The initial International Maritime Organization (IMO) Strategy on reduction of greenhouse gas (GHG) emissions from ships, adopted at the 72nd session of the Marine Environment Protection Committee (MEPC), set specific milestones such as reduction of carbon dioxide (CO₂) emissions per transport work, by at least 40 percent by 2030 and by 70 percent by 2050 along with reducing total annual GHG emissions from international shipping by at least 50 percent by 2050. Furthermore, the initial strategy established a road map specifying follow-up actions for revising the strategy in 2023, by setting more ambitious targets along with short-, mid- and long-term measures.
At MEPC 80, the IMO adopted the 2023 Revised IMO Strategy on Reduction of GHG Emissions from Ships. The 2023 IMO GHG Strategy increases the levels of ambition compared to the Initial IMO Strategy on Reduction of GHG Emissions from Ships. The levels of ambition and indicative checkpoints shall consider the Well-to-Wake (WtW) GHG emissions of marine fuels, as addressed in the Guidelines on life-cycle GHG intensity of marine fuels life-cycle analysis (LCA) Guidelines with the overall objective of reducing GHG emissions of international shipping without a shift to other sectors.
Speed-Power Curves and Fuel Consumption Tables are created for either standard conditions and/or specified weather conditions. Under specified weather conditions the resistance due to added wind and waves is considered in the vessel’s propulsion model. The effect of coatings is considered through an Average Hull Roughness (AHR) value.
Note: For pre-EEDI vessels, the speed-power curve in standard conditions at the design or EEDI draft based on full-scale predictions from model test report can be used in the context of EEXI regulation subject to the new hull roughness measurements being carried out as per NACE SP0616- 2022 “Standard for Hull Roughness Measurements on Ship Hulls in Dry fDock”, by an independent company, and witnessed by Class Surveyor.
Prediction of Fuel Savings is carried out for a range of specifications, such as past conditions within a timeframe, specified routes and specified conditions. Hindcast metocean data is utilized to estimate fuel savings. To enable stakeholders to make decisions, ABS applies transparent methodologies for the operational and route profiling and estimation of fuels savings.
Life-Cycle Cost Analysis is part of a stakeholder’s decision-making process. To derive payback time, ABS is executing the analysis using the supplied input from savings and expenditure perspectives. The influence on the cost of compliance to EU ETS regulation can be included.
Performance Evaluation After Application is carried out based on analysis of high-frequency measurements. Measurements are compared against a reference model to obtain improvement.
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