is the State-owned electric power transmission operator. It is a public limited company, registered under the Companies Acts. EirGrid aims to deliver quality services to all electricity customers. It manages power generation capacity to meet customer demand, which varies on a daily, weekly and seasonal basis. Available generation must match customer demand on an instantaneous basis, to maintain the electricity system. EirGrid was established to act as the independent Transmission System Operator (TSO), in line with the requirements of the EU Electricity Directive. EirGrid became operational as the TSO on 1 July 2006.