SONI
SONI is Northern Ireland's electricity Transmission System Operator, operating the transmission grid from its control centre in Belfast.
Last updated September 16, 2026
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Overview
SONI is Northern Ireland's electricity Transmission System Operator. It develops, plans and operates the transmission system in Northern Ireland, ensuring power flows from where it is generated to where it is needed. From its control centre in Belfast, SONI balances demand and supply of electricity and plans for Northern Ireland's future energy needs. It does not generate or sell electricity. Together with EirGrid, its counterparts in the Republic of Ireland, it also operates the all-island wholesale electricity market through the Single Electricity Market Operator (SEMO).
History
SONI is Northern Ireland's electricity Transmission System Operator. It develops, plans and operates the transmission system in Northern Ireland, ensuring power flows from where it is generated to where it is needed. From its control centre in Belfast, SONI balances the demand and supply of electricity every second and plans for Northern Ireland's future energy needs. SONI does not generate or sell electricity. Working together with EirGrid, its counterparts in the Republic of Ireland, SONI also operates the all-island wholesale electricity market through the Single Electricity Market Operator (SEMO).
Products and positioning
Northern Ireland's electricity Transmission System Operator, leading the way for a more secure and sustainable energy future.
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