Biogas

Biogas is produced by the fermentation of organic substances, which can also serve as renewable energy sources. It falls under the category of renewable energy, because it is largely made of renewable materials. Biogas is actually a mixture of gases, largely carbon dioxide (CO2) and methane. The most valuable component of biogas is methane gas, which is included with about 60%. The higher this percentage is, the more energy is contained in the biogas.

Source: GREEN EFFORTS White Paper#11, Biogas in Ports and on Terminals; Schillmann, Jörn: schillmann.medien. www.energiespartipps.de