Container ship · United States flag · built 2009
MAYSSAN: CO₂ emissions 2018–2025
IMO 9349526 EU ETS8 reporting years
- CO₂ reported 2025
- 6,255 t
- Fuel burned
- 1,994 t
- Time at sea
- 761 h
- Emitted at berth
- 4% of total
- Share of year under way
- 9%
- Gross tonnage
- 75,579
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MAYSSAN against its type
Built in 2009, it is 1 year newer than the median container ship on this register, which was built in 2008 (3,088 vessels with a known build year). At 75,579 gross tonnage it is larger than 66% of the other 3,000 container ships with a recorded tonnage. It is one of 7 container ships here under the United States flag, 0.2% of the 3,495 on the register. The same builder is recorded for 761 other vessels here, 355 of them container ships. Hapag-Lloyd is linked to 28 vessels on this register. Its MRV returns name it MAYSSAN for 2018–2020 and POTOMAC EXPRESS for 2021–2025. The reported port of registry changed: Monrovia (2018–2020), then Norfolk, VA (2021–2025).
Its 6,255 t of CO₂ for 2025 is 62% below the median of 16,359 t among the 2,234 container ships on this register that reported for 2025. Per nautical mile it emitted 575.4 kg CO₂, close to the type median of 545.6 kg. It logged 761 hours at sea against a median of 3,155 hours for its type that year. 3.5% of its 2025 emissions were at berth; the median for container ships was 3.2%. Across 8 years with reported emissions, the highest was 2022 (34,472 t) and the lowest 2025 (6,255 t). Its efficiency percentile within the type went from 36 in 2018 to 37 in 2024 (lower is more efficient). Of the 3 sister ships listed below with a 2025 return, 3 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2018–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 6,255 | 1,994 | — | 761 | 220 | 575.4 | — | — |
| 2024 | 25,715 | 8,211 | 48,592 | 3,287 | 1,086 | 529.2 | 12.3 | 37 |
| 2023 | 23,932 | 7,632 | 36,068 | 2,358 | 942 | 663.5 | 19.8 | 58 |
| 2022 | 34,472 | 10,958 | 45,586 | 2,664 | 1,511 | 756.2 | 15.5 | 46 |
| 2021 | 23,284 | 7,418 | 32,795 | 2,360 | 1,431 | 710.0 | 14.0 | 40 |
| 2020 | 21,315 | 6,755 | 30,503 | 2,276 | 1,746 | 698.8 | 13.5 | 40 |
| 2019 | 23,253 | 7,446 | 29,332 | 2,433 | 1,927 | 792.8 | 15.1 | 42 |
| 2018 | 17,428 | 5,589 | 21,547 | 1,675 | 761 | 808.8 | 15.2 | 36 |
Vessel particulars
- IMO number
- 9349526
- Previously reported as
- POTOMAC EXPRESS
- Ship type
- Container ship
- Gross tonnage
- 75,579
- Length overall
- 306.0 m
- Beam
- 40.1 m
- Year built
- 2009
- Flag state
- United States Wikidata/AIS, undated
- Builder
- HD Hyundai Heavy Industries
- Port of registry
- Norfolk, VA MRV 2025
- Home port
- Norfolk, VA
- Technical efficiency (design)
- EEXI (10.46 gCO₂/t·nm)
- Operator
- Hapag-Lloyd
- Verifier
- AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. LTD), Greece
- Accreditation
- 1083-2
- Compliance document issued
- 2026-03-19
- Compliance document expires
- 2027-06-30
Efficiency against its own type2024
Position 622 of 1,661 qualifying container ships by EEOI, at the 37th percentile. The dashed line is the type median, 15.4; this vessel reported 12.3.
Across the 24 ranked vessels operated by Hapag-Lloyd, the median percentile is 29. This vessel is less efficient than its own fleet median.
EEOI divides emissions by transport work, which for this vessel and year was 2,088,941,511 tonne-miles over 48,592 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 64.1% lower than in 2018, for EU/EEA voyages only.
From 2024 to 2025, emissions fell 75.7% and CO₂ per nautical mile rose 8.7%.Distance is missing for at least one of the two years, so activity and efficiency cannot be separated here.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 6,353 t
- Methane (CH₄)
- 0.10 t
- Nitrous oxide (N₂O)
- 0.36 t
- Under EU ETS
- 3,527 t, 56% of total
Laden voyages2025
- CO₂ on laden voyages
- 6,035 t, 96% of total
- Fuel, laden
- 1,925 t
The rest of the 2025 total was emitted on ballast legs or at berth.
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2018 | DNV | Germany |
| 2021 | AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. LTD) | Greece |
A change of verifier is not in itself a sign of anything being wrong.
Sources and how to read this
- Emissions: EU MRV publication (THETIS-MRV), reporting years 2018–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0) and Wikimedia Commons.
This page draws on 8 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars, a name history and a licensed photograph. Not found in the sources for this vessel: AIS movements in Norwegian waters, a sanctions listing and US port state inspections.
Empty means unreported, never zero. How EEOI, distance, percentiles and sister ships are handled is explained under reading a vessel page. Something wrong? See corrections.