Wind resources: The average wind speeds
in Lombok are low. In the South, the average wind speed barely reaches 6 m/s
and moving North to Rinjani, the
average wind speeds are only 2 m/s. These low wind speeds call for wind
turbines designed for these conditions. The Vestas V150-4.2 MW is an example of
this. Its long blades (74 m) and large sweep area of 17,670 m2 make it possible
to utilise
energy in low wind conditions. Other manufactures have similar low speed
turbines – such as the Siemens Gamesa SG 4.5-155.
Location: The sub-district of Jerowaru is
chosen for the site analysed as
this location has some of the highest wind speeds in Lombok, and the land
covers are mostly dry land agriculture, which are assumed to be acquirable. The
land covered is around 100 ha (~1 km2 ); however, most of the land can still be
used for agriculture purposes.
Utilisation: An analysis of the power curve from a
V150-4.2 MW turbine and the distribution of wind speeds at a chosen site,
results in 3000 full load hours.
Capacity: Fluctuating power generation
can in the current system be a challenge for PLN. However, economy of scale
calls for higher capacity. A capacity of 50 MW is assessed to provide the best
balance
