2 THE SITE
2.1 Proposed development The construction of the East Anglia ONE offshore windfarm in the southern area of the East Anglia Zone, would necessitate to completion of associated onshore electrical transmission works. This would include bringing the offshore cable onshore at
the landfall location and laying the onshore cable to reach the appointed National Grid
substation, plus the construction of an onshore converter station (near to the substation) in order to transform the current from DC to AC for onwards transmission. At the time of writing, it is possible that horizontal directional drilling (HDD) would be an option for bringing the cable onshore, beyond which a trench will be excavated to house the cable. The converter station will located near to an existing electricity substation.
2.2 Site location and description
For the purposes of this PRA, the project has been discussed as three discrete sections: the landfall location, the Preferred Onshore Cable Corridor, and the Converter Station Refined Area of Search. These are shown on Volume 6, Figure 20.1.1.
2.2.1 Landfall
The landfall location is between the mouth of the River Deben to the south and Bawdsey to the north. Initially, an area approximately 1.7km long from north to south was being considered, to allow the ES process to identify the most suitable landfall location. This site was centred on grid reference 635 239. Since the first revision of this PRA, the landfall location has been refined and now centres on grid reference 6346 2385.
2.2.2 Preferred Onshore Cable Corridor
The Preferred Onshore Cable Corridor would come onshore at the selected landfall location and proceed in a west-north-westerly orientation, parallel to the River Deben. The Onshore Cable Route would cross the river approximately 3km inland, head west for a further 2km before travelling roughly parallel to the River Deben as far north as Broom Hill (south Woodbridge). The route would then proceed in a roughly westerly direction to the north of Ipswich, crossing the A14 and the railway to the north west of Ipswich before turning south westwards to reach the Converter Station Compound.
2.2.3 Converter Station Refined Area of Search
The Preferred Converter Station is located approximately 2.5km west of Bramford, close to an existing electricity substation.
East Anglia Offshore Wind Limited
Preliminary Risk Assessment, East Anglia ONE Windfarm 41388-PRA(03)
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