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Boskalis awarded Hornsea 2 offshore export cable installation contract

Boskalis has been awarded the offshore export cable installation contract for the Hornsea 2 offshore wind farm. The contract awarded by Ørsted Wind Power A/S consists of three export cable circuits, with a total length of approximately 380km.

The Hornsea 2 offshore wind farm will consist of up to 165 turbines with a maximum capacity of 1.4GW and is located approximately 90km off the Yorkshire coast. When complete, it will be able to serve the needs of up to 1.6million homes.

The project scope includes the preparation of the offshore export cable route (geophysical survey, boulder clearance and seabed levelling through dredging), and the installation and protection of the cables. The three 130km long export cables will connect the offshore substation to the onshore substation by means of a 300 meter long horizontal directional drilling, crossing the sea defence of Horseshoe Point. The project is expected to commence later this year with planned completion for late 2021.

Boskalis will deploy a wide variety of in-house specialist services and assets, including a trailing suction hopper dredger, a geophysical survey vessel and multiple cable-laying vessels. Furthermore, Boskalis has recently invested in a new multi-mode plough for both the pre-lay trenching and backfilling. The plough can withstand 200t continuous pull and is capable of trenching at various depths and in a wide range of soil circumstances; designed to minimise the environmental impact. The plough will be pulled by ‘Boka Falcon’, the high-end construction vessel.

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