The aim of our report is to refer on the actual state of small biogas power plants
in Hungary summarising the increase in their number and capacity and their effects
on climatic change. The above is based on the CO 2 emission of the energetic utilization
of biogas and the calculation of its ecological footprint that were compared to the
environmental effects of natural gas energetic utilization. The aim of this paper
does not include the complete life cycle analysis therefore the environmental benefits
of the energetic utilization of biogas produced from various raw material are presented
via only the direct CO 2 emission of the production process.