Wind turbines continue to get larger and heavier and, thus, place new demands on materials and construction. In order to prove the technical reliability of these turbines, special testing procedures and simulation methods are being developed. For example, the stability and structural dynamics of rotor blades and supporting structures are being examined. In the sector of offshore wind power, experts carry out site investigations and aeroelastic simulations in order to define the overall dynamic of the offshore wind turbine in combination with factors such as wind, sea condition and subsoil. Moreover, the Fraunhofer Energy Alliance develops strategies and technologies for maintenance and offers comprehensive services for the management and grid integration of wind turbines.