Fuente: WIPO "organic farming" The present invention relates to provide a sustainable system using cows/cattle asa solution to energy production and storage and includes the sustainable cattleshelters, usage of biogas to produce DC electricity during night time and PVpanels during day time and slurry as organic manure for organic farming. Thesystem, is divided into three main parts: l)"Sustainable and energy efficient cattleshed (portable) and cattle farms. 2) Biogas as source of energy producing directcurrent using biogas gensets or producing Hydrogen for fuel cells and 3) Use ofslurry as organic manure and promoting organic farming.