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 2024. 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 |
CENTURY EMERALD
IMO 9726841
|
16,181 | 2015 |
8.2
|
E |
| 3402 |
ATALANTE
IMO 9363168
|
23,641 | 2008 |
8.2
|
E |
| 3403 |
LADY AILLAR
IMO 9550278
|
28,496 | 2010 |
8.2
|
E |
| 3404 |
MASTRO MITROS
IMO 9228071
|
45,601 | 2001 |
8.2
|
E |
| 3405 |
RESOURCE
IMO 9487031
|
31,775 | 2010 |
8.2
|
E |
| 3406 |
SENECA
IMO 9856725
|
9,287 | 2020 |
8.2
|
E |
| 3407 |
RESKO
IMO 9393462
|
30,372 | 2010 |
8.3
|
E |
| 3408 |
DANNY BOY
IMO 9324722
|
28,386 | 2005 |
8.3
|
E |
| 3409 |
GLORIOUS SEA
IMO 9370977
|
24,781 | 2006 |
8.3
|
E |
| 3410 |
PALAU
IMO 9261035
|
31,837 | 2003 |
8.3
|
E |
| 3411 |
STAR WESTPORT
IMO 9705988
|
63,334 | 2015 |
8.3
|
E |
| 3412 |
LADY LAVELA
IMO 9675561
|
28,316 | 2015 |
8.3
|
E |
| 3413 |
MACCOA
IMO 9413913
|
30,898 | 2009 |
8.3
|
E |
| 3414 |
RAZONI
IMO 9086526
|
29,292 | 1996 |
8.3
|
E |
| 3415 |
SABEEL STAR
IMO 9257058
|
27,101 | 2003 |
8.4
|
E |
| 3416 |
ROYAL STAR
IMO 9223813
|
27,028 | 2001 |
8.4
|
E |
| 3417 |
LAPIS LAZULI
IMO 9450662
|
37,773 | 2010 |
8.4
|
E |
| 3418 |
ALKADI BEY
IMO 9085675
|
21,964 | 1995 |
8.4
|
E |
| 3419 |
TAO ACE
IMO 9639696
|
25,037 | 2013 |
8.4
|
E |
| 3420 |
KALLIOPI S
IMO 9450844
|
34,402 | 2012 |
8.4
|
E |
| 3421 |
UNICORN OL
IMO 9998262
|
13,460 | 2024 |
8.4
|
E |
| 3422 |
RUI FU BANG
IMO 9609847
|
35,212 | 2011 |
8.4
|
E |
| 3423 |
ERTEA
IMO 9546198
|
54,876 | 2009 |
8.5
|
E |
| 3424 |
BOW ARM
IMO 9558737
|
35,106 | 2009 |
8.5
|
E |
| 3425 |
ROYAL O
IMO 9084229
|
21,955 | 1994 |
8.5
|
E |
| 3426 |
GLOBAL CROWN
IMO 9579406
|
38,145 | 2012 |
8.5
|
E |
| 3427 |
JU XI
IMO 9567441
|
56,556 | 2011 |
8.5
|
E |
| 3428 |
BELTNES
IMO 9432206
|
33,173 | 2009 |
8.5
|
E |
| 3429 |
SUPER SARKAS
IMO 9221633
|
28,495 | 2002 |
8.5
|
E |
| 3430 |
CECELA S
IMO 9227857
|
19,225 | 2000 |
8.5
|
E |
| 3431 |
NIMET TORLAK
IMO 9282948
|
18,820 | 2003 |
8.5
|
E |
| 3432 |
LORD HASSAN
IMO 9146895
|
23,581 | 1996 |
8.5
|
E |
| 3433 |
AGIOS PORFYRIOS
IMO 9244075
|
20,002 | 2002 |
8.5
|
E |
| 3434 |
TUNDRA
IMO 9415208
|
30,892 | 2009 |
8.5
|
E |
| 3435 |
APHRODITE M
IMO 9450832
|
34,399 | 2011 |
8.5
|
E |
| 3436 |
TUFTY
IMO 9393163
|
30,803 | 2009 |
8.5
|
E |
| 3437 |
BRANT
IMO 9393151
|
30,777 | 2008 |
8.5
|
E |
| 3438 |
PAN BONITA
IMO 9626015
|
38,140 | 2012 |
8.5
|
E |
| 3439 |
GREENWING
IMO 9230921
|
26,722 | 2002 |
8.5
|
E |
| 3440 |
EIRINI S
IMO 9595369
|
34,039 | 2012 |
8.5
|
E |
| 3441 |
FITNES
IMO 9490105
|
33,169 | 2010 |
8.5
|
E |
| 3442 |
CHISE BULKER
IMO 9667722
|
33,355 | 2014 |
8.6
|
E |
| 3443 |
BRIGHTON
IMO 9966817
|
64,701 | 2024 |
8.6
|
E |
| 3444 |
ANDEAN
IMO 9413925
|
30,770 | 2009 |
8.6
|
E |
| 3445 |
LADY LILLY
IMO 9642021
|
28,397 | 2013 |
8.6
|
E |
| 3446 |
COSCO TAIHANGSHAN
IMO 9418327
|
31,846 | 2010 |
8.6
|
E |
| 3447 |
PIRRIHIOS
IMO 9553804
|
28,375 | 2010 |
8.6
|
E |
| 3448 |
SEASTAR EXPLORER
IMO 9498303
|
34,569 | 2006 |
8.6
|
E |
| 3449 |
LILA HOUSTON
IMO 9559676
|
32,580 | 2010 |
8.6
|
E |
| 3450 |
AGORA
IMO 9128154
|
27,364 | 1997 |
8.7
|
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 2024 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.