For commercial solar in 2026, start by reviewing your site’s electricity use, network export limits, roof condition and available space, rather than sizing a system from annual usage alone. A business may also compare solar with battery storage, demand management and controlled energy use to improve the value of its investment. Possible incentives, including certificates, grants, tax treatment and financing options, depend on system size, location, business structure and current government rules, so check energy.gov.au and the Australian Taxation Office. A qualified installer and accountant can assess the design, approvals, expected savings and tax position for your circumstances.