When you move house, we use the Estimated Annual Consumption and Annual Quantity to calculate your Personal Projection along with your chosen rates of the tariff you chose.
All meter readings are fed into a central database and used to create a history of your energy usage. When you move house, we use this information to estimate your electricity usage for a year (Estimated Annual Consumption or EAC) and your gas (Annual Quantity or AQ). We'll take these calculations, and the rates of your chosen tariff, to work out your Personal Projection.
For electricity the EAC is updated regularly using recent meter readings, and the AQ for gas it's updated once a year during the industry’s annual review.