Hornsea Offshore Wind Zone

Seaway7 secured contracts on all three projects within Ørsted’s record-breaking Hornsea zone – a hat-trick that underscores our role as a trusted partner in building the world’s largest offshore wind farms in the UK North Sea.

Hornsea 1: Transport and installation (T&I) of 89 inter-array cables (33kV), totalling approximately 170km – supporting the world’s first offshore wind farm to exceed 1GW capacity.

Hornsea 2: T&I of 165 inter-array cables (66kV), totalling approximately 382km, powering what became the world’s largest offshore wind farm at the time of commissioning.

Hornsea 3: Contracted for T&I 197 inter-array cables (66kV). Offshore execution is underway and when completed, it will surpass its predecessors and become the word’s largest offshore wind farm with a planned capacity of 2.9GW.

Located around 90–160 km off the east coast of England, in water depths of approximately 25 to 75 metres, the projects demonstrate Seaway7’s ability to adapt and deliver complex inter-array cable scopes consistently and at scale, in varying offshore conditions.

Across all three projects, Seaway7 has remained a steadfast partner – with proven capability earning us repeat awards that reflect client confidence in our performance. For the current phase, delivery is being led from our Aberdeen office, building on experience gained across the earlier Hornsea projects, and supported by strong local engagement within the supply chain.

Once complete, we will have installed over 1,000 km of inter-array cables across the Hornsea Zone, supporting enough clean energy to power more than 5.4 million UK homes.