Band 6+: the diagram below shows how geothermal energy is used to produces electricity. summarise the information by selecting and reporting the main features and make comparisons where relevant.

The diagram illustrates the process of generating electricity in a hydroelectric power station.

The process begin with the flow of water from a river into a high level reservoir , controlled by a dam.

During the day , water is released from the reservoir through an intake , which is kept open , allowing water to flow downward through pipes to a power station. The kinetic energy of the flowing water drives the generator ,which produces electricity and the supplied via power line to the national grid for distribution.

At night, the process is reversed. The intake is closed and water from low level reservoir is pumped back to the high level reservoir using reversible turbines. This turbine works as a pump moving the water to uphill,ready to be used again during the day for electricity generation.

Overall, the hydroelectric power station operates in a cyclical manner,generating electricity during the day and conserving energy by pumping water back to the high level reservoir at night.