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Offshore Wind Journal

Boskalis bags installation deal for Scottish offshore windfarm

Mon 07 Jan 2019 by David Foxwell

Boskalis bags installation deal for Scottish offshore windfarm
Boskalis will use Bokalift 1 to transport and install the foundations, offshore substation foundation, substructure and topside for the Inch Cape project

Royal Boskalis Westminster has signed a preconstruction agreement for an offshore windfarm off the Scottish coast and plans to use a specially developed vessel for the project.

The preconstruction agreement (PCA) is for the Inch Cape offshore windfarm project. The contract was awarded by Inch Cape Offshore Limited (ICOL), a subsidiary of Red Rock Power Ltd. The project scope includes transporting and installing the wind turbine foundations, the offshore substation and cables.

The company plans to use its heavy-lift vessel Bokalift 1 for the project, a vessel that was converted specifically to undertake projects of this type.

The award is subject to a successful bid by ICOL in the next UK Contracts for Difference (CfD) auction in mid-2019 and financial close in the second half of 2020.

Excluding procurement, the contract is valued at approximately €200M (US$228M). In the coming months, Boskalis will assist with the ongoing engineering and design of the project. The ultimate size of the contract, including the cost associated with supplying the wind turbine foundations and inter-array cables will be determined during this period.

The PCA includes the engineering, supply, transportation and installation of up to 72 prepiled jacket foundations and up to 84 inter-array cables in addition to transporting and installing the offshore substation.

Bokalift 1 will be deployed to transport and install the jacket foundations, the offshore substation foundation, substructure and topside. In a consortium with NKT, Boskalis will supply and install two export cables, each of 85 km, connecting the offshore substation to the mainland. The windfarm is in the North Sea, 15 km off the Angus Coast off the east coast of Scotland.

Boskalis said it aims to maximise UK local content. The project is due to be executed in 2021-2022, in time to enable Inch Cape to meet the CfD 3 delivery window between 2023 to 2025.

Bokalift 1 is capable of lifting 3,000 tonnes at a radius of 28 m and 1,200 tonnes at 50 m. Using its main block, the crane on the vessel, which was built by Huisman, will be capable of lifting a load to 90 m above deck at a radius of 30 m and 99 m at a 35 m radius.


The Offshore Wind Journal Conference in London on 5 February 2019 will address key issues including global market developments, increasing turbine sizes, floating offshore wind and industry regulations.

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