

http://www.ucsusa.org/clean_energy/clean_energy_policies/production-tax-credit-for-renewable-energy. html

I note that the USA PTC is not available to residential producers, coupled with your note about no evidence of economy of scale it might be something that can be improved upon?

What is the regulatory framework currently in France?

I've read EDF currently has to buy offshore wind kWh at 0.13 euros and onshore wind kWh at 0.082 euros for the first ten years (lower after that).