Homeowners should review their electricity usage, roof space, shading, roof condition and available budget before choosing a solar system. A Clean Energy Council-accredited installer can assess the property and recommend an appropriately sized system, while comparing several written quotes can help reveal differences in equipment, warranties and installation costs. Small-scale Technology Certificate (STC) discounts may be available, but eligibility and the value applied to a quote depend on the system, location and current rules. Check the latest information on energy.gov.au and confirm any proposed changes with your installer and electricity retailer.