Marine Energy Efficiency Quick Reference Guide
The Marine Energy Efficiency Quick Reference Guide is a concise, actionable technical resource designed to help maritime stakeholders—such as ship operators, naval architects, and regulatory compliance officers—implement best practices and technologies that reduce fuel consumption and greenhouse gas emissions from vessels. It synthesizes internationally recognized standards (e.g., IMO EEDI, EEXI, CII), operational strategies, and retrofit solutions into easily accessible guidance. The guide emphasizes measurable performance indicators and practical implementation pathways aligned with decarbonization goals.
📖 Overview
📑 Key Components
🎯 Applications
- ✓ Vessel design optimization for newbuilds
- ✓ Retrofitting existing fleets with energy-saving technologies
- ✓ Operational decision support for voyage planning and speed management
📐 Key Formulas
EEDI
EEDI = (gCO₂/km) / (capacity × speed)
Calculates the theoretical CO₂ emissions per unit transport work for new ships, normalized by cargo capacity (in DWT or GT) and reference speed (in knots); lower values indicate higher efficiency.
EEXI
EEXI = (gCO₂/km) / (capacity × speed) × correction_factor
Determines the attained energy efficiency of existing ships using standardized engine power, shaft power, and auxiliary power assumptions; compared against required EEXI thresholds.
CII Rating
CII = (Annual CO₂ emissions in tonnes) / (Annual cargo carried × distance sailed in nautical miles)
Quantifies actual operational carbon intensity; results in an A–E rating assigned annually based on IMO benchmarks and reduction factors.