Most Emission-Efficient Bulk Carriers
Ships ranked by AER (Annual Efficiency Ratio) — grams of CO₂ emitted per tonne of deadweight carried one nautical mile (g CO₂/dwt·nm), the IMO carbon-intensity metric behind the CII rating — from official EU MRV emissions data for reporting year 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.
| # | Vessel | Size (DWT) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 2351 |
ARISTON BULKER
IMO 9875109
|
37,594 | 2020 |
5.2
|
D |
| 2352 |
IDON
IMO 9478755
|
55,498 | 2009 |
5.2
|
D |
| 2353 |
DORA
IMO 9387360
|
53,473 | 2009 |
5.2
|
D |
| 2354 |
WASP
IMO 9520613
|
58,105 | 2012 |
5.2
|
D |
| 2355 |
FEDERAL DEE
IMO 9805269
|
34,492 | 2018 |
5.2
|
D |
| 2356 |
STAR BRIGHT
IMO 9507788
|
55,569 | 2010 |
5.2
|
D |
| 2357 |
SHENG XING HAI
IMO 9416537
|
57,291 | 2009 |
5.2
|
D |
| 2358 |
SE CARDI
IMO 9846316
|
37,717 | 2019 |
5.2
|
D |
| 2359 |
SARONIC SPIRIT
IMO 9725392
|
38,947 | 2015 |
5.2
|
D |
| 2360 |
FRIEDRICH SCHULTE
IMO 9841940
|
39,851 | 2015 |
5.2
|
D |
| 2361 |
MINNEAPOLIS MIYO
IMO 9875721
|
38,209 | 2020 |
5.2
|
D |
| 2362 |
INASA
IMO 9891012
|
38,129 | 2020 |
5.2
|
D |
| 2363 |
HOPA
IMO 9684213
|
63,301 | 2013 |
5.2
|
D |
| 2364 |
MORNING ORCHID
IMO 9844241
|
37,340 | 2019 |
5.2
|
D |
| 2365 |
GOLDEN GRAINS
IMO 9777723
|
37,597 | 2018 |
5.2
|
D |
| 2366 |
GARGANEY
IMO 9983475
|
39,830 | 2024 |
5.2
|
D |
| 2367 |
IRIS K
IMO 9748435
|
37,806 | 2016 |
5.2
|
D |
| 2368 |
AMILLA
IMO 9498561
|
58,443 | 2011 |
5.2
|
D |
| 2369 |
FEDERAL HUNTER
IMO 9205938
|
36,563 | 2001 |
5.2
|
D |
| 2370 |
XIN HAI TONG 65
IMO 9551698
|
56,778 | 2012 |
5.2
|
D |
| 2371 |
PORTO DOLICHA
IMO 9687083
|
55,975 | 2014 |
5.2
|
D |
| 2372 |
HONEVER
IMO 9533438
|
61,664 | 2010 |
5.3
|
D |
| 2373 |
LUNE B
IMO 9163491
|
45,621 | 1998 |
5.3
|
D |
| 2374 |
DAIWAN LEADER
IMO 9796535
|
34,442 | 2018 |
5.3
|
D |
| 2375 |
THOR INFINITY
IMO 9238466
|
52,383 | 2002 |
5.3
|
D |
| 2376 |
FEDERAL OSHIMA
IMO 9200330
|
36,563 | 1999 |
5.3
|
D |
| 2377 |
AMOY CENTURY
IMO 9797008
|
61,438 | 2017 |
5.3
|
D |
| 2378 |
MAGDA P
IMO 9476692
|
57,015 | 2010 |
5.3
|
D |
| 2379 |
ILIA
IMO 9490650
|
58,018 | 2009 |
5.3
|
D |
| 2380 |
LEFKES
IMO 9658783
|
33,398 | 2014 |
5.3
|
D |
| 2381 |
FEDERAL MAYUMI
IMO 9529578
|
35,885 | 2012 |
5.3
|
D |
| 2382 |
KANAVU BENEFIT
IMO 9912361
|
37,292 | 2021 |
5.3
|
D |
| 2383 |
LIMNOS
IMO 9566552
|
56,671 | 2010 |
5.3
|
D |
| 2384 |
SANITA S
IMO 9237888
|
46,683 | 2004 |
5.3
|
D |
| 2385 |
WL UGLICH
IMO 9674373
|
37,500 | 2014 |
5.3
|
D |
| 2386 |
GREAT COSMOS
IMO 9792917
|
38,649 | 2018 |
5.3
|
D |
| 2387 |
SOLIDARNOSC
IMO 9708069
|
39,092 | 2018 |
5.3
|
D |
| 2388 |
YASA TULIP
IMO 9786073
|
40,238 | 2023 |
5.3
|
D |
| 2389 |
SEA PEARL
IMO 9478896
|
55,589 | 2009 |
5.3
|
D |
| 2390 |
EASTBOURNE
IMO 9979462
|
40,547 | 2024 |
5.3
|
D |
| 2391 |
SHENG WANG HAI
IMO 9416549
|
57,208 | 2009 |
5.3
|
D |
| 2392 |
SW MISTRAL I
IMO 9520948
|
58,110 | 2011 |
5.3
|
D |
| 2393 |
UNITY MELODY
IMO 9607007
|
55,705 | 2012 |
5.3
|
D |
| 2394 |
ADASTAR
IMO 9701231
|
34,334 | 2015 |
5.3
|
D |
| 2395 |
XIN HAI TONG 53
IMO 9632301
|
56,620 | 2013 |
5.3
|
D |
| 2396 |
FEDERAL TAMBO
IMO 9644495
|
55,160 | 2013 |
5.3
|
D |
| 2397 |
BIRD OF PARADISE
IMO 1014618
|
40,259 | 2024 |
5.3
|
D |
| 2398 |
PANEMORFI
IMO 9660097
|
61,430 | 2013 |
5.3
|
D |
| 2399 |
QING PING SHAN
IMO 9741504
|
63,474 | 2015 |
5.3
|
D |
| 2400 |
MANGUSTA
IMO 9726853
|
33,393 | 2015 |
5.3
|
D |
Which engines power the greenest fleets?
The main engine is the single largest CO₂ source on board — typically well over 80% of a ship's emissions come from propulsion. We aggregated this ranking the other way around: every engine design is scored by the measured carbon intensity of the vessels carrying it, licensee-built units merged under their design brand. The verdict from the 2025 data — modern dual-fuel designs like MAN B&W's ME-GI and WinGD's X-DF families, together with EGR/SCR-abated and ultra-long-stroke G-type engines, consistently power the most emission-friendly ships in service.
AER (Annual Efficiency Ratio) = annual CO₂ emissions ÷ (deadweight × distance sailed), the IMO carbon-intensity metric used for CII ratings. It is built only from measured CO₂, distance and deadweight — not the self-reported cargo transport-work figure, which is unreliable. Implausible outliers (top 2% per segment) are excluded. Grade A–E reflects each vessel's rank within its segment. Source: EMSA THETIS-MRV.