Commercial rooftop solar refers to photovoltaic systems installed on business-owned buildings to generate electricity where it's consumed. Flat Roof Dominance Creates Massive Opportunity: With flat roofs representing approximately 80% of commercial roof area in the United States, ballasted mounting systems have become the preferred solution, offering installation costs as low as $2. However, as governments push to reduce dependency on fossil fuels and reduce the carbon footprint, more states are writing legislation to. A rooftop commercial solar energy system is a smart investment for many businesses. By generating your own energy it not only saves money but it also protects your organization against future energy rate hikes. While they can provide significant financial, environmental and reputational benefits, they can also present various risks, such as fire and.