The Single Electricity Market (SEM) is the wholesale electricity market operating in the Republic of Ireland and Northern Ireland. As a gross mandatory pool physical market operating with dual currencies and in multiple jurisdictions the SEM represents the first market of its kind in the world.

The Single Electricity Market provides for a competitive, sustainable and reliable wholesale market in electricity aimed to deliver long-term economic and social benefits that are mutually advantageous to Northern Ireland and the Republic of Ireland.

The market encompasses approximately 2.5 million electricity consumers, 1.8 million in the Republic of Ireland and 0.7 million in Northern Ireland.

The Single Electricity Market Operator (SEMO) facilitates the continuous operation and administration of the Single Electricity Market. SEMO is a joint venture between EirGrid plc and SONI Limited. For more information about SEMO please see About SEMO...