SSE has reached a final investment decision to proceed with its 100MW Derrymeen battery energy storage system (BESS) in County Tyrone, advancing plans to support Northern Ireland's shift to a renewables-led electricity system.

Sited beside the Tamnamore 275/110kV substation near Dungannon, the facility will provide two hours of storage (200MWh) and connect directly to the substation. It will participate in the all-island Integrated Single Electricity Market (SEM).

Once in service, the scheme will help balance the grid and bolster security of supply by storing electricity when generation is high and releasing it back when demand rises. The project will add flexible storage capacity to enable greater penetration of renewable generation and strengthen Northern Ireland's electricity network.

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Early works, including detailed design and the procurement of key equipment such as the main grid transformer, are already under way, with full construction scheduled to follow later in 2026. Grid connection activities will be coordinated with the System Operator for Northern Ireland (SONI) and Northern Ireland Electricity Networks (NIE).

The build phase is expected to create local employment and supply chain opportunities, supporting up to 30 full-time jobs at peak through engagement with regional contractors and suppliers.

Heather Donald, Director of Projects Onshore Ireland at SSE Renewables, said: "Securing a final investment decision for Derrymeen marks another important milestone in our commitment to building a flexible and resilient energy system across the island of Ireland.

"Battery storage is essential to enabling a renewables-led electricity system, helping to store clean power when it is available and deliver it back to the grid when it is needed most. We are proud to be investing in Northern Ireland's energy future, working closely with our partners and stakeholders to deliver a project that supports security of supply and the energy transition."

Following design refinements and engagement with the local council, the project has progressed to final investment decision. It has also secured a 10-year Capacity Remuneration Market (CRM) contract beginning in October 2028.