Off-peak electricity is power supplied during set lower-demand periods, often overnight, and is commonly used for hot-water systems, heating or other controlled loads. The times and prices vary by state, network, retailer and tariff, so there is no single national off-peak schedule. Check your electricity bill, smart-meter data or retailer plan for the exact periods and whether your appliance is connected to a controlled-load tariff. Your retailer or energy adviser can also explain whether switching tariffs would suit your usage, as off-peak rates may come with different daily charges or conditions.