Is there one Australian state with the best solar return?
Not reliably. A national ranking based only on sunshine overlooks local electricity tariffs, solar export limits, equipment and installation costs, shading, state incentives, and when each household uses power. Two homes in the same postcode may have very different results. This guide does not claim a definitive state-by-state ranking without a consistent, current dataset.
The biggest drivers of solar payback
- Electricity you use yourself: every kilowatt-hour of solar generation consumed at home can avoid a purchase from your electricity retailer.
- Electricity you export: eligible exported power may earn a feed-in tariff, usually lower than the retail price of electricity.
- Roof conditions: orientation, tilt, shading and usable area determine the likely output.
- System cost: installation complexity, hardware, electrical upgrades and the applicable federal STC discount affect the amount you pay.
- Network and retailer rules: export limits, time-of-use prices, demand charges and feed-in structures all affect savings.
How returns differ around Australia
NSW and the ACT: compare the household tariff, export rules and the timing of heating, cooling and electric-vehicle charging. Victoria: check whether household-specific state assistance is available, as well as federal incentives. Queensland: sunshine can help output, but midday exports and daytime household use still strongly affect returns. South Australia: compare battery and time-of-use tariff scenarios rather than relying on panel generation alone. Western Australia: retailer and electricity-network rules can materially affect export income and battery economics. Tasmania and the Northern Territory: model local solar yield, prices and installed cost instead of assuming they match eastern-state examples.
These are factors to check, not audited state rankings or promises about savings. Use your address and actual electricity bill for a useful comparison.
Solar panels versus solar panels plus battery: which pays back faster?
Rooftop solar without a battery often has a shorter simple payback period because batteries add substantial upfront cost. A battery can increase solar self-consumption, shift electricity use out of expensive peak periods, and potentially provide backup power when properly configured. It can also participate in some virtual power plant arrangements. However, the additional battery savings may not recover the additional battery cost within the battery’s useful life.
Illustrative calculation: how to compare the two
Solar-only example (illustrative, not an Australian average): if the net installed price is A$7,000 and estimated first-year bill savings are A$1,600, simple payback is A$7,000 ÷ A$1,600 = about 4.4 years. Solar-plus-battery example: if the net installed price is A$15,000 and first-year combined savings are A$2,100, simple payback is about 7.1 years. This is not the battery’s incremental payback.
Incremental battery payback in this example: additional net cost A$8,000 ÷ additional estimated annual savings A$500 = 16 years. This highlights why comparing whole-system paybacks alone can be misleading. Illustrations exclude maintenance, degradation, financing, price changes, replacement and the time value of money. The figures are examples for explaining the calculation, not supplier quotations or predictions.
Will Australia’s battery subsidy improve the return?
The federal Cheaper Home Batteries Program can reduce the upfront price of eligible battery installations connected to new or existing solar systems. Program conditions, discount factors and eligibility change over time. Notably, changes from 1 May 2026 affect the calculation of battery STC entitlements. Request a quotation that separately identifies the battery price, eligible STC discount, additional electrical or backup work and final amount payable. Do not assume every battery is eligible or that the same rebate applies to every capacity.
What about feed-in tariffs and virtual power plants?
Solar exports may earn bill credits under your retailer’s plan; tariff rates and structures vary. A battery may be able to store surplus daytime generation for higher-priced evening usage. A virtual power plant (VPP) may provide additional payments or tariffs, but the operator may control when the battery charges or discharges. Check contractual terms, possible wear, warranty conditions and whether participation affects blackout reserve settings.
What information do you need for a realistic return estimate?
- Your address and roof layout, including shade and usable area.
- Your electricity bill and current retail tariff, including time-of-use rates where relevant.
- Annual and seasonal household electricity use, and the times when it occurs.
- Quoted solar-only and solar-plus-battery installed prices, after applicable incentives.
- Expected annual solar generation, self-consumption, exports and battery cycling.
- Battery usable capacity, efficiency, warranty, degradation assumptions, and potential maintenance or replacement.
Five questions to ask before buying
- What is the projected solar-only payback using my tariff and actual consumption?
- What additional annual savings does the battery produce compared with solar alone?
- What is the incremental battery cost after incentives and its separate payback period?
- What happens to the estimate if export tariffs fall, usage shifts, or electricity prices change?
- Does this battery include genuinely configured blackout backup, or would that cost extra?
Frequently asked questions
Is solar worthwhile outside the sunniest Australian states?
It can be. Returns depend on solar output alongside your retail electricity tariff, self-consumption and net installed cost. A sunnier location does not guarantee a shorter payback.
Is a battery always the best financial upgrade?
No. Batteries may help households with high evening demand or favourable time-of-use pricing, but additional savings may not justify the additional cost for every home.
Can solar and battery rebates be combined?
Sometimes, subject to each program’s eligibility and interaction rules. Check current federal and state requirements before assuming rebates can be stacked.
Do solar panels work during a blackout?
Standard grid-connected solar systems generally shut down when the grid fails. Blackout capability requires compatible hardware and correctly configured backup equipment. Read our Australian blackout and battery backup guide.
What is a good solar payback period?
There is no universal threshold. Compare the projected payback with system lifetime, warranties, opportunity cost, financing expenses and how long you expect to remain in the home.
See what solar could save at your address
Your roof, usage pattern and energy tariff are unique. Start with your roof’s solar potential, then compare installer quotations using consistent assumptions.
Already comparing installations? Read our Australian solar installer checklist or solar rebates guide.
Keep reading
Sources and further reading
- Australian Government — How solar pays for itself and batteries reduce bills
- Australian Government — Electricity pricing plans and tariffs
- Australian Government — Government rebates and loans
- Clean Energy Regulator — Calculate STC entitlements
- Australian Government — Home batteries
- Australian Government — Solar for households
Important: All calculations above are illustrations, not forecasts or financial advice. EnergyBrain roof estimates are modelled and not installation quotes, rebate approvals or guaranteed returns. Confirm current costs, incentives, tariffs and equipment eligibility with official sources and accredited installers.