50Hertz and Energinet have joined forces to fully harvest the offshore wind potential held in the Baltic Sea, power the green transition in Germany and Denmark, and spearhead a new idea for connecting offshore wind farms across borders: the Bornholm Energy Island (BEI) project. This innovative and visionary project will connect multiple wind farms together via a single hub and transport the green electricity that they generate to consumers in both countries while providing transmission capacity for cross-border trading.
The green future of offshore wind hubs and hybrid connections
BORNHOLM ENERGY ISLAND
VISION & TECHNICAL FEATURES
Together, 50Hertz and Energinet want to establish a power hub on the island of Bornholm that is able to provide electricity to consumers in either country, depending on the market and demand in Germany, Denmark and Europe more widely. Electricity generated by the wind farms located off the coast of the island will be centralised at this hub and then converted into high-voltage direct current (HVDC) and transported via 525 kV HVDC sea and land cable systems to onshore substations in Zealand (in Denmark) and Mecklenburg-Western Pomerania (in Germany). In addition, the BEI project will enable the local community on the island to be connected to both Zealand and continental Europe.
Cooperation between countries is the way forward
50Hertz and Energinet are pioneering innovators. BEI will pave the way to a future in which offshore wind energy is no longer harvested by individual countries alone. Instead, in line with the offshore wind potential held by different countries and electricity demand in these, two or more countries will cooperate to efficiently integrate the green electricity generated by offshore wind farms into their energy systems.
We at 50Hertz and Energinet hold a significant amount of expertise in feeding electricity from offshore wind farms into our power grids. The Kriegers Flak - Combined Grid Solution (KF CGS), our joint project which has been fully operational since 2021, laid the foundations for making hybrid interconnectors a reality in both the Baltic Sea and the North Sea. We will continue to use our know-how to implement ever-evolving, more complex and more efficient on- and offshore energy hubs.
NEWS & EVENTS
Green Light for Bornholm Energy Island: Major contracts with suppliers signed
The joint Danish-German Bornholm Energy Island project is moving from the planning and development stage to the implementation stage. The key components for the upcoming Bornholm Energy Island are now secured. Siemens Energy will deliver the high-voltage substations in both Denmark and Germany, while NKT will establish the cable connection between Bornholm and Zealand and as well between Bornholm and the German mainland.
Minister for Climate, Energy and Utilities Lars Aagaard has given Energinet permission to take the next step in the project and invest in the electricity infrastructure for the upcoming Bornholm Energy Island.
At the same time, Energinet and 50Hertz have signed a contract with Siemens Energy for advanced high-voltage equipment, which will constitute one of the largest individual tasks in the joint Danish-German project. The equipment includes four converter stations (HVDC) and one high-voltage station (HVAC), all of which will ensure that at least 3 GW of green power from offshore wind can be transmitted to both Danish and German consumers. Two of the converter stations and the HVAC station will be located near Aakirkeby on Bornholm, while the other stations will be built at Lindehøj on Zealand and the municipality of Kemnitz in the Vorpommern-Greifswald district in Germany.
Energinet has signed a contract with NKT, which will handle both the production and installation of the advanced sea and land cables to connect Bornholm and Zealand and ensure that green power from offshore wind near Bornholm can reach consumers throughout Denmark. NKT has also entered into an agreement with 50Hertz, for the supply of cables for the connection between the Bornholm Energy Island and Germany as part of a larger framework agreement from 2023.
The approval also means that the large support from the EU’s infrastructure program, Connecting Europe Facility (CEF), which was awarded earlier this year, can now be activated. The support amounts to 645 million euros – DKK 4.8 billion – giving the project a significant financial boost.
The EU support was officially marked in connection with an informal meeting of energy ministers in Copenhagen on September 4. Attending were Climate Commissioner Dan Jørgensen, Christian Schmidt, Head of energy department at german ministry for economics and energy, Minister for Climate, Energy and Utilities Lars Aagaard, CEO of 50Hertz Stefan Kapferer, and Energinet's CEO Thomas Egebo.
In the picture (f.l.t.r): Thomas Egebo (Energinet), Stefan Kapferer (50Hertz), Dan Jørgensen (Commissioner for Energy and Housing), Lars Aagaard (Danish minister for climate and energy), Christian Schmidt (Head of energy department at german ministry for economics and energy).
Co-financed by the Connecting Europe Facility of the European Union
Energinet is an independent public enterprise owned by the Danish Ministry of Climate, Energy and Utilities. Energinet owns, operates and develops the transmission systems for electricity and gas in Denmark. Energinet’s purpose is to own, operate and develop the overall energy infrastructure and manage related tasks, thus contributing to the development of a climate-neutral energy supply.
50Hertz operates the electricity transmission system in the north and east of Germany, which it expands as needed for the energy transition. Within these regions, 50Hertz and its around 2,100 employees ensure that 18 million people are supplied with electricity around the clock. 50Hertz is a forerunner in the field of secure integration of renewable energy. In our grid area, we want to integrate 100 percent renewable energies securely into the grid and system by 2032 - calculated over the year. The shareholders of 50Hertz are the Belgian holding Elia Group (80 percent), which is listed on the stock exchange, and the KfW bank group with 20 percent.