WA households get the most generous battery rebate stack of any Australian jurisdiction in 2026. The Residential Battery Scheme (RBS) adds a state subsidy on top of the federal Cheaper Home Batteries Program.
Synergy customers (Perth metro and most of the SWIS) can stack the federal + state combined to up to $5,000 on the first 10 kWh of usable battery capacity.
Horizon Power customers (regional WA on the North West Interconnected System) stack to up to $7,500 on the same first 10 kWh, the highest single-state battery rebate in Australia.
VPP enrolment is required. Allocations are capped at 100,000 systems across the state and are running down. Here's how the WA stack works.
At a glance
The federal piece (every WA postcode)
The federal Cheaper Home Batteries Program applies in every WA postcode. From 1 May 2026, the first 14 kWh of any battery's usable capacity gets the full STC factor (6.8 STCs per kWh, around $252 per kWh net).
A 10 kWh battery in Perth gets approximately $3,300 off from the federal rebate. WA is STC Zone 3 (same as NSW + SA), so federal numbers do not vary materially from the eastern states.
Full federal-side detail in the pillar article: Battery Rebate Australia 2026.
The WA Residential Battery Scheme
The WA Residential Battery Scheme launched mid-2024 and committed to 100,000 subsidised installations across the state. Two retailer tiers, two different cap amounts, but the same eligibility framework underneath.
The state subsidy stacks on top of the federal rebate. The state amount is calculated against the first 10 kWh of usable capacity; capacity above that earns federal rebate only.
VPP enrolment is mandatory. The participating VPP partners are the customer's retail electricity provider (Synergy on the SWIS, Horizon Power on the NWIS). There is no third-party VPP option for the WA stack.
Synergy vs Horizon Power: which stack you get
Horizon Power's larger subsidy reflects the higher value of distributed storage on the smaller, more isolated NWIS grid. Regional customers (Karratha, Port Hedland, Broome) get a meaningfully larger combined rebate than Perth metro.
If you're not sure which retail network covers your address, the WA government's scheme page has a postcode lookup. Or check your electricity bill for the retailer name.
Eligibility for WA households
Federal rebate: any WA property with solar, battery 5 to 100 kWh, SAA-accredited installer, CEC-approved battery.
WA Residential Battery Scheme: retail customer of Synergy or Horizon Power, battery between 5 and 100 kWh usable, VPP enrolment with the network retailer, battery on the WA-approved product list (subset of the federal CEC list).
One subsidy per property. Owners of multiple WA properties can claim a separate stack at each one (each must have its own electricity meter, or NMI).
Check both WA rebates against your postcode
30 secs · Free · No obligationWorked example: 10 kWh battery in Perth
Synergy customer in Perth metro, retrofitting a 10 kWh battery to an existing 6.6 kW rooftop solar system.
List price installed: approximately $12,500 (Perth is a fraction higher than Sydney due to shipping).
Federal rebate: $3,300 off at invoice.
WA RBS Synergy top-up: $1,700 (to bring the combined federal + state to $5,000 on the first 10 kWh), paid by the retailer after VPP activation.
Net cost: $7,500 to the household. Horizon Power customers in regional WA on the same battery would pay approximately $5,000 net.
First-year bill savings: $1,000 to $1,500, factoring in WA's lower retail FiTs (DEBS) and the time-of-use export window. Payback in 5 to 8 years.
How to claim both rebates
Both rebates go through the installer. WA RBS requires you to be a current customer of Synergy or Horizon Power at the install address, and the installer must be on the WA RBS-approved installer list (a subset of CEC-accredited installers).
The state subsidy is applied by the retailer once the VPP enrolment activates, typically 30 to 60 days post-install. The federal rebate is at invoice.
Lock in your WA stack
The WA RBS allocation cap is the key urgency. 100,000 installations across the entire state, with allocation already drawn down through 2024 and 2025. Once the cap is reached, the state piece closes. No extension has been announced.
The federal step-down on 1 January 2027 stacks the urgency: even if WA RBS allocations are still open, the federal piece shrinks by about $580 on a 10 kWh battery.
Practical deadline: signed contract by early November 2026 to lock in today's combined rate. Regional WA install lead times can run 10 to 14 weeks for Horizon Power postcodes (Karratha, Port Hedland, Broome) due to installer availability and shipping.
Lock the WA stack before allocations close
30 secs · Free · No obligationFrequently asked questions
Joe White
Joe has over five years of experience in the renewable energy sector. Based in Australia, he is dedicated to advancing sustainable energy solutions to benefit both the environment and local communities. In his spare time, Joe loves to surf and take his dog, Mitchy, on road trips to explore the road less traveled.
