Hydro-electric power uses...

Hydro-electric power uses the power of moving water to generate electricity. It works by using the kinetic energy of the water to turn turbines and generators. The turbines force water through a pipe, which turns the generators, producing electricity. This method of power production is renewable and relatively inexpensive, making it an ideal form of electricity generation. Since it does not produce any emissions, hydro-electric power is also environmentally friendly.

falling water, through turbines, No pollution. BIG impact on the environment due to flooding + loss of habitats. Provide immediate response. Reliable except in drought. High costs. No fuel costs + minimal running costs. Generates on small scale.