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  • Building the foundations of wind energy

ArcelorMittal customer Navantia wins jacket contract for Wikinger offshore project

The Wikinger offshore wind farm will be constructed in the Baltic Sea, about 75 kilometres off the northern German coast. When complete in 2017, the wind farm will supply clean, renewable energy to more than 350,000 households. ArcelorMittal partner Navantia has been commissioned to produce jackets and piles for 29 wind turbines and an offshore substation which will control the energy flowing from Wikinger. ArcelorMittal supplied around 23,000 tonnes of heavy plate for the project between March 2015 and March 2016.

The Wikinger wind farm is being developed by the Spanish electricity producer Iberdrola. In December 2014, Iberdrola awarded the contract for the foundation jackets and piles to a joint venture formed by Navantia and Windar Renovables (Daniel Alonso Group). Together the partners will produce 116 piles and 29 type-B jackets which will be installed at depths ranging from 36 to 39 metres below sea level.

In addition to the jackets, Navantia will also produce the Wikinger offshore substation at its facility in Puerto Real (near Cadiz, Spain). “These commissions represent the first offshore wind projects built by Navantia,” notes Raúl Rico, Navantia’s Wikinger project manager. “However, Navantia has been involved in several onshore renewable energy development projects including wind farms and hydroelectric installations.”

To create the piles and jackets, Navantia and its partner will utilise heavy steel plates produced at ArcelorMittal in Gijón. “The primary steel grade we will use is S355NL in thicknesses ranging from 19.1 up to 60 mm,” explains Raúl Rico.

Most of the steel structural parts have a protective coating to prevent corrosion in the offshore environment. Some jacket elements which will sit below the water have additional cathodic protection.

Logistical advantage of proximity

Gijón is very close to Navantia’s and Windar’s facilities in the north of Spain. “This gives us a serious logistic advantage, as it makes it possible to reduce the delivery schedule,” says Raúl Rico.

ArcelorMittal has supported Navantia with technical advice from early stages of the tender process. “Wikinger represents the continuation of more than a quarter of a century of cooperation between ArcelorMittal and Navantia,” notes Raúl Rico.
“For this project, ArcelorMittal has provided us with extensive advice about relevant tests, technical aspects, and logistics.”

About Wikinger

When complete, the Wikinger wind farm will have 70 Areva M5000-135 wind turbine generators. Each generator has a rated power of 5 megawatts (MW). Overall Wikinger will produce approximately 350 MW of energy annually, covering the energy needs of more than 350,000 households in Germany – and helping to save nearly 600,000 tonnes of carbon dioxide emissions a year. Wikinger covers an area of approximately 35 square kilometres.