This paper describes in detail the processes of anaerobic digestion, the used substrates andthe conditions needed for a better implementation of the chemical process, the way of obtainingbiogas and the techniques of upgrading the quality of biogas. Moreover, it describes a typicalbiogas facility and all its parts, way of working and the purpose of its each characteristicconstituent. It also explains the problems and legal conditions of connecting the power plant to thegrid. The concept of reliability of the biogas facility and the typical methods of calculating thereliability are also explained. With the help of the technical characteristics of the facility and thedescription of the failures, an analysis of biogas facilitys work has been done. It has been shownthat the greatest impact on failures of the biogas facility has the instability of the distributionsection of the power system.