Commercial solar uses rooftop or ground-mounted panels to generate electricity for a business, usually reducing the amount bought from the grid during operating hours. Excess generation may be exported, although the value depends on the electricity retailer, network rules and contract. System size, installation cost and potential savings depend on the site’s energy use, roof, local network requirements and tariff, so payback periods vary and are not guaranteed. A qualified solar installer can assess the property, while an accountant can explain any relevant tax or depreciation treatment.