North South Interconnector

Currently there is only one interconnector between Northern Ireland and Ireland. A problem on this interconnector could result in widespread power failures. To limit potential issues, we have to restrict the amount of power that can flow through the interconnector. These levels are well below what electricity users need.

A second North South interconnector would allow the network to operate much more efficiently. This project proposes a new 400 kV overhead line to connect the two electricity grids.

The line would run through:

We are responsible for securing planning consent for the project and leading on stakeholder engagement.

The North South Interconnector is a significant project for everyone in Northern Ireland. It will remove a costly bottleneck on the grid and improve our electricity supply. In fact, the project has been awarded Project of Common Interest (PCI) status by the European Commission.

Long-term security of supply

The new interconnector is essential for a secure, efficient and clean electricity supply. A safeguard against supply gaps, it will eliminate the risk of a single event resulting in widespread power failures.

With the interconnector, we can better dispatch power when it's needed. We will be better equipped to react to future changes in supply and demand.

Deliver savings for consumers

The new interconnector removes constraints which currently add costs for consumer. Recent analysis suggests that the project will save NI consumers around £20m per year by 2030.

A more connected grid means a more efficient wholesale market, resulting in downward pressure on prices – good news for consumers and businesses.

Economic growth

Once completed, it'll be the backbone of the transmission system. It will support the growth of renewables and new jobs in the emerging green collar sector.

The North South Interconnector also is essential for local business. With it, businesses will have the power they need to expand and to attract foreign direct investment.

Combat the climate crisis

With the North South Interconnector, we will reduce our reliance on volatile imported fossil fuels. Our focus can move to using our abundant clean resources.

It will facilitate the connection of 900MW of renewable generation. A game changer in the island’s response to the climate crisis.

The North South Interconnector now has full planning permission. We continue to engage with landowners and local communities as the project moves forward.

We are working closely with NIE Networks who will build and maintain the North South Interconnector. The project is on track to be fully operational by 2026.

October 2023

The North South Interconnector has full planning permission. It will now proceed to the next phase of development. We continue to engage with landowners, communities and stakeholders as the project moves forward.

Construction of the project is due to start in 2024. ESB and NIE Networks are ensuring compliance with the approved planning permission. They have carried out site investigation boreholes, along with environmental and technical surveys at tower locations along the route. At this stage, NIE Networks has begun procurement for construction and materials.

There are many documents available detailing different elements of the North South Interconnector. Browse the list to find out more.

In our consultation about this project, we have heard your concerns. Our goal is to address genuine issues from members of the public, particularly in the project area. We’ve put together a helpful guide to answer your questions and explain basic facts about the project.