Anaerobic digestion of agricultural residues generates biogas which can be used directly for lighting, cooking, electricity generation, or to power an IC engine for water pumping or milling. The remaining sludge forms a good fertilizer.

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Quote text and notes from Wikiquote: Caroline Langat Thoruwa (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.