21. Definition of the worst case assumptions has been made fromconsideration of the detail about the proposed East Anglia THREE project that is presented in Chapter 5 Description of the Development, alongside the mitigation measures that have been embedded in the design (section 7.3.3).
7.3.2.1 Layout 22.
The precise numbers, ratings and layout configuration of the wind turbines within the proposed East Anglia THREE project are not yet determined, and may not be known until sometime after the Development Consent Order (DCO) has been granted. However, within the East Anglia THREE site up to three different sizes of wind turbine could be used, but in any case the minimum and maximum sized wind turbines would be within the range 7 to 12MW.
23.
This means that in order to achieve the 1,200MW installed capacity, there could be a minimum of 100 12MWwind turbines or a maximum of 172 7MWwind turbines, or a combination of numbers and wind turbine ratings in between.
24.
The wind turbines would be arranged in blocks with regular rows, with a minimum spacing between adjacent wind turbines of 675m within each row and a minimum spacing of 900m between rows.
7.3.2.2 Foundations 25.
The precise foundation types and sizes for the wind turbines within the proposed East Anglia THREE project are unknown, and may not be known until sometime after the DCO has been granted. There could be only one type used or alternatively a combination of foundation types and sizes could be used across the windfarm site. Some types and sizes of foundation are more favourable for certain water depths, ground conditions or wind turbine models and the final arrangements would be confirmed during detail design considerations.
26.
Accordingly, to ensure the proposed East Anglia THREE project is adequately assessed for the purposes of EIA, foundation sizes covering the range from7MW to 12MW wind turbines, and including monopiles, tripods with pin piles, tripods with suction buckets, jackets with pin piles, jackets with suction buckets, suction caisson and gravity base structures have been considered to determine the worst case assumptions.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 6
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