Biomethane fueling CHP units represent an alternative in the use of biogas. Biomethane, obtained from the organic materials such as agricultural residues, landfill gas or organic waste, is used as a fuel for the CHP units after its thorough purification. They can burn the gas efficiently to produce the power and heat with low CO2 emissions. Biomethane is thus a valuable renewable energy source, the use of which minimizes the environmental impact of the production process of heat and power.