Is a home battery worth it in Australia right now?
The short answer depends on three numbers: your import/feed-in spread, your daily solar surplus, and your net cost after rebates. The 2026 federal rebate (the Cheaper Home Batteries Program) has meaningfully reduced upfront costs — a 13.5 kWh battery that cost $18,000 installed a couple of years ago now costs closer to $10,000–$11,000 after the discount. But that alone doesn't make every battery a good investment.
The single biggest factor is whether you're on a time-of-use tariff. On a flat tariff of 32¢/kWh with a 6¢ feed-in tariff, your savings spread is 26¢/kWh — good but not great. On a ToU tariff where peak imports cost 45¢/kWh, the spread blows out to 39¢/kWh, improving annual savings by 50% and cutting payback by several years.
The second factor is daily solar surplus. A battery sitting half-empty each day because there's not enough rooftop solar to fill it is an expensive way to store a small amount of energy. Model your actual average surplus — not your best summer days.
The savings maths: why the spread matters, not the full import rate
A common mistake when evaluating batteries is comparing the cost against the full retail electricity rate. If grid power costs 32¢/kWh, it's tempting to value every stored kWh at 32¢. But that's wrong.
Without a battery, your daytime solar surplus goes to the grid and earns the feed-in tariff — say, 6¢/kWh. With a battery, you store that surplus instead, and use it at night. You save 32¢ of imports, but you also forfeit 6¢ of feed-in revenue. The net saving is 32¢ − 6¢ = 26¢/kWh — the spread.
This is what the calculator models: your net saving per kWh is the avoided import rate minus the foregone feed-in tariff. On time-of-use tariffs, the avoided rate is the peak rate (often 40–55¢/kWh), not the flat rate, which is why ToU tariffs dramatically improve battery economics.
The 2026 federal battery rebate explained
The Cheaper Home Batteries Program (CHBP) applies a point-of-sale discount to eligible home battery installations. Your installer creates Small-scale Technology Certificates (STCs) on your behalf, which are sold and the proceeds applied to reduce your invoice. You don't need to apply separately — the installer handles it.
From 1 May 2026, the rebate follows a tiered structure designed to discourage oversizing:
| Battery usable capacity | Approx. rebate rate | Example |
|---|
| First 14 kWh (100%) | ~$252/kWh | 10 kWh → ~$2,520 |
| 14–28 kWh (60%) | ~$151/kWh | 13.5 kWh → ~$3,402 |
| 28–50 kWh (15%) | ~$38/kWh | Sharply reduced |
| Above 50 kWh | $0 | No STCs issued |
Rates as at July 2026. The rebate decreases every 6 months to reflect falling battery prices. Always confirm the current rate with your installer at the time of purchase.
Frequently asked questions
How does the federal battery rebate work in 2026?
The Cheaper Home Batteries Program (CHBP) is the federal government's scheme to reduce the upfront cost of home batteries. It works through the small-scale renewable energy scheme (SRES) — your installer creates Small-scale Technology Certificates (STCs) on your behalf and applies the discount directly to your invoice. The program issues 6.8 STCs per usable kWh of battery capacity; at approximately $37 per STC after admin costs, this works out to roughly $252 per kWh. From 1 May 2026, the discount follows a tiered structure: full rate (~$252/kWh) for the first 14 kWh of usable capacity, 60% (~$151/kWh) for 14–28 kWh, 15% (~$38/kWh) for 28–50 kWh, and nothing above 50 kWh. For a 13.5 kWh battery, the estimated federal discount is approximately $3,402 as at July 2026. The $/kWh figure steps down each January and July as battery prices fall — always confirm the exact amount with your installer at time of purchase.
What is the savings 'spread' and why does the calculator use it?
The spread is the difference between what you pay to import electricity from the grid and what you earn by exporting solar surplus as a feed-in tariff (FiT). If your import rate is 32¢/kWh and your FiT is 6¢/kWh, the spread is 26¢/kWh. Without a battery, your daytime solar surplus goes to the grid at 6¢. With a battery, you store it and use it at night, saving 32¢ of grid import instead — a net benefit of 26¢ per kWh stored. The common mistake is calculating savings against the full 32¢ import rate, ignoring that you were already getting 6¢ for the solar. The actual saving is always the spread, not the full import rate. On time-of-use tariffs, the spread is the peak rate minus the FiT, which can exceed 40¢/kWh — making batteries considerably more attractive.
Are home batteries worth it on a flat electricity tariff in 2026?
On a flat tariff, whether a battery is worth it depends primarily on the spread between your flat import rate and your feed-in tariff. With a typical flat rate of 28–32¢/kWh and a FiT of 5–8¢/kWh, the spread is roughly 20–27¢/kWh. At 5 kWh cycled per day, that generates around $350–$490 per year in savings. With a net cost of $10,000–$13,000 after rebates, payback on a flat tariff is typically 20–35 years — exceeding most battery warranties. Flat-rate tariffs rarely make batteries economically viable at current prices. The exception is if your flat rate is unusually high (40¢+) or if you're adding a VPP contract on top of the savings.
Do home batteries pay off better on time-of-use tariffs?
Yes, significantly. Time-of-use (ToU) tariffs charge higher rates during peak hours (typically 4–9 pm) — often 40–55¢/kWh in capital cities — and lower rates off-peak. A battery that charges from daytime solar and discharges during peak hours avoids those peak imports. If the peak rate is 45¢/kWh and the FiT is 6¢/kWh, the spread is 39¢/kWh — roughly 50% better than a typical flat-rate spread. This can halve the payback period compared to flat-rate tariffs, often bringing it below 10 years after the federal rebate. If you're considering a battery, switching to a ToU tariff at the same time is strongly recommended.
What is a Virtual Power Plant (VPP) and how does it affect payback?
A Virtual Power Plant is a network of home batteries that an energy retailer aggregates to trade electricity in the wholesale market. In exchange for allowing the retailer to discharge your battery at peak grid demand, you typically receive an annual payment ($150–$600/yr depending on the program) plus preferential energy rates. VPP income is additive to your self-consumption savings, directly reducing payback period. Several Australian retailers offer VPP programs including Origin, AGL, and Simply Energy. Not all batteries and inverters are compatible — check with your installer. If a VPP is available to you, include it in the calculator's VPP incentive field.
How does battery degradation affect my long-term savings?
All lithium-ion batteries degrade over time — they lose a small percentage of usable capacity each year as the cells age through charge/discharge cycles. Most manufacturers specify around 1.5–3% annual capacity loss for home batteries. At 2% per year, a 13.5 kWh battery has effectively 11.1 kWh usable capacity by Year 10, producing about 18% fewer savings in Year 10 than Year 1. The calculator applies this compound degradation annually when projecting the 10-year net position, which is why total savings over the warranty period are less than Year 1 savings multiplied by 10. Many battery warranties guarantee that the battery retains at least 70–80% capacity by Year 10.
Can I stack the federal rebate with state incentives?
Yes. The Cheaper Home Batteries federal rebate (CHBP) can be combined with eligible state programs. As at July 2026, NSW offers the Home Energy Saver — an interest-free loan up to $15,000 plus an income-tested discount up to $4,000 — on top of the federal rebate. Victoria's Solar Homes battery rebate closed in late 2024 and has not been renewed. Queensland and South Australia no longer have active state battery schemes and households access the federal CHBP only. Always verify current state programs before finalising your purchase, as scheme availability and eligibility criteria change frequently.
How much solar surplus do I need to make a battery worthwhile?
As a rule of thumb, you need enough consistent daily solar surplus to charge the battery reasonably full each day. A 13.5 kWh battery with 5 kWh of daily surplus will only cycle about 4.5 kWh per day after round-trip losses — that's a 33% utilisation rate. If your daily surplus is 8–10 kWh, a 10 kWh battery may deliver better economics than a 13.5 kWh system. Use the calculator to model different capacity/surplus combinations: increase battery capacity until adding more kWh stops meaningfully improving the payback period. Most solar installers recommend at minimum 4–5 kWh of daily average surplus before recommending a battery add-on.
Federal rebate estimates are based on the Cheaper Home Batteries Program (DCCEEW) tiers current as at July 2026. STC prices and rebate tiers change every 6 months. State scheme availability and eligibility criteria change frequently — verify with your state government before purchasing. This calculator does not account for grid charging, battery arbitrage strategies, or network tariff changes. Figures are estimates only. Not financial, energy, or investment advice — consult a licensed energy adviser or financial adviser before making decisions based on this information.