ESB Group
Corporate brand
UnclaimedIrish state-owned electricity group operating across power generation, electricity networks, retail supply, engineering and renewable energy.
Last updated October 14, 2026
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Overview
ESB Group, originally the Electricity Supply Board, is an Irish state-owned electricity enterprise established in 1927 under the Electricity (Supply) Act. It was created by the government of the Irish Free State to develop and manage a national electricity system, initially building on the Shannon Scheme and the Ardnacrusha hydroelectric station. ESB subsequently became the central institution in Ireland’s electrification, expanding generation capacity, constructing transmission and distribution infrastructure, and extending electricity service from urban centres into rural communities. For much of the twentieth century ESB operated as Ireland’s vertically integrated electricity monopoly. The company built and ran hydroelectric, peat-fired, coal-fired, oil-fired and gas-fired generating stations, while also developing the national network that delivered electricity to homes and businesses. Its rural electrification programme, carried out mainly between 1946 and 1979, connected more than 420,000 rural customers and substantially changed domestic life, agriculture, commerce and industrial development. The programme is often regarded as one of the most significant infrastructure and social transformations in modern Ireland. ESB is now a commercial semi-state group operating in a liberalised electricity market rather than an unqualified monopoly. Its activities are divided among legally separate businesses. ESB Networks manages and maintains the electricity distribution network and owns the transmission infrastructure, although EirGrid independently operates the transmission system. ESB Generation and Wholesale Markets operates conventional and renewable generation assets and participates in wholesale electricity markets. Electric Ireland is the group’s regulated electricity supply business for households and other customers in Ireland; the business adopted that name to distinguish retail supply from network operations. ESB International provides engineering, consultancy and project services internationally, while Northern Ireland Electricity Networks operates and maintains the electricity network in Northern Ireland. The group’s generation portfolio has historically included major hydroelectric facilities, peat stations, Moneypoint coal-fired generation, gas- and oil-fired plants, Turlough Hill pumped-storage capacity, and investments in wind and other renewable technologies. ESB has also participated in joint ventures and international power projects. Some generation assets, including Tarbert and Great Island, were divested as measures to reduce market concentration following electricity-market reform. Renewable energy and decarbonisation have become central to ESB’s strategic direction. The group invests in onshore and offshore wind, solar and other low-carbon technologies while managing the retirement or transformation of older fossil-fuel facilities. In 2008, ESB announced a major long-term capital programme focused on renewable energy and emissions reduction. Its contemporary role combines utility responsibilities with commercial activity, infrastructure investment, customer supply, network resilience and support for Ireland’s energy transition. ESB’s primary home market is Ireland, with operations in Northern Ireland, the United Kingdom and international engineering and energy markets.
History
ESB was established in 1927 by the Irish Free State under the Electricity (Supply) Act. Its original purpose was to create a coordinated national electricity system after the construction of the Shannon Scheme and the Ardnacrusha hydroelectric station. Ardnacrusha was Ireland’s first large-scale electricity project and initially supplied a very substantial share of national demand. ESB used the project as the foundation for a broader programme of generation and network development. During the 1930s and 1940s, ESB planned and built additional hydroelectric stations at sites including Poulaphouca, Golden Falls, Leixlip, Clady, Cliff, Cathaleen’s Fall, Carrigadrohid and Inniscarra. Most of these facilities were completed by 1949. Although their relative contribution declined as demand grew, many remained important components of Ireland’s electricity infrastructure. A defining stage in ESB’s history was rural electrification. Beginning in the 1940s, the organisation extended lines and connections across rural Ireland, with the programme receiving additional legislative support through the Electricity Supply Amendment Act 1955. By 1979 more than 420,000 rural customers had been connected. Electricity enabled new household appliances, improved communications and productivity, and supported changes in farming, small business and rural living. The programme became known as the “Quiet Revolution” because of its broad social and economic effects. To meet rising post-war and industrial demand, ESB diversified beyond hydroelectricity. It opened North Wall station in Dublin in 1947 and developed peat-fired generation in cooperation with Bord na Móna. Lanesboro entered service in 1958, followed by Shannonbridge in 1965. ESB also commissioned Turlough Hill in 1968, Ireland’s first pumped-storage hydroelectric station, allowing electricity generated during lower-demand periods to be used to support peak demand. Industrialisation in the 1970s required substantially larger stations. Poolbeg entered service in 1971, and Moneypoint in County Clare was commissioned in 1979. Moneypoint became Ireland’s principal coal-fired facility and one of the country’s largest power stations. Later decades brought further gas-fired generation and the entry of independent generators, reducing ESB’s historic dominance. Electricity-market reform changed ESB’s institutional role. The transmission system continued to be owned through ESB Networks, but EirGrid was established as an independent transmission-system operator and began operating the system in 2006. ESB’s retail business was separated in branding terms from network operations and became Electric Ireland in 2011. The group also divested selected generation assets, including Tarbert and Great Island, under an asset-divestment strategy intended to reduce concentration in the generation market. ESB expanded beyond its traditional domestic utility functions through ESB International, which provides engineering and consultancy services, and through investments in generation and renewable projects. Its acquisition of Northern Ireland Electricity’s network business in 2010 extended its regulated network operations across the island of Ireland, although the former Northern Ireland supply business was not part of the acquisition. In the twenty-first century, decarbonisation has become a central strategic theme. ESB has developed wind and other renewable holdings, announced substantial investment in renewable technologies in 2008, and pursued the reduction and eventual transformation of higher-emission generation. The modern group therefore combines legacy public infrastructure, regulated network operations, competitive retail supply, wholesale generation, renewable development and international technical services.
- 2011
Retail supply adopts Electric Ireland name
[1]ESB’s retail supply division changes its trading identity to Electric Ireland in the liberalised market.
- 2010
Northern Ireland Electricity network business acquired
[1]ESB acquires the Northern Ireland network operation and maintenance business from Viridian.
- 2008
Renewable investment programme announced
[1]ESB announces a large capital programme aimed at renewable development and long-term emissions reduction.
- 2006
EirGrid assumes transmission-system operation
[1]Independent state company EirGrid begins operating Ireland’s national transmission system.
- 2003
Final remote communities join the national grid
[1]Inishturbot and Inishturk become connected to the mainland electricity system.
- 1991
ESB Archive established
[1]ESB creates an archive for historical records relating to the company and Ireland’s electrification.
- 1979
Moneypoint commissioned
[1]The large coal-fired station in County Clare enters service during a period of rapidly increasing electricity demand.
- 1968
Turlough Hill pumped-storage station commissioned
[1]ESB brings Ireland’s major pumped-storage hydroelectric facility into operation in County Wicklow.
- 1955
Rural electrification receives legislative support
[1]The Electricity Supply Amendment Act supports the continuing national electrification programme.
- 1947
North Wall power station opens
[1]ESB commissions a major steam-generating station at Dublin’s port area.
Products and positioning
State-owned, infrastructure-led electricity and energy group supporting Ireland’s power system and transition toward lower-carbon generation.
Electricity networks
ESB Networks
ESB Networks constructs, operates and maintains Ireland’s electricity distribution network and owns the transmission infrastructure associated with the ESB group. Transmission-system operation is performed independently by EirGrid. The business provides the physical network through which electricity reaches homes, businesses and public services, and is responsible for network connections, maintenance, resilience and infrastructure development.
Electricity retail supply · 2011
Electric Ireland
Electric Ireland is ESB’s electricity supply business serving customers in the competitive Irish retail market. It was introduced as a distinct name to avoid confusion between electricity supply and ESB’s role in operating and maintaining network infrastructure. The business supplies domestic and other customers and operates separately from the regulated network function.
Power generation
ESB Generation and Wholesale Markets
This business operates ESB’s portfolio of conventional and renewable power stations and participates in wholesale electricity markets. Its assets have included hydroelectric, pumped-storage, peat, coal, oil, gas and wind generation. The portfolio has evolved through market liberalisation, asset divestments and the increasing strategic importance of lower-carbon generation.
Engineering and consultancy
ESB International
ESB International provides engineering, technical consultancy and project services in international markets. Its activities have included power-generation projects, renewable-energy development, infrastructure advice and related technical services, extending ESB’s expertise beyond its regulated Irish network and supply businesses.
Electricity networks · 2010
Northern Ireland Electricity Networks
Northern Ireland Electricity Networks operates and maintains the electricity network in Northern Ireland. ESB acquired the network business from Viridian in 2010. The acquisition did not include the former Northern Ireland electricity-supply business, which remained with Viridian.
Pumped-storage generation · 1968
Turlough Hill
Turlough Hill is a pumped-storage hydroelectric facility in County Wicklow. It stores energy by pumping water uphill during lower-demand periods and releases it through turbines when additional generating capacity is needed. The station was commissioned in 1968 and can provide up to 292 MW, subject to reservoir limitations.
Coal-fired generation · 1979
Moneypoint
Moneypoint is ESB’s large coal-fired power station in County Clare. Commissioned in 1979, it became a major source of Irish generating capacity and has been associated with the country’s transition away from higher-emission generation as ESB pursues decarbonisation and renewable investment.
Marketing campaigns
- 2008Renewable energy and carbon reduction programme
Ireland · United Kingdom · International markets
ESB announced a major investment programme centred on renewable technologies and a substantial reduction in carbon emissions, establishing decarbonisation as a core strategic direction.
Outcome. Renewable generation became a more prominent part of the group’s portfolio and strategy.
- 1946Rural Electrification Scheme
Ireland
A multi-decade infrastructure programme extended electricity networks and customer connections throughout rural Ireland. It connected more than 420,000 customers by 1979 and helped transform household life, agriculture and rural economic activity.
Outcome. National rural electricity access expanded substantially.
Brand decisions
2011
Rebrand the retail supply business as Electric IrelandStrategyBackground
Market liberalisation made it important to distinguish the retail supplier from ESB’s network-operator responsibilities.
Action taken
The retail division adopted the Electric Ireland name, replacing the previous ESB retail identity.
Aftermath
The separate retail brand reduced potential customer confusion between competitive supply and regulated network services.
2010
Acquire Northern Ireland Electricity network businessM&ABackground
ESB sought to expand its regulated network operations beyond the Republic of Ireland.
Action taken
ESB acquired Northern Ireland Electricity’s network operation and maintenance business from Viridian.
Aftermath
ESB added Northern Ireland network operations while the former supply business remained with Viridian.
2008
Commit to large-scale renewable investmentStrategyBackground
Growing climate and energy-security concerns required ESB to reduce dependence on higher-emission generation and expand renewable capacity.
Action taken
ESB announced a €22 billion capital investment programme focused on renewable energy technology and emissions reduction.
Aftermath
The announcement positioned renewable development and eventual carbon neutrality as central elements of ESB’s long-term strategy.
Announced capital investment programme. €22 billion (Announced 27 March 2008; long-term programme)
2006
Separate transmission-system operation from ESB operationsStrategyBackground
Electricity-market reform required a more independent transmission-system operator in Ireland.
Action taken
EirGrid began operating the national transmission system while ESB Networks retained ownership of the transmission infrastructure.
Aftermath
Transmission-system operation and infrastructure ownership became institutionally distinct, supporting a liberalised electricity market.
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