Design and selection analysis of suitable offshore wind turbine supporting structure for Selayar Islands

The offshore wind turbine (OWT) structures are rapidly developing to reach net zero emission by 2050. Some structure designs already exist for specific overseas waters. Several practical recommendations and the structure conditions may not directly apply to using these structures for the Indonesian seas. This is due to the site-specific characteristics for the design of each offshore structure. A selection analysis is needed to select the most suitable structure type of offshore wind turbine to be operated on the Indonesian seas. This research evaluated three existing types of OWT, namely monopile, tripod, and jacket, which were designed for the Gulf of Mexico waters. This study used the analytical hierarchy process (AHP) method to select the most suitable supporting structure for wind turbines installed in Indonesian waters. Selayar Islands waters are chosen for a study case due to the promising potential wind energy in that area. The development process of multi-criteria decision-making using the AHP was by considering some crucial parameters that dictated the structures' performance, such as structural aspects, power generation performance, and system cost, including CAPEX (Capital Expenditure) and OPEX (Operational Expenditure). This study could be considered pre-feasibility because it only used secondary data and brief analysis related to the general performance of the selected structure. The analysis found that the jacket type was chosen as the most appropriate one for operation at Selayar Islands waters among three alternative structures.