Construction of the BESS is set to commence later in 2026.
This facility is intended to assist the region's transition to an electricity grid increasingly powered by renewable sources.
The Derrymeen installation will be positioned adjacent to the Tamnamore 275/110kV substation near Dungannon. It will offer 100MW of power capacity along with two hours of storage duration, corresponding to 200MWh total energy storage.
The system will connect directly to the substation and participate in the all-island Integrated Single Electricity Market.
Once in service, the battery storage will help maintain grid stability by absorbing excess renewable electricity during periods of abundant generation and supplying it back when demand rises.
Construction activities are scheduled to begin later in 2026, following ongoing preparatory work that includes detailed engineering design and procurement of key components, such as the primary grid transformer.
Coordination for grid connection will involve collaboration with the System Operator for Northern Ireland and Northern Ireland Electricity Networks.
The development is also projected to generate employment opportunities, supporting as many as 30 full-time positions during the peak construction period.
SSE Renewables director of projects onshore Ireland Heather Donald 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."
The project advanced to this stage after completing necessary design adjustments and engaging in consultations with local authorities.
Furthermore, the facility has secured a ten-year contract in the capacity remuneration market, with the agreement commencing in October 2028.
These steps underscore SSE's ongoing investments in energy storage solutions to enhance grid reliability and facilitate greater integration of renewable generation.
Battery systems like Derrymeen play a vital role in modern electricity networks by addressing the variable nature of sources such as wind and solar power. They enable efficient management of supply and demand fluctuations, contributing to overall system efficiency.
The location near an existing substation optimizes technical integration and minimizes additional infrastructure requirements.
Local economic benefits extend beyond construction, as the project aligns with broader goals for sustainable energy development in the region.
In a separate initiative earlier this year, in August 2024, SSE initiated site preparation work for the Aberarder wind farm, another major renewable energy development situated in the Scottish Highlands.
This portfolio of projects reflects continued efforts to expand clean energy capacity and storage across the United Kingdom and Ireland, supporting long-term objectives for a more sustainable and secure power supply.
