Typical and default values – biogas for electricity – mixtures of manure and maize: greenhouse gas emissions with shares given on a fresh mass basis

Biogas production system Technological options Greenhouse gas emissions – typical value (g CO_(2)eq/MJ) Greenhouse gas emissions – default value (g CO_(2)eq/MJ) Manure – Maize 80 % - 20 % Case 1 Open digestate 17 33 Close digestate – 12 – 9 Case 2 Open digestate 22 40 Close digestate – 7 – 2 Case 3 Open digestate 23 43 Close digestate – 9 – 4 Manure – Maize 70 % - 30 % Case 1 Open digestate 24 37 Close digestate 0 3 Case 2 Open digestate 29 45 Close digestate 4 10 Case 3 Open digestate 31 48 Close digestate 4 10 Manure – Maize 60 % - 40 % Case 1 Open digestate 28 40 Close digestate 7 11 Case 2 Open digestate 33 47 Close digestate 12 18 Case 3 Open digestate 36 52 Close digestate 12 18 Comments Case 1 refers to pathways in which electricity and heat required in the process are supplied by the CHP engine itself. Case 2 refers to pathways in which the electricity required in the process is taken from the grid and the process heat is supplied by the CHP engine itself. In some Member States, operators are not allowed to claim the gross production for subsidies and case 1 is the more likely configuration. Case 3 refers to pathways in which the electricity required in the process is taken from the grid and the process heat is supplied by a biogas boiler. This case applies to some installations in which the CHP engine is not on-site and biogas is sold (but not upgraded to biomethane).

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Source: EUR-Lex (Cellar) · retrieved 2026-10-28 · Text as adopted (Official Journal); later amendments are not incorporated in this text.