Western Australia runs its own battery scheme on top of the federal Cheaper Home Batteries discount. The catch is that you must join a virtual power plant (VPP) to get the state part.
The WA Residential Battery Scheme
- Rebate: up to $1,300 if you are a Synergy customer, or up to $3,800 if you are a Horizon Power customer.
- Battery size: the rebate covers batteries with 5 to 10 kWh of usable capacity.
- VPP: joining a VPP under a two-year agreement is mandatory.
- Timing: the battery must have been installed on or after 1 July 2025.
- Who: WA residents aged 18 or over who are Synergy or Horizon Power customers.
The no-interest loan
Eligible households can borrow $2,001 to $10,000 with no interest, repaid over 3 to 10 years. The loan can also cover solar panels and inverters installed at the same time as the battery. It is available to households with a gross income under $210,000.
Combining it with the federal discount
The federal discount is worked out on usable capacity and the date your installation is signed off. For a 10 kWh battery installed before 1 January 2027 it is about $2,520 to $2,720. Add the $1,300 Synergy rebate and the combined support is roughly $3,800 to $4,000. Some older material still quotes $5,000 for the same battery, which was correct before the federal factor fell on 1 May 2026.
Use the battery rebate calculator for the federal part, and read our guide to virtual power plants before you sign the VPP agreement.