There is considerable potential for micro hydro electricity in the UK. Micro hydro refers to hydro power systems with a power rating of 100kW or less.
If you have a water course with a sufficient flow rate and head of water, why not use it?
Electricity is produced by channeling a body of water, such as a damned stream, a flowing river, or a water body with a sufficient fall in height into a turbine. This turbine then produces electricity and ejects the water back into the original source further downstream.
It can provide clean free energy 24 hours a day all year round, rainwater permitting!
Most systems will last for forty or fifty years with low running and maintenance costs.
Micro hydro generation is eligible for RHI index-linked payments over twenty years.