Anaerobic digestion is a process of decomposition of organic material in the absence of oxygen. During anaerobic fermentation of organic matter, the feedstock material breaks and degrades; in the meanwhile, different bacteria populations generate biogas. The produced biogas is in general a mixture of mostly methane, carbon dioxide, nitrogen, hydrogen, oxygen, and water vapor. The high concentration of methane in biogas indicates its potential to be injected into existing gas grids thanks to equipment for biogas purification and upgrading technology.

Anaerobic digestion is the process through which organic matter is broken down in an oxygen-free environment to create biogas. Therefore, biogas is created by food waste, wastewater, animal manure, and various other organic wastes and is used to generate electricity and to provide heat.

When organic waste arrives at the plant, it is pre-treated and mixed with liquid waste to create a slurry. Then, it is fed into the digestion tank where there is no oxygen. Bacteria within this slurry eat organic matter. As they eat and break down organic matter, they create biogas (methane, carbon dioxide, and other gases). Gas flows at the top of the tank and is captured to create electricity and heat. Methane can also be cleaned up and used as vehicle fuel. The remaining slurry can be collected to act as manure for plants.