100kW twin screw project operating on only 1.5m head

An ultra low head scheme operating on only 1.5m head and producing 100kW from twin screws was commissioned near Inverness ahead of schedule and is now delivering power to the local farm. The river level upstream varies throughout the day by up to 700mm because of sudden water releases from a large hydropower station upstream, requiring a unique design with each screw set at a different height to optimise generation. It also required two fish passes operating at different levels, and an automatic bypass sluice gate to maintain ecological flows at all times.