IN Brief:
- Mid and East Antrim Borough Council has approved the proposed Ballyross battery storage development.
- The four-hour installation is described as offering up to 120 MW and 480 MWh.
- RES expects construction to take around 20 months; no operational start date is confirmed.
RES has secured planning consent for its Ballyross battery energy storage project in County Antrim, marking the renewable energy developer’s first approved battery development in Northern Ireland. Mid and East Antrim Borough Council’s Planning Committee approved the project on land around two kilometres south-west of Gleno and 8.5 kilometres south-west of Larne. Trade reporting puts the approved project at up to 120 MW and 480 MWh, equivalent to four hours of discharge at rated output. The planning approval enables the development to progress, but construction and grid energisation have not been confirmed.
The proposed site is close to Ballyvallagh substation, a location RES says should support its interaction with the electricity network while limiting the need for new infrastructure. Large batteries connect to the power system through conversion and transformer equipment, absorbing electrical energy when it is available and discharging it when network conditions or demand make that useful. The power rating measures the instantaneous level at which a system can charge or discharge; the energy rating indicates how much electricity it can store. Both figures matter when evaluating a four-hour development, although actual operation depends on state of charge, dispatch and technical constraints.
Northern Ireland’s electricity system must accommodate periods when renewable generation exceeds what the network can accept or deliver to consumers. At those times, energy from wind and other sources can be curtailed despite the availability of generation. A battery connected at a suitable network point can store some of that otherwise constrained production for later use. Its value is not simply to increase installed capacity but to shift delivery across time and provide flexible response to changing system conditions. RES has identified grid flexibility as a benefit of Ballyross, without quantifying expected annual curtailment savings or a contracted volume of grid services.
The planning application was validated in November 2025. The developer then submitted further information in June 2026 following comments from consultees. Planning material includes ecological clarifications, a landscaping mitigation plan, drainage information and material addressing firewater mitigation. These documents indicate that the assessment considered the physical site and operational safeguards as well as electricity infrastructure. They should not be read as proof that every detailed design or construction method has been settled. The local planning reference is LA02/2025/0842/F, and the decision represents a development consent rather than a certificate of operational readiness.
Battery developments require planning and grid engineering to progress together. Equipment layouts must provide room for batteries, power conversion systems, transformers, access routes and safety provisions. Grid interfaces must then be designed to meet the relevant technical requirements for protection, control and the behaviour of the installation under fault conditions. The approved Ballyross location provides a framework for these next steps. RES has not confirmed a civil works start date, battery supplier, engineering contractor or firm commercial operation date. None of those milestones can be inferred from the planning decision.
Peter Deeney, senior development project manager at RES, said the approval was an important step in a Northern Ireland programme that the company has supported from its Larne office since the early 1990s. He linked battery development to the need for a more flexible system as renewable generation grows. The company also highlighted consultation with local residents and other stakeholders during planning. Those responses informed the landscape plan, according to RES, alongside the choice of a site intended to have limited visibility from nearby homes. The company has not quantified any expected local electricity price effect.
A substantial native-species planting programme is included in the approved development. RES says this will help screen the installation and establish wildlife corridors and resources for pollinators. Landscaping commitments are distinct from the battery’s electrical purpose but form part of the permitted scheme. The project will still need to move from approved drawings to detailed engineering, delivery and construction. RES estimates that the construction phase will take around 20 months, which provides an indicative duration rather than a confirmed calendar for bringing the asset online.
For the Northern Ireland grid, the next substantive milestones will be evidence that the project can be delivered on the consented site and connected under agreed technical arrangements. The 120 MW figure describes possible instantaneous power, while 480 MWh is a storage energy specification rather than electricity generated by the project itself. Actual output will depend on prior charging and the operating strategy. With permission now secured, Ballyross joins the region’s prospective flexibility infrastructure, but its contribution to the electricity system remains conditional on construction, commissioning and eventual operation.
