Since the Single Electricity Market (SEM) came into effect on the 1st November 2007 introducing a single wholesale market for electricity on the island of Ireland, the Commission for Energy Regulation (CER) and the Northern Ireland Authority for Utility Regulation (NIAUR), together the Regulatory Authorities (RAs) have implemented a number of measures to promote competition with the retail markets across the island. The RAs agreed that harmonisation of the retail markets will further the common objectives of encouraging competition in supply markets and improving quality of service to all customers.

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