A tariff is a levy or cost that is imposed by the electricity distributor (Energex, Ergon Energy) for the use of electricity. The actual cost of the electricity is made up of the number of kilowatt/hours that you use multiplied by the tariff, for example, if you use 100 kilowatt/hours of electricity and it costs you $0.20c per kilowatt/hour then your electricity account will be $20.