OIS offshore Industrie Service GmbH, together with Green Wind Offshore GmbH (as ARGE O&M Project DolWin3), was contracted to provide maintenance services for GE Grid GmbH’s DolWin3 grid access system. The contract included a multi-month preparation phase and a five-year maintenance phase and covered maintenance planning, organisation and implementation for the offshore conversion station DolWin gamma and for the onshore station at Dörpen West.