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 |
|---|---|---|---|---|---|
| 3101 |
AG VALIANT
IMO 9173018
|
23,986 | 1999 |
6.9
|
E |
| 3102 |
MAJESTIC NOOR
IMO 9138642
|
27,827 | 1997 |
6.9
|
E |
| 3103 |
MARYAM D
IMO 9740445
|
35,000 | 2016 |
6.9
|
E |
| 3104 |
CAPE
IMO 9498224
|
31,639 | 2010 |
6.9
|
E |
| 3105 |
KNIDOS-M
IMO 9354791
|
42,704 | 2008 |
6.9
|
E |
| 3106 |
SKYFALL
IMO 9582427
|
34,990 | 2012 |
6.9
|
E |
| 3107 |
NAV NEHA
IMO 9563392
|
35,051 | 2010 |
6.9
|
E |
| 3108 |
ATLANTIS TRADE
IMO 9620994
|
37,227 | 2013 |
6.9
|
E |
| 3109 |
YAMAN
IMO 9504944
|
23,127 | 2008 |
6.9
|
E |
| 3110 |
ECO BUSHFIRE
IMO 9561344
|
32,081 | 2011 |
6.9
|
E |
| 3111 |
GOLDEN MALAK
IMO 9578995
|
30,361 | 2010 |
6.9
|
E |
| 3112 |
HORIZON
IMO 9323637
|
30,803 | 2007 |
6.9
|
E |
| 3113 |
SEA STAR 74
IMO 9109378
|
46,638 | 1995 |
6.9
|
E |
| 3114 |
SEAPEARL
IMO 9594468
|
32,956 | 2013 |
6.9
|
E |
| 3115 |
PUNA
IMO 9546784
|
29,974 | 2010 |
6.9
|
E |
| 3116 |
DSM HARBOUR
IMO 9268928
|
33,745 | 2004 |
6.9
|
E |
| 3117 |
GLOBAL HARMONY
IMO 9473573
|
34,529 | 2010 |
6.9
|
E |
| 3118 |
CHARLIE
IMO 9595383
|
35,139 | 2011 |
6.9
|
E |
| 3119 |
OSPREY S
IMO 9300843
|
30,570 | 2007 |
6.9
|
E |
| 3120 |
MIKE BAY
IMO 9481958
|
36,447 | 2010 |
6.9
|
E |
| 3121 |
ALITHIA
IMO 9595840
|
35,062 | 2012 |
6.9
|
E |
| 3122 |
YC FORTITUDE
IMO 9587178
|
32,480 | 2011 |
6.9
|
E |
| 3123 |
STENTOR
IMO 9590785
|
28,367 | 2011 |
6.9
|
E |
| 3124 |
NEW LIBERTY
IMO 9221645
|
28,471 | 2002 |
6.9
|
E |
| 3125 |
WADOWICE II
IMO 9488102
|
38,985 | 2010 |
6.9
|
E |
| 3126 |
BARBRO G
IMO 9546796
|
29,975 | 2010 |
6.9
|
E |
| 3127 |
ASTRO CASTOR
IMO 9767314
|
37,347 | 2016 |
7.0
|
E |
| 3128 |
GENESSIS
IMO 9668336
|
28,197 | 2013 |
7.0
|
E |
| 3129 |
OSMAN BEY
IMO 9111357
|
27,321 | 1995 |
7.0
|
E |
| 3130 |
PACIFIC OCEAN
IMO 9467562
|
36,009 | 2011 |
7.0
|
E |
| 3131 |
LYULIN
IMO 9498248
|
30,686 | 2011 |
7.0
|
E |
| 3132 |
DIONE
IMO 9598086
|
28,253 | 2011 |
7.0
|
E |
| 3133 |
HELGA
IMO 9444912
|
28,358 | 2008 |
7.0
|
E |
| 3134 |
EC FATMA
IMO 9509243
|
22,108 | 2009 |
7.0
|
E |
| 3135 |
ECO ANGELBAY
IMO 9385166
|
32,165 | 2009 |
7.0
|
E |
| 3136 |
LOUISA BOLTEN
IMO 9406049
|
30,765 | 2009 |
7.0
|
E |
| 3137 |
AQUA REGIA
IMO 9199842
|
29,952 | 1999 |
7.0
|
E |
| 3138 |
ARKLOW SPRAY
IMO 9649548
|
34,919 | 2014 |
7.0
|
E |
| 3139 |
BRONCO
IMO 9675717
|
28,220 | 2014 |
7.0
|
E |
| 3140 |
DAIWAN WISDOM
IMO 9427134
|
31,833 | 2010 |
7.0
|
E |
| 3141 |
LORD HASSAN
IMO 9146895
|
23,581 | 1996 |
7.0
|
E |
| 3142 |
VALERIO
IMO 9244037
|
27,112 | 2003 |
7.0
|
E |
| 3143 |
PRINCESS SHAHD
IMO 9392092
|
33,387 | 2009 |
7.0
|
E |
| 3144 |
AP ZATON
IMO 9412294
|
37,729 | 2010 |
7.0
|
E |
| 3145 |
STARNES
IMO 9858424
|
40,742 | 2020 |
7.0
|
E |
| 3146 |
PL FAITH
IMO 9595204
|
36,787 | 2011 |
7.0
|
E |
| 3147 |
IOANNA D
IMO 9634969
|
35,000 | 2012 |
7.0
|
E |
| 3148 |
OUTLANDER
IMO 9218337
|
45,526 | 2000 |
7.0
|
E |
| 3149 |
ASB BONITO
IMO 9015577
|
29,330 | 2001 |
7.0
|
E |
| 3150 |
ORIENT PEARL
IMO 9450727
|
34,402 | 2007 |
7.0
|
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.