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50Hertz grid enables first partial feed-in of power from offshore wind farm Arkona

From sea to the onshore transmission grid

50Hertz is responsible for the grid connection of all wind farms in the Baltic Sea. EnBW Baltic 1, the first commercial offshore wind farm in the Baltic Sea, has been officially operational since 2 May 2011. The 21 wind turbines each generate 2.3 MW, generating a total of approximately 50 MW. Around 50,000 households can be supplied with this electricity.

Since late 2015, the Baltic 2 offshore wind farm is also part of the grid. Other projects are either under construction or being planned.

Offshore Overview of the projects in the Baltic Sea. Click the map to magnify.


Approval, liability regime and Offshore Grid Development Plan

The Federal Maritime and Hydrographic Agency (Bundesamt für Seeschifffahrt und Hydrographie, BSH) is responsible for the approval of offshore wind turbine installations located in the Exclusive Economic Zone (EEZ). However, each federated state is responsible for the approval of installations located within its territorial waters, i.e. the 12 nautical mile perimeter. For the Baltic Sea, the responsible states are Mecklenburg-Western Pomerania and Schleswig-Holstein.

The conditions for the development of offshore wind power were determined by the legislator, for instance the establishment of a liability regime. This regime obliges the transmission system operators to pay damages to wind turbine owners if they are unable to transport the electricity they produce at sea to the consumer because the power line is not ready or interrupted for a long time. The grid operators have to take out insurance for these potential compensations. Another milestone was reached with the Offshore Grid Development Plan (Offshore-Netzentwicklungsplan, O-NEP), which establishes reliable framework conditions for the development of renewable energy sources at sea. The O-NEP, which was first drawn up in 2013, lays down the location and scale of future grid connections. As such, it is the first document to unite the development of the transmission system on land, the spatial planning at sea and the technical framework conditions for a sustainable planning, with detailed information on the status, schedule, deadlines and costs of the projects required for the next ten to twenty years.


Do you have any questions? Please contact us.
Dr. Danuta Kneipp

Public participation

Dr. Danuta Kneipp
Tel: +49 30 5150-2198
Fax: +49 30 5150-3112
E-Mail: danuta.kneipp@50hertz.com