GAF Energy is forwarding the solar tile envelope with the development of a nailable solar shingle they are calling the Timberline Solar Energy Shingle. The shingle is about 64×17 inches, and the solar portion measures 60×7.5 inches. It’s the extra non-solar portion made up of TPO roofing material that is nailed to a roof. Other companies making strides is this area are CertainTEED and SunTegra.