The UK’s National Grid and TenneT Germany have announced plans to develop GriffinLink, a multi-purpose offshore interconnector (MPI) intended to link British and German offshore wind generation to the electricity networks of both countries.

This marks an advancement towards an integrated and flexible energy network for Great Britain and Germany, supporting secure and affordable energy delivery.

GriffinLink is designed to contribute to security of supply and market integration across north-western Europe. The cross-border hybrid system will allow renewable electricity to be transmitted from where it is generated directly to where it is required.

The integrated solution facilitates the improved utilisation of grid resources and increases efficiency in renewable energy deployment across national borders.

The project aims to reduce costs and the need for supply chain materials, while also minimising environmental impacts and effects on coastal communities.

As a multi-purpose interconnector harnessing wind power in both countries, GriffinLink would be the first initiative of its kind in Europe, representing a milestone for cross-border energy security and stability.

The proposed project will build upon National Grid’s 7.8GW interconnector portfolio alongside TenneT Germany’s 23GW portfolio. Both companies have previously constructed, developed and operated interconnectors in Europe.

GriffinLink is scheduled to become operational by the late 2030s, optimising offshore wind use in the Northern Seas amid increasing energy demand driven by electrification, decarbonisation, data centres and AI applications.

National Grid Ventures and TenneT Germany will explore the potential of GriffinLink as a 2GW MPI linking British and German electricity systems. This includes conducting onshore and offshore studies over the coming years as part of wider European grid integration.

The development phase will involve further research into the business case and analysis of overall socio-economic costs and benefits. A final investment decision will be required before proceeding.

National Grid Ventures president Ben Wilson said: "We are proud to work with TenneT Germany on this groundbreaking project that will enhance the diversity and flexibility in our energy systems.

"MPIs like GriffinLink are important for maximising the efficient use of resources, reducing costs and minimising the impact on coastal communities. Projects like this are vital to delivering a more coordinated, offshore grid. We now need to see the frameworks to make this happen developed and deployed at pace."

In July 2025, National Grid selected Sumitomo Electric Industries, a Japan-based cable manufacturer, as the preferred bidder to supply and install the subsea cable for the 2GW Sea Link high-voltage direct current electricity transmission project.