Chemical tanker · Marshall Islands flag · built 2020
STI MAESTRO: CO₂ emissions 2020–2025
IMO 9854727 EU ETS2 reporting years
- CO₂ reported 2025
- 3,770 t
- Fuel burned
- 1,204 t
- Distance
- 14,449 nm
- Time at sea
- 1,141 h
- Emitted at berth
- 6% of total
- Share of year under way
- 13%
STI MAESTRO against its type
Built in 2020, it is 10 years newer than the median chemical tanker on this register, which was built in 2010 (1,951 vessels with a known build year). It is one of 474 chemical tankers here under the Marshall Islands flag, 20.2% of the 2,344 on the register. The same builder is recorded for 77 other vessels here, 27 of them chemical tankers. Its MRV returns name it STI MAESTRO for 2020 and ODYSSEAN for 2025. The reported port of registry changed: Singapore (2020), then Majuro (2025).
Its 3,770 t of CO₂ for 2025 is 32% below the median of 5,533 t among the 1,483 chemical tankers on this register that reported for 2025. Per nautical mile it emitted 260.9 kg CO₂, close to the type median of 250.2 kg. It logged 1,141 hours at sea against a median of 2,109 hours for its type that year. 5.8% of its 2025 emissions were at berth; the median for chemical tankers was 6.6%. Its efficiency percentile within the type went from 12 in 2020 to 6 in 2025 (lower is more efficient). Of the 5 sister ships listed below with a 2025 return, 1 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2020–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 3,770 | 1,204 | 14,449 | 1,141 | 217 | 260.9 | 7.5 | 6 |
| 2020 | 10,265 | 3,282 | 42,687 | 3,737 | 932 | 240.5 | 9.5 | 12 |
Vessel particulars
- IMO number
- 9854727
- Previously reported as
- ODYSSEAN
- Ship type
- Chemical tanker
- Length overall
- 183.0 m
- Beam
- 32.0 m
- Year built
- 2020
- Flag state
- Marshall Islands per EU MRV 2025
- Port of registry
- Majuro MRV 2025
- Technical efficiency (design)
- EEDI (4.15 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
- 2026-03-30
- Compliance document expires
- 2027-06-30
Efficiency against its own type2025
Position 88 of 1,348 qualifying chemical tankers by EEOI, at the 6th percentile. The dashed line is the type median, 14.4; this vessel reported 7.5.
EEOI divides emissions by transport work, which for this vessel and year was 504,725,569 tonne-miles over 14,449 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 63.3% lower than in 2020, for EU/EEA voyages only. No return is recorded for 2021, 2022, 2023, 2024, so the series has gaps.
From 2020 to 2025, emissions fell 63.3% while distance sailed fell 66.2%and CO₂ per nautical mile rose 8.5%.That points mainly to how much the vessel sailed, rather than the other.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 3,829 t
- Methane (CH₄)
- 0.06 t
- Nitrous oxide (N₂O)
- 0.22 t
- Under EU ETS
- 660 t, 18% of total
Laden voyages2025
- CO₂ on laden voyages
- 1,075 t, 29% of total
- Fuel, laden
- 344 t
- CO₂ per nm, laden
- 246.0 kg
The rest of the 2025 total was emitted on ballast legs or at berth.
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2020 | DNV | Germany |
| 2025 | AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. LTD) | Greece |
A change of verifier is not in itself a sign of anything being wrong.
Sources and how to read this
- Emissions: EU MRV publication (THETIS-MRV), reporting years 2020–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0).
This page draws on 2 MRV reporting years, an efficiency ranking, 4 of 5 vessel particulars and a name history. Not found in the sources for this vessel: AIS movements in Norwegian waters, 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.