Offshore construction

This page features the latest updates on Sofia's offshore construction progress and upcoming activity. It includes details of the main contractors that will ensure the successful delivery of the project's infrastructure offshore, from the array site on Dogger Bank to landfall in Teesside.

LOCATION OF OFFSHORE INFRASTRUCTURE

Offshore map with turbine locations

OFFSHORE CONSTRUCTION OVERVIEW

Following the completion of the landfall horizontal directional drill to install ducts in early 2023, offshore construction started in September 2023 with the first phase of the installation of Sofia's two 220 kilometres long export cables. The brand new vessel Leonardo da Vinci has carried out the work, in two phases.

Work on the Dogger Bank site started in 2024 with the installation of the first of the project's 100 extended monopile foundations, delivered by the vessel Aeolus. 2024 was a busy year with the installation of the export cables, foundations, 350 kilometres of array cables and, at the heart of the wind farm, the 13,000 tonne offshore converter platform and its 7000 tonne jacket foundation.

2025 has already seen its first major milestone, with the installation of the first of the 14MW turbines.

Soon we will be fitting turbines with recyclable blades. 

Looking across 2025, we expect to complete the foundation and array cable installations, commission and energise our onshore and offshore platforms, and generate first power.

Construction is anticipated be completed by the end of 2026.

WHAT'S HAPPENING OFFSHORE

The offshore site is a busy space at the moment with a range of activities happening concurrently. 

The Van Oord vessel Aeolus continues to install the foundation pieces, with the 100th due in July. Meanwhile the Calypso, also under Van Oord's direction, is installing array cables. The Calypso will leave the field in June, to be replaced by the Boka Ocean.

The Wind Peak, by Cadeler, has begun installing wind turbines, which we estimate will take around 12 months.

Much work is being done on the offshore converter platform in readiness for energisation, which will happen in Q3 2025.

You can see the latest images of this work in our image gallery.

OFFSHORE CONSTRUCTION TIMETABLE

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