Fixed rate provides a locked-in rate per kilowatt hour during the contract period. This means that prices remain the same throughout the contract term regardless of SP’s fluctuating tariff.
Discount off tariff provides a fixed percentage discount off the tariff set by SP. The tariff is reviewed every quarter, but you are guaranteed to enjoy maximum savings.
Peak and off-peak charges different rates during different periods, meaning you save more at night, from 11pm – 7am (may vary slightly with different retailer), either at a fixed rate or at a fixed discount off the SP tariff.