Project started in 2003 Since 2003 coffee and cacao farmers of Oaxaca and Chiapas have used the Helios technology to roast their grains, permitting them to sell at a higher price than if they sold raw. They can also now purify water and cook without burning any wood. Based on the Hélios prototype, it was the motivation of the Oaxacan community along with a few Canadians who developed the idea of spreading the technique freely. The Mexicans called these contraptions "Fuego Solar". It (...)