Ro-pax ship · Italy flag · built 1985
MARIELLA: CO₂ emissions 2018–2025
IMO 8320573 EU ETS8 reporting years
- CO₂ reported 2025
- 28,513 t
- Fuel burned
- 8,946 t
- Time at sea
- 3,346 h
- Emitted at berth
- 14% of total
- Share of year under way
- 38%
- Gross tonnage
- 37,799
MARIELLA against its type
Built in 1985, it is 15 years older than the median ro-pax ship on this register, which was built in 2000 (483 vessels with a known build year). At 37,799 gross tonnage it is larger than 85% of the other 470 ro-pax ships with a recorded tonnage. It is one of 84 ro-pax ships here under the Italy flag, 17.0% of the 493 on the register. The same builder is recorded for 19 other vessels here, 11 of them ro-pax ships. Its MRV returns name it MARIELLA for 2018–2020 and MEGA REGINA for 2021–2025. The reported port of registry changed: Mariehamn (2018–2020), then Genova (2021–2025).
Its 28,513 t of CO₂ for 2025 is close to the median of 30,062 t among the 417 ro-pax ships on this register that reported for 2025. Per nautical mile it emitted 562.8 kg CO₂, 20% above the type median of 467.6 kg. It logged 3,346 hours at sea against a median of 4,243 hours for its type that year. 14.0% of its 2025 emissions were at berth; the median for ro-pax ships was 6.7%. Across 8 years with reported emissions, the highest was 2018 (48,557 t) and the lowest 2021 (16,328 t). Of the 3 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 | 28,513 | 8,946 | — | 3,346 | 3,978 | 562.8 | — | — |
| 2024 | 37,405 | 11,969 | — | 4,487 | 3,513 | 533.6 | — | — |
| 2023 | 33,432 | 10,703 | — | 4,314 | 2,245 | 512.7 | — | — |
| 2022 | 22,799 | 7,302 | — | 2,658 | 1,455 | 530.0 | — | — |
| 2021 | 16,328 | 5,214 | — | 1,342 | 4,043 | 750.1 | — | — |
| 2020 | 18,976 | 6,013 | — | 1,937 | 4,790 | 626.2 | — | — |
| 2019 | 47,111 | 14,951 | — | 6,315 | 2,870 | 476.8 | — | — |
| 2018 | 48,557 | 15,410 | — | 6,331 | 3,240 | 489.5 | — | — |
Vessel particulars
- IMO number
- 8320573
- Previously reported as
- MEGA REGINA
- Ship type
- Ro-pax ship
- Gross tonnage
- 37,799
- Length overall
- 175.7 m
- Year built
- 1985
- Flag state
- Italy per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Finland. The flag shown is from the newest official source, the EU MRV return for 2025. - Builder
- Wärtsilä
- Port of registry
- Genova MRV 2025
- Ice class
- IA Super
- Technical efficiency (design)
- EIV (3.45 gCO₂/t·nm)
- Verifier
- RINA Services Spa, Italy
- Accreditation
- 002O
- Compliance document issued
- 2026-04-14
- Compliance document expires
- 2027-06-30
Reported CO₂ by year
Reported CO₂ in 2025 was 41.3% lower than in 2018, for EU/EEA voyages only.
From 2024 to 2025, emissions fell 23.8% and CO₂ per nautical mile rose 5.5%.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
- 28,953 t
- Methane (CH₄)
- 0.45 t
- Nitrous oxide (N₂O)
- 1.61 t
- Under EU ETS
- 28,513 t, 100% of total
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2018 | VERIFAVIA (UK) LTD | United Kingdom |
| 2020 | NORMEC VERIFAVIA SAS | France |
| 2021 | 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) and Wikimedia Commons.
This page draws on 8 MRV reporting years, 5 of 5 vessel particulars, a name history and a licensed photograph. Not found in the sources for this vessel: an efficiency ranking, AIS movements in Norwegian waters, 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.