The Energy Services Union {of Ireland} (Aontas Oibrithe Fuinnimh {na hEireann} is a trade union representing workers at the ESB Group in Ireland. As of 2024 ESU is the last "in-house" trade union left in Ireland.
Until the late 1950s, most staff at the Electricity Supply Board (ESB) were represented by the Amalgamated Transport and General Workers' Union. In 1959, a strike among clerical staff at the ESB was unsuccessful, and this led the clerical section to found a new union, Electricity Supply Board Officers' Association (ESBOA). By the following year had a membership of 1,116, growing to 1,800 ten years later, and 3,005 in 1990. It affiliated to the Irish Congress of Trades Unions in 1976. David Begg became its general secretary in 1982, serving for three years.John B. Smethurst and Peter Carter, Historical Directory of Trade Unions, vol.6, p.370
By 2012, the union also had members working for Endesa, EirGrid and Airtricity, and as a result it renamed itself as the "Energy Services Union [of Ireland]".
Presidents 1986-90 Delores "Delo" Collier 1990-94 Paddy Reilly 1994-98 Tony Mullins 1998-2002: Philomena Harrington 2002-06: John Nugent 2006-10: Dave Byrne 2010-13: Treasa Ni Mhurchú 2013-17: Ann Lynch 2017-21: Karen Halpenny 2021-25: Anthony Kelly 2025- : Karen Halpenny
General Secretaries 1960: Franklin O'Sullivan 1964: N. Farrelly 1965: R. Kinch 1968: R. McElroy 1969: E. Harpur 1972: Louis Gillick 1975: Micheál Ó Foghlú 1978: John Mitchell 1982: David Begg 1985: John Hall 1991: Willie Cremins 2008: Tony Dunne 2010: Fran O'Neill 2024: Karan O'Loughlin
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