Oil tanker · Portugal flag · built 2008
STEN ARNOLD: CO₂ emissions 2018–2025
IMO 9371610 MMSI 255915983EU ETS8 reporting years
- CO₂ reported 2025
- 8,107 t
- Fuel burned
- 2,531 t
- Distance
- 34,182 nm
- Time at sea
- 3,569 h
- Emitted at berth
- 9% of total
- Share of year under way
- 41%
- Gross tonnage
- 11,935
STEN ARNOLD against its type
Built in 2008, it is 2 years older than the median oil tanker on this register, which was built in 2010 (2,896 vessels with a known build year). At 11,935 gross tonnage it is smaller than 94% 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 98 other vessels here, 19 of them oil tankers. The reported port of registry changed: Gibraltar (2018–2023), then Madeira (2024–2025).
Its 8,107 t of CO₂ for 2025 is close to the median of 7,922 t among the 1,704 oil tankers on this register that reported for 2025. Per nautical mile it emitted 237.2 kg CO₂, 41% below the type median of 403.2 kg. It logged 3,569 hours at sea against a median of 2,030 hours for its type that year. 9.2% of its 2025 emissions were at berth; the median for oil tankers was 7.8%. Across 8 years with reported emissions, the highest was 2020 (9,605 t) and the lowest 2025 (8,107 t). Its efficiency percentile within the type went from 90 in 2018 to 97 in 2025 (lower is more efficient). Of the 8 sister ships listed below with a 2025 return, 3 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 | 8,107 | 2,531 | 34,182 | 3,569 | 744 | 237.2 | 28.7 | 97 |
| 2024 | 8,266 | 2,578 | 34,233 | 3,348 | 1,626 | 241.5 | 25.5 | 96 |
| 2023 | 8,187 | 2,555 | 36,258 | 3,455 | 1,451 | 225.8 | 25.2 | 95 |
| 2022 | 8,404 | 2,621 | 35,968 | 4,342 | 1,320 | 233.7 | 28.1 | 96 |
| 2021 | 8,429 | 2,629 | 40,444 | 3,836 | 1,362 | 208.4 | 27.7 | 96 |
| 2020 | 9,605 | 2,996 | 44,714 | 4,612 | 1,227 | 214.8 | 25.3 | 93 |
| 2019 | 8,949 | 2,795 | 44,304 | 6,150 | 1,177 | 202.0 | 26.8 | 95 |
| 2018 | 8,598 | 2,686 | 47,733 | 6,442 | 1,030 | 180.1 | 20.4 | 90 |
Vessel particulars
- IMO number
- 9371610
- MMSI
- 255915983
- Call sign
- CQ2441
- Ship type
- Oil tanker
- Gross tonnage
- 11,935
- Length overall
- 144.1 m
- Beam
- 24.0 m
- Year built
- 2008
- Flag state
- Portugal per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Gibraltar. The flag shown is from the newest official source, the EU MRV return for 2025. - Builder
- Jiangnan Shipyard
- Port of registry
- Madeira MRV 2025
- Ice class
- IA
- Technical efficiency (design)
- EEXI (7.43 gCO₂/t·nm)
- Verifier
- DNV, Germany
- Accreditation
- VS-16026-01
- Compliance document issued
- 2026-02-16
- Compliance document expires
- 2027-06-30
Efficiency against its own type2025
Position 1,407 of 1,448 qualifying oil tankers by EEOI, at the 97th percentile. The dashed line is the type median, 7.5; this vessel reported 28.7.
EEOI divides emissions by transport work, which for this vessel and year was 282,164,288 tonne-miles over 34,182 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 5.7% lower than in 2018, for EU/EEA voyages only.
From 2024 to 2025, emissions fell 1.9% while distance sailed fell 0.1%and CO₂ per nautical mile fell 1.8%.That points mainly to how efficiently it sailed, rather than the other.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 8,231 t
- Methane (CH₄)
- 0.13 t
- Nitrous oxide (N₂O)
- 0.46 t
- Under EU ETS
- 7,645 t, 94% of total
Observed movementsAIS · Norwegian waters
- First seen
- 19 Jul 2025
- Last seen
- 26 Jul 2026
- Days observed
- 31
- Positions
- 1,957
- Median speed
- 11.2 kn
Its recorded positions span 58.0°N to 60.8°N and 4.4°E to 10.8°E.
400 hourly points from 1,957 positions. Filled circle first, open circle last; squares are ports for orientation, not calls.
Positions recorded per month
Norwegian Coastal Administration open AIS, Norwegian waters only, 01 Jul 2025 to 27 Jul 2026. A gap means the vessel was not recorded here, not that it was idle or that a transponder was off.
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.
- Movements: Norwegian Coastal Administration open AIS extract.
This page draws on 8 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars, AIS movements in Norwegian waters and a licensed photograph. Not found in the sources for this vessel: a name history, 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.