Olive leaves (OL) were obtained from an olive oil production plant in February 2012 with a moisture content of 24.4% (w.b.), prunings (leaves and small branches) (OP) were harvested as a whole in March 2012 with a moisture content of 26.7% (w.b.) and olive wood (OW) was collected as logs in March 2012 with a moisture content of 23.2% (w.b.). The biomass was stored for 3 months uncovered, until its moisture content decreased to approximately 15% (w.b.).