The London Array Wind Farm is a planned offshore wind farm under construction in the outer Thames Estuary in the United Kingdom. With 1,000 megawatt (MW) capacity, it is expected to become the world's largest offshore wind farm. The site is 17.77 miles (28.60 km) off the North Foreland on the Kent coast in the area of Long Sand and Kentish Knock, and will cover 90 square miles (230 km²) between Margate in Kent and Clacton in Essex. The first foundation was installed in March 2011.

The first phase of London Array Wind Farm will consist of 175 SWT-3.6 turbines and two offshore substations. All turbines and also offshore substations will be erected on 177 monopiles. In addition, the first stage includes 220 kilometres (140 mi) of 150 kV subsea export cable connecting the offshore substations to the shore and 210 kilometres (130 mi) of 33 kV array cables to link the turbines to each other and to the offshore substations and a new onshore substation near Graveney on the north Kent coast.

The proposers say this is enough to power a quarter of the homes in Greater London or the entire counties of Kent and East Sussex.

The Wind Turbines will be supplied by Siemens Wind Power. Their foundations are built by the joint venture between Per Aarsleff and Bilfinger Berger Ingenieurbau. The same company supply and install monopiles. Generators will be installed by MPI and A2SEA by using an installation vessel MPI Adventure and a jack-up barge Sea Worker. Two offshore substations will be designed, fabricated and installed by Future Energy, a joint venture between Fabricom, Iemants and Geosea, while electrical systems and onshore substation work will be undertaken by Siemens Transmission & Distribution. The subsea export cable will supply by Nexans and array cables by JDR Cable Systems. The array cables will be installed by Global Marine Systems and the export cables will be installed by VSMC.

Ownership is 50% DONG Energy, 30% E.ON UK Renewables and 20% Masdar. The wind farm was planned to be built by London Array Limited, a consortium of Shell WindEnergy Ltd, E.ON UK Renewables and DONG Energy. 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.

In March 2009, the backers agreed on an initial investment of €2.2 billion. Offshore work is due to started in February 2011 and the proposed completion date for the first stage is in 2012. The second stage (bringing the revised total to 217 turbines) will add enough capacity to generate 1,000 MW for 750,000 homes. Financing of phase 1 have been achieved through the European Investment Bank and Danish Export Credit Fund with £250 million.

London Array Offshore Wind Farm
Country	England, United Kingdom
Locale	7 miles (11 km) off North Foreland, Kent
Status	Under construction
Construction began	March 2011
Commission date	2012 (expected)
Owner(s)	DONG Energy (50%) E.ON UK Renewables (30%) Masdar (20%)
Developer(s)	London Array Limited
Turbine information
Turbines	341 x 3.6MW
Manufacturer(s)	Siemens Wind Power
Wind farm information
Distance from shore	7 mi (11 km)
Power generation information
Maximum capacity	1,000 MW