WA is one of the few states that still adds its own battery rebate on top of the federal one. The Residential Battery Scheme adds up to around $1,300 for Synergy customers or $3,800 for Horizon customers, and the allocation is capped and running down.
Your solar panels work hard all day. Then the sun goes down, your house switches to the grid, and you buy back power at the worst price of the day. A battery stores your own cheap daytime power for the evening peak instead.
The catch used to be the upfront cost. The federal Cheaper Home Batteries Program changed that in 2025. It takes thousands off a battery at the point of install, in every WA postcode, with no income test.
Two things make WA different. WA still runs its own Residential Battery Scheme on top of the federal rebate, and there is also a WA interest-free loan up to $10,000 to cover the rest. The state scheme is capped, so it is the part most likely to run out first.
Here is exactly what WA homes can claim in 2026, and how to see your number in 30 seconds.
Solar rebates in WA (2026)
Quick answer: in Western Australia the federal STC rebate takes roughly $1,600 to $2,200 off a 6.6kW solar system in 2026, applied as an upfront discount. WA also has its own Residential Battery Rebate (about $1,300 on the Synergy network, up to $3,800 on Horizon), plus the DEBS feed-in buyback for exported solar. The federal Cheaper Home Batteries rebate stacks on top, about $2,700 off a 10 kWh battery. Calculate your STC rebate below.
Estimate for a 6.6 kW system in STC Zone 3, at a 5-year deeming period (2026). The STC price moves with the market, so your installer applies the exact discount at signing.
Lock in my $1,748 STC rebate →30 secs · Free · No obligation
Check your battery price by size
Pick your home size and the check returns your after-rebate battery price for your WA postcode. It reads the live federal rebate and flags the state scheme, so the number is current today.
How much does a battery cost after the WA rebate?
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At a glance
What every WA home gets (federal)
The federal Cheaper Home Batteries Program applies in every WA postcode. A 10 kWh battery in Perth gets up to around $2,700 off at install. The exact figure depends on your battery's usable size and the current certificate price, so the check gives you your real number.
The rebate is paid per usable kWh and tapers as the battery gets bigger. Most home batteries sit in the top band. Bigger is not always better value once you pass about 14 kWh, which the sizing check accounts for.
The federal rate dropped on 1 May 2026 and now steps down every 6 months, not once a year. Some older WA guides also quote a combined state-plus-federal figure of $5,000 or $7,500. Those numbers are out of date. Treat any fixed dollar figure as a guide and confirm your own in the check.
The federal STC factor by install period. The rebate is a number of certificates (STCs) per usable kWh, and that per-kWh factor falls on a legislated timetable. This is the Clean Energy Regulator schedule, applied to the first 14 kWh of usable capacity, and it is the same in every state:
| Install period | STC factor per usable kWh | Change |
|---|---|---|
1 Jan to 30 Apr 2026 | 8.4 | none |
Most popular 1 May to 31 Dec 2026 (now) | 6.8 | down about 19% |
1 Jan to 30 Jun 2027 | 5.7 | down about 16% |
1 Jul to 31 Dec 2027 | 5.2 | down about 9% |
1 Jan to 30 Jun 2028 | 4.6 | down about 12% |
What that works out to in dollars, by battery size. Approximate federal discount at the current (1 May to 31 Dec 2026) rate, off the invoice. The same figures apply Australia-wide because the battery rebate is federal, not zone-rated. Your exact number depends on the certificate price on the day, and the 30-second check returns the live figure.
| Usable battery size | Approx. federal rebate now | After 1 Jan 2027 (est.) |
|---|---|---|
10 kWh | around $2,450 | around $2,050 |
Most popular 13.5 kWh (Powerwall-class) | around $3,300 | around $2,750 |
16 kWh | around $3,750 | around $3,150 |
24 kWh | around $4,950 | around $4,150 |
Figures are indicative and rounded, not a quote. The 14 to 28 kWh portion is subsidised at about 60% and 28 to 50 kWh at about 15%, which is why the per-kWh value tapers on the larger sizes.
Full federal-side detail in the pillar guide: Battery Rebate Australia 2026.
What WA adds on top (and why it runs out)
WA runs the Residential Battery Scheme, a state rebate that stacks on top of the federal one. The amount depends on your network. Synergy customers (Perth metro and most of the south-west grid) get up to around $1,300. Horizon customers (regional WA) get up to around $3,800.
On top of the rebate, WA offers an interest-free loan of up to $10,000 to cover the rest of the battery cost, for households under a $210,000 income test. That can take most homes to little or no upfront cash.
Here is the catch. The state scheme has a capped allocation of around 100,000 systems statewide, and it is running down. The federal rebate keeps going either way, but the WA top-up is the part that can close once the allocation is gone. The check shows your federal number first, then whether the state scheme still has room for your postcode.
Do you qualify?
Most WA homes do. You qualify for the federal rebate if you have solar (existing or new), install a battery between 5 and 100 kWh through an accredited installer, and pick a battery on the approved product list. There is no income test on the federal side, and the battery must be VPP-capable.
The WA state rebate needs you to be a Synergy or Horizon customer and to enrol the battery in a Virtual Power Plant. The interest-free loan adds the $210,000 income test. Perth metro plus regional centres like Bunbury, Geraldton and Karratha are covered. The 30-second check confirms your postcode and which extras apply.
Worked example: 10 kWh battery in Perth
Perth home on Synergy, existing 6.6 kW solar, adding a 10 kWh battery and claiming the WA state rebate on top of the federal one.
| Line item | Amount |
|---|---|
Battery installed (list price) | around $12,000 |
Most popular Federal rebate at invoice | up to around -$2,700 |
WA state rebate (Synergy) | up to around -$1,300 |
Your net cost | around $8,000 |
Horizon customers in regional WA get up to around $3,800 from the state scheme instead, which can bring the net cost closer to $5,500 on the same battery. First-year bill savings in Perth run about $900 to $1,400, with payback in roughly 5 to 8 years.
Your home is not the example. The check uses your postcode, your network, your bill and your roof, and returns your real after-rebate number.
Why waiting costs you
Two clocks are running in WA. The federal rebate steps down every 6 months, with the next cut on 1 January 2027. And the state allocation is capped and running down, so the WA top-up can close before the federal one even moves.
Perth install lead times run 4 to 8 weeks, longer in regional WA, so a signed contract by early November 2026 locks in today's federal rate. The check is the fastest way to see your number and whether the state scheme still has room.
Check your WA rebate before the allocation runs out
Frequently asked questions
In Western Australia, the main solar battery rebate in 2026 is the federal Cheaper Home Batteries rebate, worth around $2,500 to $2,700 off a 10 kWh battery depending on the STC price. It comes off the invoice at install and steps down again on 1 January 2027. Western Australia has offered a Residential Battery rebate that can stack on the federal one, so check whether the allocation is still open when you get a quote.
Up to around $2,700 off a 10 kWh battery from the federal Cheaper Home Batteries Program, paid at install, which steps down every 6 months. On top, the WA Residential Battery Scheme adds up to around $1,300 for Synergy customers or up to around $3,800 for Horizon customers. There is also a WA interest-free loan of up to $10,000 for households under a $210,000 income test. The 30-second check returns your real number.
Yes. The WA Residential Battery Scheme is active and stacks on top of the federal rebate, worth up to around $1,300 for Synergy customers or up to around $3,800 for Horizon customers. The allocation is capped at around 100,000 systems statewide and is running down, so the state piece is the part most likely to close first.
For the WA state rebate, yes, the amount depends on whether your network is Synergy (up to around $1,300) or Horizon (up to around $3,800), and you need to enrol the battery in a Virtual Power Plant. The federal rebate applies regardless of retailer. The interest-free loan adds a $210,000 income test.
The federal rebate keeps going and steps down every 6 months. The WA Residential Battery Scheme has a capped allocation of around 100,000 systems and is running down, so the state top-up can close once the allocation is used up. Checking early is how you confirm the state scheme still has room for your postcode.
