investment costs are still high and need to be subsidized by the adder system, but in future the cost will come down and allow suitable prices for electricity production. Small scale systems need high financial support as their electricity production cost may reach 0.46 Euro per kWh. At sites with good direct solar irradiation conditions and 5 MW size of the turbines minimum, the price per kWh may drop from 0.11 to 0.19 Euro today to 0.05 to 0.08 Euro in 2020.