Discussion
Frequency regulation asks of a store a response measured in
Answer: A
Correct answer: seconds
Frequency regulation corrects the second-by-second imbalance between generation and demand, so the store must respond within a second or two and sustain the output for seconds to a few minutes. Speed matters far more than capacity, which is why flywheels, supercapacitors and lithium ion batteries are used for it and pumped hydro, with its minutes-long start, historically was not.
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