Discussion
A utility introduces a night tariff and a new peak appears at the hour it begins. The cause is
Answer: B
Correct answer: loss of diversity as every controlled load switches together
A tariff beginning at a fixed hour causes every timer and every controller to act at that instant, so loads which had been naturally spread now coincide exactly. The remedy is randomisation - staggering the start times across the population - which restores the diversity the tariff destroyed.
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