A new solar roofing product from one of the country’s largest roofing companies aims to drive down the costs of home solar energy installations and boost the overall use of solar technology. Solar power expert Zachary Holman, a Fulton Schools associate professor of electrical and energy engineering, says the company, GAF Energy, seems to have all the technical aspects of its operations in place, and that with a good supply chain and business management operations the company could be in position to achieve its goals. Still, Holman and other renewable energy experts say there may be some challenges involved in the installation, operation, efficiency and resilience of this new kind of solar system under various conditions.