In my case I seem to carry a reasonable credit from summer to winter. I would prefer actual billing
Best answer by Angelabikerbabe
PP do charge on actual usage, you have to submit readings every month.
it depends when you submit your readings. For example, If you submit them 2 days before your payment date, PP will estimate the usage for the last 3 days, but use your readings for the rest of the month.
When PP request my readings , I don't send my readings until the last day possible. Ie PP say they need them by 1st, I send mine 31st. And mine are not being estimated.
also, DDs get revviewed twice a year, so if your using more or less, your DD will be adjusted accordingly.