Band 6+: You should spend about 20 minutes on this task. The diagram below shows how electricity is generated in a hydroelectric power station. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. Write at least 150 words.

The given diagram depicts the generation of hydroelectricity and the processes involved to generate such electricity.

The process of generation of electricity using water includes collecting and storing water from the river using a high-level reservoir and a dam. The dam gates are opened in the day to let the water flow towards a downward hill slope towards the power station and into the low-level reservoir. Such station uses reversible turbines that turn continuously due to the water current to produce energy which is transferred to the generator. However, during the night water from low-level reservoir is pumped back into the high-level reservoir, repeating the process every day.

This generator collects the energy produced by the reversible turbines and converts it in to electricity. This electricity now produced is transferred further to the national grid using power lines from where it reaches homes and factories across the country. Hydroelectricity is an excellent alternative to the natural resources and help in combatting the fast rate of depletion of such natural resources like coal.