Deep drying and torrefaction is a thermal pretreatment method, where biomass is heated in the temperature range of 150?300�C in an inert or reduced environment. The process parameters like temperature and residence time has a significant impact on proximate, ultimate, and energy properties of the biomass. In the present study, torrrefaction experiments were conducted on 2 mm lodgepole pine grind using a thermogravimetric analyzer. Both deep drying and torrefaction temperature (160?270�C) and time (15?120 min) were selected. Torrefied samples were analyzed for proximate, ultimate and energy properties. Results indicated that moisture content decreased with increases in torrefaction temperature and time, where at 270�C and 120 min, the moisture content was found to be 1.15% (w.b.). Volatile content in the biomass decreased from about 80% to about 45%, and ash content increased from 0.77 to about 1.91% at 270�C and 120 min. The hydrogen, oxygen and sulfur content decreased to 3%, 28.24%, and 0.01 whereas carbon content and higher heating value increased to 68.86% and 23.67 MJ/kg at 270�C and 120 min. H/C and O/C ratio calculated at 270�C and 120 min residence time were about 0.56 and 0.47. This study indicated that higher torrefaction temperatures >
230�C and residence time >
15 min influenced the proximate, ultimate, and energy properties.