Another 20% is degraded forest, and 10% is unsuited for cropping (barren rock, snow cover, glaciers etc.). With an average lower heating value of 17 MJ per kilogram, this corresponds to 80 Mtoe (100 Mt) of energy, which can be converted in biomass power plants with an efficiency of around 30%. Assuming a load factor of 60%, this biomass can sustain 25 GW biomass power generation capacity. Sugar production residues represent the single most important category.