Renewable Energy Technology Assessments - Kauai Island Utility ...

Kaua’i Island Utility Cooperative
Renewable Energy Technology Assessments 9.0 Wind
Analyses yielded an approximate capacity factor of 36 percent at 50 meters on the
anemometer site for an annual energy yield of 21 GWh. Figure 9-10 shows power
consumption for a Thursday in April 1996 with projected power production from a 6.6
MW Hanapepe project. Projected output from this ridgeline site has a fairly flat profile
through all seasons.
Wind Capacity Factor
60%
50%
40%
30%
20%
10%
0%
Winter
Spring
Summer
Fall
Load: Thurs. April 4, 1996
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Figure 9-10. Diurnal and Seasonal Capacity Factor with KIUC Summer Loads and
Project Output, Hanapepe Area.
Anahola
Anahola site performance estimates were made using the using 27 m (90 ft)
anemometer data scaled up to 50 meters using a wind sheer factor of 0.1 (appropriate for
ridgline terrain). The data was then further scaled to the better wind on the ridge of Mt.
Puu Ehu using a ratio of 8/6 which is the ratio of wind speeds shown on the verified 50m
wind speed map. These speeds were then modeled with the Vestas V47 power curve, air
density information and other factors to estimate capacity factor and the seasonal and
diurnal power variation. Due to the distant location of the wind data, the information
herein is only an indication of pattern and intensity. Data at or near hub height from the
proposed site is necessary to give a firm estimate of production.
21 March 2005 9-20 Black & Veatch
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Load (MW)