The rebate makes a battery cheaper. It does not make it right. A good decision starts with whether the battery will do useful work in your house, and only then asks how much the discount helps. The numbers in the payback guide show how wide the range is: under seven years in a high-value home, close to fifteen in a low-value one, on the same rebate.
This page is the decision framework. It gives you five tests, three household types, and a list of things quotes tend to leave out.
What the rebate is
The Cheaper Home Batteries Program, from 1 July 2025, gives STCs for batteries of 5 to 100 kWh usable capacity, with up to 50 kWh eligible. The battery must be CEC-approved and VPP-capable, installed by an accredited installer, one per property, on new or existing solar. At the time of writing the factor is 6.8 to 31 December 2026, then 5.7 from 1 January 2027 and 5.2 from 1 July 2027. The first 14 kWh earn 100 per cent of the factor, 14 to 28 kWh earn 60 per cent and 28 to 50 kWh earn 15 per cent. The program budget has been expanded from $2.3 billion to $7.2 billion, as reported.
On a 10 kWh battery that is 68 STCs now, about $2,584 at $38. Use the battery STC calculator for your size.
Five tests
1. Do you have solar, and is there surplus? A battery stores solar you would otherwise export. With 6 kW or more and a daytime-empty house, there is plenty to store. With no solar, the battery charges from the grid and only works on certain tariffs.
2. Is your evening load big enough to use the battery? If you use 10 kWh or more between dinner and sunrise, a 10 kWh battery will empty every night. If you use 3 kWh, half of it sits idle.
3. How wide is the gap between your import and export rates? Each shifted kilowatt hour saves the difference. A gap of 30 cents is a good case. A gap of 15 cents halves the saving.
4. What does backup mean to you? If an outage is a real risk, such as in a storm-prone or bushfire area, or someone depends on medical equipment, backup has value that does not show up in payback. Note that not all batteries provide backup by default. It is a feature of the installation.
5. Can you stay long enough? Payback near ten years needs ten years of ownership and a battery that lasts. Warranties are commonly around ten years. If you may move soon, check whether the battery adds to the sale price, which is uncertain.
Pass four or five and the battery is probably worth it. Pass two or fewer and it probably is not, regardless of the rebate.
Three households
The high-use family. Solar at 8 kW, evening use of 12 kWh, a 40-cent import rate and a 4-cent feed-in rate. A 10 kWh battery at $10,000 less $2,584 shifts 8 kWh a day. Saving: 7.2 x $0.40 less 8 x $0.04, or $2.56 a day, about $934 a year. Payback about 7.9 years. Worth it, and more so with backup value.
The couple on a low bill. Solar at 5 kW, evening use of 4 kWh, a 28-cent import rate and an 8-cent feed-in rate. A 5 kWh battery at $6,000 less $1,292 shifts 4 kWh. Saving: 3.6 x $0.28 less 4 x $0.08, or $0.69 a day, about $252 a year. Payback about 18.8 years. Not worth it on money alone.
The retiree with no solar. No panels, a time-of-use tariff with a cheap overnight rate. The battery would charge off-peak and discharge at peak. The gain depends entirely on the tariff gap, and would usually be better served by adding solar first. Run the solar numbers in the STC calculator before you price a battery.
The middle case is where most people sit, and there the answer is “it depends”, which is why a number from your own bill beats any general claim.
What a quote tends to leave out
Other omissions to look for. Switchboard or wiring upgrades, which can add hundreds or thousands. Backup circuit costs, if you want backup to some circuits. Monitoring fees, if the app has a subscription. Removal of an existing system, if you are replacing one. Warranty conditions, particularly on cycles. And the VPP requirement: the battery has to be VPP-capable, and joining is optional, but some quotes bundle a VPP plan to make the numbers look better. See whether joining a VPP is worth it.
Timing and the rebate
The rebate falls on a published calendar, which can pull a decision forward. Waiting from December 2026 to January 2027 costs about $418 on a 10 kWh battery, and a further $190 on 1 July 2027. That is worth weighing but is rarely the deciding factor. Our pieces on buying before 2027 and waiting for prices to fall go through it with numbers. The short version is that a good battery bought a few months late beats a poor one bought on time.
State incentives
State support has narrowed. At the time of writing, Queensland’s Battery Booster, the Victorian Solar Battery Loan, the Tasmanian Energy Saver Loan and the Northern Territory battery scheme have closed. Western Australia’s battery scheme is active and requires VPP participation. In NSW, the battery incentive moved into the federal program in 2025, with a PDRS incentive for VPP connection. Check your state’s current position before counting on anything beyond the federal discount. See the answer on stacking battery rebates.
Putting a value on backup
Backup is the benefit that does not fit in a payback table, so people either ignore it or overpay for it. Try to price it honestly. Ask how often you lose power and for how long. If it is two outages a year of a few hours, the practical value is mostly convenience, and a battery that keeps the fridge, lights and internet on is a nice extra. If you lose power for a day at a time, or someone relies on powered medical equipment, backup moves from extra to reason.
Then check what the quote actually provides. Some installations back up the whole home, some only a few circuits through a separate board, and some none at all unless an extra component is fitted. A battery cannot run a ducted air conditioner or an induction cooktop for long. The question to ask the installer is not “does it have backup” but “which circuits stay on, for how long at what load, and what does that cost”. If the answer is vague, assume the backup you imagine is not the backup you are buying.
A note on honesty in selling
Batteries are sold hard in the weeks before a rebate step, and the pressure is the sign to slow down. A good installer will show you the numbers at both dates, tell you if a smaller battery suits you better, and be clear about what is optional. A less careful one will quote a payback without stating assumptions, promise VPP income as if it were fixed, or suggest the largest battery because the certificate count looks impressive. The tiers mean the largest battery is rarely the best value per dollar of discount. If you are unsure, ask for a second opinion from a different installer, and compare the usable kWh and the price per usable kWh on each quote.
Short answers on this topic: battery worth with rebate and much federal battery rebate.
What to do next
- Run the five tests against your own bill and house.
- Calculate the payback with the guide, using three scenarios.
- Get at least three quotes with the five separate lines.
- Check eligibility: CEC-approved, VPP-capable, accredited installer.
- Read the battery STC pillar and the installer guide. If you are an installer, see how battery STC trading works and today’s rate.