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 |
|---|---|---|---|---|---|
| 3301 |
LABRADOR
IMO 9415222
|
30,899 | 2010 |
7.8
|
E |
| 3302 |
MIEDWIE
IMO 9393448
|
30,481 | 2010 |
7.8
|
E |
| 3303 |
EKATERINA
IMO 9158458
|
27,174 | 2000 |
7.8
|
E |
| 3304 |
YANGZE 32
IMO 9617612
|
47,020 | 2012 |
7.8
|
E |
| 3305 |
PRINCESS MANISSA
IMO 9084217
|
22,020 | 1994 |
7.8
|
E |
| 3306 |
PIRRIHIOS
IMO 9553804
|
28,375 | 2010 |
7.8
|
E |
| 3307 |
MOTHER M
IMO 9626613
|
35,856 | 2012 |
7.8
|
E |
| 3308 |
DEMA
IMO 9416446
|
34,000 | 2011 |
7.8
|
E |
| 3309 |
SEA HORSE
IMO 9528029
|
32,525 | 2011 |
7.8
|
E |
| 3310 |
NH ELIF
IMO 9509255
|
22,108 | 2009 |
7.8
|
E |
| 3311 |
SIRIUS
IMO 9541887
|
37,705 | 2011 |
7.8
|
E |
| 3312 |
BAM TRITON
IMO 9414474
|
30,009 | 2012 |
7.9
|
E |
| 3313 |
WINTER SEA
IMO 9639787
|
35,251 | 2014 |
7.9
|
E |
| 3314 |
ELAR TRADER
IMO 9409534
|
37,782 | 2010 |
7.9
|
E |
| 3315 |
PUNKT
IMO 9296327
|
28,671 | 2006 |
7.9
|
E |
| 3316 |
SAINT DIMITRIOS
IMO 9486398
|
33,788 | 2011 |
7.9
|
E |
| 3317 |
CS CELESTE
IMO 9670418
|
38,737 | 2014 |
7.9
|
E |
| 3318 |
SELIN-M
IMO 9178551
|
31,770 | 1998 |
7.9
|
E |
| 3319 |
BRAVE LEADER
IMO 9033505
|
22,242 | 1992 |
7.9
|
E |
| 3320 |
MERRY M
IMO 9450650
|
36,438 | 2010 |
7.9
|
E |
| 3321 |
TORRENT
IMO 9415210
|
30,890 | 2010 |
7.9
|
E |
| 3322 |
TUNDRA
IMO 9415208
|
30,892 | 2009 |
7.9
|
E |
| 3323 |
AURORA PRIMA
IMO 9485887
|
34,394 | 2011 |
7.9
|
E |
| 3324 |
KALI KARDIA
IMO 9437529
|
32,688 | 2009 |
7.9
|
E |
| 3325 |
GANNET S
IMO 9316995
|
16,730 | 2007 |
7.9
|
E |
| 3326 |
ELIKI
IMO 9470325
|
28,228 | 2011 |
8.0
|
E |
| 3327 |
SUN PROFIT
IMO 9524542
|
55,691 | 2009 |
8.0
|
E |
| 3328 |
ITHACA PATIENCE
IMO 9550199
|
28,349 | 2010 |
8.0
|
E |
| 3329 |
TROON
IMO 9326304
|
18,830 | 2005 |
8.0
|
E |
| 3330 |
SION STAR
IMO 9595163
|
37,152 | 2011 |
8.0
|
E |
| 3331 |
TUFTY
IMO 9393163
|
30,803 | 2009 |
8.0
|
E |
| 3332 |
ALEXANDROS III
IMO 9575436
|
32,631 | 2010 |
8.0
|
E |
| 3333 |
MKK MADRID
IMO 9104811
|
21,583 | 1995 |
8.0
|
E |
| 3334 |
CAPE DOUKATO
IMO 9717254
|
28,230 | 2014 |
8.0
|
E |
| 3335 |
GLADIATOR
IMO 9445033
|
28,341 | 2008 |
8.0
|
E |
| 3336 |
ROXETTE
IMO 9433896
|
21,118 | 2008 |
8.1
|
E |
| 3337 |
FITNES
IMO 9490105
|
33,169 | 2010 |
8.1
|
E |
| 3338 |
NEW SPIRIT
IMO 9604770
|
28,383 | 2012 |
8.1
|
E |
| 3339 |
NESTOR I
IMO 9599016
|
32,312 | 2011 |
8.1
|
E |
| 3340 |
CELESTE
IMO 9588419
|
34,295 | 2012 |
8.1
|
E |
| 3341 |
PIGMI
IMO 9470571
|
33,918 | 2011 |
8.1
|
E |
| 3342 |
GR ATHENS
IMO 9584205
|
32,503 | 2012 |
8.1
|
E |
| 3343 |
MEDIQUEEN
IMO 9476410
|
17,149 | 2007 |
8.1
|
E |
| 3344 |
NEW VICTORY
IMO 9159050
|
26,516 | 1997 |
8.1
|
E |
| 3345 |
SHOVELER
IMO 9459979
|
30,928 | 2009 |
8.1
|
E |
| 3346 |
RUMA
IMO 9652387
|
26,091 | 2013 |
8.2
|
E |
| 3347 |
IPPOKRATIS
IMO 9585663
|
37,056 | 2011 |
8.2
|
E |
| 3348 |
AGIOS PORFYRIOS
IMO 9244075
|
20,002 | 2002 |
8.2
|
E |
| 3349 |
WELL DREAM
IMO 9303364
|
32,776 | 2005 |
8.2
|
E |
| 3350 |
MARIA H
IMO 9571650
|
34,938 | 2013 |
8.2
|
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.