Navantia lands new-look jacket job for Danish offshore pilot

Spanish contractor Navantia will build a quartet of next-generation jackets for the DKr300m ($44.5m) Nissum Bredning offshore wind demonstration project in the Danish North Sea, following a contract award from Siemens.

The steel three-legged design foundations will serve as the base for a concept that knits together the German engineering giant’s ultra-large 7MW SWT-7.0-154 turbine with an innovative concrete transition piece, and has built-in high-voltage cabling, transformers and switch-gear.

Navantia will fabricate the jackets for the 28MW project with partner Windar, with which it has worked on a series of foundation orders for developments including Iberdrola’s 350MW Wikinger and 1.7GW East Anglia 1 (EA1) wind farms, and Statoil’s 30MW Buchan Deep floating array.

Siemens' joined-up thinking to cut offshore wind costs

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Delivery of the Nissum Bredning order, being handled in parallel with construction of 42 jackets for EA1 at the Fene facility in northwestern Spain, is slated for mid-year.

Nissum Bredning, located in 2.6 metres of water in a fjord close to Thyborøn, is being developed by Nissum Bredning Vindmøllelaug I/S (55%) and local utility Jysk Energi (45%), with support from the Danish Ministry of Energy.

The project, which will use a piled-in version of the integrated wind power station design Siemens expects to evolve into a concept with suction bucket bases,  is “regarded as an excellent opportunity to test, in a controlled and small-scale environment, a number of new key technologies in the field of offshore wind”, says a Navantia spokeswoman.

"This is the fourth contract and third prime client of Navantia, in less than two years, and reinforces our position as a reference manufacturer in the sector," she adds. "This new contract also opens the possibility to be leader in new technologies and innovation​."

Siemens calculates that its all-in-one concept could pare down the cost of offshore wind projects in water depths of 40-55 metres by as much as 40%.

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