The corrugated medium and linerboard board are made of kraft containerboard, a paperboard material usually over 0.01 inches (0.25 mm) thick.
The panels contain cells made in China, Taiwan and, sometimes, Germany. Grape still plans to import inexpensive Chinese-made cells, and to buy Oregon-made inverters -- which convert direct current to alternating current -- for the panels it assembles in Eugene.
Currently, the largest solar panel farm in the world is Huanghe Hydropower Golmud Solar Park, located in China. The solar farm produces roughly 200 MW per day. There is currently a 550 MW solar farm (The Desert Sunlight Project) under construction in Riverside County, California.