UK´s National Grid and TenneT Germany have announced a strategic cooperation to develop GriffinLink, a planned multi-purpose interconnector (MPI) between Great Britain and Germany that aims to maximise the use of offshore wind resources and strengthen cross-border energy security in Europe.

The project was unveiled during the North Sea Summit in Hamburg. If developed, GriffinLink would connect British and German offshore wind generation to both national electricity systems, marking a step towards a more integrated, flexible and efficient energy system for Great Britain and Germany, while delivering secure and affordable energy to consumers.

According to the companies, GriffinLink could make a significant contribution to security of supply and market integration in northwestern Europe. As a cross-border hybrid energy system, the interconnector would enable cleaner electricity to be fed into the grid where it is generated and transported efficiently to where it is needed.

A coordinated approach to offshore infrastructure

National Grid and TenneT highlighted that this integrated model would allow for better utilisation of electricity grids and a more efficient use of renewable energy across national borders. It would also help lower overall system costs, reduce the amount of supply chain materials required, and minimise the impact on coastal communities and the environment.

As a multi-purpose interconnector linking offshore wind in two countries, GriffinLink would be the first project of its kind in Europe, representing a milestone for cross-border energy security and system stability.

Ben Wilson, President of National Grid Ventures, said the company is “proud to work with TenneT Germany on this groundbreaking project,” stressing that MPIs such as GriffinLink are essential for maximising resource efficiency, reducing costs and minimising environmental and community impacts. He added that clear regulatory frameworks are now needed to enable the deployment of coordinated offshore grids at pace.

Tim Meyerjürgens, CEO of TenneT, described GriffinLink as “a major milestone in cross-border energy security” and said the project demonstrates how offshore wind farms can be connected beyond national borders to create a meshed European energy system. He emphasised the need for clear political framework conditions to enable more hybrid, cross-border connections in the future, calling this approach key to Europe’s secure, efficient and independent energy future.

UK Secretary of State for Energy Security and Net Zero, Ed Miliband, welcomed the initiative, stating that the plans could further maximise shared offshore wind resources to deliver cleaner, cheaper and more secure power for households and businesses in both Britain and Germany. He added that expanding clean energy is central to strengthening energy sovereignty and reducing reliance on fossil fuels.

Project scope and next steps

GriffinLink would build on National Grid’s existing 7.8 GW interconnector portfolio and TenneT Germany’s 23 GW portfolio. Both companies bring extensive experience in the development, construction and operation of interconnectors, positioning them to deliver the project.

Under the cooperation agreement, National Grid Ventures and TenneT Germany will explore the potential for GriffinLink to simultaneously connect up to 2 gigawatts of offshore wind capacity between the British and German electricity systems. In the coming years, onshore and offshore studies will begin, alongside further analysis of existing developments and proposals as part of a broader integrated European grid.

During the development phase, additional research will be carried out to establish a robust business case and assess the wider socio-economic costs and benefits. The project remains subject to a final investment decision.

If approved, GriffinLink is expected to become operational in the late 2030s, supporting growing electricity demand driven by electrification, decarbonisation, data centres and artificial intelligence, while maximising offshore wind generation in the Northern Seas.