A time-of-use tariff charges different electricity rates during peak, shoulder and off-peak periods, with the exact times and prices set by your retailer and plan. In Wollongong, your available tariff can also depend on your local network, meter type and whether you have solar or a controlled-load service. It may suit households that can run appliances in cheaper periods, but a single-rate plan could be better if most of your usage is at peak times. Check your bill or ask retailers for an annual cost estimate based on your usage before switching.