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Biogas is a mixture of gases produced by AD. Its major constituents are methane (CH4) at about 60% and carbon dioxide (CO2) at around 40% with other gases in trace amounts (mostly hydrogen sulphide and ammonia). The composition of the biogas depends on the type of feedstock and the type of AD. Biogas can be 'upgraded' to pure methane, often called biomethane, by removing the other gases.
The energy in biogas can be used in several ways:
- Heat production
- Electricity production
- Combined heat and power
- Transport fuel
- Injection in to the main electricity or gas grid
For more information on these options please read the pages listed under 'Biogas' on the right hand side of this page.
An overview of the energy balance of AD can be found on the Renewable Energy Association website.
You can view the National Grid's commitment to facilitating Renewable Gas into their network on their Sustainable Gas Group site.
This diagram shows the inputs and outputs of Anaerobic Digestion, including the uses for Biogas.
A map of operational on-farm and off-farm biogas plants in the UK is available here.
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