Detailed Explanation:

Correct Answer: ✅ Long Duration Energy Storage (Option C)

Pumped-Storage Hydropower (PSH) is often called a "water battery." It stores excess electricity by pumping water from a lower reservoir to a higher reservoir and releases it later to generate electricity when demand increases.

This technology is increasingly important for integrating renewable energy sources like solar and wind, which are intermittent in nature.

❌ Irrigation of terraced crop fields: PSH is designed for energy storage, not agricultural irrigation.

❌ Lift irrigation of cereal crops: Although pumps are used, the primary objective of PSH is electricity storage and grid balancing.

✅ Long Duration Energy Storage: PSH is one of the world's most widely used and mature technologies for storing electricity over long periods.

❌ Rainwater harvesting system: Rainwater harvesting focuses on water conservation, not electricity storage.

Short Notes: Pumped-Storage Hydropower (PSH)

• PSH is the largest grid-scale energy storage technology in the world.

• It uses two reservoirs at different elevations.

• During low demand, water is pumped uphill using surplus electricity.

• During peak demand, water flows downhill through turbines to generate power.

• Round-trip efficiency is generally around 70–80%.

• PSH helps integrate solar and wind energy into the power grid.

• It provides long-duration energy storage and grid stability.

• India is promoting PSH projects to support its renewable energy transition.