Methods of calculating greenhouse gas emissions
This document sets out the methodologies for calculating greenhouse gas emissions associated with the production of biomethane.
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This document sets out the ‘actual value method’ and ‘default value method’ for calculating lifecycle greenhouse gas emissions associated with the production of biomethane from biogas for the Green Gas Support Scheme.
Updates
15 February 2024
We made the following changes to the document:
- Adding subscript ‘a’ to the ‘Fuel feedstock factor’ definition in Part B, Section 1, on p.4.
- Removing subscript ‘t’ from the ‘total emissions from the fossil fuel comparator’ equation variable in Part B, Section 2, on p.4.
- Inserting a decimal point to correct a typographical error by changing 3,664 to 3.664 in Part B, Section 6 (and Footnote 3).
- Adding typical and default values for ‘Close digestate, no off-gas combustion’ and ‘Close digestate, off-gas combustion’ for ‘Biomethane from biowaste’ production systems in Part C, Table 1, p.8. This reflects data from the equivalent table in REDII, Annex VI, D, Table ‘Typical and default values for biomethane’.
25 May 2022
First equation on p.3 updated to reflect the 2020 Corrigendum OJ L311 of RED II.
Last updated 15 February 2024 + show all updates
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Document updated: revisions listed in the Details section of the page.
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We have updated the first equation on p.3 to reflect the 2020 Corrigendum OJ L311 of RED II.
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Final version of guidance published, alongside launch of the Green Gas Support Scheme (GGSS).
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First published.