Vehicle carrier · Japan flag · built 2013

DIONE LEADER: CO₂ emissions 2018–2025

IMO 9561954 EU ETS8 reporting years

CO₂ reported 2025: 6,896 t
Fuel burned: 2,252 t
Distance: 22,122 nm
Time at sea: 1,478 h
Emitted at berth: 3% of total
Share of year under way: 17%
Gross tonnage: 62,838

DIONE LEADER against its type

Built in 2013, it is 5 years newer than the median vehicle carrier on this register, which was built in 2008 (595 vessels with a known build year). At 62,838 gross tonnage it is larger than 75% of the other 571 vehicle carriers with a recorded tonnage. It is one of 66 vehicle carriers here under the Japan flag, 9.3% of the 713 on the register. The same builder is recorded for 307 other vessels here, 55 of them vehicle carriers. The reported port of registry changed: PANAMA (2018–2022), then TOKYO (2023–2025).

Its 6,896 t of CO₂ for 2025 is close to the median of 7,074 t among the 514 vehicle carriers on this register that reported for 2025. Per nautical mile it emitted 311.7 kg CO₂, close to the type median of 309.1 kg. It logged 1,478 hours at sea against a median of 1,639 hours for its type that year. 2.9% of its 2025 emissions were at berth; the median for vehicle carriers was 3.1%. Across 8 years with reported emissions, the highest was 2018 (10,326 t) and the lowest 2023 (385 t). Its efficiency percentile within the type went from 94 in 2018 to 39 in 2025 (lower is more efficient). Of the 3 sister ships listed below with a 2025 return, 1 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	6,896	2,252	22,122	1,478	199	311.7	46.0	39
2024	4,614	1,470	—	1,131	0	288.0	—	—
2023	385	122	—	66	58	367.4	223.6	not ranked
2022	3,554	1,124	10,982	774	240	323.6	58.2	55
2021	3,788	1,198	13,605	961	116	278.4	55.2	44
2020	3,705	1,170	9,713	883	462	381.5	58.0	54
2019	9,959	3,182	29,461	1,863	292	338.0	53.1	37
2018	10,326	3,301	33,254	2,296	139	310.5	160.6	94

Vessel particulars

IMO number: 9561954
Ship type: Vehicle carrier
Gross tonnage: 62,838
Length overall: 199.0 m
Beam: 32.0 m
Year built: 2013
Flag state: Japan per EU MRV 2025
Builder: Shin Kurushima Dockyard
Port of registry: Tokyo MRV 2025
Technical efficiency (design): EEXI (14.2 gCO₂/t·nm)
Verifier: Nippon Kaiji Kyokai, Japan
Accreditation: VS-21325-01
Compliance document issued: 2026-03-09
Compliance document expires: 2027-06-30

Efficiency against its own type2025

Position 164 of 423 qualifying vehicle carriers by EEOI, at the 39th percentile. The dashed line is the type median, 51.7; this vessel reported 46.0.

EEOI divides emissions by transport work, which for this vessel and year was 149,852,238 tonne-miles over 22,122 nautical miles.

Reported CO₂ by year

Reported CO₂ in 2025 was 33.2% lower than in 2018, for EU/EEA voyages only.

From 2024 to 2025, emissions rose 49.5% and CO₂ per nautical mile rose 8.2%.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: 7,007 t
Methane (CH₄): 0.11 t
Nitrous oxide (N₂O): 0.41 t
Under EU ETS: 3,458 t, 50% 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 8 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.