General cargo ship · Portugal flag · built 2009
BOLTEN SYMI: CO₂ emissions 2018–2025
IMO 9427380 EU ETS8 reporting years
- CO₂ reported 2025
- 6,156 t
- Fuel burned
- 1,945 t
- Time at sea
- 2,976 h
- Emitted at berth
- 9% of total
- Share of year under way
- 34%
- Gross tonnage
- 15,861
BOLTEN SYMI against its type
Built in 2009, it is 2 years newer than the median general cargo ship on this register, which was built in 2007 (2,852 vessels with a known build year). At 15,861 gross tonnage it is larger than 74% of the other 2,665 general cargo ships with a recorded tonnage. It is one of 187 general cargo ships here under the Portugal flag, 6.1% of the 3,081 on the register. Its MRV returns name it HELEN BOLTEN for 2018, SYMI for 2019–2021 and BOLTEN SYMI for 2022–2025. The reported port of registry changed: MAJURO (2022), then Madeira (2023–2025).
Its 6,156 t of CO₂ for 2025 is 2.2 times the median of 2,820 t among the 2,469 general cargo ships on this register that reported for 2025. Per nautical mile it emitted 195.7 kg CO₂, 1.6 times the type median of 122.2 kg. It logged 2,976 hours at sea against a median of 3,044 hours for its type that year. 8.7% of its 2025 emissions were at berth; the median for general cargo ships was 4.3%. Across 8 years with reported emissions, the highest was 2023 (8,350 t) and the lowest 2020 (1,549 t). Its efficiency percentile within the type went from 21 in 2018 to 18 in 2024 (lower is more efficient). Of the 7 comparable vessels 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 | 6,156 | 1,945 | — | 2,976 | 534 | 195.7 | — | — |
| 2024 | 7,719 | 2,464 | 35,587 | 3,465 | 370 | 216.9 | 12.8 | 18 |
| 2023 | 8,350 | 2,656 | 37,096 | 3,642 | 301 | 225.1 | 14.2 | 28 |
| 2022 | 7,812 | 2,483 | 36,193 | 3,333 | 640 | 215.8 | 12.4 | 16 |
| 2021 | 3,380 | 1,075 | 17,405 | 1,576 | 172 | 194.2 | 13.1 | 0 |
| 2020 | 1,549 | 492 | 9,078 | 700 | 32 | 170.7 | 14.6 | 8 |
| 2019 | 5,009 | 1,604 | 25,098 | 2,455 | 204 | 199.6 | 11.3 | 5 |
| 2018 | 8,061 | 2,542 | 36,522 | 3,945 | 413 | 220.7 | 17.4 | 21 |
Vessel particulars
- IMO number
- 9427380
- Previously reported as
- HELEN BOLTEN, SYMI
- Ship type
- General cargo ship
- Gross tonnage
- 15,861
- Length overall
- 157.2 m
- Beam
- 26.8 m
- Year built
- 2009
- Flag state
- Portugal per EU MRV 2025
- Port of registry
- Madeira MRV 2025
- Technical efficiency (design)
- EEXI (7.91 gCO₂/t·nm)
- Verifier
- RINA Services Spa, Italy
- Accreditation
- 002O
- Compliance document issued
- 2026-03-20
- Compliance document expires
- 2027-06-30
Efficiency against its own type2024
Position 59 of 321 qualifying general cargo ships by EEOI, at the 18th percentile. The dashed line is the type median, 23.6; this vessel reported 12.8.
EEOI divides emissions by transport work, which for this vessel and year was 600,710,506 tonne-miles over 35,587 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 23.6% lower than in 2018, for EU/EEA voyages only.
From 2024 to 2025, emissions fell 20.2% and CO₂ per nautical mile fell 9.8%.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
- 6,252 t
- Methane (CH₄)
- 0.10 t
- Nitrous oxide (N₂O)
- 0.35 t
- Under EU ETS
- 4,527 t, 74% of total
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2018 | VERIFAVIA (UK) LTD | United Kingdom |
| 2020 | ICS Verification Services Single Member P.C. | Greece |
| 2023 | RINA Services Spa | Italy |
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 2018–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0).
This page draws on 8 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.