MEPC 83-7-28: Key considerations to determine the well-to-tank (WtT) emission factor for liquefied natural gas (LNG)
This document builds on document ISWG-GHG 17/3 (CSC) to complement the extensive literature review on the well-to-tank (WtT) GHG intensity of liquified natural gas (LNG) imports in the European Union, including information and literature to determine a WtT value for a global default emission factor. This document suggests two possible approaches to use measurement-based data and measurements for LNG upstream impacts, including methane emissions, complemented with a conservative default emission factor in case the data is not available, calculated as the 75th percentile of the global values, at 27.95 gCO2eq/MJ. Accurate, scientifically robust, and transparent default emission factors are essential to help the IMO achieve its goals and promote the energy transition of the international shipping sector.
