WA battery rebate: what stacks with the federal discount

Western Australia is where federal and state battery support actually meet on a typical household quote. The Cheaper Home Batteries Program currently pays about $252 per usable kWh in the first tier (verified 12 July 2026). On top of that, the WA Residential Battery Scheme pays a separate per-kWh amount that differs for Synergy customers on the SWIS and Horizon Power customers in regional networks — both streams stack with the federal discount when eligibility holds.

Federal discount first

Every eligible WA home starts with the same national rules: CEC-approved battery, accredited installer, usable capacity in the program’s nominal range, and — for grid-connected systems — VPP-capable hardware where required. Since 1 May 2026 the federal payment uses three tiers ending at 50 kWh usable. Install date sets the rate.

For our reference 13.5 kWh system, the federal rebate at current assumptions is $3,367 (91 STCs × $37). That figure is the floor of the stacking maths below — state money sits on top, it does not replace it.

WA schemes at a glance

Synergy’s listed rate is $300 per usable kWh capped at $1,500. Horizon’s listed rate is $500 per usable kWh capped at $2,500. Higher Horizon support reflects greater network value in regional and remote systems — it is not a Perth metro rate.

Synergy vs Horizon: which bucket are you in?

If you live in greater Perth, Mandurah, or most of the south-west grid, you are almost certainly a Synergy customer on the SWIS. Horizon Power is the vertically integrated utility for many towns and remote networks outside that grid. The WA scheme splits because the network benefit of a residential battery is different in each footprint.

Practically: pull a recent electricity bill. If it says Synergy, use the Synergy row and the $1,500 cap. If it says Horizon Power, use the Horizon row. Do not average the two — installers will not.

DEBS feed-in context

Synergy’s Distributed Energy Buyback Scheme (DEBS) pays for exported solar by time band. Our FiT snapshot for WA currently spans about 2.5–10 c/kWh across reference offers (verified 12 July 2026). Midday exports are often at the bottom of that range; evening bands are higher — but still a fraction of the retail import rate you avoid by self-consuming.

That is why batteries show up in WA payback conversations even when the export tariff looks “fine” on paper. Shifting your own evening cooking and air-con load displaces expensive imports. Exporting surplus at a few cents is the leftover, not the plan. See also our feed-in tariff overview and is a battery worth it? guide.

Worked stacking example: 13.5 kWh

Using the site’s Powerwall-class reference system (13.5 kWh battery (Powerwall 3 class), typical installed cost $14,000):

Notice the WA lines hit the cap: 13.5 × Synergy’s per-kWh rate exceeds $1,500, so the state payment stops at the cap. Same pattern for Horizon at $2,500. Oversizing past the federal full-rate band (14 kWh) does not unlock more state dollars once the cap is reached.

Perth install-cost note

Perth quotes for a mid-size battery commonly land in a band around the reference $14,000 before rebates, but site works, inverter pairing, three-phase upgrades, and product choice move that number. Freight into WA and installer diaries also matter. Treat published “from” prices as marketing floors; the stacking table above is for comparing support dollars, not for locking a contract price.

For a package view that includes panels, see solar + battery package costs in Perth.

Eligibility checklist (both layers)

Federal

• Battery on the CEC-approved list for the program
• Accredited installer; one system per property under program rules
• Usable / nominal capacity within the published eligible range
• Grid-connected systems: VPP-capable where required

WA Synergy stream

• Existing or simultaneous rooftop solar
• Synergy residential customer on the SWIS
• Battery on the CEC-approved list
• Accredited installer

WA Horizon stream

• Horizon Power residential customer
• Eligible remote/regional network location
• Battery on the CEC-approved list

Calculate my federal rebate

Sources

• Cheaper Home Batteries Program
• WA Residential Battery Scheme (Synergy)
• WA Residential Battery Scheme (Horizon Power)
• Synergy / DEBS reference