Biogas provides renewable energy
Biogas is a gaseous fuel that is produced when organic material breaks down anaerobically (in the absence of oxygen). This process yields a renewable energy source that consists mainly of methane, carbon dioxide and nitrogen.
Biogas is produced, for example, when household food waste or farm slurry is broken down by microorganisms, or when sludge undergoes a digestion process in a water treatment plant. Biogas can also be extracted from landfill sites, where organic waste has previously been deposited.
Common applications for biogas are as a fuel for vehicles or for generating electricity or heat. Biogas can be mixed with natural gas and used in the same distribution system, which gives it a logistical advantage. Biogas can also be used in small local plants, but is still more common at landfill sites, where its use offers greater environmental and financial benefits.