WA solar battery rebate calculator 2026
A 13.5 kWh battery in Western Australia attracts $3,631 under the federal Cheaper Home Batteries Program, plus $1,300 from the WA Residential Battery Scheme (Synergy customers), for $4,931 in total. The federal rate drops to 5.7 STCs per usable kWh on 1 January 2027, which is $599 less on the same battery. Set your postcode, bill and battery size below for your own number, including solar STCs if you are adding panels.
Type your postcode and your number appears here. Federal battery discount, solar STCs, state extras, all stacked, all sourced. Nothing gated.
Pre-set to Perth (6000) · federal battery discount · solar STCs · WA incentive · next step-down 1 January 2027
What the calculator stacks in WA
Three things, in this order. The federal Cheaper Home Batteries discount, 6.8 STCs per usable kWh at $39.90 a certificate. The federal solar STC rebate, about $1,796 on a 6.6 kW system in WA's STC Zone 3, if you are installing panels too. And the WA Residential Battery Scheme (Synergy customers), worth $1,300 on a 13.5 kWh battery. Closed programs are never included.
WA calculator questions
How do I calculate the federal battery rebate?
Multiply your battery's usable capacity by 6.8 STCs per kWh, round down to a whole certificate, then multiply by the $39.90 certificate price. Only the first 14 kWh counts in full: capacity from 14 to 28 kWh counts at 60%, 28 to 50 kWh at 15%, nothing above. A 13.5 kWh battery earns 91 STCs, about $3,631 gross, which your installer takes off the quote rather than paying you.
How much does the battery rebate drop?
On 1 January 2027 the federal factor falls from 6.8 to 5.7 STCs per usable kWh. On a 13.5 kWh battery that is $3,631 today versus $3,032 after, a drop of $599 for the same install. It keeps stepping down every 1 January and 1 July until the program ends on 31 December 2030. The date that counts is the certificate of electrical compliance, not the day you sign.
How much is the battery rebate in Western Australia?
About $4,931 on a 13.5 kWh battery: $3,631 federal plus $1,300 from the WA Residential Battery Scheme (Synergy customers). Add the federal solar STC rebate of about $1,796 on a 6.6 kW system if you are installing panels at the same time. Verified 13 July 2026.
Full detail on the WA solar battery rebate, the whole WA rebate stack including solar, the national battery rebate calculator and the Cheaper Home Batteries Program explainer.