The traditional Archimedean screw is now being used for low-head hydro-generation projects.
An efficient use of water power is already achieved at a level difference of 1 meter and a capacity of 500 l/sec.
The largest capacity and level difference for hydropower screws is as much as 15000 l/sec. at 10 meter. Benefits of hydropower screws include high efficiency (up to 86%), simple installation, low maintenance costs and self-regulating to changing water flow.
The screws are also extremely fish-friendly and insensitive to clogging. In Switzerland, Hirschthal, A hydropower screw was recently installed in Hirschthal, Switzerland. The screw is 2.8 m diameter, 10 m long, and with a capacity of 3,500 l/sec.
Power generation is 110 kW with a head of 3.5 m. At the beginning of September, 2011, two large hydropower screws with screw troughs and drive units have been transported to Windsor, UK. These screws will generate sustainable energy (185kW) for local use and for the Queen's Windsor Castle. Screw diameter is 4 m and screw length 5.8 m.