List of offshore wind farms in the United Kingdom

This is a list of offshore wind farms within the national maritime boundaries of the United Kingdom. The name of the wind farm is the name used by the energy company when referring to the farm; it is usually related to the name of the nearest town on shore.[1][2][3] There are currently c.6-7GW of offshore wind in the UK, with a further 4-5GW having secured development contracts.

Thames Estuary and Wind Farms from Space NASA with annotations
Four offshore wind farms are in the Thames Estuary area: Kentish Flats, Gunfleet Sands, Thanet and London Array. The latter was the largest in the world from April 2013 to September 2018.

Operational offshore wind farms

Name Cap.
(MW)
Turbines Location Country Project commissioning Build
Cost
Cap.
fac.
Depth
range (m)
km to
shore
Owner Refs.
Barrow 90 30 × Vestas V90-3.0MW 53°59′00″N 3°17′00″W / 53.98333°N 3.28333°W England 2006 July £123m 35.9%[4] 15–20 7 Ørsted [w 1][5]
Beatrice 10 2 × REpower 5M 58°06′20″N 03°05′35″W / 58.10556°N 3.09306°W Scotland 2007 July £35m 20% 45 23 SSE and Talisman Energy [w 2][6]
Beatrice extension 588 84 58°06′20″N 03°05′35″W / 58.10556°N 3.09306°W Scotland 2019 July £2,600 million 45 23 SSE and Talisman Energy [7][8]
Blyth Offshore 4 2 × Vestas V66-2MW 55°08′09″N 01°29′25″W / 55.13583°N 1.49028°W England 2000 December £4m 6–11 1.6 E.ON
Burbo Bank 90 25 × Siemens SWP 3.6–107 53°29′00″N 3°11′00″W / 53.48333°N 3.18333°W England 2007 September £90m 32–35% 0–6 7 Ørsted [w 3][9]
Burbo Bank Extension 258 32 × Vestas V164 8.0 MW 53°29′00″N 3°11′00″W / 53.48333°N 3.18333°W England 2017 April 6–13 Ørsted
Dudgeon 402 67 × Siemens SWT-6.0–154 53°15′00″N 1°23′00″E / 53.25000°N 1.38333°E England 2017 October £1,500m 48% Equinor, Statkraft [10][11]
European Offshore Wind Deployment Centre 93 11 × Vestas V164-8MW 57°13′0″N 1°59′0″W / 57.21667°N 1.98333°W Scotland 2018 September 32 3 European Offshore Wind Deployment Centre [w 4][12]
Greater Gabbard 504 140 × Siemens SWT-3.6–107 51°56′0″N 1°53′0″E / 51.93333°N 1.88333°E England 2012 September £1,500m 42.2%[4] 20–32 23 SSE Renewables [w 5]
Gunfleet Sands 1 & 2 172 48 × Siemens SWP-3.6–107 51°43′0″N 01°12′50″E / 51.71667°N 1.21389°E England 2010 April £300m 36.6% 2–15 7 Ørsted [w 6][13]
Gunfleet Sands 3 – Demonstration Project 12 2 × Siemens SWT-6.0 120 51°43′0″N 01°12′50″E / 51.71667°N 1.21389°E England 2013 April £51m 31.1% 5–12 8 Ørsted [w 7]
Gwynt y Môr 576 160 × Siemens SWT-3.6 107 53°27′00″N 03°35′00″W / 53.45000°N 3.58333°W Wales 2015 June >£2,000m 31.7% 20 17 RWE Npower, Stadtwerke München, GIB, Siemens [w 8]
Humber Gateway 219 73 × Vestas V112 3.0MW 53°38′38″N 0°17′35″E / 53.64389°N 0.29306°E England 2015 June £736m 41.1% 15 10 E.ON [w 9]
Hywind Scotland 30 5 × Siemens SWT-6.0-154 6MW 57°29′0″N 1°21′0″W / 57.48333°N 1.35000°W Scotland 2017 October NOK2 billion (£152m) 95–120 25 Equinor, Masdar
Kentish Flats 140 30 × Vestas V90-3.0MW, 15 Vestas V112-3.3MW 51°27′36″N 01°05′24″E / 51.46000°N 1.09000°E England 2005 October £121.5m 31.3%, 42.9%[4] 3–5 10 Vattenfall [w 10][14]
Lincs 270 75 × Siemens SWT-3.6–120 53°11′0″N 0°29′0″E / 53.18333°N 0.48333°E England 2013 September £1,000m 42% 10–15 8 Centrica, Siemens, Ørsted [w 11][15]
London Array 630 175 × Siemens SWT-3.6 51°38′38″N 1°33′13″E / 51.64389°N 1.55361°E England 2013 April £1,800m 41.1%[4] 0–25 20 Ørsted, E.ON UK Renewables, Masdar [w 12]
Lynn and Inner Dowsing 194 54 × Siemens SWP-3.6–107 53°07′39″N 0°26′10″E / 53.12750°N 0.43611°E England 2009 March £300m 34.9% 6–11 5 Centrica 50%
TCW 50%
[w 13][16]
Methil 7 1 × Samsung 7 MW 56°09′46″N 03°00′32″W / 56.16278°N 3.00889°W Scotland 2013 October 5 0.05 Samsung, 2-B Energy [w 14]
North Hoyle 60 30 × Vestas V80-2MW 53°26′00″N 3°24′00″W / 53.43333°N 3.40000°W Wales 2003 December £80m 31.5% 5–12 7 Npower (UK) (RWE) [w 15][17]
Ormonde 150 30 × REpower 5MW 54°06′00″N 3°24′00″W / 54.10000°N 3.40000°W England 2012 August £552m 39.5%[4] 17–22 9.5 Vattenfall [w 16][18]
Race Bank 580 91 × Siemens SWT-6.0–154 53°16′30″N 0°50′30″E / 53.27500°N 0.84167°E England 2018 February Ørsted [19]
Rampion 400 116 × Vestas V112-3.45MW 50°40′00″N 0°16′00″W / 50.66667°N 0.26667°W England 2018 April £1,300m 13 E.ON [20][21]
Rhyl Flats 90 25 × Siemens SWP 3.6–107 53°22′00″N 3°39′00″W / 53.36667°N 3.65000°W Wales 2009 December £198m 32.9%[4] 4–15 8 Npower (UK) (RWE) [w 17][22]
Robin Rigg 180 60 × Vestas V90-3.0MW 54°45′00″N 3°43′00″W / 54.75000°N 3.71667°W Scotland 2010 April £396m 35.1%[4] 0–12 11 E.ON [w 18][23]
Scroby Sands 60 30 × Vestas V80-2MW 52°38′0″N 1°47′0″E / 52.63333°N 1.78333°E England 2004 March £75.5m 30.7%[4] 0–8 2.5 E.ON [w 19][24]
Sheringham Shoal 317 88 × Siemens SWT-3.6–107 53°07′0″N 1°08′0″E / 53.11667°N 1.13333°E England 2012 September £1,100m 40.7%[4] 12–24 17 Equinor 50%
Statkraft 50%
[w 20]
Teesside 62 27 × Siemens SWT-2.3 54°38′50″N 1°05′40″W / 54.64722°N 1.09444°W England 2013 August £200m 34.8% 7–15 1.5 EDF-EN [25]
Thanet 300 100 × Vestas V90-3.0MW 51°26′0″N 1°38′0″E / 51.43333°N 1.63333°E England 2010 September £900m 32.8% 20–25 11 Vattenfall [w 21][26]
Walney 367 102 Siemens SWP 3.6–107 54°03′00″N 3°31′00″W / 54.05000°N 3.51667°W England 2010 February £630m 40.5%, 43.8%[4] 19–30 14 Ørsted, SSE, OPW [w 22][27]
Walney Extension 659 47 × Siemens SWT-7.0-154, 40 × MHI Vestas V164-8.25 MW 54°5′17″N 3°44′17″W / 54.08806°N 3.73806°W England 2018 September Ørsted [28][29]
Westermost Rough 210 35 Siemens SWT-6.0–154 53°48′18″N 0°8′56″E / 53.80500°N 0.14889°E England 2015 May £370m 42.9%[4] 15 10 Ørsted, Marubeni, GIB [w 23][30]
West of Duddon Sands 389 108 Siemens SWP 3.6–120 53°59′00″N 3°28′00″W / 53.98333°N 3.46667°W England 2014 October £1,600m 44.2%[4] 17–24 15 Ørsted, Scottish Power [w 24][31]
  • "Cap." is the rated nameplate capacity of the wind farm
  • "Cost" is the total capital cost of the project up to commissioning.
  • "Cap. Fac." is the average capacity factor, i.e. the average power generated by the windfarm, as a percentage of its nameplate capacity.
  • "km to shore" is the average distance of the windfarm to shore, or (where available) the distance from the in-farm transformer/substation to the shore
  • "Depth range (m)" is the range of minimum to maximum depths of water that the windfarm is sited in
  • "Refs" cite the source references for the information. The [w ...] footnotes link to each windfarm's own home page
List of offshore wind farms in the United Kingdom is located in the United Kingdom
Barrow
Barrow
Beatrice
Beatrice
Blyth
Blyth
Burbo Bank
Burbo Bank
European Offshore Wind Deployment Centre
European Offshore Wind Deployment Centre
Greater Gabbard
Greater Gabbard
Gunfleet Sands
Gunfleet Sands
Gwynt y Môr
Gwynt y Môr
Humber Gateway
Humber Gateway
Hywind Scotland
Hywind Scotland
Kentish Flats
Kentish Flats
Lincs
Lincs
London Array
London Array
Lynn and Inner Dowsing
Lynn and Inner Dowsing
Methil
Methil
North Hoyle
North Hoyle
Ormonde
Ormonde
Rhyl Flats
Rhyl Flats
Robin Rigg
Robin Rigg
Scroby Sands
Scroby Sands
Sheringham Shoal
Sheringham Shoal
Teesside
Teesside
Thanet
Thanet
Walney
Walney
Westermost Rough
Westermost Rough
West of Duddon Sands
West of Duddon Sands
Rampion
Rampion
Locations of offshore wind farms in the United Kingdom

Wind farms under construction

This is a list of offshore wind farms currently under construction.

Name Cap.
(MW)
Turbines Location Country Project commissioning Build
Cost
Cap.
fac.
Depth
range (m)
km to
shore
Owner Refs.
East Anglia One 714 102 2020 [32]
Hornsea One 1218 174 53°53′06″N 01°47′28″E / 53.88500°N 1.79111°E England 2020 £ 25-30 120 Ørsted (company) and Global Infrastructure Partners [33]
Hornsea Two 1386 165 53°53′06″N 01°47′28″E / 53.88500°N 1.79111°E England 2022 £ 25-30 120 Ørsted (company) and Global Infrastructure Partners [34]
Moray East 950 2023 [35][36]
Triton Knoll 860 53°4′00″N 0°09′0″E / 53.06667°N 0.15000°E 2021 [37]

See also

Notes

  1. ^ The Windpower database
  2. ^ Interactive Map of Renewable and Alternative Energy Projects in the UK
  3. ^ OffshoreDevelopment Rounds Archived 2014-02-01 at the Wayback Machine, RenewableUK
  4. ^ a b c d e f g h i j k l "UK offshore wind capacity factors". 27 January 2017. Archived from the original on 19 February 2017. Retrieved 19 February 2017.
  5. ^ Barrow Offshore Wind Farm (UK) 4C . Retrieved: 9 February 2015.
  6. ^ Beatrice offshore wind farm (United Kingdom) 4C . Retrieved: 27 October 2010.
  7. ^ Beatrice extension Retrieved: 27 October 2010.
  8. ^ Royal Opening for Scotland's Largest Offshore Wind Farm Retrieved: 17 August 2019.
  9. ^ Burbo Bank Offshore Wind Farm (United Kingdom) 4C . Retrieved: 7 November 2010.
  10. ^ Dudgeon Wind Farm project page
  11. ^ Dudgeon 4C .
  12. ^ "Aberdeen offshore wind project opposed by Trump officially opening". BBC News. NE Scotland, Orkney & Shetland. 7 September 2018. Retrieved 9 September 2018.
  13. ^ Gunfleet Sands offshore wind farm (United Kingdom) 4C . Retrieved: 27 October 2010.
  14. ^ Kentish Flats offshore wind farm (United Kingdom) 4C . Retrieved: 27 October 2010.
  15. ^ Lincs Offshore Wind Farm (United Kingdom) 4C . Retrieved: January 2015.
  16. ^ Lynn Inner Dowsing offshore wind farm (United Kingdom) 4C . Retrieved: 25 October 2010.
  17. ^ North Hoyle Offshore Wind Farm (United Kingdom) 4C . Retrieved: 7 November 2010.
  18. ^ Ormonde (UK) offshore wind farm 4C . Retrieved: 9 February 2015.
  19. ^ Race Bank Wind Farm project page Archived 2016-01-16 at the Wayback Machine
  20. ^ Rampion Wind Farm project page
  21. ^ Rampion 4C .
  22. ^ Rhyl Flats Offshore Wind Farm (United Kingdom) 4C . Retrieved: 7 November 2010.
  23. ^ Robin Rigg Offshore Wind Farm (United Kingdom) 4C . Retrieved: 7 November 2010.
  24. ^ Scroby Sands offshore wind farm (United Kingdom) 4C . Retrieved: 27 October 2010.
  25. ^ Teesside offshore wind farm (United Kingdom) 4C . Retrieved: 11 February 2015.
  26. ^ Thanet Offshore Wind Farm (United Kingdom) 4C . Retrieved: 24 September 2010.
  27. ^ Walney 1, Walney 2 4C . Retrieved: 9 February 2015.
  28. ^ Walney Extension Wind Farm project page
  29. ^ Walney Extension 4C .
  30. ^ "GIB, Marubeni rejig Rough cash". RENews. 11 August 2011.
  31. ^ West of Duddon Sands (UK) offshore wind farm 4C . Retrieved: 9 February 2015.
  32. ^ Crown Estate - Offshore Wind Operational Report Retrieved: 17 August 2019.
  33. ^ Hornsea One, the biggest offshore wind farm in the world Retrieved: 15 December 2018.
  34. ^ Hornsea Two Offshore Wind Farm Retrieved: 17 Aug 2019.
  35. ^ Crown Estate - Offshore Wind Operational Report Retrieved: 17 August 2019.
  36. ^ 4C Offshore - Moray East
  37. ^ Crown Estate - Offshore Wind Operational Report Retrieved: 17 August 2019.

External links

Wind farms

  1. ^ Barrow Offshore Wind Farm
  2. ^ Beatrice
  3. ^ Burbo Bank
  4. ^ EOWDC website
  5. ^ SSE wind farm Project Website
  6. ^ Gunfleet Sands
  7. ^ Gunfleet Sands demonstration project Archived 2015-02-03 at the Wayback Machine
  8. ^ Gwynt y Môr
  9. ^ Humber Gateway
  10. ^ Kentish Flats
  11. ^ Lincs Archived 2015-02-13 at the Wayback Machine
  12. ^ London Array
  13. ^ Lynn and Inner Dowsing Archived 2015-02-12 at the Wayback Machine
  14. ^ Energy Park Fife (Methil)
  15. ^ North Hoyle
  16. ^ Ormonde, Irish Sea
  17. ^ Rhyl Flats
  18. ^ Robin Rigg
  19. ^ Scroby Sands
  20. ^ Statkraft – Sheringham Shoal
  21. ^ Thanet
  22. ^ Walney Offshore Windfarm
  23. ^ Westermost Rough Archived 2015-02-27 at the Wayback Machine
  24. ^ West of Duddon Sands
Barrow Offshore Wind Farm

The Barrow Offshore Wind Farm is a 30 turbine 90MW capacity offshore wind farm in the East Irish Sea approximately 7 kilometres (4.3 mi) south west of Walney Island, near Barrow-in-Furness, Cumbria, England.

Construction of the wind farm took place between 2005 and 2006. The farm is operated by Barrow Offshore Wind Limited, owned by Dong Energy.

Beatrice Wind Farm

The Beatrice Offshore Wind Farm now known as Beatrice Offshore Windfarm Ltd (BOWL) project, is a wind farm close to the Beatrice oil field in the Moray Firth, part of the North Sea 13 km off the north east coast of Scotland.

Burbo Bank Offshore Wind Farm

The Burbo Bank Offshore Wind Farm is a 348 MW offshore wind farm located on the Burbo Flats in Liverpool Bay on the west coast of the UK in the Irish Sea. It consists of an original 90 MW wind farm commissioned in 2007 and a 258 MW extension completed in 2017.

The wind farm was developed in the 2000s by SeaScape Energy, which was acquired by DONG Energy (now Ørsted A/S) in 2005. A 25 turbine installation using Siemens Wind Power 3.6 MW turbines was constructed from 2005, and officially opened in 2007. A further 32 8 MW turbines were constructed in 2016–17.

Clyde Wind Farm

The Clyde Wind Farm is a 522 megawatt (MW) wind farm near Abington in South Lanarkshire, Scotland.

European Offshore Wind Deployment Centre

The European Offshore Wind Deployment Centre (EOWDC) is an offshore wind test and demonstration facility located around 3 kilometres off the east coast of Aberdeenshire, in the North Sea, Scotland. It was developed by the European Offshore Wind Deployment Centre consortium. The scheme consists of 11 wind turbines with an installed capacity of 93.2 megawatts. It is located between Blackdog and Bridge of Don near Aberdeen. First power was generated in July 2018, with full commissioning following in September 2018.

Greater Gabbard wind farm

Greater Gabbard is a 504 MW wind farm on sandbanks 23 kilometres (14 mi) off the coast of Suffolk in England at a cost of £1.5 billion. Onshore construction activities commenced in early July 2008 at Sizewell. It was completed on 7 September 2012 with all of the Siemens SWT3.6–107 turbines connected.A 336 MW extension of the project called Galloper Wind Farm was commissioned in April 2018.

Gunfleet Sands Offshore Wind Farm

Gunfleet Sands Offshore Wind Farm is a 172 MW wind farm about 7 kilometres (4.3 mi) off the Clacton-on-Sea coast in the Northern Thames Estuary.

The 108MW Gunfleet Sands 1 wind farm gained planning consent in 2003/4; in 2006 Dong Energy (now Ørsted) acquired the project and submitted an application for a second 64MW windfarm Gunfleet Sands 2 adjacent to the first, which received consent in 2008. Construction of both wind farms using Siemens Wind Power SWT-3.6-107 took place between 2008 and 2010.

In 2010 planning began on a demonstration project Gunfleet Sands 3, used to test Siemens' 6MW wind turbine model; two 6MW turbines were installed in 2013.

Gwynt y Môr

Gwynt y Môr (English: Sea Wind) is a 576-megawatt (MW) offshore wind farm located off the coast of North Wales and is the fourth largest operating offshore windfarm in the world. The farm has 160 wind turbines of 150 metres (490 ft) tip height above mean sea level.Planning consent for the project was granted on 3 December 2008. The project has a value of 2 billion Euros, of which 1.2 billion Euros were spent on turbines and electrical connections. Construction began in 2012, power production started in September 2013, construction phase ended in November 2014, and final commissioning occurred in June 2015.

Kentish Flats Offshore Wind Farm

The Kentish Flats Offshore Wind Farm is a wind farm located off the coast of Kent, England on a large, flat and shallow plateau just outside the main Thames shipping lanes. The wind farm is operated by Vattenfall.

Lists of offshore wind farms by country

Lists of offshore wind farms by country include:

List of offshore wind farms in China

List of offshore wind farms in Denmark

List of offshore wind farms in Germany

List of offshore wind farms in Japan

List of offshore wind farms in the Netherlands

List of offshore wind farms in Sweden

List of offshore wind farms in the United Kingdom

List of offshore wind farms in the United States

London Array

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.

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, David Cameron on 4 July 2013.

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

Lynn and Inner Dowsing Wind Farms

The Lynn and Inner Dowsing wind farms are a pair of round 1 wind farms located in the North Sea, in the shallow waters at the entrance to The Wash off the coast of Lincolnshire, England. The wind farms were developed as a single unit after planning consent was given in 2003. Construction work began in 2006 and was completed in 2009.

The farm has a maximum output of 194MW from 54 Siemens Wind Power 3.6-107 turbines with a generating capacity of 194 MW. The capacity factor of the farm has been 31 to 36%.

North Hoyle Offshore Wind Farm

North Hoyle Offshore Wind Farm is Wales' first offshore wind farm, and the UK's first major offshore renewable power project. Situated in Liverpool Bay, it commenced operation in 2003.

The first of the UK's Round 1 offshore wind farms, North Hoyle covers an area of 10 square kilometres (3.9 sq mi), and is located approximately 7.5 kilometres (4.7 mi) off the coast of North Wales, between the towns of Rhyl and Prestatyn. The Round 1 projects were intended to act as testbeds; building the UK's understanding of offshore wind power, whilst in total also providing well over 1,000 MW of green generating capacity for the UK. All of the Round 1 offshore wind farms were limited to a maximum area of 10 square kilometres (3.9 sq mi), and no more than 30 wind turbines.

The wind farm's 30 Vestas V80 Offshore wind turbines are each rated at 2 MW capacity, giving a maximum project output of 60 MW. At the time of installation this was the most powerful wind farm in the UK, producing sufficient electricity annually to power 50,000 homes.

Between 2004 and 2010, the capacity factor was between 33 and 36%.Independent surveys carried out for the operators of North Hoyle have shown that the wind farm is very popular among holidaymakers and local residents. An opinion poll carried out in 2003, after its construction, showed that 73% of people expressed support for the project and only 5% opposed it.North Hoyle was developed, built and is operated by RWE npower renewables (formerly National Wind Power); npower renewables also own the neighbouring Rhyl Flats and Gwynt y Môr offshore wind farms.

Rampion Wind Farm

Rampion is an offshore wind farm development by E.ON, off the Sussex coast in the UK. The wind farm has a capacity of 400 MW (originally 700 MW were planned). The wind farm was commissioned in April 2018.

Rhyl Flats

Rhyl Flats Offshore Wind Farm is a 25 turbine wind farm approximately 8 km north east of Llandudno in North Wales. It is Wales' second offshore wind farm and the third offshore wind farm to be built within Liverpool Bay. It has a maximum rated output of 90 MW.

Robin Rigg Wind Farm

Robin Rigg Wind Farm, Scotland's first offshore wind farm, was constructed by E.ON at Robin Rigg in the Solway Firth, a sandbank midway between the Galloway and Cumbrian coasts. The windfarm first generated power for test purposes on 9 September 2009. The wind farm was completed on 20 April 2010.

Scroby Sands Wind Farm

The Scroby Sands Wind Farm is a wind farm located on the Scroby Sands sandbank in the North Sea, 2.5 kilometres (1.6 mi) off the coast of Great Yarmouth in eastern England, United Kingdom. It was commissioned in March 2004 by Powergen Renewables Offshore, a division of E.ON UK. It has a nameplate capacity of 60 megawatts and is able to produce power to supply 41,000 households. Between 2005 and 2010, its capacity factor was between 26 and 32%.The farm consists of 30 wind turbines, located in water from 13 to 20 metres (43 to 66 ft) deep. Each turbine has three 40-metre (130 ft) blades that rotate around a centre-point some 60 metres (200 ft) above the mean sea level. The hollow 4.5-metre (14.8 ft) diameter steel masts that carry the turbines are piled as much as 30 metres (98 ft) into the sea bed, to provide stability on a substrate of shifting sands.

The wind turbines were designed and manufactured by a Danish firm, Vestas. Each turbine has a capacity of 2 megawatts. Turbines were installed by the Danish offshore wind farms services provider A2SEA.

Thanet Wind Farm

The Thanet Wind Farm (also sometimes called Thanet Offshore Wind Farm) is an offshore wind farm 7 miles (11 km) off the coast of Thanet district in Kent, England. On commissioning it was the world's largest offshore wind farm. It has a nameplate capacity (maximum output) of 300 MW and it cost £780–900 million (US$1.2–1.4 billion). Thanet is one of fifteen Round 2 wind projects announced by the Crown Estate in January 2004 but the first to be developed. It was officially opened on 23 September 2010, when it overtook Horns Rev 2 as the biggest offshore wind farm in the world. It has since been overtaken by many others (medio 2017 it ranks 14th).

Walney Wind Farm

Walney Wind Farms are a group of offshore wind farms 9 miles (14 km) west of Walney Island off the coast of Cumbria, in the Irish Sea, England. The group, operated by Ørsted (formerly Dong Energy), consists of Walney Phase 1, Phase 2 and the Walney Extension.

The extension has a capacity of 659 MW making it the world's largest offshore wind farm.The wind farms were developed by Walney (UK) Offshore Windfarms Limited, a partnership between DONG Energy and Scottish and Southern Energy. The farms, which are immediately northwest of the West of Duddon Sands Wind Farm and west of Ormonde Wind Farm, are in water depths ranging from 19m to 23m and cover an area of approximately 73 km2.

Both of the first phases have 51 turbines giving a nameplate capacity of 367 MW. Until September 2012 it was the world's largest operational offshore wind farm, and regained this title when the expansion completed in September 2018. The first two phases were expected to generate about 1,300 GW·h/year of electricity, with a load factor of 43%. The Walney Extension opened in September 2018 with a further 87 turbines capable of generating 659 megawatts.

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