Updated 10 October 2026: re-checked against wa.gov.au, and the stacked figures re-priced at the 15 October 2026 price of $39.65 per STC. Gross and net are now labelled separately.
Western Australia's Residential Battery Scheme covers batteries installed from 1 July 2025. The amount depends on which network you're on, and joining a virtual power plant (VPP) is a condition.
Synergy customers (South West Interconnected System)
$130 per usable kWh, capped at $1,300 (reached at 10 kWh). Larger batteries still qualify for the capped amount. VPP enrolment is mandatory.
Horizon Power customers (regional and remote)
$380 per usable kWh, capped at $3,800. VPP enrolment is also required.
Combined federal and state stack, 10 kWh battery
- Federal Cheaper Home Batteries: 68 STCs ≈ $2,696 gross
- WA Residential Battery (Synergy): $1,300
- Combined: about $3,996 gross, a little less on your quote after the installer's certificate fees on the federal part
For a Horizon customer the stack is about $2,696 federal + $3,800 state = about $6,496 gross.
An interest-free loan of up to $10,000 is available alongside the rebate for households with a gross income under $210,000, and it can cover solar panels installed with the battery.