ST. LOUIS--(BUSINESS WIRE)--IKEA, the world’s leading home furnishings retailer, today announced the installing of solar panels is complete atop its St. Louis store opening September 30, 2015. Once the other components are mounted, connected and operational, the project will be the largest rooftop solar installation in the State of Missouri. The store’s 259,000-square-foot solar array comprises a 1.28-MW system, built with 4,085 panels, and will produce approximately 1,780,000 kWh of electricit