Revitalization of abandoned agricultures lands presents one of the main problems of the Croatian agriculture. One of the possible solution could be the introduction of multiannual energy crop Miscanthus x giganteus in intensive agriculturel production. The said culture is characterized by the possibility of the growing in different agroecological conditions, low requirements during the growing and high yield production lignocellulosic biomass. Since that the said culture shows satisfact yields on soils of lower quality, by introduction of grass Miscanthus x giganteus would not affect the current agricultural production in Croatia and the production of food for humans and animals. The main characteristics of grass Miscanthus x giganteus are: the possibility of growing on soils of lower quality, high resistance to various pests and diseases (no pesticide treatments), natural sterile hybrid, small requirements for fertilizer, but high energy value (from 17.05 to 19.21 MJ/kg).The aim of this study is to determine the possibility of the introduction of energy crops (to znaći usjev) Miscanthus x gigateus on currently abandoned agricultural lands in Croatia with their revitalization goal for the needs of energy production. Based on the data obtained will be determined by the the amount of potentially available biomass obtained by cultivation of Miscanthus x gigateus on such soils and quantitative amounts of the most important biofuel that can get its processing. the methods of their production will be shown, using anaerobic fermentation (biogas) and sugars fermentation using yeast (ethanol) and it will determine the energy potential of reaserched biofuels based on a 5%, 10% and 15% of the potentially available surface, now abandoned.