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A load duration curve differs from a load curve in that it plots demand against

  • A.the day of the year on which it occurs
  • B.the cost of meeting it at the margin
  • C.the time for which that demand is equalled or exceeded
  • D.the hour of the day at which that demand occurs

Answer: C

Sorting the year's hourly demands in descending order shows at a glance how few hours the peak capacity is needed for, which is the argument for peak clipping. The chronological order is lost, so the curve cannot show when the peak occurs.

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