Supply and demand
1 mark · EasyState one reason why hydroelectric power stations are able to respond quickly to sudden increases in electricity demand.
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Hydroelectric power stations can respond quickly because they can release stored water almost instantly to generate electricity.
Also accept: They can start and stop generating electricity very quickly.; They generate electricity by releasing water which can happen very fast.
Common mistakes: They take a long time to start up.; They use fossil fuels.
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Marking points
B1 · 1 mark · States hydroelectric power can respond quickly because stored water can be released instantly
Worked solution
Hydroelectric power stations can release water stored in reservoirs very quickly to generate electricity when needed.