Darwin households may be eligible for the federal Small-scale Renewable Energy Scheme, which provides Small-scale Technology Certificates (STCs) for eligible solar systems installed by an accredited installer. The value is not a fixed rebate: it depends on the system size, installation date, Darwin’s postcode zone, the remaining deeming period and the certificate market price. Most installers assign the STCs to an agent and include the estimated value as an upfront discount, but the final amount and eligibility should be confirmed in your quote. Check current requirements at energy.gov.au and ask an accredited installer about any Northern Territory schemes.