☀︎SunTariff

Average electricity bill in Western Australia — 2026–27

Derived estimate · AER benchmark × WA Government Standard Electricity Prices 2026–27 (Synergy Home Plan A1)

$2,098/year typical household

≈ $525 a quarter, at the Western Power (SWIS) rate of 33.3c/kWh + 119.2c/day supply.

Benchmark basis: WA (outside the NEM — excluded from the AER benchmarks)

Derived typical bill, WA (2026–27)
HouseholdTypical usageAnnual billPer quarter
At a stated usage level5,000 kWh$2,098$525
How to read this: these are derived estimates — the AER's published benchmark usage priced at the 2026–27 reference rate for Western Power (SWIS) — not a survey of actual bills. WA is excluded from the AER benchmarks, and no live official WA average-usage figure could be verified (Synergy's old average-bill article has been removed). The figure shown is therefore a STATED illustrative usage level of 5,000 kWh/yr (≈13.7 kWh/day), not a measured average — the A1 tariff applied to it is exact.

Electricity bill estimator

Western Power (SWIS)

A 2-person household uses roughly 4,000–5,500 kWh a year.

$2,098 per year ≈ $525/quarter
Supply charge (119.2c/day × 365)
$435.23
Usage (33.3c/kWh × 5,000 kWh)
$1,663.10

Rates: WA Government Standard Electricity Prices 2026–27 (Synergy Home Plan A1), effective 1 July 2026 (GST inclusive). This is the government reference/standing rate for Perth & the south-west interconnected system — market offers can sit below it. Full Western Power (SWIS) price breakdown →

Frequently asked questions

How is the average WA bill worked out?
It's a derived estimate, not a survey: the AER's residential consumption benchmark for WA (outside the NEM — excluded from the AER benchmarks) gives typical annual kWh by household size, and we run that usage through the WA Government Standard Electricity Prices 2026–27 (Synergy Home Plan A1) rates for the Western Power (SWIS) network (supply × 365 + usage × kWh). The methodology page shows the full working.
Why does my bill differ from these figures?
Three reasons: your usage differs from the benchmark, your retailer's market offer prices below (or above) the reference rate used here, and your distribution zone may differ — check your zone's exact rates.
Do bigger households always pay more?
Per household yes, per person no — the benchmark kWh rises with each extra person but far less than proportionally, because heating, cooling and the fridge are shared. That's visible in the table above.

Related

Sources — figures current as at 17 July 2026.

Benchmark edition: AER 'Electricity and gas consumption benchmarks for residential customers 2020' (Frontier Economics, 9 Dec 2020) — the final edition: the AEMC removed the update obligation on 17 Aug 2023; no newer refresh exists. Licence: CC BY 3.0 AU. Rates effective 1 July 2026.