This article summarizes the technical characteristics of a biomass pyrolysis pilot plant recently constructed in central Greece. It highlights the considerations involved in achieving successful pyrolysis technology and environmental and developmental goals, by reviewing technical and nontechnical barriers associated with biomass treatment technology in Greece. Data from the start-up phase of the plant operation are presented and some aspects of the process are outlined. The capacity of the plant is 1200-1450 kg / hr, based on wet biomass (Arbutus Unedo) and the pyrolysis temperature is approximately 400 degrees C. Char yield is 14-18% weight on dry basis and is of good quality consisting of 76% C with heat content 6760 kcal / kg. Bio-oil includes 63% C and its heat content is 6250 kcal / kg.