Digesters processing dedicated energy crops can achieve high levels of degradation and biogas production. Gaseous biofuels include biogas, landfill gas and synthetic gas. These organisms promote a number of chemical processes in converting the biomass to biogas. Sewage can be converted to biogas using anaerobic digestion. Technologies are being developed to use enzymes to transform bagasse into advanced biofuel and biogas. Maize is widely used in Germany as a feedstock for biogas plants. Strategies include using biogas from manure. Electricity production by biogas and hydro power can follow the energy demand. Gas from sewage and landfill (biogas) has already been exploited in some areas. Rejected organic solids from biogas plants can be used in coal plants after torrefaction. India has had a long involvement with anaerobic digestion and biogas technologies. The air pollution produced by biogas is similar to that of natural gas. Indian kitchens are also supported by biogas and solar energy as fuel. This seems to be the earliest developments in generating biogas from agricultural waste. The combustion of this biogas has very little odour or smoke.