Presentations

Abstract

This study investigates the potential for extending the operation of existing offshore wind farms (OWFs) beyond their original operational periods, focusing on the DolWin cluster and its associated offshore grid connection systems. The research investigates various scenarios for extended operation versus decommissioning followed by new installations with higher-rated wind turbines, emphasizing practical implications. Five distinct scenarios are evaluated, ranging from the earliest possible decommissioning to a general extension of each OWF’s operational period by up to 10 years. Extensive modeling studies were conducted to estimate expected energy yields, including wake effects, and offshore logistics during operation, decommissioning, and new installation phases. Failure rates of turbines and grid connection systems, and the related operation and maintenance (O&M) activities during operation are modelled in a time-discrete simulation. The economic evaluation utilizes a cost index that compares energy yields against  O&M costs and expenses for decommissioning and new installation expenses. The findings indicate that extended operation can yield economically favorable energy outputs, particularly when coordinated efficiently within the DolWin cluster. The study highlights the trade-offs involved, including the potential costs of new installations and ecosystem impacts. Ultimately, the research contributes valuable insights into the feasibility of extending offshore wind farm operations, providing a framework for decision-making in the industry.