Small-scale technology certificates (STCs) can reduce the upfront price of an eligible solar system, but the value depends on factors such as system size, location, installation date and the STC market price. Ask each installer to show the STC discount separately from the remaining system cost, and confirm who will create and assign the certificates. Check that the installer and products meet the scheme’s requirements, and be cautious of unusually large discounts or pressure to sign quickly. For current rules, use the Clean Energy Regulator’s information or ask a suitably accredited installer.