Hydro-power for the people
• The ESB's first hydroelectric power station was completed in 1929 at Ardnacrusha, Co Clare.
• The scheme was constructed by Siemens of Germany with 4,000 Irish and 1,000 German workers for £5.2m.
• It is the country's largest river hydroelectric scheme and is operated on a purpose built canal connected to the Shannon river.
• The scheme harnessed the power of the Shannon by building a power station and a network to transmit the electricity throughout the country.
• When built, the plant was the largest of its kind in the world and could meet the electricity demand of the entire country. It now accounts for 2pc of Ireland's requirements.
• The Shannon scheme has served as a reference model for other major engineering projects worldwide.
• Among those to take an interest was former US President Franklin D Roosevelt, who consulted ESB and passed on information to the Tennessee Valley Project designers.