The Commission for Regulation of Utilities (CRU) requires all electricity suppliers to calculate an “Estimated Annual Bill” figure based on their tariff offers. The purpose of this calculation is so that you can easily compare offers from different suppliers.The estimate is based on an average annual consumption, set by the CRU, for a domestic property of 4200 kWh of electricity in a calendar year. It is worth noting that your annual consumption may vary from these figures depending on your usage requirements.Therefore, your annual bill may be higher or lower than the EAB calculation.The formula for the EAB calculation is as follows;Estimated Annual Usage 4200 kWh X Unit Rate + Annual Standing Charge + PSO Levy + Vat at 9%