Part 2 - Eskom

ENVIRONMENTAL SCOPING REPORT FOR THE PROPOSED 40MW OPEN CYCLE GAS TURBINE POWER
PLANT IN THE AMERSFOORT AREA, MPUMALANGA
7.1.3. Wind
Bohlweki-SSI Environmental
The UCG pilot plant has its own meteorological station, however data from the
SAWS has been included to ensure that the data from the UCG pilot plant station is
correct. Comparison was made between data sourced from the UCG pilot plant and
data taken from the South African Weather Services. The period wind rose and
frequency distribution for the UCG site is presented in Figure 7.4 and Figure 7.5 and
the period wind rose and frequency distribution for the data sourced from the South
African Weather Services is presented in Figure 7.6 and Figure 7.7. Wind roses
comprise of 16 spokes which represent the directions from which winds blew during
the period. The colours reflect the different categories of wind speeds. The dotted
circles provide information regarding the frequency of occurrence of wind speed and
direction categories.
For the period assessed, winds predominated from the western and eastern sectors.
The wind rose profile is typical of that experienced by low lying areas surrounded by
an escarpment. From the eastern vector wind speeds of between 5.7-8.8m/s
occurred most of the time. The same wind speeds occurred but were less common
from the south easterly and north eastern sectors. Stronger winds of greater than
8.8m/s were also experienced from the west. Smaller contributions of strong winds
were also experienced from the west-southwest and west-northwest directions.
Figure 7.4: Period wind rose derived from monitored data from the UCG pilot
plant (2006 to 2007)
E02.JNB.000308
ESKOM HOLDINGS LIMITED
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08/10/2009