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Methane slippage underestimated in ETS draft methodology

In August, the European Commission published draft regulations setting on the methodology to report emissions of methane and nitrous oxide from shipping, with reference to the revised emissions trading system (ETS). “Slippage coefficients” are used to calculate the amount of LNG fuel that is not burned but released into the atmosphere. It would also be possible to provide emission data based on laboratory testing.

Transport & Environment is (T&E), however, is critical to these default values, which are said to “grossly underestimate methane slippage”, according to a recent article in ENDS Europe. “The default values should be updated to take into account research that shows methane slip is considerably higher than the current default values,”, says T&E. The criticism also concerns the option to provide emissions values based on laboratory testing until a test cycle that “reflects real-world operational conditions (notably, the engine loads and their weightings)” is available. The NOx test cycle (NTC) of the IMO assumes a 75 per cent engine load more than 70 per cent of the time, but according to research cited by T&E, most ships operate on average at a lower engine load, resulting in higher methane slippage. “Relying on the NTC risks turning a blind eye to a significant amount of emissions,” according to T&E.

Ends Europe, 24 August 2023. Shipping emission rules risk new ‘dieselgate’, green group warns. https://www.endseurope.com/article/1835085/shipping-emission-rules-risk-...

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