How your electricity bill is calculated
Most Indian electricity boards use telescopic slab tariffs: the first block of units is charged at a low rate, the next block at a higher rate, and so on. Only the units within each slab are charged at that slab's rate.
Your bill = energy charges (units × slab rates) + fixed charges + electricity duty and other taxes or surcharges.
Important
Tariffs are different in every state and change every year. The default slabs here are only an example — copy the rates from your latest bill or your DISCOM's tariff order for an accurate estimate. Some states also give free units or subsidies, which you can model by setting a slab's rate to 0.
1 unit = 1 kWh
One unit of electricity is 1 kilowatt-hour: a 1,000-watt appliance running for one hour, or a 100-watt appliance running for ten hours.