Discussion
Energy storage is needed on an electricity system because generation and demand must be
Answer: A
Correct answer: matched instant by instant
Electricity is not stored in the network itself, so generation must equal demand plus losses at every moment; any imbalance appears at once as a change in system frequency. Traditionally the matching was done by dispatching generators up and down, and storage is the alternative that lets energy be moved in time rather than requiring a plant to follow the load.
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