A time-of-use tariff charges different electricity rates at peak, shoulder and off-peak times, rather than one flat rate all day. In Sydney, the exact periods and prices depend on your retailer, plan and local distributor, and may differ across Ausgrid, Endeavour Energy and Essential Energy areas. These tariffs can suit households that shift usage, such as hot-water systems, dishwashers or electric-vehicle charging, to cheaper periods, but they may cost more if you use lots of electricity during peak times. Check your bill or smart-meter details, then compare plans through Energy Made Easy before switching.