The short answer
Western Australia's Residential Battery Scheme pays a rebate on top of the federal battery discount:
- Synergy customers: $130 per kWh of usable capacity, up to $1,300.
- Horizon Power customers: $380 per kWh, up to $3,800.
- The federal discount: around 30% - up to $2,720 on a 10 kWh battery installed between May and December 2026.
- A no-interest loan of up to $10,000 over up to 10 years, for households with a combined income under $210,000.
- The catch: to get the WA rebate or loan you must join a virtual power plant offered by Synergy or Horizon Power (or an approved alternative for Synergy customers).
Battery rebate calculator
Type the usable capacity on the battery's spec sheet. The federal certificates use the factor for the install date and the 14 kWh, 28 kWh and 50 kWh steps; the WA rebate is paid per kWh up to 10 kWh.
Up to $4,020 off
- Usable capacity
- 10 kWh
- Certificates (STCs) at the May to December 2026 factor of 6.8
- 68
- Federal discount at $40 a certificate
- up to $2,720
- WA rebate (Synergy)
- $1,300
- Installed price in our solar cost guide, Battery 10–13 kWh (mid-range)
- $8,000 to $15,000
Enter the price on your quote to see what you would pay. Ask the installer to show the number of certificates and the price per certificate on the quote.
The NSW payment is set by your virtual power plant provider and contract, so it is not added here. Prices are the installed bands from our solar cost guide.
How the WA battery rebate works
The rebate is paid per kWh of usable capacity and capped at 10 kWh, so a battery of 10 kWh or more gets the full $1,300 (Synergy) or $3,800 (Horizon Power). The battery needs at least 5.0 kWh of usable capacity, the rebate is limited to one per property, and systems bought before the scheme started on 1 July 2025 are not eligible.
| Usable capacity | WA rebate, Synergy | WA rebate, Horizon Power | Federal discount, May to Dec 2026 | Total, Synergy | Total, Horizon Power |
|---|---|---|---|---|---|
| 5 kWh | $650 | $1,900 | $1,360 | $2,010 | $3,260 |
| 10 kWh | $1,300 | $3,800 | $2,720 | $4,020 | $6,520 |
| 13.5 kWh | $1,300 | $3,800 | $3,640 | $4,940 | $7,440 |
The scheme runs until 100,000 rebates have been paid, which was expected (as of December 2025) to last until 2027.
Joining a virtual power plant
The WA rebate and loan both require you to join a virtual power plant offered by Synergy or Horizon Power, or an approved alternative for Synergy customers. The federal discount only needs a battery and inverter that are able to join one.
How much the federal discount is worth in WA
The discount comes as small-scale technology certificates (STCs). Each kWh of usable capacity earns certificates at the STC factor for the day the battery is installed - 6.8 for May to December 2026. Since 1 May 2026 the full factor applies to the first 14 kWh, 60% of it to each kWh from 14 to 28 kWh, and 15% of it to each kWh from 28 to 50 kWh. No certificates are created for capacity above 50 kWh.
| Usable capacity | Certificates, May to Dec 2026 | Discount at $40 | Certificates, Jan to Jun 2027 | Discount at $40 |
|---|---|---|---|---|
| 5 kWh | 34 | $1,360 | 28 | $1,120 |
| 10 kWh | 68 | $2,720 | 57 | $2,280 |
| 13.5 kWh | 91 | $3,640 | 76 | $3,040 |
| 20 kWh | 119 | $4,760 | 100 | $4,000 |
| 30 kWh | 154 | $6,160 | 129 | $5,160 |
| 50 kWh | 174 | $6,960 | 146 | $5,840 |
The government buys these certificates through the STC Clearing House at a fixed $40 each, excluding GST. The discount your installer gives is based on the certificates the battery creates, so ask for the number of certificates and the price per certificate on the quote.
The discount drops every six months
The factor that counts is the one in force on the day the battery is installed, and it falls every six months from 1 May 2026. It is set to keep the discount at around 30% of the upfront cost.
| Battery installed | STC factor |
|---|---|
| January to April 2026 | 8.4 |
| May to December 2026 | 6.8 |
| January to June 2027 | 5.7 |
| July to December 2027 | 5.2 |
| January to June 2028 | 4.6 |
| July to December 2028 | 4.1 |
| January to June 2029 | 3.6 |
| July to December 2029 | 3.1 |
| January to June 2030 | 2.6 |
| July to December 2030 | 2.1 |
On a 10 kWh battery, installing in January 2027 instead of December 2026 means $440 less discount.
Who can get the federal battery discount
- The battery is connected to a new or existing solar PV system. A battery that only stores energy from the grid is not eligible.
- It is on the Clean Energy Council approved battery list and is installed by a Solar Accreditation Australia accredited installer with battery endorsement.
- The battery and its inverter are able to join a virtual power plant. You do not have to join one.
- It is the first battery at the premises to claim. A battery added later at the same premises cannot claim again.
- It was installed on or after 1 July 2025 and has a capacity of 5 kWh to 100 kWh.
- Households, businesses and community organisations can all claim it.
You do not apply to the government. The accredited installer or retailer takes the discount off the price, or pays it to you as a rebate after installation. You can instead create and sell the certificates yourself through the REC Registry.
What a home battery costs
Installed prices from our solar cost guide:
- Battery 5 kWh (e.g. Sungrow): $5,000 to $9,000
- Battery 10–13 kWh (mid-range): $8,000 to $15,000
- Tesla Powerwall 3 (13.5 kWh): $12,000 to $17,000
Ask every installer whether their price is before or after the federal discount, so you compare like with like.
Frequently asked questions
How much is the WA battery rebate?
$130 per kWh of usable capacity for Synergy customers, up to $1,300, or $380 per kWh for Horizon Power customers, up to $3,800, capped at 10 kWh. It is paid on top of the federal battery discount.
Do I have to join a VPP to get the WA battery rebate?
Yes. To get the WA rebate or loan you must join a virtual power plant offered by Synergy or Horizon Power, or an approved alternative for Synergy customers.
Can I get the WA rebate and the federal battery discount together?
Yes. The WA rebate is paid on top of the federal discount: on a 10 kWh battery installed between May and December 2026 the two together come to up to $4,020 for a Synergy customer or $6,520 for a Horizon Power customer.
Is there a minimum battery size for the WA rebate?
Yes. The battery needs at least 5.0 kWh of usable capacity, and the rebate is limited to one per property.
How long will the WA battery rebate last?
It runs until 100,000 rebates have been paid, which was expected as of December 2025 to last until 2027.
Can I get a loan for a battery in WA?
Households with a combined annual income under $210,000 can get a no-interest battery loan of up to $10,000, repaid over up to 10 years.
Compare quotes from local battery installers, and ask each one how many certificates the battery creates and what they pay per certificate.
Get battery quotes →Sources
Rebate rules, amounts and dates change, and every program has its own eligibility rules - confirm with the program below before you sign a quote. Checked against these pages in October 2026:
- Small-scale technology certificates (STCs) for batteries - DCCEEW (dcceew.gov.au) · www.dcceew.gov.au/energy/programs/cheaper-home-batteries/small-scale-technology-
- Solar batteries | Clean Energy Regulator (cer.gov.au) · cer.gov.au/schemes/renewable-energy-target/small-scale-renewable-energy-scheme/s
- Cheaper Home Batteries Program - DCCEEW (dcceew.gov.au) · www.dcceew.gov.au/energy/programs/cheaper-home-batteries
- Eligibility information for the Cheaper Home Batteries Program - DCCEEW (dcceew.gov.au) · www.dcceew.gov.au/energy/programs/cheaper-home-batteries/eligibility-information
- Calculate small-scale technology certificate entitlements | Clean Energy Regulator (cer.gov.au) · cer.gov.au/schemes/renewable-energy-target/small-scale-renewable-energy-scheme/s
- Virtual power plant (VPP) incentive | NSW Climate and Energy Action (energy.nsw.gov.au) · www.energy.nsw.gov.au/households/grants-rebates/household-energy-saving-upgrades
- WA Residential Battery Scheme (wa.gov.au) · www.wa.gov.au/organisation/energy-policy-wa/wa-residential-battery-scheme
- WA Residential Battery Scheme - Eligibility Requirements (wa.gov.au) · www.wa.gov.au/organisation/energy-policy-wa/wa-residential-battery-scheme-eligib
Related guides
- Solar battery rebate: what you get in 2026
- Solar battery rebate in NSW
- Solar battery rebate in Queensland
- Solar battery rebate in Victoria
- Solar battery rebate in South Australia
- Solar panel rebates in 2026: federal and state
- Solar Calculator: STCs, Output, Cost and Payback
- Solar + Battery vs Solar Only: 2026 Cost Comparison (with Rebates)
- Solar & Battery Cost Australia 2026