Energy Charges

Picture a taxi fare that has both a fixed base charge and a separate per kilometre charge on top. Energy charges are the per kilometre portion of a power tariff, the variable payment based specifically on the actual quantity of electricity generated or consumed, distinct from the fixed capacity charge paid regardless of usage.

For a generator, energy charges typically cover variable costs like fuel, since a coal or gas plant's fuel cost rises directly with how much it actually generates, unlike its fixed loan or maintenance costs which stay constant. For a consumer, the energy charge component of a bill is simply the rate multiplied by the actual units of electricity used, which is why cutting consumption directly reduces this part of the bill.

Together, capacity and energy charges form the two building blocks of almost every electricity tariff structure in India, one rewarding availability, the other rewarding actual delivery and actual use.