Your power bill generally combines electricity usage, charged in kilowatt-hours (kWh), with a daily supply charge for connecting your property to the network. The usage rate depends on your plan and tariff, such as a single rate, time-of-use pricing or controlled load, and GST is usually included. The bill may be based on an actual meter reading or an estimate, with adjustments made when an actual reading becomes available. Check the billing period, meter readings, rates, discounts and any concessions, and contact your retailer if something looks incorrect or you need help understanding the charges.