The federal government will expand commercial solar rebates from October 1, cutting upfront installation costs by up to 20% for eligible businesses. A major solar rebate is coming for businesses. For the majority of commercial buildings, the 100-kilowatt cap barely scratched the surface of their available roof space. Many of these facilities consume most of their electricity during daylight hours, making solar particularly effective in reducing power costs. If you’re being asked to sign an installation contract in the next few weeks, that last one matters a great deal.