Dear colleagues I want to write a review paper entitled" The potential use of biogas to meet electrical and thermal loads of building" please anyone wants distribution to inform me.to 1-Introduction 2-Evaluation the use of biogas in different parts of the world 3-Different usages of biogas 4-Recent progress in biogas production 5-Biogas fueled electrical power production systems 1-5-Micro gas turbine 2-5-Fuel cell 3-5-IC engine 6-Energy analysis of biogas fueled system 7-Exergy analysis of biogas fueled system 8-Economic analysis of biogas fueled system 9-Conclusion