Yes, in most cases you can stack. The federal Cheaper Home Batteries Program was built to sit alongside state and retailer incentives, so the STC discount comes off your invoice and a state scheme or VPP payment can add to it. What you cannot do is claim the federal discount twice, or claim a state incentive that has closed or that your property does not qualify for.
The practical answer depends on three questions: which state you are in, whether a scheme is still open, and whether you are willing to join a virtual power plant. This article gives you the framework; the state detail is in battery rebates by state.
The layers
Think of battery support as layers, each paid in a different way.
| Layer | How it is delivered | Who pays |
|---|---|---|
| Federal STC discount | Upfront, off the invoice, via assigned certificates | Market, through the certificate scheme |
| State incentive | Upfront discount, rebate, certificate scheme or loan, depending on state | State government or scheme |
| VPP sign-up payment | Cash, bill credit or ongoing payments | Retailer or VPP operator |
| Bill savings | Lower grid use over the life of the battery | You keep it |
Only the first layer is nationwide. The second depends on where you live and when you buy. The third depends on who you choose to connect with.
A worked stack
Take a 10 kWh battery installed in late 2026. At a factor of 6.8 it creates 68 STCs. At roughly $38 each, the federal discount is about $2,584. If the household also qualifies for a state incentive and a VPP sign-up credit, the net price is the battery price less all three. We do not quote state or VPP dollar figures here because they change and vary by provider; check the scheme’s official page for the current amount.
The federal piece is the one you can calculate yourself. The rest you confirm with the scheme or the retailer. See how the program works for the formula.
What usually stacks
- Federal STC discount with a VPP sign-up payment. Separate mechanisms. The battery has to be VPP-capable for the federal discount anyway.
- Federal STC discount with a state incentive that is still open. In NSW the earlier state battery incentive moved into the federal program in 2025, with a Peak Demand Reduction Scheme incentive for VPP connection. In Western Australia a state residential battery scheme has run alongside the federal one. Confirm the current status.
- Federal STC discount with a retailer offer, such as a bill credit or feed-in tariff bonus.
What does not stack, or has limits
- A second battery at the same property. One per property under the federal program.
- State schemes that have closed. Several earlier battery loans and rebates have wound up as their funding ran out or the federal program took over.
- Schemes with a household income cap or concession test. Check eligibility separately.
- Offers that lock you in. A VPP payment may require a minimum term, and exiting early can cost you.
Common mistakes
- Counting the VPP credit as certain. It depends on the operator and your usage.
- Assuming a state scheme is still open. Funding caps and closures happen with little notice.
- Missing a deadline for a state claim. Some require action within a set window after installation.
- Forgetting tax. Whether an incentive is assessable depends on how it is delivered and on your situation; ask your accountant if it matters to you.
- Double counting. Some quotes show the same discount twice under two names.
What installers should do
If you sell batteries, make the stack legible. List each incentive on the quote, note which are delivered by you and which the customer claims, and keep the STC value conservative. Carrying the federal discount until your trader pays is enough of a cash-flow load without also guessing at state amounts. How battery STCs work covers the numbers.
A checklist for stacking
- State and postcode: which schemes apply?
- Is each scheme open today, and until when?
- Does it need action before installation?
- Who claims it, you or the installer?
- Are there caps by income, concession or network area?
- Does a VPP offer have a lock-in or clawback?
- Is the price on the quote built on confirmed amounts only?
If you can answer all seven, you have a stack you can rely on. If not, the uncertain pieces should come off the price you plan around.
Stacking and cash flow for installers
When a state incentive is applied as a discount on your invoice, you carry two receivables: the federal certificate value and the state amount. Each has a different payer and timing. Settle the federal piece quickly through a trader that pays in a day or two, and put the state piece on a separate calendar so you can see what is overdue. Combining them in one number is the quickest way to lose track.
An example of a clean stack
A household in a state with an open incentive for VPP-connected batteries buys a 10 kWh battery. The quote shows the battery price, then the federal STC discount of 68 certificates at a stated price, then the state amount marked “confirmed by the scheme as at the quote date”, then the customer’s net price. A separate line notes the VPP credit as “paid by the operator after connection, not included in the price”. Nothing is hidden, and the customer knows which pieces they must act on.
Compare that with a quote that offers a single “rebate-inclusive” price with no line items. The two may be the same number today, but only one lets you check it.
What to do next
- Households: list your state, your retailer and the VPPs available to you, and check which schemes are open today.
- Installers: add an incentives block to your quote template and keep it current.
- Read the program overview and the battery STC page.
- If you are deciding whether the VPP piece is worth it, see should you join a VPP, and for the mechanics of federal and state together, battery rebate stacking.