Station: Ardnacrusha
County: Clare
Fuel type: Hydro
Capacity: 86MW
Status: Active
Commissioned: 1929
Upgraded: 1934
Ardnacrusha has the distinction of being ESB’s first hydro station. It is also Ireland’s largest river hydroelectric scheme and operates on a purpose-built canal connected to the Shannon.
Ardnacrusha was a ground-breaking development in 1929 and unique in that the national grid (110kV) was constructed at the same time. For these reasons, it was a model for large scale electrification schemes worldwide. At the time, the 86 MW capacity was enough to meet the electricity demands of the whole country. Today, Ardnacrusha represents around 2% of our total installed capacity.
It utilises three Vertical-Shaft Francis Generators (Units 1, 2 and 3 – 1929) and one Kaplan Turbine Generator (Unit 4, 1934). Water is delivered to the turbines by four large, cylindrical steel structures known as penstocks. Each penstock is 41m long, 6m in diameter and can deliver around 100 tonnes of water per second.
Ardnacrusha Station featured on Atlantic Tales, Clare FM radio documentary, broadcast on 4th Sept 2022. Pat Flynn visited the station to find out all about its fascinating history. The programme includes interviews with station manager, Brendan Shine, colleague Dermot Finnan and ESB Senior Archivist, Tanya Keyes.
For more information about Ardnacrusha Generating Station, see the documents below:
Ardnacrusha PR Pamphlet, 1970s
Ardnacrusha PR Pamphlet, 1980s
Ardnacrusha Fisheries and Weir (from “A Heritage Inventory of ESB Buildings in Ireland” )
