Impact
Impact 5: Disruption to oil and gas activity
Impact 6: Disruption to Ministry of Defence Activities
Impact 7: Disruption of unexploded ordnance
Decommissioning
Impact 1: Interference and damage to sub-sea cables and pipelines
Impact 2: Disruption of unexploded ordnance
Four offshore export cables
Any activity employed during decommissioning which will make contact with the seabed
The worst case scenario is that sub-sea cables will be damaged during the removal of East Anglia THREE export cables.
The maximum footprint of decommissioning activity will have the greatest chance of disturbing UXO, however given that the preconstruction survey would have identified any UXO in the vicinity of the windfarm infrastructure the chance of disturbing UXO at decommissioning is very small.
Note: that there would be up to two cables to interconnect the proposed East Anglia THREE and East Anglia ONE projects. The cables would either be two cables, subject to detailed design and future technology developments. Each would be up to 90km in length. The locations where these interconnections join the East Anglia ONE electrical infrastructure would be identified following detailed electrical design and would be dependent upon the location of the East Anglia ONE converter stations. These cables have not been assessed as part of the worst case and once interconnection cable routeing has been determined they will be added into the assessment.
Key design parameters forming the realistic worst case scenario
As above (operation impact 1) As above (operation impact 1) Maintenance activity
Rationale As above (operation impact 1) As above (operation impact 1) Any maintenance activity which will make contact with the seabed.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 18 Infrastructure and other users Page 9
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