Most rooftop solar systems installed by a reputable installer are eligible. If you want to be sure, work through the questions below. This page is the household view. For the installer view, see which solar systems are eligible for STCs.
Five checks
- Size. For a home or small business the system must be 100 kW or less, and generate under 250 MWh a year. Almost all homes sit far below that. Commercial systems above 100 kW and up to 1 MW installed from 1 October 2026 follow the mid-scale rules.
- Equipment. Panels and inverter must be new and on the Clean Energy Council’s approved lists on the install date.
- Installer. The installer must have held the right accreditation, and an electrical licence, at the time.
- Installation. It must meet the relevant Australian standards, with evidence such as photos and compliance certificates.
- Claim. STCs must be created within the allowed window after install.
Where to find the answers
Your quote, invoice and installation paperwork list the equipment and the installer. The assignment form shows you agreed to hand over the right to the certificates. The installer should be able to confirm that the STCs were created. If you are unsure, ask them.
What the discount looked like
If you assigned your STCs, you should have received a discount at purchase. At the time of writing a 6.6 kW system in zone 3 earns 45 STCs, worth roughly $1,700 to $1,800. If your invoice does not show a discount, ask why. See how much the rebate is for 6.6 kW.
Common reasons a system is not eligible
- Second-hand or unapproved panels or inverters.
- An unaccredited installer.
- A system that has been modified in a way that changes its rated capacity.
- A claim made too late.
From the desk: if you moved into a home with solar already installed, you cannot normally create STCs for it now. They belong to the original installation.
What this means for you
Keep your paperwork, check the installer’s details and ask for the STC count on your invoice. The resources hub and STC trading explain how the scheme works from the installer side, and do I qualify for the solar rebate covers eligibility for a new purchase.