|Affiliation||Irish Congress of Trade Unions|
|Key people||Fran O'Neill (General Secretary)|
|Office location||43 East James's Place, Dublin|
The union was founded in 1959 as the Electricity Supply Board Officers' Association, and by the following year had a membership of 1,116, growing to 1,800 ten years later. It affiliated to the Irish Congress of Trades Unions in 1976. David Begg became its general secretary in 1982, serving for three years.
In 2012, the union renamed itself as the "Energy Services Union".
- 1982: David Begg
- 1990s: Willie Cremins
- 2000s: Fran O'Neill
- Energy Services Union, "How we work"
- John B. Smethurst and Peter Carter, Historical Directory of Trade Unions, vol.6, p.370