Household electricity usage is measured in kilowatt-hours (kWh) and depends on factors such as home size, weather, insulation, appliances, hot-water systems and how many people live there. Heating, cooling, electric hot water, pool pumps, clothes dryers and older fridges can use significant amounts of power. Check the usage section of your bill or retailer app, then compare daily or monthly kWh across billing periods. A smart meter or plug-in energy monitor may help identify high-use appliances, while your retailer can explain how your usage data is recorded.