Oil tanker · Portugal flag · built 2007
STEN AURORA: CO₂ emissions 2018–2025
IMO 9318565 EU ETS8 reporting years
- CO₂ reported 2025
- 5,056 t
- Fuel burned
- 1,578 t
- Time at sea
- 2,285 h
- Emitted at berth
- 13% of total
- Share of year under way
- 26%
- Gross tonnage
- 11,935
STEN AURORA against its type
Built in 2007, it is 3 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: Bergen (2018–2023), then Madeira (2024–2025).
Its 5,056 t of CO₂ for 2025 is 36% 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 212.4 kg CO₂, 47% below the type median of 403.2 kg. It logged 2,285 hours at sea against a median of 2,030 hours for its type that year. 12.9% 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 (9,263 t) and the lowest 2024 (4,074 t). Its efficiency percentile within the type went from 91 in 2018 to 98 in 2023 (lower is more efficient). Of the 8 sister ships listed below with a 2025 return, 0 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 | 5,056 | 1,578 | — | 2,285 | 655 | 212.4 | 28.3 | not ranked |
| 2024 | 4,074 | 1,273 | — | 1,874 | 452 | 213.6 | 23.5 | not ranked |
| 2023 | 8,606 | 2,689 | 39,641 | 3,930 | 1,152 | 217.1 | 37.2 | 98 |
| 2022 | 6,019 | 1,877 | 26,516 | 2,786 | 1,222 | 227.0 | 27.2 | 96 |
| 2021 | 7,650 | 2,386 | 38,023 | 4,342 | 861 | 201.2 | 18.7 | 89 |
| 2020 | 9,263 | 2,889 | 42,791 | 4,887 | 1,189 | 216.5 | 23.1 | 92 |
| 2019 | 9,136 | 2,850 | 45,100 | 6,129 | 1,479 | 202.6 | 28.1 | 96 |
| 2018 | 8,333 | 2,603 | 40,465 | 6,315 | 937 | 205.9 | 20.6 | 91 |
Vessel particulars
- IMO number
- 9318565
- Ship type
- Oil tanker
- Gross tonnage
- 11,935
- Length overall
- 144.2 m
- Beam
- 23.2 m
- Year built
- 2007
- Flag state
- Portugal per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Norway. 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 (7.49 gCO₂/t·nm)
- Efficiency ranking
- Not ranked: transport work below the floor (2025)
- Verifier
- DNV, Germany
- Accreditation
- VS-16026-01
- Compliance document issued
- 2026-02-16
- Compliance document expires
- 2027-06-30
Reported CO₂ by year
Reported CO₂ in 2025 was 39.3% lower than in 2018, for EU/EEA voyages only.
From 2024 to 2025, emissions rose 24.1% and CO₂ per nautical mile fell 0.6%.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
- 5,133 t
- Methane (CH₄)
- 0.08 t
- Nitrous oxide (N₂O)
- 0.28 t
- Under EU ETS
- 4,159 t, 82% 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) and Wikimedia Commons.
This page draws on 8 MRV reporting years, 5 of 5 vessel particulars and a licensed photograph. Not found in the sources for this vessel: an efficiency ranking, AIS movements in Norwegian waters, 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.