High yielding tropical energy crops for bioenergy production: Effects of plant components, harvest years and locations on biomass composition.

•Biomass composition of plant parts of two tropical energy crops were analyzed.•Composition varied significantly between crop type and plant parts within crop type.•Energycane leaves were higher in ash and fiber content than stems.•Napier grass leaves were less in fiber content than stems.•Crop composition varied with locations and harvest years/seasons.