Container ship · United Kingdom flag

MAERSK CHICAGO

IMO 9332975 EU ETS8 reporting years

CO₂ reported 2025: 9,568 t
Fuel burned: 3,072 t
Distance: 13,061 nm
Time at sea: 743 h
Emitted at berth: 0% of total
Share of year under way: 8%

Vessel particulars

IMO number: 9332975
Ship type: Container ship
Flag state: United Kingdom
Port of registry: Norfolk
Technical efficiency (design): EEDI (15.56 gCO₂/t·nm)
Verifier: AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. LTD), Greece
Accreditation: 1083-2
Compliance document issued: 2026-03-25
Compliance document expires: 2027-06-30

Flag state is derived from the reported port of registry, not reported directly, and reflects the registry at the time of reporting.

Efficiency against its own type2025

Position 610 of 1,838 qualifying container ships by EEOI, at the 33th percentile. The dashed line is the type median, 14.2; this vessel reported 10.5.

EEOI divides emissions by transport work, which for this vessel and year was 909,528,517 tonn-nmover 13,061 nautical miles.

Reported CO₂ by year

Between 2018 and 2025 reported CO₂ fell by 76.9%.

From 2024 to 2025, emissions fell 84.6% while distance sailed fell 85.1%and CO₂ per nautical mile rose 3.0%.That points mainly to how much the vessel sailed, rather than the other.

Annual returns2018–2025

Year	CO₂ (t)	Fuel (t)	Distance (nm)	At sea (h)	At berth (t)	kg CO₂/nm	EEOI	Percentile
2025	9,568	3,072	13,061	743	32	732.6	10.5	33
2024	62,283	19,999	87,544	5,036	169	711.5	10.9	31
2023	34,107	10,951	57,060	3,626	167	597.7	9.2	19
2022	34,650	11,126	52,188	3,203	174	664.0	10.1	21
2021	37,071	11,902	56,057	3,336	222	661.3	10.8	25
2020	36,065	11,573	54,948	3,469	276	656.4	11.1	29
2019	37,592	12,069	55,325	3,229	330	679.5	10.6	23
2018	41,404	13,287	59,908	3,674	256	691.1	10.6	20

Where the 2025 emissions occurred

Methane, nitrous oxide and EU ETS2025

Total CO₂ equivalent: 9,719 t
Methane (CH₄): 0.15 t
Nitrous oxide (N₂O): 0.55 t
Under EU ETS: 4,800 t, 50% of total

Laden voyages2025

CO₂ on laden voyages: 9,537 t, 100% of total
Fuel, laden: 3,062 t
CO₂ per nm, laden: 730.2 kg

The share carried on laden voyages separates productive sailing from ballast legs. For tankers, bulkers and ro-ro vessels that split is the operational question; a low laden share means the ship spent much of the year moving empty.

Sources and how to read this

Emissions: EU MRV publication (THETIS-MRV), reporting years 2018–2025, published by the European Commission.

What this page is built on

Reporting years: 8
Ranked by efficiency: yes
Vessel particulars: 1 of 5
Movement data: not observed
Name history: none recorded
Photograph: none licensed
Sanctions record: none
Inspection record: none in US waters

Caveats that apply to every vessel page

EEOI above 100,000 is withheld. Those values come from returns where reported transport work is near zero, which makes the ratio meaningless rather than extreme. Median across the dataset is around 12.

Emission categories overlap. In the MRV return, emissions at berth are also counted inside the voyage legs, so the categories do not sum to the total. They are shown side by side rather than stacked for that reason.

Distance is derived, intensity is reported. The MRV return publishes CO₂ per nautical mile but not the distance itself, which is null in all 106,564 rows of the source. The distance column is therefore filled from the ranking step, which reconstructs it, and is blank for years where a vessel was not ranked. That is why a row can show an intensity without a distance.

Percentile is within type and year. It is the vessel's position among qualifying ships of the same type that year, where lower is more efficient. A blank means the vessel did not qualify for ranking that year.

Sister ships share a builder, a type and a build year within two years of this vessel. That holds hull and machinery roughly constant and leaves operation as the variable, which is why they are listed before nearest-by-tonnage.

Methane and nitrous oxide start in 2024. They were not reported before that period, so earlier years cannot be compared against them.

Technical efficiency is a design figure fixed at construction. A vessel can hold a good index and still emit heavily by sailing fast, waiting at anchor or carrying little.

Inspection records cover United States waters only. An empty record is not evidence of a clean history elsewhere.

Empty means unreported, never zero. Nothing here is modelled, estimated or interpolated. See the methodology.

Something wrong on this page? See corrections. We do not hold the source registers and cannot amend them, but we will fix anything we have got wrong in reproducing them.