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London Array

London Array offshore wind farm
File:London Array 02.jpg
The London Array under construction in 2009.
Location of London Array offshore wind farm in England
Country England, United Kingdom
Location Script error: No such module "convert". off North Foreland, Kent

51°37′34″N 1°29′42″E / 51.626°N 1.495°E / 51.626; 1.495Coordinates: 51°37′34″N 1°29′42″E / 51.626°N 1.495°E / 51.626; 1.495{{#coordinates:51.626|1.495|type:landmark_region:GB_dim:100000|||||| |primary |name=

Status Operational
Construction began March 2011
Commission date April 2013
Construction cost £1.8 billion (€2.2 billion)

Wind farm:

Transmission assets:

Wind farm
Type Offshore
Power generation
Units operational 175
Make and model Siemens Wind Power SWT-3.6-120
Nameplate capacity 630MW

The London Array is a 175 turbine 630MW Round 2 offshore wind farm located 20 km off the Kent coast in the outer Thames Estuary in the United Kingdom. It is the largest offshore wind farm in the world, and the largest wind farm in Europe by megawatt capacity.

Construction of phase 1 of the wind farm began in March 2011 and was completed by mid 2013, being formally inaugurated by the Prime Minister of the United Kingdom, David Cameron on 4 July 2013.

The second phase of the project was refused planning consent in 2014 due to concerns on impact on sea birds.


The wind farm site is more than Script error: No such module "convert". off the North Foreland on the Kent coast in the area of Long Sand and Kentish Knock, between Margate in Kent and Clacton in Essex.[1]

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.[2] Each turbine and offshore substation is erected on a monopile foundation, and connected together by Script error: No such module "convert". 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 Script error: No such module "convert"..[2]

The smaller Thanet Wind Farm is to the south of it.

The array is intended to reduce annual CO2 emissions by about 900,000 tons, equal to the emissions of 300,000 passenger cars.[3]


In 2001 environmental studies identified areas of the outer Thames Estuary as potential sites for offshore wind farm;[4] 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)).[5] 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.[4][8] A planning application was submitted in 2005,[8][9] which was approved in December 2006.[10] Planning permission for the onshore electricity substation was received in November 2007.[7]

In May 2008, Shell announced that it was pulling out of the project.[11] It was announced in July 2008 that E.ON UK and DONG Energy would buy Shell's stake.[12] 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.[13][14] The resultant ownership was 50% DONG Energy, 30% E.ON UK Renewables and 20% Masdar.[15]

In March 2009, the backers agreed on an initial investment of €2.2 billion.[16] Financing of phase 1 was achieved through the European Investment Bank and the Danish Export Credit Fund with £250 million.[15]

In 2013, in response to "Offshore Transmission Owner" regulations (see Ofgem), 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 (Mitsubishi Corporation subsidiary).[17]

In January 2014 Dong sold half its stake to Quebec public pension plan manager Caisse de dépôt et placement du Québec ("La Caisse").[18]

At the time of its construction it was the largest offshore wind farm in the world.[19]

Construction and commissioning

Offshore work began in March 2011;[20] the first foundation was installed in March 2011[21]

Turbines were supplied by Siemens Wind Power.[22] Their foundations were built by the joint-venture between Per Aarsleff and Bilfinger Berger Ingenieurbau. The same company supplied and installed the monopiles.[23] Generators were installed by MPI and A2SEA by using an installation vessel TIV MPI Adventure and a jack-up barge Sea Worker.[24] 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.[23]

The wind farm started producing electricity at the end of October 2012.[20] All 175 turbines of phase 1 were confirmed fully operational on 8 April 2013,[25] and the wind farm was formally inaugurated by the Prime minister David Cameron on 4 July 2013.[26]

Phase 2

A second phase was planned which would have seen a further 166 turbines installed to increase the capacity to 1000MW.[27] 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.[27][28]

See also

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  1. ^ "Preliminary Information Memorandum: London Array (Phase 1) Offshore Transmission Assets" (PDF). Ofgem. November 2010. p. 3. 
  2. ^ a b Nathan 2012
  3. ^ "London Array Offshore Windfarm Inaugurated",, 5 July 2013 
  4. ^ a b The London Array (London Array), p.6
  5. ^ Future Offshore -A Strategic Framework for the Offshore Wind Industry (PDF), Department of Trade and Industry, Nov 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 
  6. ^ "Dong Energy London Array Limited",, retrieved May 2014 
  7. ^ a b London Array welcomes latest government permissions (press release), 7 November 2007 
  8. ^ a b "Plan for massive Thames wind farm", BBC News, 7 June 2005 
  9. ^ ES Non-technical summary (June 2005)
  10. ^ "Offshore wind farms get go-ahead", BBC News, 18 December 2006 
  11. ^ Shell pulls out of key wind power project, Financial Times, 1 May 2008 
  12. ^ "E.ON and DONG Energy become 50:50 partners in world's largest offshore wind farm" (Press release). E.ON. 21 July 2008. 
  13. ^ Milner, Mark (17 October 2008). "Abu Dhabi buys 20% of London Array". 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%. 
  14. ^ "Masdar to invest in London Array offshore wind farm as first step of a global renewable energy partnership with E.ON" (Press release). E.ON. 16 October 2008. 
  15. ^ a b Mette Buck, Jensen (9 June 2010), Dong låner 2,2 milliarder kroner til britisk vindmølleeventyr (in Danish), Ingeniøren ( 
  16. ^ Teather, David (13 May 2009), Thames offshore wind farm gets green light from investors, The Guardian 
  17. ^ Disposal of transmission assets at London Array, the world's largest offshore wind farm (press release), Dong Energy, 10 September 2013 
  18. ^ "Dong sells half of its London Array stake",, 31 January 2014 
  19. ^ Platt, Edward (28 July 2012), "The London Array: the world's largest offshore wind farm", 
  20. ^ a b Bradbury, John (5 November 2012). "First power from London Array". • International (Offshore Media Group). 
  21. ^ First foundation installed at London Array (PDF) (press release), 8 March 2011, archived from the original on 11 March 2012 
  22. ^ "Siemens to provide 175 wind turbines for the world's largest offshore wind farm London Array" (Press release). Siemens AG. 19 May 2009. 
  23. ^ a b Pitt, Anthea (14 December 2009). "Trio hand out London Array prizes". Upstream Online (NHST Media Group). (subscription required)
  24. ^ "London Array signs final major installation contracts for phase one" (Press release). London Array. 4 February 2010. 
  25. ^ "Hip Hip Array-World's largest offshore wind farm goes fully operational". (Press release). RenewableUK. 8 April 2013. 
  26. ^ Al Makahleh, Shehab (4 July 2013). "London Array, world's largest offshore wind farm, inaugurated" (Press release). 
  27. ^ a b "Sea bird halts London Array wind farm expansion", BBC News, 19 February 2014 
  28. ^ Smith, Patrick (19 February 2014), "London Array phase 2 extension scrapped", 


  1. ^ After 26 June 2007 Core Limited became known as Dong Energy London Array Limited.[6] Core Ltd. was a joint venture between Dong Energy A/S (Denmark) and Farm Energy Ltd. (UK) see notes in E.ON 7 November 2007 press release.[7]



External links