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 |
|---|---|---|---|---|---|
| 3401 |
ATHOS
IMO 9320336
|
30,618 | 2007 |
8.8
|
E |
| 3402 |
REK ROYAL
IMO 9229867
|
20,035 | 2002 |
8.9
|
E |
| 3403 |
BADGER ISLAND
IMO 9578294
|
58,086 | 2013 |
8.9
|
E |
| 3404 |
LADY DIVINA
IMO 9354052
|
18,901 | 2007 |
8.9
|
E |
| 3405 |
TRADE
IMO 9425942
|
58,096 | 2011 |
8.9
|
E |
| 3406 |
WICKO
IMO 9393474
|
30,379 | 2010 |
8.9
|
E |
| 3407 |
QANUX BENEFIT
IMO 1043841
|
13,394 | 2025 |
8.9
|
E |
| 3408 |
MILOS
IMO 9138446
|
24,045 | 1997 |
8.9
|
E |
| 3409 |
FETHIYE-M
IMO 9485899
|
34,421 | 2011 |
9.0
|
E |
| 3410 |
SCOTLAND BAY
IMO 9276200
|
28,446 | 2004 |
9.0
|
E |
| 3411 |
LEGEND
IMO 9587685
|
24,319 | 2010 |
9.0
|
E |
| 3412 |
NIMET TORLAK
IMO 9282948
|
18,820 | 2003 |
9.0
|
E |
| 3413 |
SALVINIA
IMO 9524815
|
18,969 | 2009 |
9.0
|
E |
| 3414 |
DRAWSKO
IMO 9393450
|
30,487 | 2010 |
9.0
|
E |
| 3415 |
OS KANO 35
IMO 9174505
|
35,360 | 1998 |
9.1
|
E |
| 3416 |
SEA BRIDLE
IMO 9047001
|
26,446 | 1993 |
9.1
|
E |
| 3417 |
MAMRY
IMO 9496264
|
30,206 | 2012 |
9.1
|
E |
| 3418 |
STAR EXPLORER
IMO 9498303
|
34,569 | 2006 |
9.1
|
E |
| 3419 |
ASIAN FRONTIER
IMO 9392145
|
16,656 | 2009 |
9.1
|
E |
| 3420 |
SIDER AMBOS
IMO 9805295
|
19,998 | 2017 |
9.1
|
E |
| 3421 |
NIKE
IMO 9545508
|
35,957 | 2010 |
9.1
|
E |
| 3422 |
CADIZ
IMO 9643738
|
16,461 | 2013 |
9.1
|
E |
| 3423 |
AFRICAN JACARANDA
IMO 9354076
|
18,909 | 2007 |
9.2
|
E |
| 3424 |
C-WISE
IMO 9522817
|
28,509 | 2009 |
9.2
|
E |
| 3425 |
ATAYAL STAR
IMO 9606962
|
16,805 | 2012 |
9.2
|
E |
| 3426 |
LADY KATERINA
IMO 9571416
|
33,794 | 2011 |
9.2
|
E |
| 3427 |
MBC DAISY
IMO 9609902
|
15,332 | 2011 |
9.3
|
E |
| 3428 |
HUANGYAN SPIRIT
IMO 9644263
|
22,996 | 2013 |
9.3
|
E |
| 3429 |
MS MARIA
IMO 9403841
|
21,118 | 2007 |
9.3
|
E |
| 3430 |
PARDUS
IMO 9490260
|
16,213 | 2010 |
9.3
|
E |
| 3431 |
MOAYAD Y
IMO 9135482
|
23,524 | 1996 |
9.4
|
E |
| 3432 |
GANOSAYA
IMO 9151400
|
18,369 | 1997 |
9.5
|
E |
| 3433 |
LADY NAEIMA
IMO 9223643
|
16,213 | 2000 |
9.5
|
E |
| 3434 |
LADY AYANA
IMO 9196395
|
27,797 | 1999 |
9.5
|
E |
| 3435 |
SANDERA
IMO 9560326
|
14,687 | 2010 |
9.5
|
E |
| 3436 |
AILEEN
IMO 9214252
|
18,320 | 2000 |
9.6
|
E |
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.