These islands are shown in Fig1. Phangan island is located in Suratthani province, and is famous for the full moon party. Each year a lot of tourists visit it, and the demand of electricity is increasing. A 33 kV power cable connects Phangan to Samui to supply electricity to this community. In the future a wind turbine installation could be the response to further increases in demand, so an assessment of wind energy potential is motivated.