Landscape of Danube inland-delta and its potential of poplar bioenergy production

► We report the possibilities of I-214 and Robusta clones using for bioenergy purposes. ► We examine HHV in the level of clone, biomass fraction and the location on the tree. ► Wood and small-wood with bark have the highest average HHV of 18.43 MJ kg−1. ► The lowest average HHV value of 17.84 MJ kg−1 is found for bark at the stem base.