Hornsea Wind Farm

Hornsea Wind Farm is a Round 3 wind farm under construction[1] in the North Sea off the coast of England. The wind farm is planned to have a total capacity of up to 6 gigawatt (GW).

Hornsea Wind Farm
Hornsea wind farm from Barmston beach
CountryEngland, United Kingdom (offshore)
LocationNorth Sea
Coordinates53.885°N 1.791°E / 53.885; 1.791
StatusUnder construction
Owner(s)Ørsted
Wind farm
TypeMarine
Power generation
Nameplate capacityProject 1 : 1.2 GW
Project 2 : 1.8 GW
External links
Websitehornseaproject3.co.uk
CommonsRelated media on Commons

The development has been split into a number of subzones. The 1.2 GW Project 1 gained planning consent in 2014; a second 1.4 GW Project 2 was given planning consent in 2016. In 2016 a third subzone was split into two projects Hornsea 3 and 4, with approximate capacities of 1–2 GW and 1 GW, increasing the capacity of the developed project to a maximum of 6 GW.

Construction of the first phase started in January 2018,[2] and the first turbines began supplying power to the UK national electricity grid in February 2019.[3]

History

The tendering process for Round 3 offshore wind farm opportunities was begun by the Crown Estate in 2008. Bids were received in March 2009, and Zone Development Agreements signed in December 2009.[4] The Hornsea development zone was awarded to a joint venture (SMart Wind) of Siemens and a consortium Mainstream Renewable Power including Hochtief. The development had an estimated potential generating capacity of 4 GW.[5]

The Hornsea site is one of three off the British coast in the North Sea, roughly halfway between the other two: Dogger Bank Wind Farm and East Anglia Wind Farm.[6] The Hornsea site ('Zone 4', also known as 'Holderness' zone) has a total area of 4,730 square kilometres (1,830 sq mi), and is 38 kilometres (24 mi) from land at the closest point; water depth in the zone is from 22 to 73 metres (72 to 240 ft), with a tidal range of 2 to 5 metres (6 ft 7 in to 16 ft 5 in), and typical annual wave height of 1.35 to 1.78 metres (4 ft 5 in to 5 ft 10 in). The surface of the seabed consists primarily of sands and gravel.[7]

In 2011 the Danish firm Ørsted A/S (then named DONG Energy) became a partner in SMart Wind.[8] In early 2015 Ørsted A/S 100% owner of the first phase, Project 1, of the scheme.[8] Ørsted acquired rights to the remaining subzones of the Hornsea development (2 & 3) by August 2015.[9]

In 2016 Ørsted reached an agreement with the Crown Estate for amended plans for the Hornsea Two and Hornsea Three phases. Hornsea Three was split into two new projects, Hornsea Three and Hornsea Four; the new phases were expected to be developed in the 2020s.[10] The changes increased the potential generating capacity of the wind farm to 6 GW, with Hornsea Three estimated at 1–2 GW and Hornsea Four at about 1 GW.[11][12]

In 2019 the failure of the plant was partially responsible for a large scale nationwide power cut on the evening of 9 August.[13]

Hornsea Project 1

The initial scoping report for "Project One" within the Hornsea zone identified it as a subzone of 629.6 square kilometres (243.1 sq mi) in the centre of the Hornsea zone, with an estimated potential wind farm of 1.2 GW, divided into two further subzones of 600 MW capacity each. The zone was to connect to an existing 400 kV National Grid substation at Killingholme.[14] A variety of configurations were considered – foundations of pile jacket, monopile or gravity base; turbines from 3.6 to 8 MW rated power; with electrical power export by HVDC.[15] Later DONG Energy added the consideration to use HVAC export cables.[16] The chosen cable export was planned to make landfall at Horsehoe Point (northeast of Marshchapel, East Lindsey), then passing 40 kilometres (25 mi) west and northwest to a substation near Killingholme Power Station, North Killingholme in North Lincolnshire.[17]

Within the zone of Project 1 the primary underlying geology consisted of deposits from the Quaternary Period consisting of Bolders bank, Botney Cut and Eem formations – primarily sediments or tills – gravelley/sandy clays, overlying sediments were sands or gravels up to 2 to 3 metres (6 ft 7 in to 9 ft 10 in) thick, with for sandwaves within the area varying in height by 1 to 3 metres (3 ft 3 in to 9 ft 10 in). Project 1 water depths were generally 25 to 30 metres (82 to 98 ft).[18]

In 2011 Smart Wind signed lease agreements with the Crown Estate for "Heron Wind" and "Njord" areas making up the zone.[19] The zone was given provisional contract for difference renewable subsidies by the UK government in April 2014.[20] Hornsea Project 1 was given planning consent in December 2014.[21] The 'contract for difference' strike price was £140 per MWh.[22] In early 2015 DONG acquired all of the project, becoming 100% owner.[8]

Seabed investigation including boreholes at turbine foundation positions was completed by Fugro by April 2015.[23] In mid 2015 DONG selected Siemens Wind Power 7 MW turbines with 154 metres (505 ft) rotor turbines for the project – around 171 turbines would be used for the wind farm.[24] In its 2015 financial report DONG stated it had chosen to use suction bucket foundations on a third of the turbines at Hornsea.[25] The rationale for use of the new foundation type is thought to be a simplified foundation installation, requiring only a heavy-lift crane to lower the foundation to the sea bed, reducing costs.[26][note 1]

DONG Energy formally committed to building the wind farm in early 2016. The expected completion date for the project was 2020.[27][28] A £25 million contract to construct the onshore substation at North Killingholme had been awarded to Balfour Beatty in late 2015.[29]

NKT Cables and ABB were awarded €139 (c. $158) million and $250 million contracts to supply 220 kV AC export cables in March/April 2016.[30][31] In late 2016 JDR Cables was contracted to supply 242 kilometres (150 mi) of inter-array subsea power cables for the wind farm;[32] Nexans was awarded a contract for 139 kilometres (86 mi) of inter-array cables;[33] and EEW was awarded a contract to supply 116 monopiles.[34] Bladt Industries/Offshore Structures (Britain) Ltd. was awarded a contract for 96 tower transition pieces in early 2017, to be constructed at Aalborg, Denmark and Billingham, UK.[35]

Construction

Construction of the onshore cable route was begun in late 2016 under J. Murphy & Sons.[36] The wind farm was scheduled to be constructed between 2018 and 2020, and expected to provide an annual production of around 4.1 terawatt-hours (TWh).[26]

The first foundation of the new windpark was installed by DEME Group's subsidiary GeoSea in January 2018.[2] The export cables were installed by Tideway Offshore Solutions, a subsidiary company of the Belgian DEME Group. The installation was completed in December 2018, several months ahead of schedule.[37]

Hornsea 1 began supplying power to the UK national electricity grid in February 2019,[38][3] with full completion expected in the first quarter of 2020.[39] The final monopile foundation was completed in April 2019 and as of 3 May 2019, 28 turbines out of 174 had been installed.[40][41]

At 16:52:33 on Friday 9 August 2019, lightning struck a 400 kV mainland transmission line between Eaton Socon and Wymondley north of London, causing small generators, Little Barford Power Station (641 MW) and Hornsea (737 MW) to unexpectedly disconnect a combined 1,878 MW (1,691 MW maximum single-time) supply within minutes, greater than the 1,000 MW limit. Grid frequency declined to 48.8 Hz, below the limit at 49.5 Hz, and 1.1 million customers were disconnected; rail services were disrupted with 371 trains cancelled, 220 part cancelled, and 873 trains delayed. Power was restored at 17:37.[42] Hornsea disconnected due to a software flaw, which was fixed the next day.[43]

The final turbine was installed in October 2019 and the project is expected to complete in early 2020.[44][45]

Hornsea Project 2

A scoping report for "Project Two" was published in October 2012.[46] The subzone was expected to be developed in a number of phases, with a potential wind turbine capacity of 1.8 GW, in an area of around 400 square kilometres (150 sq mi) located in the centre of the Hornsea wind farm zone. Project 2 was use the same route for its electrical export cable as Project One, and to use either HVAC or HVDC with a separate onshore substation.[47] Suitable areas for the Project 2 development were identified as being adjacent to the north, east or west of the Zone 1, which was located in the shallowest area of the whole Hornsea zone.[48] The design considered piled, suction pile, monopile or gravity base foundations for wind turbines of 5 to 15 MW rated power.[49]

As with Project 1 sea bed conditions and geology consisted of Quaternary period deposits, primarily sediments of sand, till and clays, with the overlying gravel or sand seabed including sandwaves, with the average water depth of 25 to 30 metres (82 to 98 ft).[50]

In 2013 SMart wind signed lease agreements with the Crown Estate for the "Optimus Wind" and "Breesea" areas making up Project 2 of Hornsea wind farm.[19] A planning application for Project 2 was submitted and accepted for examination in early 2015;[51] its wind turbine area was located adjacent northwest of the Project 1 area, with the cable export route following that of Project 1 adjacent on the northward side.[52] Planning permission for the development was awarded in August 2016,[53] for 300 turbines covering 300 square miles (780 km2) at a height of 620 feet (190 m) each. At the time of the award, Dong had committed to building 174 turbines, but the whole project is the biggest marine wind farm in the world.[54]

Turbine installation is expected to commence in 2021. When operational in 2022, Hornsea Project 2 will be the biggest offshore wind farm in the world.[55]

Hornsea Project 3

DONG Energy (which in November 2017 changed its name to Ørsted[56]) began consultation on the project three development in May 2016.[57] Project 3 will be to the east of Projects 1 and 2, with an estimated maximum capacity of 2.4 GW over 696 square kilometres (269 sq mi). Ørsted submitted a Development consent application in 2018, with a decision on the project expected to be made during July 2020.[58] The project is expected to begin construction in 2022, and be completed by 2025.[59]

Hornsea Project 4

Ørsted put forward a plan to add a fourth area to the Hornsea wind farm in 2018, with the area covering 600 square kilometres (230 sq mi), and being located adjacent, north-west of Hornsea Project 1. During 2018 and 2019, consultation with the local communities which will be effected by the project occurred, with a Development Consent Order application being expected to occur during the first quarter of 2020.[60] Construction of the wind farm is expected to start in 2023, and be operational by 2027, at the earliest.[61] The project's capacity is unknown by Ørsted due to the ever increasing size of available wind turbines for the project.

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See also

Notes
  1. Suction bucket with jacket foundations were tested at Borkum Riffgrund.[26]

References
  1. "Construction begins for UK's 1.2GW Hornsea Project One windfarm - Power Technology". Power Technology. 29 January 2018. Retrieved 18 March 2018.
  2. "Ørsted begins offshore construction for Hornsea Project One". orsted.co.uk. 26 January 2018. Retrieved 31 January 2018.
  3. "First power from world's biggest wind farm". 15 February 2019. Retrieved 17 February 2019.
  4. Crown Estate 2010, §1.1.
  5. Fineren, Daniel; Nakanishi, Nao (8 January 2010). "Winners of UK Round 3 offshore wind farm projects". Reuters. Retrieved 27 January 2016.
  6. Crown Estate 2013, p. 10.
  7. ABP mer 2009, §6.
  8. "Dong takes control at Hornsea 1". renews.biz. 4 February 2015. Retrieved 27 January 2016.
  9. "Dong grabs Hornsea zone". renews.biz. 21 August 2015. Retrieved 27 January 2016.
  10. "UK's offshore wind project pipeline further strengthened". www.thecrownestate.co.uk (Press release). 8 March 2016. Retrieved 8 March 2016.
  11. "Dong eyes 2GW Hornsea bonus". renews.biz. Retrieved 8 March 2016.
  12. "DONG Energy reaches agreement with The Crown Estate for Hornsea zone" (Press release). Dong Energy. 8 March 2016. Retrieved 8 March 2016.
  13. "UK power cut: Andrea Leadsom launches government investigation". BBC News. BBC. 11 August 2019. Retrieved 12 August 2019.
  14. SMart Wind 2010, §1.1–1.4.
  15. SMart Wind 2010, §3.29–3.55.
  16. SMart Wind 2012, §1.2.
  17. SMart Wind 2013, §5.1.5–5.1.8, Fig 5.1.
  18. SMart Wind 2010, §5.2–5.14, §5.15–5.18.
  19. "Hornsea duo signs on dotted line". renews.biz. 24 April 2013. Retrieved 27 January 2016.
  20. "UK awards contracts for 4.5GW". renews.biz. 23 April 2014. Archived from the original on 20 February 2016. Retrieved 27 January 2016.
  21. "1.2GW Hornsea 1 green light". renews.biz. 10 December 2014. Retrieved 27 January 2016.
  22. "State aid SA.38758 (2014/N), SA.38759 (2014/N), SA.38761 (2014/N), SA.38763 (2014/N) & SA.38812 (2014/N) – United Kingdom – Support for five Offshore Wind Farms: Walney, Dudgeon, Hornsea, Burbo Bank and Beatrice" (PDF). European Commission. 23 July 2014. Table 2, pp.4–5. Retrieved 3 February 2016.
  23. "Fugro signs off at Hornsea 1". renews.biz. 23 March 2015. Retrieved 27 January 2016.
  24. "Siemens 1.2GW monster order". renews.biz. 3 July 2015. Retrieved 27 January 2016.
  25. "Financial report full year 2015 – Investor Presentation" (PDF). DONG Energy. 4 February 2016. p. 6. Retrieved 16 February 2016.
  26. "Nyt havmøllefundament skal stå sin prøve i gigantisk havmøllepark" [New offshore wind foundation to be tested at giant offshore wind farm]. ing.dk (in Danish). 5 February 2016. Retrieved 5 February 2016.
  27. "Dong commits to Hornsea build". renews.biz. 3 February 2016. Retrieved 3 February 2016.
  28. "World's largest offshore wind farm to be built in the UK" (Press release). Department of Energy and Climate Change. 3 February 2016. Retrieved 3 February 2016.
  29. "Balfour grabs Hornsea gig". renews.biz. 15 December 2015. Retrieved 27 January 2016.
  30. "ABB wins Hornsea gem". renews.biz. 31 March 2016. Retrieved 31 March 2016.
  31. "NKT to help wire Hornsea 1". renews.biz. 5 April 2016. Retrieved 5 April 2016.
  32. "JDR Strikes Gold with Hornsea Project One Contract". www.offshorewind.biz. 1 November 2016. Retrieved 1 November 2016.
  33. "Nexans nails Hornsea 1 wire job". renews.biz. 14 December 2016. Retrieved 5 January 2017.
  34. "EEW secures Hornsea prize". renews.biz. 25 November 2016. Retrieved 5 January 2017.
  35. "Bladt, OSB secure Hornsea prize". renews.biz. 5 January 2017. Retrieved 5 January 2017.
  36. "Hornsea 1 starts onshore links". renews.biz. 3 November 2016. Retrieved 3 November 2016.
  37. "Hornsea One Export Cable Installation Completed". Offshore Engineer Magazine. 11 December 2018. Retrieved 12 February 2019.
  38. Vaughan, Adam (11 February 2019). "Biggest offshore windfarm to start UK supply this week". The Guardian. Retrieved 12 February 2019.
  39. "World's Largest Offshore Wind Farm Hornsea One Generates First Power". Retrieved 18 February 2019.
  40. "Hornsea One Foundations All In Place". Offshore Wind. 26 April 2019. Retrieved 28 June 2019.
  41. "Bold Tern Installs Turbine 28 at Hornsea One". Offshore Wind. 3 May 2019. Retrieved 28 June 2019.
  42. "Technical Report on the events of 9 August 2019". 6 September 2019. Retrieved 6 October 2019.
  43. "Appendices to the Technical Report on the events of 9 August 2019, Appendix D". 6 September 2019. p. 42. Retrieved 6 October 2019.
  44. Shrestha, Priyanka (3 October 2019). "Final turbine installed at 'world's largest' offshore wind farm". Energy Live News. Retrieved 6 October 2019.
  45. "Construction of world's largest offshore wind farm in the UK, nearly complete". Retrieved 11 February 2020.
  46. SMart Wind 2012a.
  47. SMart Wind 2012a, §1.1.1–1.1.5, §3.3.10–3.311.
  48. SMart Wind 2012a, §3.3.7.
  49. SMart Wind 2012a, §3.4.7–3.4.14.
  50. SMart Wind 2012a, §5.1.2–5.1.11.
  51. "Hornsea Offshore Wind Farm (Zone 4) – Project 2 application accepted for examination" (Press release). Planning Inspectorate. 20 February 2015. Retrieved 27 January 2016.
  52. SMart Wind 2015.
  53. Proctor, Kate; Woof, Alex (16 August 2016). "Green-lit: World's largest offshore wind farm, just off the Yorkshire coast". The Yorkshire Post. Retrieved 16 August 2016.
  54. Pagnamenta, Robin (17 August 2016). "Biggest offshore wind farm gets the go-ahead". The Times (71991). p. 9. ISSN 0140-0460.
  55. Richard, Craig. "Siemens Gamesa signs Hornsea Project Two deal". www.windpoweroffshore.com. Retrieved 16 December 2018.
  56. "Ørsted: A new beginning". Ørsted. Retrieved 1 May 2018.
  57. "Consultation starts over Hornsea's third offshore wind farm". BBC News Humberside. 4 May 2016. Retrieved 4 May 2016.
  58. "About the project". Hornsea Project Three. Retrieved 2 August 2020.
  59. "DONG Energy starts consultation on world's biggest potential offshore wind farm" (Press release). Dong Energy. 4 May 2016. Archived from the original on 8 May 2016. Retrieved 4 May 2016.
  60. "About the project". Hornsea Project Four. Ørsted. Retrieved 2 August 2020.
  61. "Hornsea Project Four Offshore Wind Farm". Ørsted. Retrieved 2 August 2020.

Sources
Zone 1
Zone 2
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