Applications for Evergreen's solar cells and systems include highway call boxes, microwave stations, street and billboard lighting and off-grid ruralelectrification.
Especially useful is the chapter about the RuralElectrification Administration, which brought cheap power to rural farm areas in the south, stimulating these economic areas.
Expanding rural road networks (in addition to investing in electrification and irrigation) is a strategic investment for rural development and should not be judged against narrowly defined economic criteria.