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.
While solar panels on home roof tops are the most emblematic form of solar, the majority of the world's solar power is coming from these large solar panel farms built in remote regions. The farms sell power to utilities or even big companies like Apple (aapl).