Research and analysis

Effects of run-of-river hydroelectric power schemes on fish

Investigates the effects of small-scale hydroelectric power schemes on fish.


Effects of run-of-river hydroelectric power schemes on fish

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email Please tell us what format you need. It will help us if you say what assistive technology you use.


This project investigated small-scale hydroelectric power (HEP) schemes with the aim of improving understanding of the environmental effects of HEP schemes in rivers. The study looked at changes in fish communities from run-of-river HEP schemes compared with a set of control sites without hydropower across a range of river types and locations. The research showed that the impact of these schemes on fish is limited, although the small number of samples means that subtle changes may not have been detected.

Published 13 September 2016