WA battery rebate 2026: Synergy and Horizon Power explained

The short answer

The rebate is paid on usable capacity, for batteries of at least 5 kWh, and on up to 10 kWh. A bigger battery can still join the scheme and receives the cap. One rebate per property (wa.gov.au, eligibility requirements, last updated 15 April 2026, read 30 October 2026).

1. What the WA and federal rebates add up to

The WA Government states that the scheme is in addition to the federal Cheaper Home Batteries Program (wa.gov.au, WA Residential Battery Scheme, last updated 15 October 2026). The federal part depends on the battery size and the installation date. At today's factor (6.8 certificates per kWh, Clean Energy Regulator, last updated 31 July 2026) and about $38 a certificate:

Both amounts come off the price: the WA rebate and loan are paid directly to the accredited vendor (wa.gov.au, questions and answers, last updated 4 August 2026), and the federal discount is applied by the installer through certificates.

2. Why the "up to $5,000 / $7,500" figures are out of date

When the WA rebate was raised in June 2025, the Government announced up to $5,000 (Synergy) and $7,500 (Horizon Power) towards a 10 kWh battery in the first year, federal discount included (wa.gov.au announcement, 3 June 2025). The WA part has not changed since, but the federal part has: the factor steps down every six months. For a 10 kWh battery installed today, the total is closer to $3,884 and $6,384.

It falls again on 1 January 2027, when the federal factor drops to 5.7. A 10 kWh battery installed between January and June 2027 would get about $2,166 federal, so about $3,466 with Synergy and $5,966 with Horizon Power. The WA cap does not move (what the January cut costs, by size).

3. The conditions that come with the WA rebate

• A virtual power plant is compulsory. Synergy customers join a Synergy VPP product or an approved alternative supplier listed by Energy Policy WA. Horizon Power customers join a Horizon Power VPP product.
• Who can apply: an Australian permanent resident aged 18 or over, who is a Synergy or Horizon Power customer.
• The home: in WA, mainly residential, with an ongoing internet connection. Owner-occupiers qualify; so do landlords with the tenant's consent, and tenants with the landlord's prior written consent.
• The battery: on the Synergy or Horizon Power supported list and on the Clean Energy Council approved list, installed by a licensed electrician accredited by Solar Accreditation Australia for grid-connected battery systems.
• Timing: after conditional approval you have six months to install, otherwise you reapply. Systems bought before the scheme started on 1 July 2025 are not covered.

Source: wa.gov.au, eligibility requirements, last updated 15 April 2026.

4. The interest-free loan

Households with a combined gross income under $210,000 a year can also borrow, interest-free, from $2,001 up to $10,000, over three to ten years, with no fees other than late fees and no security. The loan plus the rebate cannot exceed the total cost of the installation. It can also cover an inverter and solar panels installed with the battery (wa.gov.au; announcement of 3 June 2025).

5. How long the rebate will last

The scheme runs until its planned 100,000 rebates have been distributed. The WA Government's page says that, as of December 2025, it was expected to remain available until 2027. There is no fixed closing date, so check that it is still open when you get quotes.

Before you get quotes in WA

• Check which retailer supplies your home. The WA rebate is almost three times higher with Horizon Power.
• Ask for the WA rebate and the federal certificates to appear as separate lines, with the price after both.
• Ask which VPP the battery will join and what it pays you. The conditions are set by the VPP product, not by the rebate.
• Ask for a written installation date if you want the 2026 federal factor.