Start by comparing the estimated annual cost for your postcode, rather than focusing only on advertised discounts. Check the usage rates, daily supply charge, tariff type, contract terms, exit fees and whether discounts are conditional on paying on time. Your bill and smart meter data can help you estimate how much electricity or gas you use. In most of Australia, Energy Made Easy provides government comparison information; Victorian households can use Victorian Energy Compare, while the retailer makes the final offer available to you.