Off-peak electricity is power supplied during set lower-demand times, often overnight, when some retailers offer a cheaper tariff. In Australia, the hours, prices and eligibility vary by state, retailer, meter and tariff; some homes use a separate controlled-load circuit for hot-water systems or other appliances. Off-peak rates are not automatically cheaper overall, because peak rates, daily charges and usage patterns also affect your bill. Check your electricity plan or ask your retailer when off-peak periods apply and whether changing tariffs would suit your household.