Oil tanker · Liberia flag
DEE4 ACACIA: CO₂ emissions 2020–2025
IMO 9311048 EU ETS3 reporting years
- CO₂ reported 2025
- 1,133 t
- Fuel burned
- 357 t
- Time at sea
- 270 h
- Emitted at berth
- 12% of total
- Share of year under way
- 3%
DEE4 ACACIA against its type
It is one of 718 oil tankers here under the Liberia flag, 20.2% of the 3,548 on the register. Its MRV returns name it DEE4 ACACIA for 2020, RIDGEBURY ACACIA for 2021 and OKEE ULF for 2025. The reported port of registry changed: LIMASSOL (2021), then Monrovia (2025).
Its 1,133 t of CO₂ for 2025 is 86% 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 372.9 kg CO₂, close to the type median of 403.2 kg. It logged 270 hours at sea against a median of 2,030 hours for its type that year. 12.3% of its 2025 emissions were at berth; the median for oil tankers was 7.8%. Across 3 years with reported emissions, the highest was 2020 (8,558 t) and the lowest 2025 (1,133 t). Its efficiency percentile within the type went from 74 in 2020 to 53 in 2021 (lower is more efficient). Of the 3 comparable vessels listed below with a 2025 return, 0 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 | 1,133 | 357 | — | 270 | 139 | 372.9 | 10.0 | not ranked |
| 2021 | 6,643 | 2,094 | 23,566 | 1,803 | 1,240 | 281.9 | 8.7 | 53 |
| 2020 | 8,558 | 2,692 | 23,228 | 1,886 | 853 | 368.4 | 12.9 | 74 |
Vessel particulars
- IMO number
- 9311048
- Previously reported as
- RIDGEBURY ACACIA, OKEE ULF
- Ship type
- Oil tanker
- Flag state
- Liberia per EU MRV 2025
- Port of registry
- Monrovia MRV 2025
- Ice class
- IC
- Technical efficiency (design)
- EEXI (4.79 gCO₂/t·nm)
- Efficiency ranking
- Not ranked: transport work below the floor (2025)
- Verifier
- DNV, Germany
- Accreditation
- VS-16026-01
- Compliance document issued
- 2026-03-03
- Compliance document expires
- 2027-06-30
Reported CO₂ by year
Reported CO₂ in 2025 was 86.8% lower than in 2020, for EU/EEA voyages only. No return is recorded for 2022, 2023, 2024, so the series has gaps.
From 2021 to 2025, emissions fell 83.0% and CO₂ per nautical mile rose 32.3%.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
- 1,150 t
- Methane (CH₄)
- 0.02 t
- Nitrous oxide (N₂O)
- 0.06 t
- Under EU ETS
- 654 t, 58% of total
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2020 | Nippon Kaiji Kyokai | Japan |
| 2025 | DNV | Germany |
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.
This page draws on 3 MRV reporting years, 1 of 5 vessel particulars and a name history. Not found in the sources for this vessel: an efficiency ranking, 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.