The provided diagram illustrates the operational cycle of a hydroelectric power station, detailing how it generates electricity and manages water storage over a 24-hour period. Overall, the system functions by releasing water from a high-level reservoir during the day to produce power, and then pumping it back up from a low-level reservoir at night, thereby acting as an energy storage mechanism. During daylight hours, the process commences with water from a river feeding into a high-level reservoir, which is retained by a dam. The intake for this reservoir is opened, allowing water to flow downwards through a large pipe towards the power station. Inside the station, the force of the descending water drives reversible turbines, which in turn activate a generator to produce electricity. This generated power is then transmitted via power lines to the national grid. Subsequently, the water that has passed through the turbines is discharged into a lower-level reservoir. Conversely, at night, when electricity demand is typically lower, the system switches to a water pumping phase. The intake from the high-level reservoir is closed. The reversible turbines, now operating in reverse, draw water from the low-level reservoir and pump it back up into the high-level reservoir. This nightly operation effectively refills the upper reservoir, preparing it for the next day's electricity generation cycle, thus ensuring a continuous and sustainable power supply.
Key Vocabulary