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To record the maximum demand and energy consumption of the consumer, Hopkinson Demand Rate Method requires:
1. Two meters
2. Three meters
3. No meter
4. Single meter

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Correct Answer - Option 1 : Two meters

Two-Part Tariff (Hopkinson Demand Rate):

  • When the rate of electrical energy is charged on the basis of maximum demand of the consumer and the units consumed, it is called a two-part tariff or Hopkinson Demand Rate.
  • In a two-part tariff, the total charge to be made from the consumer is split into two components that are fixed charges and running charges.
  • The fixed charges depend upon the maximum demand of the consumer while the running charges depend upon the number of units consumed by the consumer.
  • This type of tariff is mostly applicable to industrial consumers who have appreciable maximum demand.
  • Thus, the consumer is charged at a certain amount per kW of maximum demand plus a certain amount per kWh of energy consumed i.e.,
     

Total Charge = Rs (b × kW + c × kWh)

Where b is a charge per kW of Maximum demand and c is charged per kWh of energy consumed

Advantages:

  • It is easily understood by the consumers.
  • It recovers the fixed charges which depend upon the maximum demand of the consumer but are independent of the units consumed.


Disadvantages:

  • The consumer has to pay the fixed charges irrespective of the fact whether he has consumed or not consumed the electrical energy.
  • Two separate meters are required to record the maximum demand and energy consumed.
  • There is always an error in assessing the maximum demand of the consumer.

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