Biogas Usage :

  Biogas  can  be  used  for  many purposes, mainly cooking and 
  lighting in rural areas. It can be  burned  with a gas mantle 
  or be  converted  to  electricity using dual mode engine. The 
  per  capita  requirement  of  gas for cooking is in the range 
  0.34-0.43 m3/day (efficiency of standard burner is about 60%). 
  The gas requirement to generate one unit of electricity (kWh) 
  is  about 0.54 m3. The  calorific value of m3 of gas is about 
  4713 kcals.