The STC rebate is an upfront discount linked to Small-scale Technology Certificates under Australia’s federal Small-scale Renewable Energy Scheme. Eligible solar systems can create STCs, with the number generally affected by the system’s size, location and installation date, while their market value can change. Most installers assign the certificates to themselves and include the estimated discount in your quote, rather than paying you a separate rebate. Check the Clean Energy Regulator’s guidance and ask your installer how the calculation applies to your system, as eligibility and the final discount are not guaranteed.