Start with the billing period, meter reading and total kilowatt-hours used, then compare your usage with earlier bills. Check the supply charge, usage rates, discounts, concessions, GST and any fees, as these can all affect the total. Make sure the tariff and rates match your current energy plan, particularly after a contract or market-offer change. If something looks wrong, contact your retailer and ask for an itemised explanation; you can also use your state or territory’s official comparison service to review other plans.