HomeBiggest projectsHornsea Wind Farm Project Timeline and All You Need To Know.

Hornsea Wind Farm Project Timeline and All You Need To Know.

Hornsea Wind Farm is an under construction Round 3 wind farm located in the North Sea, 120 km from the east coast of England. The wind farm started started construction in 2018. The first phase completed in January 2021, with a capacity of 1,218 MW making it the biggest in the world on its completion. Located in the North Sea 120 km from the east coast of England, the eventual wind farm group is set to have a total capacity of around to 6 gigawatt (GW). The scheme has been dividend into a number of phases. The 1.2 GW Project 1 received planning consent in 2014, the 1.4 GW Project 2 was later given planning consent in 2016. Also in 2016, a third phase was further spilt into two phases Hornsea 3 and 4, having approximate capacities of 1–2 GW and 1 GW, that increased the capacity of the developed project to a maximum of 6 GW.

The Hornsea site is part of three off the British coast found in the North Sea, around halfway between Dogger Bank Wind Farm and East Anglia Wind Farm. The Hornsea site has a total area of 4,730 square kilometres and is 38 kilometres from the land at closest point; water depth in the zone is from 22 to 73 metres, having a tidal range of 2 to 5 metres and typical annual wave height of 1.35 to 1.78 metres. The surface of the seabed primarily contains sands and gravel. Back in 2011, the Danish firm Ørsted A/S, earlier DONG Energy became a partner in SMart Wind. Later in 2015 Ørsted A/S were the 100% owner of the project’s first phase, Project 1. Ørsted acquired rights to the remaining phases of the Hornsea development (2 & 3) by 2015 August. In the next year, 2016, Ørsted arrived to an agreement with the Crown Estate for the Hornsea Two and Hornsea Three phases amended plans. This is when Hornsea Three was split into two new projects and the new phases were set to be developed in the 2020s.

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Hornsea Wind Farm Timeline.

Hornsea Project Two wind farm consists of 165 Siemens Gamesa 8.0-167 DD turbines.



Construction of the onshore cable route begun under J. Murphy & Sons. The wind farm was planned to be constructed between 2018 and 2020, and set to provide an annual production of around 4.1 terawatt-hours (TWh).


The new windpark first foundation was developed by DEME Group‘s subsidiary GeoSea in January. A subsidiary company of the Belgian DEME Group, Tideway Offshore Solutions installed the export cables. The installation work completed in December 2018, months ahead of schedule.


Hornsea 1 started supplying power to the UK national electricity grid in February with full completion set in the first quarter of 2020. The final monopile foundation was completed in April and as of 3 May, 28 turbines out of 174 were installed. The last turbine was installed in October 2019 and the scheme was completed in early 2020.


The construction commenced. The selected area was to the east and north of Hornsea One and the specification was set as 165 8 MW turbines offering a rated capacity of 1.4 GW.


As of April, a third of the turbine foundations was installed and the remaining turbines are set to be fixed on the second half of the year. When operational in 2022, Hornsea Project 2 will take over from Hornsea One as the largest offshore wind farm in the world. The first turbine was installed by the end of May and on 23 June Ørsted revealed that the 16th turbine to be installed to the Hornsea Two array was the 1,000th turbine they had fixed in UK waters, fifteen years since they installed their first.

In October, Ørsted completed the installation of the Hornsea Two Offshore Substation and all 165 wind turbine foundations in the North Sea.

December 2021.
The Hornsea Two generated its first power. Orsted’s latest scheme reached the milestone after the installation of the substation and some other major infrastructure offshore. The Hornsea Two programme director, Patrick Harnett, stated: “Achieving first power is an significant milestone for the project and a great moment for the whole team. Developing a project of such size and scale can only be possible when there is a strong collaboration, hard work and dedication. From here, we can see the finish line as we install the turbines remaining and as well as testing, commissioning and energising the wind farm into the new year.”


The project is expected to begin construction in 2022, and be completed by 2025.


Construction of the wind farm is set to start in 2023, and operational by 2027, at the earliest. The project’s capacity is unknown by Ørsted due to the always increasing size of available wind turbines for the scheme

Late December 2021

Dredging, Environmental and Marine Engineering (DEME) NV Offshore’s jack-up Sea Installer left the Port of Hull loaded with the last batch of turbine components to be installed at the 1.32 GW Hornsea Two.

The Sea Installer together with its sister vessel, Sea Challenger, have been transporting the wind farm’s 165 Siemens Gamesa 8.4 MW turbines from Siemens Gamesa’s facilities in Hull and installing them at the project.

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