Our five hydroelectric stations have a combined production capacity of 220MW located on five rivers across Ireland. Together, they provide enough renewable electricity to supply approximately 180,000 homes, farms and businesses, contributing to our Driven to Make a Difference: Net Zero by 2040 strategy.
Our Lee Stations watches the Met Eireann weather forecast and lowers the levels in both Carrigadrohid and Inniscarra reservoirs when significant rainfall is forecast, as was the case in February 2025. Read more about our efforts to minimise impact during significant rain efforts earlier this year.
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We have a statutory role to generate electricity at Ardnacrusha as outlined in the Shannon Electricity Act 1925, Electricity Supply Act 1927 and Electricity Supply (Amendment) Act 1934. In broad terms, this legislation permits us to generate electricity at our Ardnacrusha generation station in Co Clare and to manage the weirs, sluices and other works that are part of the Shannon Scheme.
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We continuously measure the water levels and flow and provide daily/hourly hydrometric information for each of the hydro stations we manage. We have to carefully manage water levels at their reservoirs during floods or drought, closely monitoring rainfall throughout the year to plan necessary works and anticipate action in response to adverse weather events.
When rain events occur, we seek to store or divert the large inflows of water to minimise the risk of flooding. As all our hydro stations and the river systems where they operate are unique, there are different options available to deal with these situations when they occur.
Our Ardnacrusha Generation Station in Co Clare has an important role to play in diverting water from the main River Shannon during a flood event.
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During a flood, water levels at Parteen Basin are managed to ensure they remain within the safe operating band by not releasing too much or too little water from Parteen Weir.
