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Adelaide has the highest electricity prices of any Australian capital city. The average SA household pays $2,100+/year. But switching from the default offer to the cheapest market plan can save $350-500 — the biggest absolute savings in the country.
Single-rate tariff, SA Power Networks distribution zone. 4,800 kWh/year. Rates include GST.
Rates from Energy Made Easy June 2026. SA prices are structurally higher due to grid reliance on gas generation, limited interconnection, and the closure of the Northern Power Station (coal) in 2016.
Adelaide's high prices come from three structural factors. Gas dependence: after Northern Power Station closed, SA relies on gas peakers for firming, especially during evening peaks. Gas prices spiked after the Ukraine war and never fully recovered. Grid isolation: the Heywood interconnector to Victoria has limited capacity (650MW) and during summer heatwaves when both states are under strain, SA is an island. Peak demand pricing: SA has the most volatile wholesale prices in the NEM, with summer peaks regularly hitting the $15,500/MWh market cap. These costs flow to retail rates. The silver lining: SA also has the highest solar uptake in Australia (40%+ of homes) and the best feed-in tariffs — up to 14c/kWh from some retailers.
With retail rates above 35c/kWh, every kilowatt-hour you generate yourself is worth more in Adelaide than anywhere else in Australia. A 6.6kW system generates about 9,000 kWh/year worth roughly $3,150 at avoided retail rates. With some retailers offering 14c/kWh feed-in tariffs, even exports provide solid returns. The Distributed Energy Resource program (Smarter Homes) also offers battery rebates of up to $3,000. An Adelaide household with solar and a battery can realistically cut their annual bill from $2,100 to under $500. Payback on a solar-only system in SA is about 3-4 years — the fastest in Australia.