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Offshore Construction Update

Offshore construction update - July 2019

Construction of wind turbine foundations

Offshore work on East Anglia ONE continues with all 306 piles at the 102 turbine locations installed on the seabed. The installation of the jacket foundations on top of the piles is continuing. Once complete, these will form the base of the wind turbines.

Above: Jacket foundations. View a larger version of this image

Jacket foundations are a three-legged foundation 65 metres tall and 800 tonnes in weight. They stand in water of average depth 45 metres and are attached to the sea bed with piles."

The first of two offshore export cables, supplied by Nexans, has been successfully installed. The 85km long cable, which was simultaneously laid and buried by Darlington based DeepOcean, will carry the power generated from the turbines to the shore.

The 66kV inter array cables, supplied by Hartlepool based JDR, will connect up the turbines and are being installed by Boskalis.

The offshore substation, which has been in place since September 2018, has since completed the ‘cold commissioning’ phase and will soon be ready to start transferring power once the windfarm begins generating energy.

Blades and towers arrive at Great Yarmouth

Following the decision in 2016 to select Peel Ports Great Yarmouth as the Construction and Marshalling base for East Anglia ONE, we agreed to co-invest £5 million in preparing the port for our project, bringing construction jobs and work to the town. Blades, towers and other turbine components for East Anglia ONE have now begun arriving into the port for pre-assembly.

The 75 metre-long blades are shipped down the coast from Hull to Great Yarmouth and are then carefully lifted off the vessel onto the quayside. The 102 towers, some of which are manufactured in Machrihanish, Scotland, by CSWind UK, are also delivered to Great Yarmouth by vessels using the ‘roll-on, roll-off’ technique.

Above: Photographs by Siemens Gamesca

The components are laid out on the quay before being assembled ready for transportation to the site 43km off the coast.

Once installed and commissioned, each turbine will have a capacity to produce up to seven megawatts of electricity annually, producing clean, renewable power for the UK.

Above: East Anglie ONE Offshore Windfarm. View a larger version of this image

 
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