When the Apply Carbon Expenses to Period check box is enabled in Monthly Accruals, the system does not simply prorate expenses across the voyage. Instead, it accrues costs based on actual emissions, using the bunker consumption data recorded in the voyage.
The calculation is more precise because it relies on real noon report data, when available, rather than estimated.
Calculation Formula
The system uses the following formula for each fuel type:
Actual Fuel Consumption * Phase-In % * ETS % * CO₂ Factor / Currency Exchange Rate * CO₂ Price per MT
Where:
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Actual Fuel Consumption = Actual bunker consumption recorded for the period (from voyage noon reports).
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Phase-In % = Regulatory phase-in percentage.
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ETS % = EU ETS applicability percentage (based on voyage legs inside/outside the EU).
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CO₂ Factor = CO₂ emissions factor for the fuel type.
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Currency Exchange Rate = Conversion rate between cost currency and reporting currency.
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CO₂ Price per MT = Market or fixed price of CO₂ per metric ton.
If no actual bunker consumption is available, the system falls back to using estimated from the Carbon Calculator module.