On Phangan island, most of the area is mountainous in the range of 100-638 meters from the sea level,
with highly rough terrain. Requiring smooth terrain for the installation of a 120 tower, with a radius of at
least 40 m for the guy cables, left only few options. The northeastern part of Phangan island belongs to a
national park, so the area of Phangan subdistrict organization was selected because it satisfied the
requirements and was free of charge. The 120m guy mast’s triangle tower (Figure 2.) was installed at the
UTM coordinate position of x609107 and y1077433. For an assessment of wind energy potential, the
wind speed was measured at 5 heights(65,90,100,110 and 120 m) using anemometers, and the wind
direction at 100 and 120 m heights were measured with NRG 200P wind vanes. Data were collected
every 1 minutes by Nomad II data logger, during December2011–November 2012. The 12 V DC battery
for the data logger was charged by solar cells at 10 m height. The relative humidity, temperature and
pressure were also recorded. For analysis the data was sampled every ten minutes. The Annual Energy
Production (AEP) was estimated with widely used WAsP 9.0 software.