428. A permanent easement would be sought by EATL directly over the cables. The easement would seek to restrict activities which would penetrate the ground by more than 0.5m. As such, it is expected that normal agricultural activities would be able to continue.
429. Routine maintenance is anticipated as consisting of one annual visit to jointing pits to carry out routine integrity tests, which would be accessed by digging down to man-hole covers and possible non-intrusive checking of the cable in between junction pits with, for instance, ground penetrating radar.
430. Appropriate off-road vehicles would be used to access each jointing pit. Jointing pits would therefore be located adjacent to field boundaries or roads as possible. Kiosks could be used as an alternative maintenance access point to jointing pits.
431. Non-scheduled maintenance to address faults as and when these may arise would also be necessary, and this maintenance could be required in between jointing pit or kiosk locations.
5.6.7 Onshore cable route decommissioning 432. It is anticipated that the onshore cable would be decommissioned (de-energised) and trenched cables left in-situ. However, where cables have been installed in pre- installed ducts (future projects) it may prove possible to extract the cables relatively easily during the decommissioning phase. It has been assumed that the jointing pits and ducts would be left in-situ.
5.6.8 Onshore converter station(s): site description 433. The maximum case for East Anglia THREE is for two adjacent onshore converter stations in the same compound. The minimum case is for one onshore converter station.
434. An onshore converter station(s) is required for East Anglia THREE, and is proposed to be sited adjacent to the north of the existing National Grid Bramford Substation, and directly east of the proposed East Anglia ONE converter station. During the site selection of the East Anglia ONE converter station location, a key factor was to identify a space suitable for converter station sites for two future projects (East Anglia THREE and East Anglia FOUR). “Onshore converter station” means onshore converter(s) housed within one or more converter halls and a compound containing electrical equipment and other associated equipment.
435. The purpose of the converter station(s) is to change the electrical current from HVDC to HVAC, to be compatible with the National Grid in the electrical transmission network.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 5 Description of the Development Page 97
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