Bachelor thesis is focused on effectiveness of targeted cultivation of selected species of grasses for energy purposes (Dactylis glomerata, Arrhenatherum elatius, Phalaris arundinacea). Work compares yields and suitability of selected species of grass growing for energy recovery. Furthermore, for each species of grass evaluates the best date harvesting for energy use direct combustion and biogasification based on the percentage of dry matter and the annual yield of dry matter. Input data used derived from experimentally observed data in the research field plots of perennial plants. Part of the thesis is to summarize the literature about other types of energy crops (Miscanthus sinensis Anderss, Rumex patientia, Populus L.,Zea mays)and compare with them the suitability grasses for growing to energy recovery on the basis of selected production capacity and energy parameters (dry matter yield, energy recovery, heat of combustion).