EirGrid’s newly published network strategy includes the long-delayed North-South electricity interconnector between counties Meath and Tyrone, a project first conceived more than 20 years ago. The 138km overhead line is now scheduled for completion by 2031.

The interconnector has faced repeated setbacks, including an error that forced withdrawal of an early planning application and subsequent legal challenges. Two official reviews ruled out placing the line underground, and it will be built on pylons. EirGrid stated that the project now has full planning and legal consent.

Wind Energy Ireland has blamed the lack of the interconnector for forcing the shutdown of up to 30 per cent of available wind-generated electricity in Northern Ireland because of grid bottlenecks.

Once operational, the interconnector is expected to cut electricity costs across the island by an estimated €100 million per year, EirGrid said, adding that delays have kept consumers from realising those savings.

The line is part of a wider €6 billion programme to add 450km of new transmission lines and upgrade 1,000km of existing circuits. EirGrid’s strategy document forecasts that electricity demand will more than double by 2050, driven by new renewable generation, including offshore and onshore wind, solar and battery storage.

Last year, the Irish government and regulators approved almost €19 billion in spending on the national electricity network. The investment is intended to support housing growth, regional development and the connection of large volumes of renewable energy.

EirGrid chief executive Cathal Marley said reliable electricity underpins investment, housing delivery and innovation. Chairman Brendan Tuohy argued that electricity is becoming the foundation of society, not simply one part of the economy.