ABSTRACT Sago bark has potential as an alternative raw material for environmentally friendly bioenergy, with the potential bio-pellets from sago bark capable of producing a calorific value of around 4,855 kcal/kg, thus meeting the biomass pellet standard for energy. This study aims to analyze the effect of co-firing variation of sago bark biomass pellets based on SNI 8951:2020, to assess t…