Fuel type: Hydro
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.
Click the images below for more information relating to the operation of the Shannon Scheme, including both Ardnacrusha and the Parteen Weir.