An electricity bill usually shows your usage in kilowatt-hours (kWh), the daily supply charge, your tariff rates, GST and any discounts or credits. Usage charges cover the electricity you consume, while the supply charge applies each day whether or not you use power. Check whether the meter reading is actual or estimated, note the billing period and compare your usage with earlier bills. If something looks wrong, contact your retailer first; you can also use the Australian Energy Regulator’s information at energy.gov.au to learn about bills, tariffs and available support.