Off-peak electricity costs vary by state, distributor, retailer and tariff, so there is no single Australian rate. It is usually charged through a time-of-use tariff or a controlled-load tariff for appliances such as electric hot-water systems, with cheaper periods commonly overnight but sometimes at other times. Check your latest bill or electricity plan’s fact sheet for the off-peak cents-per-kilowatt-hour rate, applicable hours and daily supply charge. Your retailer can confirm which tariff is available at your address and whether switching would reduce your overall bill.