The estimate is based on your usage: how much energy you've already used and also the time of year. We use your previous actual meter reads to work out your average daily consumption. Because you use different amounts of electricity at different times of the year, this is adjusted for the time of year the meter reads were taken and also for the time of year the estimate relates to. We then multiply this daily consumption by the number of days in the billing period.

You should submit regular meter reads. The more actual meter readings we have on your account the more accurate both your billing and any future estimates will be as we'll have a better record of your recent usage.