GlobalResolve: Development of the Twig Light

Arizona State University, 2009 - $16,000

GlobalResolve (GR) is a program at Arizona State that starts village-based ventures in developing countries by introducing sustainable technologies that address economic and health issues. One of those technologies is the Twig Light, a low-cost, sustainable light source. It consists of a wafer-type thermoelectric generator sandwiched between the upper and lower portions of a small box. The upper section is a small combustion chamber in which the user puts small pieces of wood (twigs) to be burned. The lower section sits on the ground or in a few centimeters of water. When the burning wood heats the upper chamber, the temperature difference between the two sections powers the thermoelectric generator, which powers the lights.

An alpha prototype has been developed and tested. With NCIIA funding the team will refine the Twig Light design, test it again, and distribute twenty prototypes to villages in Malawi and Ghana where they’ve worked previously. After a year of field testing they’ll interview villagers about the light, develop a final design, and establish manufacturing capability and supply chains in Malawi and Ghana.


In 2010, the Twig Light team established a company, Daylight Solutions, LLC.   Ghanaian partners include one company (Amstar Inc.), an NGO (The Center for Energy, Environment and Sustainable Development, CEESD) and Nana Afaokwa, the paramount chief of the Domeabra region in Ghana.

The students in Ghana have formed an NGO (The Center for Energy, Environment and Sustainable Development, CEESD)

The project is moving from the research phase into a venture with the Ghanaian partners. The first 100 commercial prototypes will be manufactured in the US to perfect the process, possibly this year, in a manufacturing cell consisting of micro-CNC equipment. This cell will either be shipped to Ghana or replicated in that country. The initial manufacturing location will be in Domeabra, a village near Kumasi. Plans are to expand to Cameroon and Kenya in a year.

Story about Twiglight

Engineering for Change (Nov 2010)