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Offshore Wind Journal

Largest offshore windfarm in the Baltic inaugurated and connected to the grid

Wed 17 Apr 2019 by David Foxwell

Largest offshore windfarm in the Baltic inaugurated and connected to the grid
50Hertz has connected two offshore windfarms in the Baltic - Arkona and Wikinger - to the grid ahead of schedule and under budget

The Arkona offshore windfarm developed by Eon and Equinor has been formally inaugurated by German chancellor Angela Merkel. “Arkona sets a standard for the energy transition,” said the chancellor.

Arkona is 35 km northeast of the island of Rügen in the Baltic and has a capacity of 385 MW. Approximately €1.2Bn (US$1.4Bn) was invested in its development. The windfarm uses 6-MW turbines supplied by Siemens Gamesa, and is a joint venture between Eon in Germany and Norwegian energy company Equinor.

Shortly after the inauguration, transmission system operator 50Hertz confirmed that it has connected the Arkona offshore windfarm and the Wikinger offshore windfarm to the grid, on time and below budget.

After three years of construction and a total investment of approximately €1.3Bn (US$1.5Bn), electricity from the windfarms is now flowing to the Lubmin substation via the Ostwind 1 grid connection. From there it is transmitted ashore via three 90-km submarine cables.

Connection of Arkona and Wikinger was 50Hertz’s largest investment project to date. The project started in 2015 and is the first time a 220-kV three-phase grid connection has been undertaken in the Baltic. Until now, all of the windfarms in the German sector of the Baltic used 150-kV three-phase cable systems.

The Ostwind 1 connection uses three cables each of approximately 90 km. 50 Hertz chairman of the supervisory board Chris Peeters said, “50Hertz was able to connect the Arkona offshore windfarm to the grid on time and at a lower cost to the grid customer than originally calculated.

“Ostwind 1 has set a new standard for the implementation of such projects. Today is a really good day for the energy transition in Germany and for the development of offshore wind energy in the Baltic.”

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