The diagram shows how a hydroelectric power station functions, demonstrating the process of electricity generation during the day and the method used to pump water back into the system at night.
In essence, the operation is a continuous cycle. Water flows from an elevated reservoir to produce electricity during daylight hours, while energy is used at night to pump the water back to the higher reservoir for future use. This method ensures a steady supply of electricity and helps conserve water for ongoing energy generation.
Throughout the day, water from the high-level reservoir, which is supplied by a river, flows through an open intake and drives turbines that can operate in reverse, which are connected to a generator. These turbines convert the kinetic energy of the water into electrical energy, which is then transmitted to the national grid. After the water passes through the turbines, it is collected in a lower reservoir.
At night, the intake is closed, and the station switches to pumping mode. In this phase, the turbines reverse their direction and use electricity from the grid to pump the water back from the low-level reservoir to the high-level reservoir, setting up the system for the next day’s electricity generation c
ycle.