Highlights

• Hornsea wind farm project is one of the largest offshore wind farm projects in the world, with a total capacity of 6 GW.
• Hornsea One can fulfill the renewable energy demand of 1 million households.
• Hornsea Project Two can provide can fulfill the clean electricity demand of 1.3 million British households. 
• Hornsea Project Three will generate sufficient power to meet the daily energy consumption demand of more than two million households.

Introduction

The Hornsea project is a four-part wind power project to support the shift from traditional power sources to renewable power in the United Kingdom. As part of the mega plans, a series of offshore wind energy farms are currently in development in the Hornsea Zone off the Yorkshire coast in the United Kingdom. 

It is a part of the Round 3 wind power mega projects sanctioned by the UK government to maximize offshore wind capacity by 6 GW.

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Location

The Hornsea Project is located in the Humber region of the North Sea off the coast of England. The location of the project is between Dogger Bank Wind Farm and East Anglia Wind Farm. The wind speed and depth on the British coast are favorable for generating offshore wind power. This is why the UK has resorted to Wind Energy to produce clean electricity to meet its domestic power needs.

Project Scope

Hornsea One

The first phase, Hornsea Project One or Hornsea One, spreading across 407 km²,  is located in the Humber region, UK, about 120 km off the Yorkshire coast. Hornsea One is part of a GBP 6 bn (USD8.7 bn) renewable energy project to transform the UK’s power sector.

The construction work began in 2018, and the final remaining turbines were installed in October 2019. With 1.2 GW of wind power capacity, it became the largest offshore wind farm in the world upon completion.

Hornsea Project One is a 50-50 Joint Venture (JV) between Ørsted AS (formerly DONG Energy) and Global Infrastructure Partners. An FID (Final Investment Decision) was made in February 2016 for Hornsea One.

With more than 900km of cables, the Hornsea One project has the world’s longest HVAC (High-Voltage AC) offshore wind export cable system, connected to Killingholme Power Station in North Killingholme. Hornsea One has 174 Siemens wind turbines of 7MW rated capacity.

Hornsea Two

The Hornsea two, with a capacity of 1.4 GW, is already under construction in the northeast of the Hornsea project one in the same Hornsea project zone of the North Sea.

Hornsea Two was earlier allocated to Smart Wind - a 50-50 JV between Mainstream Renewable Power and Siemens Financial Services. However, it eventually went to Ørsted AS when it acquired SmartWind in 2015.

The Secretary of State for Energy and Climate Change granted the development consent in August 2016, and the FID was taken in September 2017. The project features 165 Siemens Gamesa wind turbines, with each wind turbine having a capacity of 8-MW.

In December 2021, Hornsea Two officially started producing power after the vessels The Sea Installer and Sea Challenger transported all the Siemens Gamesa turbines.

Hornsea Three

Hornsea Three (initially proposed for 2400 MW) was split into two separate phases - Hornsea Three (1-2 GW) and Hornsea Four (1 GW), in a revised proposed plan by the project owner Orsted in February 2018. The DCO - Development Consent Order was submitted in May 2018 and was granted in December 2020.

Upon completion, this project will become the world’s largest offshore wind farm, fulfilling the power needs of more than two million households.

Contractors involved

Siemens was awarded the contract to supply wind turbines for the project.

Balfour Beatty got contracts to construct the onshore substation for Hornsea One and Two. 

Atkins provided the engineering design services for three offshore substations for the Hornsea One project.

Semco Maritime provided the EEC (Electrical Engineering Consultant) services for mechanical and electrical basic engineering design for the offshore substation for Hornsea Two.

Orsted awarded ABB a USD 250 million contract to supply the 220kV high-voltage cable system and another USD 150 million contract to connect the Hornsea Project Two wind farm to the UK national grid.

JDR received the contract to supply subsea power cables for a 242 km long power transmission line. The company also received a contract to supply inter-array cables for Hornsea Two and undertake the termination work.

RINA got the contract to provide earthing design services and lightning protection for the onshore substations.

Siemens Gamesa Renewable Energy awarded SMC a contract to provide marine coordination services for the Hornsea One project.

Fussey Engineering got the contract to supply and install cladding and steel framework for the 400kV National Grid substation site.

The HDD (Horizontal Directional Drilling) contract for Hornsea Two was awarded to AMS Trenchless Specialists. The company’s responsibility was to construct ducts and lay the cables at the landfall site in Horseshoe Point, North Killingholme.

Investors of Hornsea Wind Farm

The Danish multinational energy company Orsted AS is the owner of the whole  Hornsea project.

Aviva Investors, the global asset management arm of Aviva PLC, announced an investment of GBP  400 million in 2018.

TRIG, a London-based renewable infrastructure investment company, announced in 2022 to take its total stake in Hornsea One to 10.2%.

AXA IM ALTS, the global investment arm of AXA Insurance Group and Crédit Agricole, the french multinational banking institution, announced an investment of GBP 3 billion to acquire a 50% stake in the Hornsea Two project.

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