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<p>In the last 30 years, there has been a total of 1340km of sub-sea electricity transmission
cables laid in the waters surrounding the UK.</p><p>This comprises 702km of licenced
sub-sea offshore transmission cables1 that connect offshore wind farms in UK territorial
sea and surrounding Renewable Energy Zone (REZ)2 to shore, and 638km of interconnector
cables, consisting of links from the UK mainland to France, the Netherlands, Northern
Ireland, the Republic of Ireland and the Isle of Man.</p><p>Lengths provided are for
sub-sea sections of cables only, and do not include onshore components that link to
relevant grid connection points.</p><p><strong>Table of licenced offshore transmission
projects</strong></p><table><tbody><tr><td><p><em>Licenced offshore wind farm transmission
assets</em></p></td><td><p><em>Sub-sea cable length (km)</em></p></td><td><p><em>Year
licence granted</em></p></td><td><p><em>Sea</em></p></td></tr><tr><td><p><em>Robin
Rigg East and West</em></p></td><td><p>25.2</p></td><td><p>2011</p></td><td><p>Irish
Sea</p></td></tr><tr><td><p><em>Sheringham Shoal</em></p></td><td><p>44</p></td><td><p>2013</p></td><td><p>North
Sea</p></td></tr><tr><td><p><em>Barrow</em></p></td><td><p>26.6</p></td><td><p>2011</p></td><td><p>Irish
Sea</p></td></tr><tr><td><p><em>Greater Gabbard</em></p></td><td><p>152.5</p></td><td><p>2013</p></td><td><p>North
Sea</p></td></tr><tr><td><p><em>Gunfleet Sands 1 and 2</em></p></td><td><p>9.3</p></td><td><p>2011</p></td><td><p>North
Sea</p></td></tr><tr><td><p><em>Ormonde</em></p></td><td><p>43</p></td><td><p>2012</p></td><td><p>Irish
Sea</p></td></tr><tr><td><p><em>Wallney 1</em></p></td><td><p>45.3</p></td><td><p>2011</p></td><td><p>Irish
Sea</p></td></tr><tr><td><p><em>Wallney 2</em></p></td><td><p>43.7</p></td><td><p>2012</p></td><td><p>Irish
Sea</p></td></tr><tr><td><p><em>Lincs</em></p></td><td><p>96</p></td><td><p>2014</p></td><td><p>North
Sea</p></td></tr><tr><td><p><em>London Array</em></p></td><td><p>216</p></td><td><p>2013</p></td><td><p>North
Sea</p></td></tr></tbody></table><p> </p><table><tbody><tr><td><p><strong><em>Total
Cable length</em></strong></p></td><td><p><strong>702</strong></p></td></tr></tbody></table><p>
</p><p><strong>Table of interconnectors</strong></p><table><tbody><tr><td><p><em>Interconnector</em></p></td><td><p><em>Sub-sea
cable length (km)3</em></p></td><td><p><em>Laying year(s)</em></p></td><td><p><em>Connection
points</em></p></td><td><p><em>Sea</em></p></td></tr><tr><td><p><em>IFA</em></p></td><td><p>45</p></td><td><p>19864</p></td><td><p>GB
– Folkestone, Kent</p><p>FR - Calais</p></td><td><p>English Channel</p></td></tr><tr><td><p><em>Moyle</em></p></td><td><p>53</p></td><td><p>20015</p></td><td><p>N.I
- Nr Belfast,</p><p>Scotland - near Stranraer</p></td><td><p>Irish Sea</p></td></tr><tr><td><p><em>BritNed</em></p></td><td><p>250</p></td><td><p>2009
to 20106</p></td><td><p>GB - Isle of Grain,</p><p>Netherlands - Maasvlakte</p></td><td><p>North
Sea</p></td></tr><tr><td><p><em>East West</em></p></td><td><p>186</p></td><td><p>2009
to 20127</p></td><td><p>GB - Deeside, north Wales,</p><p>Ireland - Woodland, County
Meath</p></td><td><p>Irish Sea</p></td></tr><tr><td><p><em>Isle of Man</em></p></td><td><p>104</p></td><td><p>20008</p></td><td><p>Bispham,
Blackpool to Douglas, Isle of Man</p></td><td><p>Irish Sea</p></td></tr></tbody></table><p>
</p><table><tbody><tr><td><p><strong><em>Total Cable length</em></strong></p></td><td><p><strong>638</strong></p></td></tr></tbody></table><p>
</p><p><em><strong>[1]</strong></em><em> Source – Ofgem. Offshore transmission is
defined as all electric lines of 132 kilovolts or more which are built for the purpose
of conveying electricity generated by an offshore generating station. The km length
figure does not include ‘inter array’ cables that connect individual wind turbines
to the nearby sub-station. </em></p><p><em>2</em><em> The REZ is an area of the sea,
beyond the UK’s territorial sea, which may be exploited for energy production. A map
of the REZ may be obtained from the UK Hydrographic Office - <a href="https://www.ukho.gov.uk/ProductsandServices/Services/Documents/Renewable_Energy_Web%20Page_Jan06_v2.pdf"
target="_blank">https://www.ukho.gov.uk/ProductsandServices/Services/Documents/Renewable_Energy_Web%20Page_Jan06_v2.pdf</a>
. A map of the ten offshore transmission projects tendered to date, as well as the
five projects currently in Ofgem’s competitive tender process, can be found on Ofgem’s
website - <a href="https://www.ofgem.gov.uk/electricity/transmission-networks/offshore-transmission/offshore-transmission-tenders"
target="_blank">https://www.ofgem.gov.uk/electricity/transmission-networks/offshore-transmission/offshore-transmission-tenders</a>
</em></p><p><em>3</em><em> Length provided refers to the distance between landing
points and does not take into account cable configurations of the interconnectors.</em></p><p><em>4<strong>[1]</strong>
Refers to the year IFA was commissioned. Source: National Grid - <a href="http://faculty.london.edu/mottaviani/IFA.pdf"
target="_blank">http://faculty.london.edu/mottaviani/IFA.pdf</a> </em></p><p><em>5</em><em>
Source: Mutual Energy - <a href="http://www.mutual-energy.com/The_Moyle_Interconnector/History_and_Development_of_the_Interconnector.php"
target="_blank">http://www.mutual-energy.com/The_Moyle_Interconnector/History_and_Development_of_the_Interconnector.php</a>
</em></p><p><em>6</em><em> Source: BritNed - <a href="http://www.britned.com/BritNed/About%20Us/Construction"
target="_blank">http://www.britned.com/BritNed/About%20Us/Construction</a></em></p><p><em>7</em><em>
Source: ABB - <a href="http://www05.abb.com/global/scot/scot221.nsf/veritydisplay/4d580b5e493d268dc1257c00003e44dc/$file/Overview%20of%20the%20500MW%20EirGrid%20East-West.pdf"
target="_blank">http://www05.abb.com/global/scot/scot221.nsf/veritydisplay/4d580b5e493d268dc1257c00003e44dc/$file/Overview%20of%20the%20500MW%20EirGrid%20East-West.pdf</a></em></p><p><em>8</em><em>
Source: AWJ Marine - <a href="http://www.awjmarine.co.uk/fishery-liaison/isle-of-man-interconnector/"
target="_blank">http://www.awjmarine.co.uk/fishery-liaison/isle-of-man-interconnector/</a></em></p>
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