18.5.5 Sub-sea cables 51.
The southern North Sea has a significant number of sub-sea cables; primarily telecommunication connections between the UK and continental Europe none of which cross the East Anglia THREE site (Figure 18.2).
52. One operational telecommunications cable crosses the offshore cable corridor at an approximate north-south trajectory indicating that there would be an interaction between the offshore cable corridor and cables already on the seabed (Figure 18.2). EATL will be submitting an application for the installation of up to four export cables and therefore four individual crossings could be required.
53.
The routes of the three Greater Gabbard offshore export cables and the three proposed Galloper offshore windfarm export cables also cross the offshore cable corridor from north to south (Figure 18.2). This would require up to 24 cable crossings assuming a worst case of four East Anglia THREE offshore export cables installed within the offshore cable corridor (See Chapter 5 Description of the Development for further details).
54.
In addition, there are disused cables that date from over 100 years ago, many of which are now lost or not shown on charts, and represent a risk to seabed activity. Modern charts only display cables decommissioned since 1987.
55.
Table 18.14 presents sub-sea cables and gas pipelines that pass through the proposed East Anglia THREE offshore cable corridor.
Table 18.14 Summary of operational offshore oil and gas pipelines and offshore cables which intersect the East Anglia THREE cable corridor.
Asset Name
Bacton / Zeebruge Interconnector
Atlantic Crossing 1 Netherlands 12 Farland Concerto 1S Greater Gabbard Asset type
Gas Pipeline Cable
Cable
Cable Cable
Three Export Cables
Galloper (consented) Transmission Cables (Up to 3) Cable Cable
Ulysses 2 Rembrandt 1 Operator
Interconnector Global Crossing
BT (Out Of Service) BT Interoute
Greater Gabbard Offshore Winds Limited
Galloper Wind Farm Limited Verizon KPN
General Trajectory (approximate)
North to south
North to south
East to west
East to west East-west
North-west to South-east
North-west to south-East East to west East to west
No. of Crossings
Anticipated 4
4
Not applicable 4 4
Up to 12
Up to 12 4
4
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 18 Infrastructure and other users Page 23
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