North-South Interconnector Will Run Overground: What It Means for Irish Electricity

The North-South electricity interconnector will be built as an overhead line and is now expected to be energised by 2031, the Minister of State for Energy, Alan Dillon, has confirmed. The confirmation settles how the 138 km link between Meath and Tyrone will be built, after a 20-year argument over an underground option. For households, it matters because it strengthens the all-island grid and supports more renewable generation.

What Was Decided?

The Minister told the Dáil that EirGrid has determined the project must be delivered as an overhead line, and that the Government has accepted that expert opinion.

The background, according to The Irish Times report on the decision, is:

• The project was first proposed 20 years ago.
• It is a 400 kV line running about 138 km from County Meath to County Tyrone.
• It is designed to substantially increase the power transfer capacity between the two grids.
• Undergrounding has been assessed repeatedly since 2008, and a 2023 independent report found it was not feasible.
• Undergrounding would cost up to three times more than the overhead option.
• EirGrid has offered landowners up to €50,000 per pylon.

*Project details as reported on 5 November 2026.*

There is still local opposition, particularly in Cavan, Monaghan, Armagh and Tyrone, and legal challenges are continuing. The Government's position is that the project is critical infrastructure and that further delay carries its own cost.

Why Does an Interconnector Matter to Households?

An interconnector is a high-voltage cable between two electricity systems. It lets power flow in whichever direction is needed, which does three things for consumers.

• It improves security of supply, because a shortfall on one side can be covered from the other.
• It gives renewable generators a bigger market, which makes wind and solar projects more investable.
• It tends to reduce price spikes, because more supply can reach the market when local generation is tight.

Ireland already has interconnectors to Britain and is exploring one to Spain. The North-South link is different because it connects the two grids on this island, which have been physically linked for decades but with limited capacity.

How Long Until It Makes a Difference?

2031 is the target for energisation, so the benefit is not immediate. That timeline matters for anyone weighing up a home upgrade now.

• The grid constraints that cause curtailment and high prices are a today problem, not a 2031 problem.
• Home solar and a battery reduce a household's exposure now, regardless of what the transmission system does later.
• The interconnector improves the system, but it does not change the arithmetic of a rooftop system, a night-rate tariff or an EV charged at home.

In other words, the project is good news for the grid and for the long-term direction of prices, but it is not a reason to wait.

What Does It Mean for Renewable Generation?

A stronger link helps renewables in two ways. It allows more wind and solar power to be exported when the system is producing more than local demand, and it allows imports when the wind is low. That reduces curtailment, the waste of renewable electricity that has been one of the persistent problems on the Irish grid.

The line is also part of the wider set of projects needed for offshore wind, data centre demand and electrification of heat and transport. The planning system is already the bottleneck: several offshore wind applications are in front of An Coimisiún Pleanála, and the interconnector has spent two decades in contention.

What Should a Homeowner Take From This?

The decision is a signal about direction, not a trigger for action.

• The grid is being reinforced, which supports the case for electrifying heating and transport over time.
• The work is slow, so home generation and storage remain the fastest way to control your own bill.
• If you are planning solar, size it for the car and the heat pump you expect, not just today's usage.
• If you are planning a battery, the case rests on night rates and self-consumption, not on waiting for grid upgrades.

WattCharger's solar panel service and battery storage work is designed around the grid as it is now, with the export and connection paperwork handled as part of the job.

Final Thoughts

Confirming an overhead line after 20 years is not a popular decision locally, and the legal challenges are not over. Nationally, it is the right call if the goal is a stronger, more renewable grid by 2031. For a household, the practical lesson is that system-level change is slow, while a roof, a battery and a charger can be installed this winter and start saving immediately.

Ready to Cut Your Bill While the Grid Catches Up?

WattCharger designs solar, battery and EV charger systems for Irish homes and manages the SEAI grant and ESB Networks notification. Book a free consultation and we will show you what your roof can generate and what a battery would add at today's rates. Start with our solar panel page or read our guide to SEAI grants.