There is no single business solar rebate. There are certificate schemes that depend on size and install date, plus state and tax considerations.
Up to 100 kW: STCs
A business installing a system of 100 kW or less qualifies for STCs on the same basis as a home. The count is capacity times zone rating times deeming period. For a 2026 install the deeming period is five years, with zones rated 1.622, 1.536, 1.382 and 1.185. At roughly $38 to $40 per STC at the time of writing, a 30 kW system in zone 3 would create about 207 STCs, worth in the order of $8,000.
The deeming period shortens to four years for 2027 installs and keeps falling to the end of the scheme on 31 December 2030, so the timing of the project matters. See what changes in January.
100 kW to 1 MW: STCs from 1 October 2026
Solar above 100 kW and up to 1 MW installed from 1 October 2026 creates STCs with a fixed five-year deeming period, so a 300 kW system in zone 3 would create about 2,073 STCs. The Clean Energy Regulator says applications open mid to late November 2026. See mid-scale solar STCs.
Above 1 MW, and older large systems: LGCs
Above 1 MW, or for systems above 100 kW installed before 1 October 2026, the owner accredits a power station and creates LGCs, one per MWh. See commercial solar above 100 kW.
Other things to check
- State programs. Victoria, NSW and others run energy efficiency schemes and, at times, grants for businesses. These change often and have their own eligibility.
- Tax. Depreciation and instant asset write-off rules can apply. Ask your accountant, and see the ATO.
- Power purchase agreements. If a third party owns the system, the certificates may belong to them.
What to ask an adviser
Before committing, ask your accountant three questions: how is the system depreciated, does any instant write-off or similar provision apply this year, and how should the STC discount be treated in my accounts. Ask your installer whether the quote is based on 2026 deeming, and what changes if the install slips into January. Together those answers will tell you more about the real cost of the system than the headline price will.
What this means for you
Compare quotes on the net price after STCs, and ask which certificate the system will create, and when the claim can be lodged for anything above 100 kW. For the certificate side, see how to create LGCs, the STC trading page and the resources hub. Installers can see today’s rates on the pricing page.