Calculating EUA commitment for all parties (the EUA to surrender) in the ETS module relies on the following:
- CO2eq of each fuel type (after exemptions have been applied)
- Looking up the departure and arrival ports and their status in the ETS scheme:
- Are they an EU member state ports?
- Are they an EU transshipment ports?
- Transshipment ports are non-member state ports that have special rules applied to them.
- Are they EU outermost regions ports?
- Outermost regions have specific EUA rules applied to them. If the voyages they are related to, are part to their own member state (The Canaries and Spain for example) port calls or to voyages between other outermost regions tied to the same member state special rules apply.
- Otherwise they are treated as normal member state ports.
- Are they non member state ports (not part of any of the above)?
- Deriving the voyage type (intra region, inbound, outbound, non region) based on the departure and arrival port.
- Special rules apply to the previous departure port and next arrival port in case of transshipment ports.
- Look up the percentage of CO2eq (in metric tons) to surrender as EUA (1 CO2eq MT is 1 EUA) for the voyage in question and apply to the CO2eq:
- voyage_EUA _to_surrender = percentage_to_surrender_for_voyage_type * CO2eq_for_voyage_metric_tons
- Apply the grace period percentage (40% of total for 2024, 70% of total for 2025, 100% (no grace) for 2026 and beyond) to the voyage_EUA_to_surrender to arrive the final EUA to surrender.
- final_voyage_EUA_to_surrender = grace_period_percentage * voyage_EUA_to_surrender
Voyage Offhires EUA
For charter parties, the sum of offhires' EUA that occur during a voyage is calcuated as the ratio of the voyage EUA calculations and fuel types (see Offhires sections)
Voyage Net EUA
Voyage Net EUA for the charterer to surrender is then the Voyage EUA subtracted by Voyage Offhires EUA, accounting for the grace period percentage.
Periods commitment, either quarterly commitment or monthly, is then the total sum of all net voyage EUA commitments during the period in question.