Online payment of electricity bills is the cost you pay for the electricity you consume every month. The electricity meter at your place records your consumption in units or kWh and you are billed as per tariff rate at a per-kWh rate. for example. If you keep a 100 Watts bulb switched on for 10 hours, you end up consuming 1 kWh of electricity. Similarly, you can do a rough estimation of the electricity consumed by other appliances in your premises based on their wattage rating. The total of these units is recorded continuously by your energy meter and your respective Distribution Company (like BSES, KSEB ) collects these readings every month. The readings are then applied to a slab-based tariff structure to come up with your monthly electricity charges.