We like solar power as a sustainability concept. Solar panel prices are falling while demand for electricity is high in the Global South. Solar panels are not hard to install or maintain. Global South fields can do business selling solar panels and installation services.
GSI's Innovation Award 2017 was won by OM Ukraine for its solar project. Panels are installed on buildings, including churches, with the goal of selling electricity to the grid.
On a smaller scale, Global South OM-ers can run small businesses operating solar-powered mobile charging stations (http://www.a-r-e-d.com), renting solar kits for home use (http://offgrid-electric.com), or running bakeries using solar-powered ovens (https://www.sunoven.com). This combination of profitability, easy operation, providing a valuable service to the community, and creating many opportunities for interaction with the local community, is what we like to see in a GSI project!