Belfast High Court proceedings resume on Tuesday in a legal challenge to the proposed north-south electricity interconnector. The case was lodged in November 2025 by the campaign group SEAT, which represents residents and landowners in counties Armagh and Tyrone.

The interconnector plan, first conceived in 2006, would link the electricity grids of Northern Ireland and the Republic of Ireland. The current challenge concerns decisions by the Department for Infrastructure regarding pre-commencement planning conditions for construction of over 100 electricity pylons carrying 400kV cables across 34 kilometres of countryside.

SEAT has argued that the infrastructure should be placed underground or reconsidered entirely, citing concerns about industrialisation of rural areas. The group states it represents more than 6,500 residents and dozens of farmers.

John Woods, a spokesperson for SEAT, said Northern Ireland consumers pay the highest electricity prices in Europe. He claimed a significant portion of charges on electricity bills funds what he described as waste and mismanagement in the interconnector project.

Woods said the project has no discernible benefit to Northern Ireland consumers or the wider economy, and is instead being built to facilitate the expansion of data centres in Ireland. He called on the Northern Ireland Executive and Irish Government to explain the type of electricity system being built and its intended beneficiaries.

Woods referenced a temporary pause by Denmark in March 2026 on new transmission-grid connection agreements due to demand from data centres. He said that debate should occur before further commitments are made.

The System Operator for Northern Ireland, which operates the energy grid, did not comment on the legal proceedings. In 2025, the operator told The Guardian that remarks characterising the interconnector's purpose as powering data centres were inaccurate and unfair.

The current judicial review follows previous legal actions. In 2017, the High Court in Belfast rejected a challenge by the North East Pylon Pressure Campaign against planning approval granted by An Bord Pleanála in the Republic. In 2019, objectors in Northern Ireland succeeded in having planning approval quashed, with the court finding the decision required direct political oversight from a government minister.