This study examined the torrefaction performance of Jatropha-seed residue after mechanical screw-press extraction of oil (denoted as JME) at fixed torrefaction temperature (T-r) of 533, 553 and 573 K in the torrefaction time (t(r)) range of 10-60 min. The characteristics results of torrefied JME (JME(T)) indicated that the mass yield decreases while dry-basis high heating value (H-HD) increases with increasing T-r and t(r). At t(r) = 20 min or longer and T-r of 533-573 K, the H-HD of obtained JME(T) is suitable for B1/B2/D Taiwan power industry fuel requirement. In addition, the FIX and O/C atomic ratios of JME(T) are better (i.e., lower) than those of torrefied wood and close to those of lignite and sub-bituminous coal. The satisfactory energy densification (E-D) of about 1.3 can be achieved for Case 1 at higher T-r of 573 K and shorter t(r) of 30 min with log severity factor (logSF) of 7.37 or Case 2 at lower T-r of 553 K and longer t(r) of 50 min with logSF of 7.00. The results indicated that Case 2 exhibits a lower value of SF than Case 1 at the same level of satisfactory E-D, which is more beneficial for the torrefaction of JME. (C) 2017 Published by Elsevier Ltd.