How the Cheaper Home Batteries rebate works
The federal Cheaper Home Batteries Program (CHBP) reduces the upfront price of eligible home batteries through the Small-scale Renewable Energy Scheme — the same mechanism used to subsidise rooftop solar panels since 2011. Your installer generates Small-scale Technology Certificates (STCs) based on your battery's usable capacity, sells them on the certificate market, and passes the proceeds to you as a discount on your invoice. You don't apply separately or wait for a cheque — the discount appears directly on the quote.
From 1 May 2026, the rebate uses a tiered STC factor: the first 14 kWh of usable capacity earns 6.8 STCs/kWh (full rate). Capacity from 14–28 kWh earns 4.08 STCs/kWh (60% of full rate). Capacity from 28–50 kWh earns 1.02 STCs/kWh (15% of full rate). Nothing above 50 kWh usable is subsidised.
At a gross STC spot price of approximately $40 and a typical 7.5% installer admin fee, the net value is approximately $37 per STC — giving a rebate of roughly $252/kWh for the first 14 kWh of usable capacity, and tapering sharply for larger systems. The calculator above shows the exact breakdown for any battery size.
Why the rebate tapers — and what it means for sizing
The tapering is intentional: the government subsidises the first 14 kWh at full rate because that covers the typical household's overnight storage need. For most homes with 6.6 kW of rooftop solar, a 10–14 kWh battery can capture the bulk of their daily solar surplus and supply most of their after-dark usage. The government is essentially saying: if you need more than 14 kWh, you're buying beyond typical residential need and you should fund that yourself.
The practical implication: the rebate-per-dollar-of-battery is highest for systems sized at or below 14 kWh. A 13.5 kWh battery captures nearly the full tier-1 rate. A 20 kWh system has 6 kWh in tier 2 at only 60%, reducing the average $/kWh rebate. A 30 kWh system has 14 kWh at full rate, 14 kWh at 60%, and 2 kWh at 15%. The calculator shows this tier split in real time as you change the capacity.
Stackable state incentives (July 2026)
Three states and territories currently offer incentives that stack on top of the federal CHBP rebate:
| State | Scheme | Amount | Type |
|---|
| NSW | Home Energy Saver targeted discount | Up to $4,000 | Cash grant (income-tested) |
| NSW | Home Energy Saver interest-free loan | Up to $15,000 | 0% loan (income-tested) |
| WA | Synergy Home Battery Scheme | ~$1,300 | Cash grant (Synergy customers) |
| WA | WA interest-free battery loan | Up to $10,000 | 0% loan (income-tested) |
| ACT | Sustainable Household Scheme | Up to $20,000 | 3% loan (from July 2026) |
| VIC / QLD / SA / TAS / NT | Federal CHBP only — no active state scheme as at July 2026 |
State scheme availability and eligibility criteria change frequently. Verify current status with the relevant state energy authority before purchasing. Sources: NSW DCCEEW, Synergy WA, ACT Government / ActewAGL.
Frequently asked questions
How is the Cheaper Home Batteries rebate calculated?
The Cheaper Home Batteries Program (CHBP) applies a point-of-sale discount through the Small-scale Renewable Energy Scheme (SRES). Your installer assigns a set number of Small-scale Technology Certificates (STCs) to your battery based on its usable capacity. From 1 May 2026, the STC factor is 6.8 STCs per usable kWh — but that rate is tapered: you earn the full 6.8 STCs/kWh for the first 14 kWh, 60% (4.08 STCs/kWh) for capacity from 14–28 kWh, and 15% (1.02 STCs/kWh) for capacity from 28–50 kWh. No STCs are issued above 50 kWh usable. The STCs are then sold at the current market price (roughly $40/STC in July 2026), minus an admin fee kept by the installer or trading agent, and the net proceeds are applied as a discount on your invoice.
Why does the rebate taper off for larger batteries?
The tapering is deliberately designed to make the program cost-effective for government while still incentivising most residential installations. Households rarely need more than 14–20 kWh of usable storage to cover their overnight demand from daytime solar surplus. For larger batteries (14–50 kWh), the government believes the reduced rebate is sufficient to bring forward economically marginal purchases without over-subsidising oversized systems that households may not need. Batteries above 50 kWh usable receive no federal subsidy — those are considered commercial-scale installations.
When does the rebate step down and by how much?
The STC factor (currently 6.8 STCs per usable kWh) decreases on a schedule tied to the Small-scale Renewable Energy Scheme — historically stepping down each January and July, though DCCEEW can adjust the timing. The step-down reflects falling battery purchase prices over time, so the effective $/kWh rebate should reduce as batteries get cheaper. Always confirm the current STC factor and market spot price with your installer at the time of purchase, not months in advance. The tier percentages (100%/60%/15%) are set by regulation and are not expected to change until the next formal program review.
Can I stack a state rebate on top of the federal CHBP rebate?
Yes, in three states or territories as at July 2026. NSW offers the Home Energy Saver, which provides a cash discount of up to $4,000 (income-tested) and an interest-free loan of up to $15,000 — both stackable with the CHBP. Western Australia's Synergy Home Battery Scheme provides a grant of ~$1,300 for Synergy customers (or up to $3,800 for Horizon Power customers), stackable with CHBP. The ACT's Sustainable Household Scheme offers a low-interest loan (3% p.a.) of up to $20,000 from July 2026, also stackable. Victoria, Queensland, South Australia, Tasmania, and the Northern Territory currently have no active state battery incentive schemes — households in those states access the federal CHBP only.
What is the STC spot price and why does it affect my rebate?
STCs are tradeable certificates that have a market price set by supply and demand on the registry operated by the Clean Energy Regulator (CER). The government sets a cap price of $40/STC, which is the maximum an STC can fetch in the registry. In practice, STCs for batteries typically trade close to — but slightly below — the cap, and your installer or their STC trading agent will deduct an admin fee (typically 7–12%) before passing on the net proceeds as your discount. As at July 2026, the effective net price per STC is approximately $37. If the market price falls or rises, your rebate changes proportionally. The calculator allows you to adjust the STC price and admin fee if your installer quotes a different effective price.
Does the battery need to meet any requirements to qualify?
Yes. To qualify for the CHBP rebate, the battery must be on the DCCEEW's list of eligible battery systems (the Clean Energy Council approved product list). It must be installed by an accredited installer. It must be a new (not second-hand) battery. Grid-connected systems only — off-grid batteries are not eligible. The battery must have a minimum usable capacity of 2 kWh to qualify. Most major brands (Tesla Powerwall, BYD, Sungrow, Enphase, Alpha-ESS, etc.) appear on the eligible list, but always confirm with your installer that the specific model you're purchasing is approved.
How does the rebate appear on my invoice?
In most cases, the CHBP discount is applied at the point of sale — meaning your installer deducts it directly from the invoice price you pay. You see it as a line item on the quote and pay the reduced amount. Your installer (or their STC trading agent) handles creating the STCs and claiming the rebate from the government on your behalf. You do not need to apply for the rebate separately, receive a cheque, or wait for a reimbursement. A small number of installers operate on a 'rebate later' model where you pay full price and receive the rebate after installation — confirm with your installer which model they use.
Federal rebate estimates are based on the Cheaper Home Batteries Program (DCCEEW) tiers current as at July 2026. STC factor: 6.8 STCs/kWh for the first 14 kWh usable (100%), 4.08/kWh for 14–28 kWh (60%), 1.02/kWh for 28–50 kWh (15%), nothing above 50 kWh. The STC factor steps down on a schedule (January and July) and the STC spot price fluctuates. State incentive amounts and eligibility criteria change frequently. This calculator does not constitute financial, energy, or legal advice. Always confirm your rebate amount with your installer and verify state scheme eligibility with the relevant government body before making any purchase decision.