Off-peak electricity is charged at a lower rate during set times, often overnight, when demand is lower. The hours and prices vary by state, electricity distributor, retailer and tariff, so check your energy plan or ask your retailer rather than assuming it applies at night. It is commonly used for electric hot-water systems and other controlled-load appliances, which may require separate wiring or a compatible meter. Compare the off-peak rate, daily supply charge and peak rates, and consider your usage pattern before switching; your retailer or a licensed electrician can explain whether the tariff suits your home.