How the WA Battery Rebate works.

Key facts at a glance

1. What is the WA Residential Battery Rebate?

The WA Residential Battery Rebate Scheme is a $337 million state program launched on 1 July 2025. It pays a per-kilowatt-hour discount to WA homeowners who install an eligible home battery via an accredited installer. The scheme is capped at 100,000 households and runs on a first-come, first-served basis - once the cap is hit, applications close regardless of whether the funding runs out.

It was introduced to help WA hit its renewable energy targets, reduce afternoon-peak demand on the grid, and (in regional WA) cut the cost of diesel generation. That last point is why Horizon Power customers get a bigger rebate - every battery installed in the Pilbara or Kimberley saves the state more money on fuel than one in Joondalup.

2. How much can you actually get?

Two numbers matter: the per-kWh rate, and the cap.

• Synergy customers (Perth metro + south-west on the SWIS network): roughly $130 per kWh, capped at $5,000.
• Horizon Power customers (regional WA - Pilbara, Kimberley, Mid West, Goldfields-Esperance, Gascoyne): roughly $300 per kWh, capped at $7,500.

That's just the state rebate. The federal Cheaper Home Batteries Program stacks on top - see section 4.

A typical 13.5 kWh battery (think Tesla Powerwall 3 or Sungrow SBR128) hits both caps. So a Perth Synergy customer claims the full $5,000 state rebate; a Karratha Horizon customer claims the full $7,500.

3. Eligibility - am I in?

To qualify you need to tick all of these:

• You own the home (owner-occupier or landlord - not the renter).
• The property is in Western Australia and connected to either Synergy or Horizon Power.
• The battery is installed by a Solar Accreditation Australia (SAA) accredited installer.
• The battery model is on the SAA approved list (this is updated regularly - more in section 6).
• You haven't already claimed the rebate for this property.

You don't need to already have solar - but most installers will recommend pairing the battery with at least a 5 kW solar system to get the full value out of it.

4. Stacking with the federal Cheaper Home Batteries Program

The federal Cheaper Home Batteries Program started on 1 July 2025 alongside the state scheme. It's an upfront discount applied at the point of sale - your installer claims the federal certificates (STCs) and passes the discount to you.

For 2025–2026, the federal rebate works out to roughly $372 per usable kWh of battery storage. The rate steps down each year through 2030, so installing now captures the highest federal value.

The two rebates stack. A Perth Synergy customer installing a 13.5 kWh battery can expect roughly $5,000 from the state and ~$5,000 from the federal program - about $10,000 off a system that typically sells for $13,000–$16,000 installed.

5. Synergy vs Horizon Power - why your retailer matters

WA's electricity market is split. Most metro and south-west homes are on Synergy (which retails power across the SWIS - the South West Interconnected System). Regional WA - Pilbara, Kimberley, Mid West, Goldfields-Esperance - is served by Horizon Power, which runs ~30 separate microgrids.

This matters for three reasons:

1. Rebate amount. Horizon customers get 50% more in absolute dollars because regional batteries displace expensive diesel generation.
2. Export rates. Synergy uses the Distributed Energy Buyback Scheme (DEBS): you're paid about 10c/kWh in the morning peak (3–9pm) and 2.5c/kWh otherwise. Horizon export rates vary by microgrid.
3. Payback maths. Because Horizon customers face higher per-kWh electricity prices, their payback period is shorter. A battery that pays back in 7 years in Perth might pay back in 4–5 years in Broome.

6. What batteries are eligible?

The SAA maintains the official approved list. It's been growing slowly - at launch only the Tesla Powerwall 3, Sungrow SBR-series, BYD Battery-Box Premium HVS/HVM and a handful of others were included. The list is expanded regularly as manufacturers submit compliant systems.

Two things to check before signing a quote:

• The specific model you're being quoted is currently on the SAA list (not just "the brand is approved").
• The installer is using the model number that matches the approved list - not a similar variant.

7. How to apply - step by step

1. Use the calculator. Get a realistic estimate of your total combined rebate. Run it now →
2. Get 3 quotes. Quotes vary by 20–40% even for identical systems. Always get three. We'll send 3 free quotes →
3. Confirm the model is on the SAA list. Ask the installer to show you the listing.
4. Sign the install agreement. The installer will apply for the rebate on your behalf.
5. Battery is installed. Usually 2–6 weeks after signing depending on stock.
6. Rebate is applied. Federal discount comes off the invoice price; state rebate is processed through Synergy/Horizon and shows up as a bill credit or direct deposit.
7. Done. Switch on, watch the bill drop, never think about it again until the warranty paperwork comes around.

8. Common mistakes that disqualify your application

• Using a non-accredited installer. Always check the SAA register before signing anything.
• Buying a model not on the approved list. "It's the same battery basically" is not a winning argument with the rebate body.
• Signing the contract before the installer lodges the rebate application. The rebate has to be flagged at point of sale.
• Claiming twice for the same property. One rebate per home, ever.
• Installing yourself. Even if you're qualified, self-installation kills the rebate.

9. Should you wait or apply now?

Three reasons to do it sooner rather than later:

• The federal rebate rate steps down each year through 2030. Installing in 2026 captures a higher rate than waiting until 2027.
• The 100,000-home cap is real. Even at a steady uptake rate, the scheme will fill within a few years.
• Every quarter you delay is another $250–$700 in bills you didn't avoid.

Reasons to wait: if you don't already have solar, or if your current solar system is undersized (under 5 kW), upgrade the solar first - or do both in one job. A battery alone, without solar, has a 12+ year payback. A battery paired with solar has a 4–8 year payback.

10. Next step

Run the numbers for your home first. Then get three quotes - the price spread between installers is large enough that two minutes of comparison saves the average WA household over $1,500.