Archimedes Screw

[sharpener]

There's one down in Totnes. Doesnt look as big. Am presuming it's plugged into a generator.

Just seen this. It's 2 x 150 kW units so one of the bigger installations. https://tresoc.co.uk/project/totneshydro/

Went on a guided tour once, the actual generators are surprisingly small. The output is (or was) all sold to an aluminium casting works in the town and IIRC it was more economical (i.e. they got a better price for it) by laying 1 km of cable there rather than sending it via the local distribution network.