The London Array as seen from an airplane flying in to London City Airport
|Location||7 mi (11 km) off North Foreland, Kent|
|Commission date||April 2013|
|Construction cost||£1,800 million|
|Owner(s)||Caisse de dépôt et placement du Québec|
|Max. water depth||25 m|
|Distance from shore||20 km|
|Hub height||87 m|
|Rotor diameter||120 m|
|Site area||122 km2 (47 sq mi)|
|Units operational||175 × 3.6 MW|
|Make and model||Siemens Wind Power SWT-3.6-120|
|Nameplate capacity||630 MW|
|Capacity factor||45.3% (2015)|
|Annual net output||2,500 GWh (2015)|
|Commons||Related media on Commons|
The London Array is a 175 turbine 630 MW Round 2 offshore wind farm located 20 km off the Kent coast in the outer Thames Estuary in the United Kingdom. It is the second largest offshore wind farm on Earth, after the Walney Extension.
The second phase of the project was refused planning consent in 2014 due to concerns over the impact on sea birds.
The wind farm site is more than 20 kilometres (12 mi) off the North Foreland on the Kent coast. It is in the area between Long Sand and Kentish Knock, between Margate in Kent and Clacton in Essex. The site has water depths of no more than 25 m and is mostly away from deep water shipping lanes. It is north of the shallow cross estuary channel, the Fisherman's Gat and astride of the Foulger's Gat.
The first phase consisted of 175 Siemens Wind Power SWT-3.6 turbines and two offshore substations, giving a wind farm with a peak rated power of 630 MW. Each turbine and offshore substation is erected on a monopile foundation, and connected together by 210 km (130 mi) of 33 kV array cables. The two offshore substations are connected to an onshore substation at Cleve Hill (near Graveney) on the north Kent coast, by four 150 kV subsea export cables, in total 220 km (140 mi). It is named after London because the power goes to the London grid.
The smaller Thanet Wind Farm is to the south.
In 2001 environmental studies identified areas of the outer Thames Estuary as potential sites for offshore wind farms; the Department of Trade and Industry published the paper Future Offshore — A Strategic Framework for the Offshore Wind Industry, which identified the outer Thames Estuary as one of three potential areas for future wind farm development (Round 2 wind farms). The Crown Estate awarded a 50-year lease to London Array Ltd (a consortium of E.ON UK Renewables, Shell WindEnergy, and CORE Limited[note 1]) in December 2003. A planning application was submitted in 2005, which was approved in December 2006. Planning permission for the onshore electricity substation was granted in November 2007.
In May 2008, Shell announced that it was pulling out of the project. It was announced in July 2008 that E.ON UK and DONG Energy would buy Shell's stake. Subsequently, on 16 October 2008, London Array announced the Abu Dhabi based Masdar would join E.ON as a joint venture party in the scheme. Under the agreement, Masdar purchased 40% of E.ON's half share of the scheme, giving Masdar a 20% stake in the project overall. The resultant ownership was 50% DONG Energy, 30% E.ON UK Renewables and 20% Masdar.
In March 2009, the backers agreed on an initial investment of €2.2 billion. Financing of phase 1 was achieved through the European Investment Bank and the Danish Export Credit Fund with £250 million.
In 2013, in response to Ofgem "Offshore Transmission Owner" regulations, the consortium divested the electrical transmission assets of the wind farm (valued at £459 million) to Blue Transmission London Array Limited – an entity incorporated by Barclays Infrastructure Funds Management Limited (Barclays) and Diamond UK Transmission Corporation (a Mitsubishi Corporation subsidiary).
At the time of its construction it was the largest offshore wind farm in the world.
Construction and commissioning
Turbines were supplied by Siemens Wind Power. Their foundations were built by a joint-venture between Per Aarsleff and Bilfinger Berger Ingenieurbau GmbH. The same company supplied and installed the monopiles. Generators were installed by MPI and A2SEA, using an installation vessel TIV MPI Adventure and a jack-up barge Sea Worker. Two offshore substations were designed, fabricated and installed by Future Energy, a joint venture between Fabricom, Iemants and Geosea, while electrical systems and onshore substation work was undertaken by Siemens Transmission & Distribution. The subsea export cable was supplied by Nexans and array cables by JDR Cable Systems. The array cables and the export cables were installed by VSMC.
The wind farm started producing electricity at the end of October 2012. All 175 turbines of phase 1 were confirmed fully operational on 8 April 2013, and the wind farm was formally inaugurated by the Prime minister David Cameron on 4 July 2013. In December 2015 it produced 369 GWh, a monthly capacity factor of 78.9%. It produced 2.5 TWh in 2015. During two days of January 2016, production varied from 3 MW to 619 MW.
A second phase was planned which would have seen a further 166 turbines installed to increase the capacity to 1000 MW. However, the second phase was scaled back and finally cancelled in February 2014 after concerns were raised by the Royal Society for the Protection of Birds about its effect on a local population of red-throated divers.
- List of offshore wind farms in the United Kingdom
- List of offshore wind farms
- List of offshore wind farms in the North Sea
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- Nathan 2012
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- The London Array (London Array), p.6
- Future Offshore -A Strategic Framework for the Offshore Wind Industry (PDF), Department of Trade and Industry, November 2002, p.9; table 2.2, p.26; 4.3.3, pp.41-43; table 4.1, p41; fig.4.1, p.42;, archived from the original (PDF) on 16 February 2014
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initially, it was to have been developed by E.ON, Dong Energy and Shell, but Shell pulled out this year, arguing that the scheme did not meet its financial rates of return. The remaining partners subsequently raised their 33% stakes to 50%.
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- Pitt, Anthea (14 December 2009). "Trio hand out London Array prizes". Upstream Online. NHST Media Group.(subscription required)
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- "Hip Hip Array-World's largest offshore wind farm goes fully operational". www.renewableuk.com (Press release). RenewableUK. 8 April 2013. Archived from the original on 12 July 2013.
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- Nathan, Stuart (25 June 2012). "The Big Project: London Array". The Engineer.
- Environmental Statement - Non-technical summary (PDF), London Array Ltd., June 2005, archived from the original (PDF) on 26 May 2013
- London Array - the world's largest offshore wind farm (PDF), London Array Ltd., archived from the original (PDF) on 20 September 2011
- "London Array Phase 1", www.4coffshore.com
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