The STC rebate does not have a fixed value: its impact depends on your system size, location, installation date and the market value of Small-scale Technology Certificates. Installers commonly claim the certificates and show the estimated discount in your quote, so you may not pay a separate upfront amount, but the discount can vary between providers. Ask for the system price before and after the STC deduction, and check eligibility with an accredited installer. For current rules, refer to the Clean Energy Regulator’s official website.