Just south of Kona International Airport, a large mysterious group of buildings with an equally large and mysterious photovoltaic (solar) panel installation looks like some sort of top-secret military station. It's really the site of the Natural Energy Lab of Hawaii Authority, NELHA for short. Here, scientists, researchers, and entrepreneurs make use of a cold, deep-sea pipeline to develop and market everything from desalinated, mineral-rich drinking water and super-nutritious
algae products to energy-efficient air-conditioning systems and environmentally friendly aquaculture techniques. Three types of facility tours are offered most days.