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Horns Rev 3 monopiles installed

By: Tom Russell 09/01/2018 Vattenfall

Foundations General Vessels Windfarms

The last of the 49 monopiles for the Horns Rev 3 offshore wind farm have been installed off the Danish coast in the North Sea. Installation kicked off at the beginning of October and was completed by DEME Group subsidiary GeoSea using the Innovationjack-up vessel.

The construction work will took place across an 88km² area in the North Sea, at least 34km off the west coast of the Danish Jutland Peninsula. The water depth at the site varies between 10-21m. The 40-50m long steel monopiles each have a diameter of 6.5m and weigh up to 610 tons.

Before the construction could begin, seabed preparations had to be carried out, including a geological survey and a subsequent detonation of old naval mines. Due to noise concerns, a support vessel is being used to place an air bubble installation on the seabed around the construction site. The installation creates a sound-absorbing, double layer of air bubbles that protect marine mammals in the area.

The next step, which will commence by the end of spring, will be to install the transition pieces between the foundation and the turbine tower. After this, the installation of the towers for the 49 V164-8.0 MW wind turbines, currently one of the world's most powerful turbine models, can begin. The turbines will stand 187m high with a rotor diameter of 164m.

Horns Rev 3 is the first project to be built in Danish waters for five years. When complete, expected 2020, the 406.7MW project is expected to be capable of providing enough power to satisfy the annual electricity consumption of 425,000 Danish households. It is being developed near the Horns Rev 1 and Horns Rev 2 offshore wind farms.

Vattenfall is also currently developing the 610MW Kriegers Flak and 350MW Vesterhav Nord and Vesterhav Syd wind farms off the coast of Denmark.

Construction permission for Kriegers Flak was granted to Vattenfall in November 2016 with a winning bid of €49.9/MWh. The wind farm will also establish an interconnection between the Danish and German mainland grids via two subsea cables connecting Kriegers Flak to the Baltic 1 and Baltic 2 wind farms. This interconnector will therefore allow for an increased exchange of electricity between Denmark and Germany.

Vattenfall won the Danish near-shore wind tender for Vesterhav Nord and Vesterhav Syd back in September 2016 with a bid of DKK 475/MWh (€63.8/MWh). The two sites are located on the west coast of Jutland and will have a total capacity of 350MW. Vesterhav Syd will be the larger of the two sites with a 180MW capacity and Vesterhav Nord will have a 170MW capacity, both project combined are expected to provide sustainable energy for 375,000 households annually.

For more information, please follow the links provided. Alternatively you can view the project using 4C Offshore's interactive map.

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Horns Rev 3 monopiles installed

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