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Perth homeowners on the Synergy network can stack three separate rebates on a solar + battery system. Here's how each one works, what you actually get, and a worked example using the current rates.
On your solar panels (per kW installed)
Small-scale Technology Certificates discount the up-front cost of the panels themselves, based on system size and Perth's STC zone. Claimed once, at install, and assigned to your installer for the discount.
On your battery (per kWh of usable capacity)
The national battery discount is delivered as STCs on your battery's usable capacity, for batteries connected to new or existing rooftop solar. The factor steps down every six months and tapers band by band above 14kWh, so the effective rate is highest on right-sized batteries installed sooner.
Synergy customers · $130/kWh, capped at $1,300
Western Australia's own battery rebate for Synergy (SWIS) households, on top of the federal rebates. It pays $130/kWh of usable capacity up to a $1,300 cap (reached at 10kWh), with a 5kWh minimum.
Combined federal battery rebate + WA Residential Battery Scheme by usable capacity, at the current STC rate. Solar STCs on your panels are additional. Figures are indicative estimates assigned as an up-front discount by your installer.
| Usable capacity | Federal battery rebate | WA Battery Scheme | Total battery rebate |
|---|---|---|---|
| 5 kWh | $1,357 | $650 | $2,007 |
| 10 kWh | $2,713 | $1,300 | $4,013 |
| 13.5 kWh | $3,631 | $1,300 | $4,931 |
Synergy (SWIS) network only. The WA scheme caps at $1,300 (reached at 10kWh), so above 10kWh only the federal rebate keeps growing. That federal rebate itself tapers on capacity above 14kWh and stops entirely at 50kWh, the maximum battery capacity STCs are paid on.
Earn ongoing credits when your battery supports the grid during peak demand. Joining a VPP is mandatory for the WA Battery Scheme rebate — it always has been.
70¢
per kWh during activation events
~$150
annual credits (10kWh battery)
30
max events per year
Programs that add to your savings beyond the two rebates.
Time-of-use feed-in credits for solar exports, compatible with Battery Rewards.
Peak (3pm-9pm)
10¢/kWh
Off-peak
2¢/kWh
DEBS credits are paid in addition to Battery Rewards activation credits.
From May 2026, your export limit depends on your customer tier selection.
The two rebates are claimed differently. The federal STC discount is applied by your installer; the WA rebate is lodged for you by an approved vendor.
Important note
Most installers handle the entire STC rebate process on your behalf. The rebate value is deducted from your final invoice, meaning you pay less upfront. Always confirm this with your installer before signing any contracts.
The WA Residential Battery Scheme pays Synergy (SWIS) customers $130/kWh of usable battery capacity, capped at $1,300. A battery of 10kWh or larger reaches the full $1,300. A minimum of 5kWh usable capacity is required to qualify.
Yes. The federal battery rebate (delivered as STCs on your battery's usable capacity) and the WA Residential Battery Scheme stack — you claim both on the same battery. Federal solar STCs on your panels stack on top again. All three are normally applied as an up-front discount by your installer.
Western Australian households on the Synergy network (the SWIS — Perth, the South West and the Wheatbelt), with a new eligible battery of at least 5kWh usable capacity installed on or after 1 July 2025 by an approved vendor. The battery must be on the Clean Energy Council approved list, and the household must join a Virtual Power Plant — VPP participation is mandatory, and declining it means no rebate. One rebate per property, and your approved vendor lodges the application for you.
The federal battery rebate steps down every six months as the STC factor declines, and since 1 May 2026 a capacity taper also reduces the STCs claimable on larger batteries (full rate on the first 14kWh, reduced marginal rates above that). The factor that applies is the one in force on your installation date, not the date you sign — a quote can't lock in an earlier rate.
The WA rebate is maximised at 10kWh of usable capacity (the $1,300 cap), and the federal taper favours batteries up to 14kWh. Beyond that the extra rebate per kWh falls, so size the battery to your evening usage rather than to the rebate — our matcher does this for you.
Yes. Alongside the rebate, the WA Residential Battery Scheme offers eligible households a no-interest loan of up to $10,000, gated on household gross income under $210,000. It requires the same VPP participation, and your approved vendor lodges the loan application with the rebate.
For the federal battery rebate, yes — it applies to eligible batteries connected to new or existing rooftop solar, so a battery with no solar behind it doesn't qualify. A battery is far more valuable paired with solar anyway (it stores your daytime generation for evening use), and most installs are solar + battery. The WA Residential Battery Scheme and the federal battery rebate are both claimed on the battery; the federal solar STCs are claimed on the panels.
Adding a battery to an existing solar system? Our adding a battery to solar guide covers hybrid vs non-hybrid inverters, AC/DC coupling and gateway devices.
Compare quotes from SAA-accredited local installers — you choose which to act on. No obligation, no pressure.
Last updated 21 August 2026. Rebate figures are computed from current STC rates and the WA Residential Battery Scheme parameters; they are indicative estimates, not a quote. Sources: Australian Government — solar & batteries and the WA Government Residential Battery Scheme. Western Power / Synergy (SWIS) network only.