Becoming a Customer in Northern Ireland

Getting Connected

SONI is Northern Ireland’s independent Transmission System Operator. Customers should note that SONI does not buy or sell electricity, but facilitates the connection of generation and large scale demand customers to the Transmission System.


If you are seeking a connection to the Transmission System in Northern Ireland, please click below. For more information relating to connections to the Distribution System in Northern Ireland, please visit the NIE Networks website.

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Connection Process

The process for connection to the Northern Ireland Transmission System can be found by clicking below.

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Electricity suppliers sell electricity to electricity customers (domestic, commercial, or industrial) utilising the electricity system which is operated by SONI at transmission level and by NIE Networks at distribution level.

To find out more about becoming a supplier of electricity in Northern Ireland, click below.

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