Oil tanker · Portugal flag · built 2016

KLEON: CO₂ emissions 2018–2025

IMO 9730945 EU ETS7 reporting years

CO₂ reported 2025: 6,739 t
Fuel burned: 2,153 t
Distance: 17,037 nm
Time at sea: 1,508 h
Emitted at berth: 6% of total
Share of year under way: 17%
Gross tonnage: 63,694

KLEON against its type

Built in 2016, it is 6 years newer than the median oil tanker on this register, which was built in 2010 (2,896 vessels with a known build year). At 63,694 gross tonnage it is larger than 65% of the other 2,841 oil tankers with a recorded tonnage. It is one of 56 oil tankers here under the Portugal flag, 1.6% of the 3,548 on the register. The same builder is recorded for 196 other vessels here, 75 of them oil tankers. The reported port of registry changed: Majuro (2018–2024), then Madeira (2025).

Its 6,739 t of CO₂ for 2025 is 15% below the median of 7,922 t among the 1,704 oil tankers on this register that reported for 2025. Per nautical mile it emitted 395.6 kg CO₂, close to the type median of 403.2 kg. It logged 1,508 hours at sea against a median of 2,030 hours for its type that year. 5.7% of its 2025 emissions were at berth; the median for oil tankers was 7.8%. Across 7 years with reported emissions, the highest was 2019 (15,953 t) and the lowest 2024 (1,014 t). Its efficiency percentile within the type went from 51 in 2019 to 6 in 2025 (lower is more efficient). Of the 4 sister ships listed below with a 2025 return, 4 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	6,739	2,153	17,037	1,508	385	395.6	4.1	6
2024	1,014	316	—	197	421	694.1	19.1	not ranked
2022	11,436	3,664	31,733	2,617	766	360.4	4.8	10
2021	2,892	923	7,714	978	304	375.0	10.4	66
2020	1,073	341	—	222	346	455.2	—	—
2019	15,953	5,103	38,846	3,832	1,245	410.7	8.6	51
2018	3,553	1,135	—	843	312	415.5	37.9	not ranked

Vessel particulars

IMO number: 9730945
Ship type: Oil tanker
Gross tonnage: 63,694
Length overall: 249.0 m
Beam: 44.0 m
Year built: 2016
Flag state: Portugal per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Marshall Islands. The flag shown is from the newest official source, the EU MRV return for 2025.
Builder: Sungdong Shipbuilding & Marine Engineering
Port of registry: Madeira MRV 2025
Technical efficiency (design): EEXI (3.01 gCO₂/t·nm)
Verifier: DNV, Germany
Accreditation: VS-16026-01
Compliance document issued: 2026-02-27
Compliance document expires: 2027-06-30

Efficiency against its own type2025

Position 95 of 1,448 qualifying oil tankers by EEOI, at the 6th percentile. The dashed line is the type median, 7.5; this vessel reported 4.1.

EEOI divides emissions by transport work, which for this vessel and year was 1,655,810,811 tonne-miles over 17,037 nautical miles.

Reported CO₂ by year

Reported CO₂ in 2025 was 89.7% higher than in 2018, for EU/EEA voyages only. No return is recorded for 2023, so the series has gaps.

From 2024 to 2025, emissions rose 564.6% and CO₂ per nautical mile fell 43.0%.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: 6,845 t
Methane (CH₄): 0.11 t
Nitrous oxide (N₂O): 0.39 t
Under EU ETS: 3,654 t, 54% of total

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).

This page draws on 7 MRV reporting years, an efficiency ranking and 5 of 5 vessel particulars. Not found in the sources for this vessel: AIS movements in Norwegian waters, a name history, a licensed photograph, 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.