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.
Solar power in the People's Republic of China is one of the biggest industries in mainland China. In 2007 China produced 1700 MW of solar panels, nearly half of the world production of 3800 MW, although 99% was exported.