The TSO also offers terms and levies charged to market participants to connect to and use the transmission system regulated by the CRU.

The Distribution Network includes all overhead electricity lines, poles, and underground cables used to bring power to Ireland's customers.

Since April 2011, the domestic market has been deregulated so that all electricity suppliers may set their tariffs without price regulation from the CRU.

The decision-making body that governs the market is the SEM Committee, consisting of the CRU, the Utility Regulator, as well as an independent member (who also has a deputy), with each entity having one vote.

At a high level, the SEM includes a centralized gross pool (or spot) market, which, given its mandatory nature for key generators and suppliers, is fully liquid.

Suppliers purchasing energy from the pool pay the SMP for each trading period along with capacity costs and system charges.

Ervia, formerly Bord Gáis Éireann (BGE), owns the transmission and distribution systems in the Republic of Ireland.

The CRU sets the allowed revenue/tariffs and connection policy for the gas transmission and distribution network (similar to electricity).