Your electricity bill cost depends on how much power you use, your tariff and daily supply charge, your state or territory, and any solar feed-in credits or concessions. Seasonal heating and cooling, hot-water systems and older appliances can significantly increase usage. To check whether your plan is competitive, compare its rates and estimated annual cost with offers on the Australian Energy Regulator’s Energy Made Easy website, or your state’s approved comparison service. Your retailer can explain the bill, while eligibility for concessions should be checked with the relevant state government department.