Off-peak electricity costs vary by retailer, state, tariff and meter type, so there is no single Australian rate. Cheaper periods may apply overnight or at other times set by your retailer or distributor, while controlled-load tariffs for hot-water systems can have separate rates. Check your electricity bill or online account for the price per kilowatt-hour, daily supply charge and the listed off-peak hours. Your retailer can confirm the applicable rates and whether switching tariffs would suit your usage.