IEA Bioenergy Task 37 – Energy from Biogas

The upgrading process of biogas to Biomethane results in a gas stream containing (bio-) methane and a second gas
stream containing the CO2 and an unwanted part of the biomethane, called methane slip. This CO2 rich gas stream
either directly emitted to the atmosphere or its content of methane is oxidised before the release into the
atmosphere, according to the applicable regulations. National regulations on the handling of the methane slip
differ substantially in EU countries, France has recently changed the thresholds, in Switzerland new regulations are
discussed. The presentations address the options for the reduction of the emissions and put the options for emission
reduction into a context with GHG balances and national situation in Switzerland and France.