Julienne Mukelenge no longer worries about toxic fumes or power cuts when cooking at her home in Goma, in the eastern Democratic Republic of Congo, after switching to biogas, a renewable energy source that is cheaper and locally produced.
"Electricity is expensive, but with biogas it's very economical," she said, standing in her kitchen, where blue flames licked the sides of a bubbling pot of that night's supper.
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