An undersea cable hundreds of kilometres long is to be laid between Germany and Britain by 2028 to make it easier to trade and distribute electricity.
Germany's Economy Minister Robert Habeck will attend a groundbreaking ceremony at the German landing point of the new electricity line in Wilhelmshaven on the North Sea coast on Tuesday at 10:30 am (0830 GMT).
The 725-kilometre-long cable, called NeuConnect, will link the German transmission grid from Wilhelmshaven through the North Sea to the Isle of Grain in south-east England.
It is the first direct electricity connection between the two countries. The project is backed by a consortium of investors, with costs amounting to almost €3 billion ($3.2 billion).
The line should be able to transport up to 1.4 gigawatts of electricity in both directions. The project company says that is enough energy for around 1.5 million households.
Surplus wind power, which is produced in the German North Sea but cannot yet be transported onshore due to bottlenecks in the electricity grid, will be exported via the submarine cable.
The UK is currently a net importer of electricity.