Chemical tanker · Marshall Islands flag · built 2016

ALKAIOS

IMO 9710488 EU ETS6 reporting years

CO₂ reported 2025: 1,952 t
Fuel burned: 623 t
Distance: 7,105 nm
Time at sea: 729 h
Emitted at berth: 8% of total
Share of year under way: 8%
Gross tonnage: 29,770

ALKAIOS — Niels Johannes, CC BY-SA 4.0 · File

Vessel particulars

IMO number: 9710488
Previously reported as: MADELYN GRACE
Ship type: Chemical tanker
Gross tonnage: 29,770
Length overall: 183.0 m
Beam: 32.2 m
Year built: 2016
Flag state: Marshall Islands
Builder: Samsung Heavy Industries
Port of registry: Majuro
Technical efficiency (design): EEXI (4.21 gCO₂/t·nm)
Verifier: DNV, Germany
Accreditation: VS-16026-01
Compliance document issued: 2026-02-17
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 304 of 1,348 qualifying chemical tankers by EEOI, at the 22th percentile. The dashed line is the type median, 14.4; this vessel reported 9.6.

EEOI divides emissions by transport work, which for this vessel and year was 202,892,931 tonn-nmover 7,105 nautical miles.

Reported CO₂ by year

Between 2018 and 2025 reported CO₂ fell by 45.0%. No return is recorded for 2021, 2024, so the series has gaps.

From 2023 to 2025, emissions fell 46.8% while distance sailed fell 55.0%and CO₂ per nautical mile rose 18.4%.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	1,952	623	7,105	729	147	274.7	9.6	22
2023	3,666	1,169	15,802	1,400	200	232.0	9.0	10
2022	995	313	—	443	0	229.8	—	—
2020	8,150	2,602	28,099	2,686	638	290.1	12.7	32
2019	7,317	2,341	25,498	2,204	259	287.0	14.6	39
2018	3,550	1,130	12,239	1,061	337	290.0	10.3	16

Where the 2025 emissions occurred

Methane, nitrous oxide and EU ETS2025

Total CO₂ equivalent: 1,982 t
Methane (CH₄): 0.03 t
Nitrous oxide (N₂O): 0.11 t
Under EU ETS: 1,100 t, 56% of total

Verifier history

From reporting year	Verifier	Accredited in
2018	Lloyd's Register Quality Assurance Ltd	United Kingdom
2019	HELLENIC LLOYD'S S.A.	Greece
2022	DNV	Germany

A change of accredited verifier is shown because it matters for audit and data continuity. It 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.

What this page is built on

Reporting years: 6
Ranked by efficiency: yes
Vessel particulars: 5 of 5
Movement data: not observed
Name history: yes
Photograph: yes
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.