State Battery Guide
Solar Batteries WA 2026: Synergy, Horizon and Federal Rebates
Western Australia runs two parallel battery rebate schemes alongside the federal program: a smaller subsidy for Synergy customers in the South West Interconnected System, and a much larger one for Horizon Power customers in regional and remote WA. Stack with the federal Cheaper Home Batteries rebate and Horizon households can save $6,384 on a 10 kWh install, the most generous combination in Australia.
Your battery rebate, checked before you sign
By Bec Ramirez
9 min read
The federal rebate takes about $3,610 off a 14 kWh battery installed before 1 January 2027, when it steps down.
Current battery rates end 1 January 2027 · 80 days remaining
Why batteries make sense in Western Australia
WA has Australia's highest solar resource (5.2 to 5.8 peak sun hours per day) and a unique two-utility structure: Synergy serves the South West Interconnected System (Perth metro and surrounds) and Horizon Power serves regional and remote WA. Both have introduced battery subsidies as part of the Distributed Energy Buyback Scheme to manage growing rooftop solar in their networks. The result is the most generous battery rebate stacking in Australia, particularly for Horizon Power customers in places like Karratha, Kalgoorlie and Broome where battery storage is genuinely strategic for grid stability.
What you can claim in WA
WA homeowners stack the federal Cheaper Home Batteries Program with the WA Battery Scheme. The federal portion under tiered rates since 1 May 2026 provides around $258 per kWh on the first 14 kWh ($2,584 for a 10 kWh battery, $3,458 for 13.5 kWh). The WA portion depends on which utility serves your home: Synergy customers receive $130 per kWh up to 10 kWh ($1,300 maximum), while Horizon Power customers receive $380 per kWh up to 10 kWh ($3,800 maximum). Combined, a Synergy customer can save around $3,884 on a 10 kWh install; a Horizon Power customer can save $6,384 on the same install. Both schemes require enrolment in an approved Virtual Power Plant.
Example: Tesla Powerwall 3 (13.5 kWh)
Example only. Actual price varies with installer, switchboard work, and battery model. The federal rebate is calculated on usable capacity in tiered bands.
Your battery rebate, checked before you sign
The federal rebate takes about $3,610 off a 14 kWh battery installed before 1 January 2027, when it steps down. One Why Solar Approved installer near you, and fifteen minutes with a solar expert before you sign.
Current battery rates end 1 January 2027 · 80 days remaining
Which battery should you buy in WA?
Tesla Powerwall 3 and Sungrow SBR are the most-installed batteries in WA. Tesla's direct presence in Perth makes warranty service straightforward. Sungrow offers better value per kWh and excellent thermal management for the hot WA summers. BYD Battery-Box Premium has strong installer support in Perth. For Horizon Power customers in remote areas, ruggedness and cyclone-rating matter more; consider IP65-rated enclosures and outdoor-mountable units. Most WA households with 6.6 to 10 kW solar benefit from 10 to 13.5 kWh of storage. The WA Battery Scheme caps subsidy at 10 kWh, so going larger only earns the federal portion on the additional capacity.
| Battery | Capacity | Federal rebate | Price after rebate |
|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | $3,458 | $9,000–$12,500 |
| BYD Battery-Box Premium | 10.2–20.5 kWh | $2,622–$4,598 | $6,000–$11,500 |
| Sungrow SBR | 9.6–25.6 kWh | $2,470–$5,396 | $5,100–$12,700 |
| Enphase IQ Battery | 10.08 kWh | $2,584 | $5,900–$15,500 |
| Alpha ESS SMILE5 | 5.7–34.2 kWh | $1,444–$6,004 | $6,800–$11,000 |
Final price ranges include installation. Federal rebate values reflect the tiered structure in effect since 1 May 2026.
What installation looks like in Perth and beyond
Perth metro installations typically add $1,500 to $2,500 on top of battery hardware. Regional WA installations can run $3,000 to $5,000 in additional logistics, particularly for remote sites accessible only by long road transport. Both Synergy and Horizon Power require VPP-capable commissioning and approved installer accreditation. Western Power network applications can take 2 to 4 weeks. Demand surged through 2025 and remains elevated; metro Perth installer lead times of 4 to 8 weeks are common in 2026.
See the battery rebate your quote should show
The federal rebate takes about $3,610 off a 14 kWh battery installed before 1 January 2027, when it steps down. Then a solar expert goes through it with you, and your quote, before you sign.
Current battery rates end 1 January 2027 · 80 days remaining
Get a battery quote for your WA home
Matched with one reliable, experienced local installer. No pushy sales, no spam, no calls until you say so. The federal STC factor steps down on 1 January 2027, so installing sooner secures a larger rebate.
Get my free WA battery quotearrow_forwardSources
The next step
If you're considering a home battery system, Bec and the team can match you with one Why Solar Approved installer near you for a free written quote, and fifteen minutes with a solar expert before you sign.
Written by
Aussie Mum & Energy Expert
Helps families switch to solar with practical, real-world advice. Bec focuses on the financial side: rebates, bill savings and financing options, so everyday Australians can see real value from going solar.
If you have any questions about the information in this guide, email hello@whysolar.com.au or call +61 2 5657 6527.