FAQs

Similar to those for medium biomass plants.

Chapter 5 of the government’s RHI announcement says

Biogas combustion

Our approach for biogas combustion under 200kWth capacity applies similar principles to those used in the enforcement of small-scale biomass combustion and combustion of solid biomass from municipal solid waste:

• The tariff paid will not be adjusted for any ancillary fossil fuel used during combustion, although participants will be subject to a 10 per cent cap on this fuel as a condition of eligibility and also asked to retain information on the amounts used for audit purposes. This approach reflects the principles applied to the enforcement of small-scale biomass combustion.
• Where biogas produced from advanced conversion technologies such as gasification and pyrolysis is combusted, the tariff paid will be adjusted to reward only the biomass proportion of the feedstock used. This approach is similar to that taken on solid biomass contained in municipal solid waste.

For biogas produced from both AD and advanced conversion technologies, the eligible heat output will be reduced for any heat from an external source or which is returned to the process to heat the digester, gasifier or pyrolysis chamber.