Electricity Supply Board

ESB, also known as the Electricity Supply Board, is Ireland’s principal electricity utility responsible for the generation, transmission, distribution and supply of electrical power to homes, businesses and industrial customers across the country. In addition to delivering electricity through its network, the company is actively involved in developing renewable energy projects, including onshore and offshore wind farms, and operates interconnectors that link the Irish grid to neighbouring systems. ESB also provides energy services such as metering, billing and customer support through its retail brands, and it participates in market operations that help balance supply and demand on the all‑island electricity market.

As a state‑owned semi‑state company, ESB is wholly owned by the Irish Government and is regarded as one of the largest enterprises in the energy sector on the island of Ireland. Its infrastructure encompasses a diverse portfolio of power stations, ranging from conventional fossil‑fuel plants to modern renewable facilities, and a high‑voltage transmission system that transports electricity from generation sites to distribution networks. The organisation’s scale enables it to undertake significant capital programmes aimed at modernising the grid, improving resilience and supporting the national transition to low‑carbon energy.

ESB’s distinguishing attributes include its dual role as both a system operator and a commercial energy supplier, which gives it a unique position in overseeing grid reliability while competing in the retail market. The utility has a recognised expertise in integrating renewable generation, managing intermittency and advancing smart‑grid technologies. Notably, in June 2017 ESB was targeted by Russia‑linked GRU hackers who sent phishing emails to senior engineers in an attempt to gain access to energy network control systems; although the attack was thwarted without operational impact, the incident highlighted the growing cyber‑security challenges facing critical infrastructure. Structurally, ESB Group comprises several subsidiaries such as ESB Networks, which manages the distribution system, and Electric Ireland, the retail arm that supplies electricity and gas to customers, all operating under the ownership of the Irish State.