Pro-rata billing applies when your meter reading covers a
different number of days than the billing cycle.
For example, if the billing cycle is 30 days but your reading was taken after only 20 days, your actual usage for those 20 days is scaled up to estimate 30 days of usage:
Adjusted units = (Actual units ÷ Reading days) × Cycle days
Example: You consumed 40 units in 20 days. The cycle is 30 days.
Adjusted = (40 ÷ 20) × 30 =
60 units billed.
This ensures fair billing when readings don't align exactly with the cycle dates. You'll see a
Pro-Rata label on such bills with the day ratio shown (e.g. "20/30 days").