Rewarding Green Operations: How the MarineDeCarb ESI Calculator Works

GO ESI Calculator

In today's maritime industry, going green doesn't just save the planet—it saves money. The Environmental Ship Index (ESI) is a globally recognized scoring system that evaluates the environmental performance of sea-going vessels regarding their air emissions (NOx, SOx, and CO2). Achieving a high ESI score grants shipowners and operators significant financial incentives, including substantial discounts on port dues worldwide.

Calculating your exact ESI score, however, involves complex formulas and strict IMO reporting rules. To make this process interactive and effortless, we have launched the MarineDeCarb ESI Calculator. Let’s explore step-by-step how you can simulate and optimize your vessel's ESI score using our free dashboard.

Step 1: Configure Vessel Basics, OPS, and CO2 Reporting

Your ESI journey starts on the left sidebar, where you define the core operational capabilities of your vessel:

• Onshore Power Supply (OPS): Simply check the box if your vessel is equipped to connect to shore power. The ESI framework immediately rewards this capability with a direct bonus of 10 points!

  
  

• CO2 Reporting & Efficiency: ESI rewards vessels that monitor and improve their Energy Efficiency Operational Indicator (EEOI). By confirming that you report your fuel/distance data and using the slider to input your CO2 Efficiency Increase (%), the calculator automatically computes your CO2 bonus points (up to 15 points).

Step 2: Input Your Engine’s NOx Data

The main dashboard is divided into two operational halves. The left side handles your NOx (Nitrogen Oxides) performance.

• Based on your engine's EIAPP certificate, input the Rated Power (kW), the mandatory NOx Limit (g/kWh) according to IMO Tier standards, and your engine's Actual NOx Rating (g/kWh).

• You can add multiple engines (Main and Auxiliary). Our engine mathematically weights each engine's performance relative to its power output, calculating your precise NOx sub-points.

  
  

Step 3: Log Your Fuel Sulfur Content (SOx)

The right side of the dashboard is dedicated to SOx (Sulfur Oxides) emissions, which heavily rely on your fuel choices.

• Grab your Bunker Delivery Notes (BDNs) for the last 6 months. Enter the quantity and the exact Sulfur percentage of the fuels consumed. Whether you use VLSFO (MID sulfur), LSMGO (LOW sulfur), or zero-sulfur alternative fuels like LNG or Biodiesel, the system instantly classifies them.

  
  

• Operational Profile: Select your sailing behavior from the dropdown menu (e.g., switching to LSMGO only in SECA zones vs. burning LOW fuel everywhere as a "Frontrunner"). The calculator applies the official ESI reduction formulas to determine your SOx score.

Step 4: Analyze Your Final ESI Score

Once your engine and fuel data are logged, the dashboard brings your performance to life:

• The Top Metrics display your Total ESI Score out of 100, beautifully broken down into individual NOx, SOx, CO2, and OPS components.

• A dynamic Gauge Chart visually indicates your overall standing, showing you exactly how close you are to maximizing your port incentives.

• The Stacked Bar Chart breaks down your score visually, making it incredibly easy to identify which area (e.g., switching to cleaner fuel or installing OPS) could boost your score the most.

Step 5: Export Your ESI Simulation Report

Do you need to share your simulated score with your technical department or prepare for official ESI portal entry? Click the "Prepare ESI Report (PDF)" button on the sidebar. The MarineDeCarb engine will instantly generate a clean, corporate PDF detailing your Total ESI Score, sub-component breakdowns, weighted BDN averages, and engine details.

Green Ships, Green Seas, Green World!

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