Passenger ship (Cruise Passenger ship) · Italy flag · built 2014
COSTA DIADEMA: CO₂ emissions 2018–2025
IMO 9636888 MMSI 247353700EU ETS8 reporting years
- CO₂ reported 2025
- 51,086 t
- Fuel burned
- 16,198 t
- Time at sea
- 3,177 h
- Emitted at berth
- 11% of total
- Share of year under way
- 36%
- Gross tonnage
- 133,019
COSTA DIADEMA against its type
Built in 2014, it is 4 years newer than the median cruise ship on this register, which was built in 2010 (195 vessels with a known build year). At 133,019 gross tonnage it is larger than 81% of the other 177 cruise ships with a recorded tonnage. It is one of 19 cruise ships here under the Italy flag, 9.4% of the 202 on the register. The same builder is recorded for 132 other vessels here, 60 of them cruise ships. Costa Cruises is linked to 22 vessels on this register. The reported port of registry changed: Genova (2018–2022), then Genoa (2023–2025).
Its 51,086 t of CO₂ for 2025 is 1.6 times the median of 31,269 t among the 200 cruise ships on this register that reported for 2025. Per nautical mile it emitted 1,055.2 kg CO₂, 28% above the type median of 821.3 kg. It logged 3,177 hours at sea against a median of 3,133 hours for its type that year. 10.7% of its 2025 emissions were at berth; the median for cruise ships was 15.1%. Across 8 years with reported emissions, the highest was 2018 (89,733 t) and the lowest 2020 (22,532 t). Of the 5 sister ships 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 | 51,086 | 16,198 | — | 3,177 | 5,467 | 1,055.2 | — | — |
| 2024 | 67,475 | 21,476 | — | 4,061 | 7,982 | 1,076.2 | — | — |
| 2023 | 69,301 | 22,062 | — | 3,976 | 9,379 | 1,238.2 | — | — |
| 2022 | 63,655 | 20,254 | — | 3,690 | 6,155 | 1,120.3 | — | — |
| 2021 | 45,423 | 14,433 | — | 1,925 | 20,587 | 1,903.9 | — | — |
| 2020 | 22,532 | 7,175 | — | 5,404 | 15,309 | 3,265.6 | — | — |
| 2019 | 72,923 | 23,330 | — | 4,658 | 13,719 | 1,114.5 | — | — |
| 2018 | 89,733 | 28,757 | — | 6,349 | 15,198 | 1,247.0 | — | — |
Vessel particulars
- IMO number
- 9636888
- MMSI
- 247353700
- Call sign
- IBCX
- Gross tonnage
- 133,019
- Length overall
- 304.0 m
- Beam
- 50.0 m
- Year built
- 2014
- Flag state
- Italy per EU MRV 2025
- Builder
- Fincantieri
- Port of registry
- Genoa MRV 2025
- Technical efficiency (design)
- EEXI (8.28 gCO₂/t·nm)
- Operator
- Costa Cruises
- Verifier
- DNV, Germany
- Accreditation
- VS-16026-01
- Compliance document issued
- 2026-03-05
- Compliance document expires
- 2027-06-30
Reported CO₂ by year
Reported CO₂ in 2025 was 43.1% lower than in 2018, for EU/EEA voyages only.
From 2024 to 2025, emissions fell 24.3% and CO₂ per nautical mile fell 1.9%.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
- 51,881 t
- Methane (CH₄)
- 0.81 t
- Nitrous oxide (N₂O)
- 2.92 t
- Under EU ETS
- 48,188 t, 94% of total
Observed movementsAIS · Norwegian waters
- First seen
- 02 Jul 2025
- Last seen
- 27 Jul 2026
- Days observed
- 73
- Positions
- 7,862
- Median speed
- 16.3 kn
Its recorded positions span 58.0°N to 62.8°N and 4.4°E to 8.4°E.
400 hourly points from 7,862 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.
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2018 | RINA Services Spa | Italy |
| 2022 | RINA HELLAS LTD | Greece |
| 2023 | 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 2018–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0) and Wikimedia Commons.
- Movements: Norwegian Coastal Administration open AIS extract.
This page draws on 8 MRV reporting years, 5 of 5 vessel particulars, AIS movements in Norwegian waters and a licensed photograph. Not found in the sources for this vessel: an efficiency ranking, 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.