A time of use tariff charges different electricity rates at different times, usually with higher peak prices and cheaper off-peak or shoulder periods. The exact times and rates vary between retailers, networks and states, and you generally need a compatible smart meter. It may suit households that can shift usage, such as laundry, dishwashers or electric-vehicle charging, to cheaper periods, but it could cost more if most electricity is used during peak times. Compare the tariff with your current plan and check the likely impact with your retailer or an official comparison service.