Kaskasi foundations over halfway

4C Offshore | Bridget Randall-Smith
By: 28/04/2022 DEME

22 of the 39 monopiles have been installed at the the 342 MW Kaskasi project, currently being built 35 km north of the island of Heligoland in the German Baltic Sea.
The foundations and transition pieces, which are manufactured by Bladt Industries A/S, are stored in the Eemshaven before being shipped to the offshore construction site. The foundations, each up to 65 metres long, weigh 660 tonnes. To install the foundations into the seabed at depths of 18 to 25 metres, RWE is utilising two installation methods: conventional hammering and innovative vibro pile driving technology, which has the potential to reduce underwater noise emissions.

Works started with the successful installation of the substation foundation, followed by the installation of the substation topside utilising the DP2 heavy lift vessel ‘Gulliver’, operated by DEME’s joint venture company Scaldis.

RWE also contacted DEME Offshore as additional support for the foundation installation works. DEME mobilised its DP2 offshore installation vessel ‘Neptune’ in combination with the ‘Blue Tern’ from Fred Olsen for the monopile installation.DEME Offshore is managing these tandem transport and installation operations and is providing all the seafastening, handling and hammering equipment.

One of DEME’s renowned turbine installation vessels, ‘Sea Challenger’, has been lined up for installing the transition pieces and subsequent turbine (SG 8.0-167 DD) installation, the latter under a direct charter with Siemens Gamesa. DEME developed a smart technical solution which allows a fast change of installation modus in between the transition piece and WTG installation.

DEME’s XXL cable installation vessel ‘Living Stone’ will lay and bury all 42 inter-array cables and perform associated works.

Bas Nekeman, Business Unit Director Renewables, comments: “We are proud to provide this wide range of transport and installation solutions to RWE for their Kaskasi offshore wind farm. DEME Offshore’s endless creativity and flexibility meant that we could support RWE quickly, and with multiple vessels and specialised equipment. In a very short time, a great team comprising RWE, DEME, IQIP and Fred Olsen professionals joined forces to prepare and launch the installation capabilities required.”

For more information on installation and maintenance of major offshore wind farm components, click here.