12. Usage on your bill
This number can be found on your electricity bill and is often referred to as the average daily usage (Use this figure).
If the bill just shows a total amount of energy rather than a daily average, you need to divide this by the number of days in the billing period to get the daily average. In the example bill below we divide 893.52 kWh by 92 days = 9.7 kWh per day. This input affects the assumption on how much solar generation is used onsite versus exported to the grid.
13. Import tariff
This is the rate that you pay for electrical energy from the grid, charged in cents per kWh. The calculator only works with a single number for this input, so if you have been charged different rates for different amounts of energy (e.g. on a time-of-use tariff), please enter a rough average tariff representing what you paid overall.
14. Supply charge
This is an amount you are charged every day, regardless of how much energy you import from the grid.
In the example below the amount is 116.95 c/day, however this retailer granted a special discount of 8.71 c/day, so the effective supply charge is 108.24 c/day. Applying GST (multiply by 1.1) and the 7% pay-on-time discount (multiply by 0.93)1 as above we get 110.7 c/day.
15. Feed-in tariff
This is a rate at which your retailer pays you for energy you export (feed in) to the grid, defined in cents per kWh. The example below uses 12 c/kWh. GST is not payable on this rate.
Page last updated: 22/11/19