Start by checking the billing period, meter readings, electricity usage in kWh, daily supply charge and the tariff rate. Compare your usage with earlier bills, allowing for seasonal changes, and check whether the bill is based on an actual or estimated meter reading. Look for discounts, solar feed-in credits, concessions and any late fees, then compare your plan with available offers using your state or territory’s official comparison service. If the bill seems wrong, contact your retailer first and ask for a review; unresolved disputes can usually be taken to your state or territory energy ombudsman.