Sewage Sludge Gas
European Commission - Eurostat

International Energy Agency (IEA)
Produced from the anaerobic fermentation of sewage sludge. The quantity of fuel used should be on a net calorific value basis.

United Nations Economic Commission for Europe (UNECE)
Produced from the anaerobic fermentation of sewage sludge. The quantity of fuel used should be on a net calorific value basis.