'Well-to-Wake' LNG Study Finds Big Emissions Savings
Using LNG as shipping fuel can cut CO2 emissions by up to 21% relative to oil-based marine fuels, according to a study by independent consultancy Thinkstep published April 18.
The study, which may be read here, considers all emissions from the wellhead to the ship's wake and also confirms that emissions of other local pollutants, such as sulphur oxides (SOx), nitrogen oxides (NOx) and particulate matter (PM), are close to zero when using LNG, said Finnish energy firm Gasum, a proponent of LNG bunkering.
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“This study confirms that our customers contribute to a cleaner environment and a cleaner future. From a market perspective, it gives an in-depth understanding for shipowners still in doubt whether to convert to LNG for their newbuilds. Taking into consideration that the study includes the entire life-cycle of the fuel it adds value and reasons to continue developing the LNG for marine fuel purposes and beyond,” said Gasum's gas head Kimmo Rahkamo.
The study was commissioned by SEA\LNG and SGMF and conducted by leading data and consultancy provider Thinkstep according to ISO standards. The report, which has been reviewed by a panel of independent academic experts, is the definitive study into GHG emissions from current marine engines.
Engine technology
On an engine technology basis, the absolute Well-to-Wake emissions reduction benefits for LNG-fuelled engines compared with HFO fuelled ships today are between 14% to 21% for 2-stroke slow speed engines and between 7% to 15% for 4-stroke medium speed engines. 72% of the marine fuel consumed today is by 2-stroke engines with a further 18% used by 4-stroke medium speed engines.