5 DESCRIPTION OF THE DEVELOPMENT


5.1 Introduction 1.


2.


This chapter provides a full description of the components required for construction, operation and decommissioning of the proposed East Anglia THREE project and the methods of installation.


A brief overview of the project is presented in section 5.2 followed by an outline of the key project characteristics in section 5.3. A detailed description of all aspects of the project is provided in sections 5.4 to 5.6 which is divided into the following three areas:


 Offshore - wind turbines, offshore collector stations and converter stations, meteorological masts and their foundations, and offshore export cables, fibre optic cables, interconnection cables and inter-array cables;


 Landfall - work to connect offshore export cables to onshore export cables and provide maintenance access; and


 Onshore - onshore export cables, the onshore converter station(s), and work to construct and access these components.


5.1.1 Project Design Envelope 3.


4.


Section 3.5 of Chapter 3 Policy and Legislative Context provides a background to the design envelope approach.


The project design envelope sets out a series of design options for the project. The project design envelope has a reasoned minimum and maximum extent for a number of key parameters. The final design would lie between the minimum and the maximum extent of the consent sought, for all aspects of the project, this includes spatial, temporal and installation methodology. The project design envelope is used to establish the extent to which the project would impact on the environment. The detailed design of the project could then vary within this ‘envelope’ without rendering the assessment inadequate.


5.


The general principle of the assessment is that for each specialism, the impact assessment is based on a range of project design parameters (e.g. the minimum and maximum tip height of wind turbines that could be used, are between 178 and 247m above lowest astronomical tide (LAT) and the minimum and maximum blade length is between 75 and 108m), the key being that those parameters selected represent the range of options within which the greatest environmental impact would occur.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 5 Description of the Development Page 1


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