Interconnectors strengthen security of supply by providing a proven, reliable way for electricity to flow between neighbouring countries. These point-to-point transmission cables are at the heart of the transition to a secure, clean, and affordable energy system for consumers in Great Britain and beyond. Interconnectors are doing what they were built to do – keeping the lights on today and helping to power the nation. 

What are interconnectors and how do they work? 

Interconnectors are high voltage cables that are used to connect the electricity systems of neighbouring countries. They allow us to trade excess power, such as renewable energy created by the sun, wind and water, between different countries.

  • They carry electricity from where it’s produced and in abundance (cheapest), to where it is needed most and where supplies are scarce (more expensive). 

  • Subsea cables can stretch for hundreds of kilometres and are connected at either end via converter stations and underground cables that link into the domestic power grids.At 765km, our latest interconnector Viking Link is the world’s longest onshore and subsea connection, linking the UK and Denmark. This is even longer than the North Sea Link which began operation in 2021 and stretches for 720km across the North Sea between the UK and Norway, the world’s longest subsea route. 

  • Interconnectors enable power to flow in both directions. So, when generation is low in one market, electricity can be drawn from a neighbouring country to keep supplies secure.  

Our existing interconnector portfolio

We already have interconnectors linking us to France (IFA, IFA2), Belgium (Nemo), Norway (North Sea Link), Denmark (Viking Link) and the Netherlands (BritNed), and each year they power millions of homes. By 2030, 90% of the energy imported by our interconnectors will be from zero carbon energy sources. Learn more about our interconnector portfolio here. 

Interconnected dashboard

The power of partnerships

The following data demonstrates just how effective we can be when we work together. Based on our combined interconnector energy imports we have:

  • The equivalent number of UK homes powered for a year by interconnector imported energy
  • The equivalent number of cars taken off the road for a year thanks to CO2 savings from interconnector flows
  • Tonnes of Carbon avoided by interconnector imported cleaner, greener energy 


All our data is accurate from within the last 2 weeks. This spans either from 2018 to present, or from Jan 1 2023 to present. 

See our methodology here. 


Jan 2022 - September 2023


Jan 2009 - Sept 2023









More information

Check out our latest animations and brochure via the links below.

Watch: A co-ordinated approach to offshore development is vital

The North Sea has the potential to become Europe’s green energy ‘powerhouse', but only if we work together.

Vital connections

Read more on how interconnectors are helping to secure our energy future, into 2024 and beyond.

A new generation of offshore hybrid assets

We’re developing a new generation of innovative offshore hybrid assets (OHAs), which combine the enormous benefits of interconnectors and offshore wind. These assets will allow clusters of offshore wind farms to connect to multiple countries in one go.