The subsidy is national, applied at the point of sale, and invisible to the householder — the installer assigns the certificates and the discount appears in the quoted price. Measured against most schemes in this database, that is close to the ideal delivery mechanism: no application, no window, no reimbursement claim, no take-up gap.

The Cheaper Home Batteries Program extends it. From 1 July 2025 the SRES was extended to batteries of 5 to 100 kWh nominal capacity, delivering a discount of around 30 per cent, with installation by or supervised on site by an installer accredited by Solar Accreditation Australia.

And the taper is a design worth recording. From 1 May 2026 the certificate factor steps down with capacity — 100 per cent up to 14 kWh, 60 per cent between 14 and 28 kWh, and 15 per cent between 28 and 50 kWh — with support adjusted as battery costs fall, to hold the discount near 30 per cent across system sizes.

A subsidy that declines as the technology gets cheaper, and pays proportionally less for capacity beyond what a household typically uses, is the graduated design this site argued for in other payment settings.