For the German energy transition, offshore wind energy is a significant factor of success. The number of installed offshore wind energy turbines is steadily increasing. Currently, the subject matter of offshore wind energy turbine maintenance and its optimization is increasingly in the focus of research and development work. The present contribution examines the logistics of offshore wind energy turbine maintenance and the impact of the actual sea state and of sea state forecasts. To this end, the coordination processes between the players involved in the planning of service operations will be presented and analysed. Based on this, the impact of the quality of wave height forecasts on operation decisions and the mean time to repair will be determined as well as the availability of the turbines at different forecast quality levels. Proceeding on the basis of these results, the concept of a decision-making support system for operative logistics planning will be presented.

Abstract
1. Introduction
2. Maintenance and logistics of offshore wind energyturbines
3. Research approach
4. Previous scientific studies of operativemaintenance logistics
5. Process of operative maintenance logistics
6. Simulation study
7. Concept of a decision-making support system foroperative logistics planning
8. Conclusion
Reference

• Thies BEINKE(BIBA - Bremer Institut für Produktion und Logistik GmbH at the University of Bremen, Bremen) Corresponding Author
• Moritz QUANDT(BIBA - Bremer Institut für Produktion und Logistik GmbH at the University of Bremen)
• Abderrahim AIT ALLA(BIBA - Bremer Institut für Produktion und Logistik GmbH at the University of Bremen)
• Michael FREITAG(Bremer Institut für Produktion und Logistik GmbH at the University of Bremen and Faculty of Production Engineering, University of Bremen)
• Thomas RIEGER(cluetec GmbH, Karlsruhe)