Check your bill for usage in kilowatt-hours (kWh), then compare the same billing period rather than just the dollar amount. Your retailer may show a usage comparison with similar homes, or you can use the Australian Government's energy comparison tools where available. Keep in mind that household size, appliances, heating and cooling, solar panels, weather and tariff type can make comparisons less meaningful. For a clearer picture, compare your kWh across several bills and ask your retailer to explain any unusual change.