Iemants – Jan De Nul joint venture has been awarded an EPCI contract for two gravity based foundations (GBF) for Kriegers Flak offshore wind farm from Energinet.dk and 50Hertz Transmission GmbH.
The Kriegers Flak is a 600 MW offshore wind farm located in the Danish Baltic Sea.
Iemants and Jan De Nul will provide the engineering, construction and installation of two GBFs for two offshore substations, serving both the Krieger Flaks offshore wind farm and an interconnector between the Danish and German power net.
The interconnector project is funded by the European Energy Programme for Recovery.
The wind farm consists of two sections, each with its own substation. Kriegers Flak A, the west section, will have a total capacity of 200 MW. The east section, Kriegers Flak B, will have a total capacity of 400 MW.
Jan De Nul is in charge of the design, construction, transport and installation of the GBFs, whereas Iemants will take care of the detailed design, fabrication and transportation of the steel shafts and decks which will be placed on top of the GBFs. The steel structures will be (pre)fabricated at the Iemants’ facilities in Belgium, Jan de Nul informed.
The GBFs will be constructed on a pontoon based in the port of Zeebrugge (Belgium) and towed to the Baltic Sea.
In Denmark, Jan De Nul’s backhoe dredger Gian Lorenzo Bernini and the fallpipe vessel Adhémar de Saint-Venant will take care of the excavation of the foundation pit and installation of the gravel bed.
Once the pontoon with GBFs arrives in Denmark, it will be immersed to offload the structures upon which the foundations will be installed onto the gravel bed. Finally, the GBFs will be ballasted and protected through scour installation by means of the Adhémar de Saint-Venant.
The GBFs are expected to be installed offshore by the end of 2017.