ORSTED – HORNSEA 3: Major Progress as Hornsea 3 Enters the Water
When complete, Hornsea 3 from Orsted will be the largest single-site offshore wind farm in the world, generating 2.9 GW, enough to power 3.3 million UK homes. Managing Director Luke Bridgman tells Energy Focus that things are moving quickly, and there is little room for error with first power planned for this year.
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Few projects in global offshore wind carry the same weight, scale, and expectation as Ørsted’s Hornsea 3 Offshore Wind Farm. Positioned off the UK’s east coast, the development is not only set to become the single largest offshore wind farms in the world, but also a cornerstone in Britain’s broader push towards energy security and net zero.
For industry observers and decision makers, Hornsea 3 represents both a technical benchmark and a barometer for the sector’s ability to deliver mega-scale infrastructure on time and at pace. Since 2024, when Managing Director Luke Bridgman told Energy Focus that onshore works were proceeding as planned, the project has transitioned decisively into full offshore execution, marking a critical point in its lifecycle and reinforcing its status as one of Ørsted’s flagship global assets.
The scale alone is striking. With a projected capacity capable of powering millions of UK homes thanks to some of the largest turbines, blades, and towers ever seen, Hornsea 3 sits at the forefront of a new generation of offshore wind developments defined by size, complexity, and integration challenges. Yet, as with many large infrastructure projects, the real story lies in how it’s executed. Over the past three years, Ørsted and its partners have pushed forward with a programme that has steadily turned engineering ambition into physical progress, from substations and transformers to cables and foundations. The emphasis has been on planning, coordination, and de-risking – all essential in a market where supply chain pressures and regulatory hurdles continue to test developers.
The effort to turn planning into progress has been particularly visible onshore. The completion of 54km of cabling across Norfolk, between Norwich and the coast at Weybourne, marks a significant milestone in the delivery of the physical infrastructure.
Collaboration with key stakeholders has been important, particularly around the integration of key assets such as the onshore converter station and the arrival of major transformers. These transformers are not simply components; they are the critical interface between generation and transmission, underpinning the entire value chain from offshore production to onshore distribution.
“We will deliver the transmission system and the connection for first power in 2026 – that has always been our ambition. That will be a huge milestone but there are a lot of different things happening,” details Bridgman. “We are working closely with National Grid at the Norwich Main Substation site where our grid connection sits, right through to the onshore convertor station where our first transformer recently arrived – a major milestone and an extraordinarily complex logistical operation in its own right. When they are in, that is the heart of the interconnection between the two complete.”
With onshore works largely complete and reinstatement of farmland underway, attention has now shifted offshore, where the scale of activity is accelerating rapidly. This transition represents one of the most complex phases of any offshore wind project, requiring precise coordination across vessels, contractors, and environmental considerations – “We’re currently in the calm before the storm,” smiles Bridgman light-heartedly. It is also the phase where progress becomes most visible, as steel meets sea and infrastructure begins to take shape above the waterline.
OFFSHORE PUSH
“2026 is the year when we hit the North Sea and head out there to put things into the water – it’s very exciting,” says Bridgman. His words reflect a broader industry sentiment; the move offshore is both a culmination of years of preparation and the beginning of the most intensive construction period. Over the next two years, Hornsea 3 will see continuous activity across its site, from foundation installation to cable laying and substation installation.
The arrival of the first foundations in the UK earlier this year signalled the start of this offshore campaign. These massive structures, designed to anchor turbines in challenging North Sea conditions, will soon be installed with the support of some of the newest and most advanced vessels in the industry. Among them is the Sleipnir, operated by Heerema, widely recognised as one of the world’s largest crane vessels. Its role in installing topside jackets and topsides underscores both the scale of the project and the level of engineering capability required.
Bridgman outlines the scope of activity underway: “We now have every single one of the packages for Hornsea 3 – export cables, array cables, substations, foundations, turbines etc – planning to put something in the water in the next few months, and that will be another solid two years of work. We are now busy installing the first topside and jacket, the scour protection is going down, the foundations will soon be under way, we are clearing boulders, we have finished the UXO clearance, the demarcation buoys are in – all of the planned works around the field are starting to come to fruition.”
Parallel to foundation installation, subsea cable operations are also moving into focus. The transition joint bay, where offshore export cables connect with onshore infrastructure, represents a critical interface in the system.
The process of pulling cables through ducts into this connection point is both technically demanding and symbolically important, effectively linking the offshore generation site with the onshore grid network. “The onshore cabling is complete,” says Bridgman. “We are now excited to get the export cable vessel to start pulling in the offshore cables, and that is another milestone after years of engineering, manufacturing and preparation.”
In tandem has been the completion of the first offshore substation structure which will provide the backbone for power collection and transmission across the wind farm. These substations are critical nodes in the network, aggregating electricity from multiple turbines before sending it ashore via high-voltage export cables. This successful installation signals that the project is moving steadily towards its operational phase.
MARINE MAMMALS, UNDERWATER NOISE
As offshore activity intensifies, environmental management remains a central priority. Hornsea 3’s Consents team is working closely with a number of environmental contractors including Seiche on key issues such as marine mammal and underwater noise monitoring during foundation installation. These activities are not only regulatory requirements but also integral to Ørsted’s broader commitment to responsible offshore development.
The partnership with Seiche has delivered tangible value, combining technical expertise with a proactive approach to risk management. Seiche has played a key role in identifying and addressing potential consenting challenges, ensuring that documentation and processes remain aligned with regulatory expectations while supporting project delivery. The collaboration extends across Ørsted and its offshore contractors, reflecting a joined-up approach that is increasingly essential in large-scale energy projects.
David King, Offshore Environment Manager for Hornsea 3 at Ørsted, highlights the strength of this relationship: “We particularly value Seiche’s technical competence, responsiveness, and collaborative way of working. Their understanding of the permitting requirements and practical offshore constraints allows them to provide balanced advice that supports delivery while maintaining compliance.”
This balance between environmental stewardship and construction efficiency is becoming a defining feature of modern offshore wind, particularly as projects move into more complex and sensitive marine environments.
Together, these developments paint a picture of a project that is not only advancing but doing so in a coordinated and controlled manner. In an industry often characterised by delays and cost overruns, particularly at this scale, Hornsea 3’s progress stands out. The alignment of onshore and offshore timelines, the readiness of key infrastructure, and the integration with the national grid and local community all point to a programme that has been carefully planned and effectively executed.
For the UK, the implications are significant. Offshore wind remains central to the country’s energy transition strategy, and projects like Hornsea 3 are essential to meeting ambitious decarbonisation targets. At the same time, they contribute to energy security, reducing reliance on imported fuels and providing a stable, domestic source of power at a time of ongoing uncertainty. The project also supports a wide network of suppliers, contractors, and regional economies, reinforcing its role as both an energy asset and an economic driver.
POWERING AHEAD
As Hornsea 3 continues to move forward, the focus will increasingly shift towards integration, commissioning, and ultimately, generation. The target of first power in 2026 remains firmly in sight, underpinned by the steady progress seen across both onshore and offshore elements. While challenges inevitably remain, particularly in managing the complexities of offshore construction, the trajectory is clear.
For a project of this magnitude, staying on track is no small achievement. It requires not only technical excellence but also strong partnerships, effective risk management, and a clear strategic vision. Hornsea 3 appears to be delivering on all fronts, positioning itself as a benchmark for future developments in the sector.
In many ways, the project encapsulates the evolution of offshore wind itself – from early-stage innovation to large-scale industrial delivery. As turbines begin to rise from the North Sea and cables connect to the UK grid, Hornsea 3 is moving from concept to reality, reinforcing its place at the heart of the energy transition and underscoring Ørsted’s leadership in the global renewable energy landscape.
“We are all immensely busy, but it’s very exciting,” concludes Bridgman.