Australia’s home battery rebate changed in 2026. Here’s what the new size tiers actually mean.

What changed on 1 May 2026?

Australia’s Cheaper Home Batteries Program still uses small-scale technology certificates, or STCs, to reduce the upfront cost of an eligible battery. The important change is that the same support no longer applies evenly across every kilowatt-hour in a larger system.

For eligible installations from 1 May to 31 December 2026, the base STC factor is 6.8. The full factor applies only to the first 14 kWh of usable battery capacity. Capacity above 14 kWh receives progressively less support.

• 0–14 kWh usable: 100% of the applicable STC factor
• Above 14–28 kWh usable: 60% of the applicable factor
• Above 28–50 kWh usable: 15% of the applicable factor
• Above 50 kWh usable: no battery STCs

The rebate is not a fixed cash amount

The program is often described as a rebate of around 30%, but there is no universal cheque for a fixed dollar amount. The number of STCs depends on eligible usable capacity, the factor in force when the battery is installed, and the new capacity tiers. The dollar benefit also depends on the STC market value and the retailer or installer’s treatment of those certificates.

That is why two quotes for the same battery can show different discount lines. Ask each installer to state the eligible usable capacity, the STC quantity, the assumed STC price and whether the discount has already been deducted from the advertised total.

Who is eligible in 2026?

The 1 May changes adjusted the discount calculation rather than rewriting the core eligibility rules. The federal program continues to support eligible batteries connected to new or existing rooftop solar at residential and non-residential premises.

• The battery system must have 5–100 kWh of nominal capacity.
• STCs are available for no more than the first 50 kWh of usable capacity.
• The battery must be on the Clean Energy Council approved product list.
• Installation must be completed by a Solar Accreditation Australia accredited installer.
• On-grid, off-grid and stacked battery systems can be eligible when the program rules are met.

Should you stay at or below 14 kWh?

Not automatically. Fourteen kilowatt-hours is now an important rebate threshold, not a universal recommendation. A household with modest overnight use may need less. A larger all-electric home, a three-phase system, frequent outages, high evening tariffs or a desire for backup headroom may justify more.

Start with the energy you realistically need to shift from daytime solar into the evening, then separately decide how much backup reserve matters. Paying for unused capacity can extend the payback period even when the battery receives a discount.

• Review at least several weeks of interval data rather than one unusually high bill.
• Separate daily bill-saving capacity from emergency backup capacity.
• Check the battery’s usable capacity, not just the larger nominal number.
• Confirm continuous and surge power as well as storage capacity.
• Allow for efficiency losses and any backup reserve you plan to keep unused.

Does waiting change the discount?

Yes. The published factor is scheduled to decline every six months. It is 6.8 for May–December 2026, then 5.7 for January–June 2027 and 5.2 for July–December 2027. The installation date determines the factor, so a battery quoted in December but installed in January can receive a different number of certificates.

That does not mean rushing into the wrong system is financially sensible. Hardware prices, installer demand, state incentives, electricity tariffs and finance costs can all move in the opposite direction. Compare the complete installed price and expected household value, not only the certificate line.

A six-question quote checklist

Ask every installer the same questions so the totals are comparable. A transparent quote should make the hardware, installation scope, rebate assumption and ongoing limitations visible before you sign.

• What are the exact battery and inverter model numbers?
• What are the nominal capacity, usable capacity and continuous output?
• How many STCs are assumed, at what value, and is that already deducted?
• Which circuits will work during an outage, and is backup included in this price?
• Are switchboard work, metering changes, monitoring hardware and commissioning included?
• Who provides the product warranty and who returns if the system stops communicating?