How does the Snowy 2.0 hydroelectric system work?

Question

BlackTom AI · Accepted Answer

Pumped hydro stores energy by moving water between two reservoirs; Snowy 2.0 pumps water uphill when there is surplus electricity and lets it flow back down through turbines to generate power when demand is high.

1) Relevant knowledge points and concepts
- Pumped hydro energy storage: uses excess electrical energy to pump water to an upper reservoir, storing potential energy; releasing water back through turbines converts that potential energy to electricity.
- Reversible pump-turbines: machines that act as pumps (consume electricity) or turbines (produce electricity) depending on direction of flow.
- Supply–demand balancing: storage systems soak up surplus generation (e.g., wind/solar) and supply power during peaks.

2) Step-by-step reasoning
- When generation (or low demand) produces excess electricity, that electricity drives pumps to move water from a lower reservoir to an upper reservoir—energy is stored as elevated water.
- When electricity demand rises, valves open and water flows back down through the same or other turbines, converting potential energy to electrical energy and supplying the grid.
- Control systems schedule pumping/generation based on real-time supply-demand signals and market prices.

3) Calculation example and intermediate steps (energy stored)
- Energy stored = m · g · h, where m = mass of water (kg), g = 9.81 m/s^2, h = head (m).
- Example: 1,000,000 kg of water lifted 100 m: E = 1,000,000 × 9.81 × 100 = 981,000,000 J.
- Convert to kWh: 981,000,000 J ÷ 3,600,000 J/kWh = 272.5 kWh stored (before losses).

4) Why the correct answer is correct
- The phrase "It controls the movement of water based on supply-demand" precisely describes pumped hydro operation: moving water up or down depending on grid conditions. Snowy 2.0’s core function is exactly this supply–demand control via reversible pumping/generation.

5) Why the other options are incorrect
- "It uses the water coming from melting snow to move turbines": misleading—Snowy schemes use stored reservoir water, not primarily seasonal snowmelt as the operating principle.
- "It uses flowing water and turbines to generate water": nonsensical—turbines generate electricity, not water.
- "It moves water to nearby factories to generate energy": incorrect—water is moved between reservoirs to store energy for the grid, not specifically to factories.

6) Conclusion
The correct description is that Snowy 2.0 controls the movement of water based on supply and demand, which matches the provided answer.

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