Lêbonê Project: Lighting Africa with Off-Grid Energy
In partnership with Harvard University/Lêbonê Solutions, Professor David Edwards, Huga Van Vuuren, Ralph Borland & Richard Kirk

They can produce electricity from soil, using microbial fuel cell technology. Overnight, they were able to produce at least 5V.

This project would complement the Kennedy Violich Portable Light Project (more info here).