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Discussion

The duck curve describes the shape of

  • A.the output of a wind farm over a day
  • B.the frequency of the system during a fault
  • C.net demand after solar generation is subtracted
  • D.total demand over a whole year

Answer: C

Correct answer: net demand after solar generation is subtracted

Net demand is what the remaining generators must supply. On a system with much solar it falls steeply through the middle of the day and rises sharply in the evening as the sun sets and domestic demand peaks, giving a curve whose belly and steep neck resemble a duck. The problems it poses are the depth of the midday minimum and the steepness of the evening ramp, both of which storage addresses directly.

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