In electrical energy which type of tariff is also called as Doherty rate?

Option 4 : Three part tariff

Three-Part Tariff or Doherty Rate:

• The three-part tariff is the most ideal tariff for the consumer
• Three-Part Tariff: When the total charge to be made from the consumer is split into three parts, it is known as a three-part tariff.
• Three parts include fixed charge, semi-fixed charge and running charge
   

Total charge = Rs (a + b × kW + c × kWh)

a = fixed charge made during each billing period which includes interest and depreciation on the cost of secondary distribution and labour cost of collecting revenues

b = charge per kW of maximum demand

c = charge per kWh of energy consumed

• By adding the fixed charge to a two-part tariff, it becomes three-part tariff. This type of tariff is usually applicable to bulk supplies.