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Pumped storage plant and benefit to Nepal

Short answer

Pumped storage uses two reservoirs: off-peak surplus electricity pumps water uphill; peak demand releases it to generate power. Nepal benefits by utilizing monsoon surplus, meeting evening peak, providing grid stability (frequency control), reducing dry-season imports, and supporting intermittent renewables like solar and wind.

What do you mean by a pumped storage power plant? How can it benefit Nepal's power sector?

A pumped storage power plant has two reservoirs at different levels. In off-peak hours (night or monsoon surplus) the reversible pump-turbine uses cheap surplus electricity to pump water from the lower to the upper reservoir. In peak hours the water is released back through the turbine to generate power. The cycle efficiency is about 70-80%.

Benefits to Nepal

  • Peak power: It meets the evening peak with stored energy.
  • Use of monsoon surplus: Nepal has surplus RoR energy in the wet season, which would otherwise be spilled, and this can be stored.
  • Grid stability: Gives fast frequency control and spinning reserve.
  • Dry season support: Reduces the import from India and improves energy security.
  • Needs less water than a storage dam, because the same water is reused, and can be built on a hill near the load centre.
  • Supports intermittent sources such as solar and wind.
  • Lower environmental effect than a large dam.

✓ Answer checked by Claude Opus 5.5 (high effort)

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