THREE project. A decision on the final electrical solution for the project will be made during the final design stage (i.e. only after a DCO is granted) and it will be based on the best available technology at that time and the solution which maximises transmission efficiency.
27.
The HVDC and LFAC technical solution requirements are different, and these differences are outlined below in Table 2.3. The differences mainly relate to the number of offshore electrical platforms (up to six for HVDC, and up to four for LFAC) and the area of the onshore substation area (2.85ha for HVDC, and 3.04ha for LFAC).
2.5 Worst Case 28.
For the purposes of impact assessment (whether the issue is ecological or affects the community), the worst case scenario is considered. This approach captures the uncertainty around the parameters of the final design - which will not be known until after the project is consented - and therefore covers the range of these within a ‘project design envelope’. This ensures that when consulting stakeholders for any topic, the maximum possible effect has always been addressed whether in terms of, for example, the spatial footprint of infrastructure, number of vehicle movements or noise generated during construction.
29.
The worst case scenario is the HVDC solution in terms of the maximum parameters (e.g. footprint of infrastructure) with the exception of the size of the onshore substation. As a result, the worst case scenario for the LFAC falls within the worst case scenario of the HVDC in all scenarios with the exception of substation size.
30.
The HVDC scenario will therefore be used throughout the assessment of the Single Phase and Two Phased approach to construction. At the substation, the larger LFAC substation presents the worst case scenario.
2.6 Summary of Proposed Project Description Changes
31. A full detailed description of the project parameters assessed as part of the PEIR, in comparison with the project parameters for and under the Single Phase and Two Phased option is displayed in Table 2.2. In some cases there have been minor changes to parameters (other than those required for phasing) and these are the result of further refinement of the project design envelope since the PEIR.
Phase III Report June 2015
East Anglia THREE Offshore Windfarm Page 13
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