years have to be found. Here, AEP plays an important role for the
calculation of the achievable revenues and a fraction of the variable
costs. To complete the estimation of cash flow, the initial costs are
determined as relation to the considered design properties with the
help of a mass-cost- model. Thirdly, the required costs of equity are
estimated by Capital Asset Pricing Model (CAPM). Now, NPV can be
calculated for different combinations of rotor diameter, rated power
and hub height of the turbine, where cash flow varies in
dependence of turbine properties. In doing so, economically
optimal properties of the turbine are identified by maximizing NPV.