NOVELTY - Producing biogas, comprises providing a slurry comprising a bagasse-derived material and water, and e.g. either (a) performing a pre-treatment comprising adding at least one enzyme to the slurry to degrade the bagasse-derived material at a suitable temperature and pH, and then adding the enzyme-degraded material to a biogas digester tank at a suitable rate and ratio to effectively convert the material to biogas in the digester, or (b) adding at least one enzyme to the slurry before adding the slurry to a biogas digester tank.    USE - The process is useful for producing biogas (claimed), preferably methane.    ADVANTAGE - The process: exhibits increased methane production when compared with untreated bagasse, higher conversion rate in the biogas digester tank, higher productivity per unit of volume in the digester tank, lower investment in tank capacity, higher gas production per tank volume, more efficient conversion of the bagasse-derived material at higher dry matter concentration, reduced amounts of unconverted material in the purge, and higher dry matter content in the unconverted solids; avoids post-converter or storage tank; and exhibits easier dewatering of unconverted material and easier cleaning of the gas phase.    DETAILED DESCRIPTION - Producing biogas, comprises providing a slurry comprising a bagasse-derived material and water, and either (a) performing a pre-treatment comprising adding at least one enzyme to the slurry to degrade the bagasse-derived material at a suitable temperature and pH, and then adding the enzyme-degraded material to a biogas digester tank at a suitable rate and ratio to effectively convert the material to biogas in the digester, or (b) adding at least one enzyme to the slurry before adding the slurry to a biogas digester tank, or (c) adding at least one enzyme to the digester tank after adding the slurry to the digester tank, to degrade the bagasse-derived material at a suitable temperature and pH and to effectively convert the material to biogas in the digester.