The methane potential of forest residues was compared after applying organic solvent, i.e., acetic acid, ethanol, and methanol pretreatments using batch anaerobic digestion (AD). The pretreatments were performed at 190°C with 50% (V/V) organic solvent for 60min. The accumulated methane yields after 40days of AD from pretreated forest residues were between 0.23 and 0.34m3 CH4/kg VS, which shows a significant improvement compared to 0.05m3 CH4/kg VS, from untreated forest residues. These improvements count up to 50% increase in the methane yields from the pretreated substrates based on expected theoretical yield from carbohydrates. Among the organic solvents, pretreatments with acetic acid and ethanol led to highest methane yields, i.e., over 0.30m3 CH4/kg VS. However, techno-economical evaluation showed, pretreatment with methanol was more viable financially. The capital investments of the plant operating 20,000tons of forest residues varied between 56 and 60 million USD, which could be recovered in less than 8years of operation.