There are five basic categories of material of biomass such as:br •Virgin wood- from forestry, arboriculture activities or from wood processing.br •Energy crops- high yield crops grown specifically for energy applicationsbr •Agricultural residues- residues from agriculture harvesting or processingbr • Food waste- from food and drink manufacture, preparation and processing, andbr post-consumer wastebr •Industrial waste and co-products- from manufacturing and industrial processes.