||Currently, biomass is recognized as an important renewable energy source and contributes to approximately 10% of the global energy consumption. Torrified bioamss shows similar characteristic those of coal. Therefore, Torrified biomass can be co-combusted with coal. This paper aims to integrate torrefaction process with a CHP(Combined Heat and Power) plant and perform a case study to replace 25%, 50%, 75%, 100% of the fossil fuel in boiler. Also, a heat integration is purposed by using the used steam in the CHP plant as a heat source for torrefaction reactor and driyer. From these, we calculate energy efficiency of the integrated process, and determine whether the torrefied biomass can replace fossil fuel 100%.