At the Bahariya Oasis 235 miles southwest of Cairo, the mountains of the Western Desert are interrupted by vast circular patterns of greenery. On one of these large farms, in striking contrast to the ancient, wind-shaped sandstone in the background, solar panels stand in neat rows. Here at the center of the largest hyper-arid region on earth, KarmSolar, a three-year-old Egyptian solar energy start-up company, has built its headquarters.