NI's biggest power generator plans to build a huge battery facility that can store energy produced by wind farms. AES, owner of Kilroot and Ballylumford power stations, plans to build the 100 mega watt (MW) facility at Kilroot. The company claims the facility will lower the cost to consumers, help meet renewable energy targets and improve the flexibility of the local grid. It says that depending on "a suitable commercial agreement" it could have the facility operational early in 2015. It has submitted a connection application to System Operator Northern Ireland (SONI), which operates the electricity grid in Northern Ireland.