The diagram illustrates the process of electricity generation in a Hydroelectric power station by natural resources. Overall, it can be seen that this station produces electricity with the power of water which is flowing by a river in three general steps.
As can be seen from the diagram, during the day, because of gravity the water passes through the intake making rotate some turbines inside the power station, before ending in a low-level reservoir where is collected. Therefore, the movement of the turbines, because they are attached to a generator, thanks to hydroelectric power electricity is generated. Afterwards, it is transported to the national grid thanks to power lines.
The last phase is that during the night the opposite happens, from the low-level reservoir, the water is directed back to the highest one. This is possible thanks to the previously mentioned turbines, in fact, they are reversible, consequently able to pump the water back to the intake to refill the high-level reservoir.