Galloper Wind Farm Project - National Infrastructure Planning

2842_SLVIA
2
Table 1: WTG range considered for GWF
WTG detail 107m rotor 120m rotor 164m rotor
Typical MW
rating
Minimum
clearance above
MHWS
Maximum No.
WTG in array
3 - 3.6MW 3.6 - 4MW 6 - 7MW
22m 22m 22m
140 140 72
Hub height 79.5m 86m 120m
Maximum tip
height
135m 146m 195m
1.2.2. To identify the potential 'worst case' scenario two options were tested by
preparing draft wireframes from two viewpoints on the coast (Viewpoints 5
and 7 shown on Figure 06):
� the largest WTGs currently being considered (195m to blade tip) (which
give the most widely spaced and lowest number of WTGs (72)); and
� the smallest WTGs with highest tip height currently being considered
(146m to blade tip) (which give the most closely spaced and largest
number of WTGs (140)).
1.2.3. It was concluded that there was little perceptible difference in the appearance
of the two schemes from the viewpoints and that it would be logical to use
the tallest WTGs for the SLVIA, given that a greater height of WTG would be
visible above the horizon from the land based viewpoints. This SLVIA,
therefore, assesses the effects of 72 number 7MW WTGs with nominal hub
and blade tip heights of 120 and 195m above sea level respectively, laid out in
a regular grid. It is considered that an irregular layout or smaller turbines
would not result in increased effects.
1.2.4. The proposed GWF consists of two principal array areas (Area A centred
around the Outer Gabbard Bank, and Area B and C, to the east and west of the
Galloper Bank respectively). The WTGs will be arranged in rows in a northeasterly
to south-westerly direction forming an extension to the GGOWF.