High Quality Content by WIKIPEDIA articles! Ardnacrusha power plant is a hydroelectric power station which was originally referred to as The Shannon Scheme. It is located near Ardnacrusha within County Clare approximately 1.5 miles (2.4 km) from the Limerick border. It is Ireland`s largest river hydroelectric scheme and is operated on a purpose built canal connected to the River Shannon. The plant includes fish ladders so that returning fish, such as salmon, can climb the river safely past the power station.