Chemical tanker · Malta flag · built 2010

KONGO STAR

IMO 9508823 MMSI 248439000EU ETS8 reporting years

CO₂ reported 2025: 6,833 t
Fuel burned: 2,133 t
Distance: 28,572 nm
Time at sea: 3,248 h
Emitted at berth: 15% of total
Share of year under way: 37%
Gross tonnage: 8,581

Vessel particulars

IMO number: 9508823
MMSI: 248439000
Ship type: Chemical tanker
Gross tonnage: 8,581
Length overall: 128.6 m
Beam: 20.4 m
Year built: 2010
Flag state: Malta
Port of registry: Valletta
Technical efficiency (design): EEXI (10.6 gCO₂/t·nm)
Verifier: DNV, Germany
Accreditation: VS-16026-01
Compliance document issued: 2026-03-09
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 1,312 of 1,348 qualifying chemical tankers by EEOI, at the 97th percentile. The dashed line is the type median, 14.4; this vessel reported 50.9.

EEOI divides emissions by transport work, which for this vessel and year was 134,376,991 tonn-nmover 28,572 nautical miles.

Reported CO₂ by year

Between 2018 and 2025 reported CO₂ fell by 15.9%.

From 2024 to 2025, emissions fell 10.0% while distance sailed fell 20.3%and CO₂ per nautical mile rose 12.8%.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	6,833	2,133	28,572	3,248	1,047	239.2	50.9	97
2024	7,595	2,378	35,838	3,828	867	211.9	48.4	95
2023	5,574	1,751	29,262	2,869	465	190.5	43.8	93
2022	6,519	2,046	34,639	3,405	1,430	188.2	43.8	95
2021	6,572	2,064	32,318	3,452	1,044	203.3	29.7	82
2020	7,193	2,255	31,707	4,039	1,222	226.8	35.4	88
2019	9,563	3,018	42,928	6,494	1,372	222.8	36.9	89
2018	8,125	2,545	36,562	6,057	1,726	222.2	39.1	90

Where the 2025 emissions occurred

Methane, nitrous oxide and EU ETS2025

Total CO₂ equivalent: 6,938 t
Methane (CH₄): 0.11 t
Nitrous oxide (N₂O): 0.38 t
Under EU ETS: 6,165 t, 90% of total

Observed movementsAIS · Norwegian waters

First seen: 07 Jun 2026
Last seen: 13 Jun 2026
Days observed: 7
Positions: 217
Median speed: 10.2 kn

146 points sampled hourly from 217 recorded positions. The filled circle is the first observed position, the open one the last. Named squares are ports, shown for orientation; they are not recorded calls.

Norwegian waters only, 01 Jul 2025 to 27 Jul 2026. A gap here means the vessel was not recorded in that area. It is not evidence that the vessel was idle, and not evidence that a transponder was switched off. Voyages elsewhere are outside this dataset.

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).
Movements: Norwegian Coastal Administration open AIS extract.

What this page is built on

Reporting years: 8
Ranked by efficiency: yes
Vessel particulars: 4 of 5
Movement data: yes
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.