Das Projekt "Wind Turbine in Icing Environment: Improvement of Tools for Sitting, Certification and Operation" wird vom Umweltbundesamt gefördert und von Universität Kassel, Institut für Solare Energieversorgungstechnik e.V, Standort Kassel durchgeführt. Improvement of tools and knowledge suitable for manufacturers, operators, developers and consultants to exploit wind energy utilization in ice-endangered and cold climate environment. The detailed objectives are: A. Improved formulas to predict ice accretion from meteorological parameters available; B. New icing map for entire Europe including number of icing days, distribution of intensity of icing, expected ice loads due to in-cloud icing; C. Statistics and correlations on wind speed, temperature and solar radiation over Europe; D. Effects of icing on power production and environmental safety for stall and pitch regulated turbines under different icing conditions in Europe; E. Analyses of operation of 'standard' and 'arctic' wind turbines located at harsh conditions in Europe; F. Specifications for wind turbines and their components for harsh climates; G. Improved safety; H. Market study for 'arctic' wind turbines.