Rows of solar panels line hillsides in Ruicheng county, Yuncheng, Shanxi province, July 5. Constructed by State Grid Shanxi Electric Power Co and Shanxi Electric Power Engineering Co, the photovoltaic base in Ruicheng county covers an area of over 2,666 hectares and has attracted total investment of 8.8 billion yuan ($1.38 billion). [Photo/Xinhua]