To the best of our knowledge, there are no exergetic studies of an ethanol organosolv process for EFB from Malaysia or Indonesia that have considered all main processing steps, including the boiler unit. However, the fundamental workflow across these works is similar. To describe the exergy of a chemical process, we can differentiate between exergy related to matter flow and exergy which is not related to matter flow. The latter is thermal exergy (𝐸𝑥 ! ) as a result of thermal energy transfer and work here described as shaft work (𝐸𝑥 " ! ).