How do I calculate my battery rebate?

Take the usable capacity in kWh. The first 14 kWh counts in full, 14 to 28 kWh at 60%, and 28 to 50 kWh at 15%. Multiply by the STC factor for your installation date and round down to whole certificates, then multiply by the certificate price your installer passes on.

Does the battery rebate depend on where I live?

The federal discount does not: it is the same in every state and postcode. State extras do differ, with Western Australia paying the most.

Battery rebate calculator

A 13.5 kWh battery installed 1 May to 31 Dec 2026 earns 91 certificates under the federal Cheaper Home Batteries Program, about $3,367 off at $37 each. Put in your own battery below.

Usable battery capacity (kWh)

State or territory

Installation date

Certificate (STC) price passed on ($)

Set by the installer after their costs. $37 is a typical figure; your quote shows the real one.

Estimated federal discount

$3,367

91 certificates: 13.5 eligible kWh x factor 6.8 (1 May to 31 Dec 2026).

Plus a NSW payment for joining a VPP, set by the VPP provider.

The same battery installed in the next period (1 Jan to 30 Jun 2027) would get about $2,812.

Formula from the Clean Energy Regulator: first 14 kWh at the full factor, 14 to 28 kWh at 60%, 28 to 50 kWh at 15%. It does not vary by postcode. Estimate only; the installer's quote is the real figure.

Want a real quote with the discount applied?

Green, our battery partner, quotes with the federal discount (and any state incentive) taken off the price. Free, no obligation.

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Common questions

How do I calculate my battery rebate?: Take the usable capacity in kWh. The first 14 kWh counts in full, 14 to 28 kWh at 60%, and 28 to 50 kWh at 15%. Multiply by the STC factor for your installation date and round down to whole certificates, then multiply by the certificate price your installer passes on.
Does the battery rebate depend on where I live?: The federal discount does not: it is the same in every state and postcode. State extras do differ, with Western Australia paying the most.

Battery rebates by state

Reviewed by James Baker, Founder, EnergyPlans.com.au. Data last verified 11 November 2026. Methodology.