The Appropriate Technology Collaborative (ATC) is a nonprofit organization that designs affordable and sustainable technology solutions to meet basic human needs in developing countries. ATC focuses on designs that are energy efficient, promote health, create economic opportunities, and improve the environment. Some of ATC's award-winning designs include a solar-powered vaccine refrigerator for Nicaragua and Guatemala, a simple water disinfection system, and a solar LED replacement for kerosene lamps. ATC works with local partners and universities to develop and implement these projects.