Our gas budget plan payment scheme (BPP) is offered to all customers with an AQ below 293,000 KWh (above which a monthly meter read is required by the industry).
The budget plan simply divides predicted consumption by 12 to give you a monthly amount. The predicted consumption is called the AQ (Annualised Quotent) and is derived from what the industry (Xoserve) hold for your meter, based on historical consumption.
This is recalculated and updated once a year to reflect variations in consumption patterns. Therefore your monthly Direct Debit amount will be dictated by this calculation.