선박 에너지 경계 정의에 따른 탄소집약도 지표 분석
© 2026 by the New & Renewable Energy
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Using revised International Maritime Organization (IMO) Data Collection System data and the analytical framework of Greenhouse Gas Fuel Intensity, this study evaluates alternative emission-based carbon intensity metrics and energy-intensity supporting metrics. A total of three emission-based Carbon Intensity Indicator (CII) alternative metrics and three energy-intensity supporting metrics are defined by combining operational states (under way and not-under-way) with emission and energy boundary assumptions and assessed through simulations based on annual operational data of a representative bulk carrier. The emission-based metrics are primarily governed by boundary definitions rather than onshore power supply (OPS) credits, with not-under-way fuel consumption identified as the dominant driver. Although the OPS effect increases linearly with its energy share, its impact remains limited under our baseline conditions. The energy-intensity supporting metrics vary depending on the inclusion of OPS energy, thus indicating that boundary definitions directly affect energy-based evaluation outcomes. Accordingly, future revisions of ship operational performance indicators should distinguish emission-based carbon intensity from energy-based supporting metrics and apply consistent, data-driven boundary definitions.