A revolutionary renewable energy method based on an Archimedes screw and an ABB motor and variable speed drive is saving Yorkshire Water over £127,000 a year in electricity costs.
The application, designed by Archimedes screw manufacturer Spaans Babcock in conjunction with civil contractor JN Bentley and installed at Esholt treatment works near Bradford, uses two Archimedes screw turbines in series. Each turbine is connected to an ABB 110 kW standard AC induction motor and ABB industrial drive used in a generator mode. The two generators produce a total of 180 kW of power and operate 24 hours a day, every day. The electricity generated from the hydro-turbines is used to reduce the imported power demand of the treatment works, saving £350 a day in imported electricity costs.