Hydro - Habitats

Hydroelectric power systems affect the flow regime and can have a significant impact of local fisheries, the scale of which depends on the location, design, type, size and operation methods of the hydro scheme. Hydro can cause a permanent (or temporary during construction) obstruction for migratory fish, such as salmon. Fish passing through the turbines are at risk from injury or death and the impact on flow regime can affect fish both up and downstream of a hydro plant.

There is also risk of pollution to water courses during construction and operation of a hydroelectric system. Where a hydro plant does pose a potential threat to fisheries, planning conditions may include measures to protect fish, such as the provision of a fish pass and screening to prevent fish entering the turbines. In this section you can find information about legislative requirements for fish screening and fish passes.