Chemical tanker · Portugal flag · built 2009
STEN SKAGEN: CO₂ emissions 2019–2025
IMO 9460239 MMSI 255915977EU ETS7 reporting years
- CO₂ reported 2025
- 6,987 t
- Fuel burned
- 2,179 t
- Distance
- 28,731 nm
- Time at sea
- 2,925 h
- Emitted at berth
- 15% of total
- Share of year under way
- 33%
- Gross tonnage
- 13,283
STEN SKAGEN against its type
Built in 2009, it is 1 year older than the median chemical tanker on this register, which was built in 2010 (1,951 vessels with a known build year). At 13,283 gross tonnage it is smaller than 64% of the other 1,899 chemical tankers with a recorded tonnage. It is one of 71 chemical tankers here under the Portugal flag, 3.0% of the 2,344 on the register. The reported port of registry changed: Gibraltar (2019–2023), then Madeira (2024–2025).
Its 6,987 t of CO₂ for 2025 is 26% above the median of 5,531 t among the 1,484 chemical tankers on this register that reported for 2025. Per nautical mile it emitted 243.2 kg CO₂, close to the type median of 250.2 kg. It logged 2,925 hours at sea against a median of 2,106 hours for its type that year. 15.0% of its 2025 emissions were at berth; the median for chemical tankers was 6.6%. Across 7 years with reported emissions, the highest was 2020 (11,661 t) and the lowest 2024 (6,413 t). Its efficiency percentile within the type went from 98 in 2019 to 84 in 2025 (lower is more efficient). Of the 4 comparable vessels listed below with a 2025 return, 3 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2019–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 6,987 | 2,179 | 28,731 | 2,925 | 1,047 | 243.2 | 29.5 | 84 |
| 2024 | 6,413 | 2,000 | 24,891 | 2,405 | 991 | 257.6 | 31.2 | 82 |
| 2023 | 8,657 | 2,700 | 34,746 | 3,439 | 1,479 | 249.2 | 28.8 | 80 |
| 2022 | 9,683 | 3,020 | 37,744 | 3,907 | 1,241 | 256.6 | 32.5 | 86 |
| 2021 | 10,163 | 3,170 | 40,750 | 3,861 | 1,357 | 249.4 | 29.6 | 97 |
| 2020 | 11,661 | 3,637 | 41,544 | 3,937 | 1,779 | 280.7 | 31.6 | 97 |
| 2019 | 8,755 | 2,731 | 30,074 | 5,147 | 1,376 | 291.1 | 35.3 | 98 |
Vessel particulars
- IMO number
- 9460239
- MMSI
- 255915977
- Call sign
- CQ2435
- Ship type
- Chemical tanker
- Gross tonnage
- 13,283
- Length overall
- 148.7 m
- Beam
- 24.0 m
- Year built
- 2009
- 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. - Port of registry
- Madeira MRV 2025
- Ice class
- IA
- Technical efficiency (design)
- EEXI (7.48 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 1,128 of 1,348 qualifying chemical tankers by EEOI, at the 84th percentile. The dashed line is the type median, 14.4; this vessel reported 29.5.
EEOI divides emissions by transport work, which for this vessel and year was 236,993,894 tonne-miles over 28,731 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 20.2% lower than in 2019, for EU/EEA voyages only.
From 2024 to 2025, emissions rose 8.9% while distance sailed rose 15.4%and CO₂ per nautical mile fell 5.6%.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
- 7,094 t
- Methane (CH₄)
- 0.11 t
- Nitrous oxide (N₂O)
- 0.39 t
- Under EU ETS
- 5,799 t, 83% of total
Observed movementsAIS · Norwegian waters
- First seen
- 01 Nov 2025
- Last seen
- 16 May 2026
- Days observed
- 31
- Positions
- 1,652
- Median speed
- 11.0 kn
Its recorded positions span 58.0°N to 60.8°N and 4.4°E to 10.7°E.
400 hourly points from 1,652 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 2019–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0) and Wikimedia Commons.
- Movements: Norwegian Coastal Administration open AIS extract.
This page draws on 7 MRV reporting years, an efficiency ranking, 4 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.