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A demand controller reduces the demand charge by

  • A.correcting the power factor of the whole of the incoming supply
  • B.switching the supply to a lower voltage tariff
  • C.shedding non-essential loads as the predicted demand approaches the limit
  • D.reducing the total energy the site consumes

Answer: C

It watches the accumulating demand within the current block and sheds a chiller or a heater for a few minutes to keep the block average below the target. The energy is usually consumed later rather than saved, so the saving is on the demand charge alone.

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