Correct option is C
Pumped-storage hydropower is a type of hydroelectric power generation used primarily for long-duration energy storage. It operates on the principle of moving water between two reservoirs at different elevations to store and generate electricity:
- During periods of low electricity demand (or when excess electricity is available, such as during the night or from intermittent renewable sources like wind or solar), water is pumped from a lower reservoir to an upper reservoir. This process stores energy in the form of gravitational potential energy.
- During periods of high electricity demand, the stored water is released from the upper reservoir back down to the lower reservoir, passing through turbines to generate electricity. This technology is highly efficient for balancing the grid, providing backup power, and enabling the integration of renewable energy sources, which can be intermittent in nature.
