October 22, 2020 Read More →

First-of-a-kind subsea transmission interconnection links Danish, German power grids

Renew Economy:

The world’s first hybrid subsea interconnector has been inaugurated this week, integrating two German and Danish offshore wind farms in the Baltic Sea with the other, and allowing power to be brought onshore to Denmark or Germany and for cross-border energy trading.

The Combined Grid Solution (CGS) was inaugurated on Tuesday by German transmission operator 50Hertz and Danish system operator Energinet, and was described by Peter Altmaier, the German Federal Minister for Economic Affairs, as a “European lighthouse project for cross-border cooperation in the field of offshore wind energy.”

The €300 million ($A502 million) CGS creates a cross-border link between both Germany and Denmark, as well as interconnecting Denmark’s under-construction 605MW Kriegers Flak offshore wind farm with two completed German offshore wind farms located in the Baltic Sea – the 48.3MW Baltic 1 and the 288MW Baltic 2.

The onshore grid connections for all three offshore wind farms – the onshore infrastructure which brings ashore the power generated by the offshore wind farm and integrates it into the national grid – also serve as interconnectors. Two submarine cables, each with a length of 25-kilometres and capacity of 200MW, connect the offshore substations of Baltic 2 and Kriegers Flak, bringing both grid connection systems together.

All of which serves to represent the first electric connection between two countries, which not only transports offshore wind power to land between those two countries, but also allows for energy trading.

“With this project, 50Hertz and Energinet are pioneering the efficient integration of offshore wind farms into the cross-border European electricity market,” said Stefan Kapferer, CEO of 50Hertz. “It offers us several effective options to balance the frequency and voltage of our transmission grids at all times, to deal with the integration of renewable energy sources with more flexibility and to increase the stability of the overall system. Therefore, the CGS is an essential puzzle piece of our strategy to cover 100 percent of the electricity demand in our grid area, over the course of a year, with renewable energy by 2032. In addition, the project shows the high significance of the European Baltic area for the energy sector.”

[Joshua S Hill]

More: Germany and Denmark wind connected by world’s first “hybrid” interconnector

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