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The reason a tariff charges separately for maximum demand as well as for energy is that

  • A.the cost of generating a unit of energy rises with the total consumed
  • B.the plant must be sized for the peak, not for the average
  • C.the energy meter cannot register accurately at times of heavy load
  • D.the power factor of the load is worst at the time of maximum demand

Answer: B

Generators, transformers and cables must be rated for the greatest load a consumer imposes, and that capital cost is incurred whether the consumer uses it for one hour or for a thousand. The demand charge recovers it, while the energy charge recovers the running cost.

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