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Energy sources have become the focus of legal and ethical debate, mainly due to increased environmental challenges and socio-economic change. Non-renewable energy sources are thus increasingly being replaced by renewable ones. The agriculture sector is also targeting less polluting technologies for ensuring sustainability aiming to harness equitable, viable solutions for both agricultural businesses and the world within which they operate.. This study analyses a case of waste to energy, within the State of Rio Grande do Sul, Brazil, where two small rural pig farmers assessed production cycles and waste generated in order to exploit new opportunities for organizational cost reduction and energy selfsufficiency. Pig waste acts as biomass for each digester installed in the farming properties. These digesters produce enough power to maintain a central biogas generation unit, and thus providing animals heating and drying of the grain produced in the respective properties. Biofertilizer produced by digesters can, furthermore, help fertilize corn crops and cattle grazing. The findings of our study demonstrate that investment into such a project can provide an excellent return, with savings up to 50% in electric energy and 50 % in fertilizer. Cost saving was also recorded in the overall production.

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