In 2026, the federal Small-scale Renewable Energy Scheme generally applies to eligible solar PV systems up to 100 kW, subject to equipment, installer and other program requirements. The discount is based on Small-scale Technology Certificates (STCs), which are calculated using your system’s capacity, location, installation date and the certificate market price; the 2026 deeming period is five years. Your installer may include an estimated STC value in the quote, but the final outcome depends on the scheme rules and certificate price. Check the Clean Energy Regulator and your state or territory government for current requirements and any additional rebates.