Estimate a 90-day electricity bill range from your usage, the usage rate range for your tariff type and the daily supply charge.
This estimator turns the two main parts of an electricity bill into a quarterly range: usage (kWh × rate) plus supply charges (daily charge × number of days).
Formula. Lower estimate = kWh × lower rate + supply charges. Higher estimate = kWh × higher rate + supply charges. All figures are treated as GST-inclusive, so enter rates as they appear on your bill or plan's Basic Plan Information Document.
What to enter. Take the kWh from the usage section of your last bill (or the sum of the peak, shoulder and off-peak lines). For supply charges, multiply the daily supply charge by the days in the billing period; for example 110 c a day × 90 days = $99. The tariff options load illustrative rate ranges; overwrite them with the actual rates from your plan for a precise figure, entering the same rate twice if you know it exactly.
Worked example (illustrative). 1,000 kWh in a quarter on a flat rate of 28–36 c/kWh with $99 of supply charges: 1,000 × $0.28 + $99 = $379; 1,000 × $0.36 + $99 = $459.
Limits. The tool does not apply solar feed-in credits, demand charges, concessions, conditional discounts or one-off fees. Subtract feed-in credits yourself (exported kWh × feed-in rate). See the bill reading worked example for a full line-by-line calculation. Rate ranges shown are illustrative, not current market prices.
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