System Operator for Northern Ireland Ltd (S.O.N.I. Ltd)

S.O.N.I. Ltd is a wholly owned subsidiary of Northern Ireland Electricity, a member of the Viridian Group of companies. Located in Castlereagh House Control Centre in the Castlereagh hills, the System Operator plays a central role in the energy marketplace.

The Control Centre is manned 24 hours a day, and ensures the safe, secure and economic operation of the high voltage electricity grid. Under regulation from OFREG, S.O.N.I. Ltd also manages the commercial agreements with Generation companies and is the facilitator for the emerging energy marketplace in addition to the role of settlements system administrator.