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 |
|---|---|---|---|---|---|
| 2951 |
CLIPPER SPEY
IMO 9587219
|
33,985 | 2011 |
6.5
|
E |
| 2952 |
NEW LIBERTY
IMO 9221645
|
28,471 | 2002 |
6.5
|
E |
| 2953 |
UBC THESSALONIKI
IMO 9718454
|
37,567 | 2015 |
6.5
|
E |
| 2954 |
AQUA REGIA
IMO 9199842
|
29,952 | 1999 |
6.5
|
E |
| 2955 |
ALLEGRA
IMO 9519169
|
35,118 | 2011 |
6.5
|
E |
| 2956 |
WESTERN MAPLE
IMO 9587154
|
32,493 | 2010 |
6.5
|
E |
| 2957 |
DARYA SATI
IMO 9752424
|
64,000 | 2018 |
6.5
|
E |
| 2958 |
DSM NORWICH
IMO 9274551
|
32,754 | 2004 |
6.5
|
E |
| 2959 |
AG VALOR
IMO 9312327
|
28,510 | 2004 |
6.5
|
E |
| 2960 |
AP DRZIC
IMO 9331684
|
53,414 | 2009 |
6.5
|
E |
| 2961 |
INASE
IMO 9445148
|
28,429 | 2008 |
6.5
|
E |
| 2962 |
SEA FAITH
IMO 9655420
|
33,343 | 2014 |
6.5
|
E |
| 2963 |
NYMPHI
IMO 9615030
|
28,214 | 2012 |
6.5
|
E |
| 2964 |
VEGA CAROLINE
IMO 9587166
|
32,491 | 2011 |
6.5
|
E |
| 2965 |
BELASITZA
IMO 9498262
|
30,696 | 2011 |
6.5
|
E |
| 2966 |
CHARILAOS S
IMO 9493925
|
75,039 | 2011 |
6.5
|
E |
| 2967 |
MALLIKA NAREE
IMO 9354739
|
30,195 | 2008 |
6.6
|
E |
| 2968 |
SATURNIA
IMO 9725380
|
38,947 | 2015 |
6.6
|
E |
| 2969 |
IVORY GULL
IMO 9475715
|
32,929 | 2009 |
6.6
|
E |
| 2970 |
JASMUND
IMO 9696840
|
38,868 | 2015 |
6.6
|
E |
| 2971 |
NOTA APP
IMO 9249271
|
53,098 | 2003 |
6.6
|
E |
| 2972 |
AT 27
IMO 9136539
|
26,551 | 1997 |
6.6
|
E |
| 2973 |
SEALION
IMO 9598282
|
32,860 | 2012 |
6.6
|
E |
| 2974 |
JULIETTA D
IMO 9590618
|
37,202 | 2010 |
6.6
|
E |
| 2975 |
JAOHAR UK
IMO 9302463
|
27,112 | 2003 |
6.6
|
E |
| 2976 |
URSA MINOR
IMO 9711767
|
40,097 | 2013 |
6.6
|
E |
| 2977 |
FEDERAL YELLOWSTONE
IMO 9609653
|
37,153 | 2013 |
6.6
|
E |
| 2978 |
ARKLOW SPIRIT
IMO 9649536
|
34,905 | 2013 |
6.6
|
E |
| 2979 |
LILA NOLA
IMO 9621041
|
35,501 | 2012 |
6.6
|
E |
| 2980 |
STRATEGIC SYNERGY
IMO 9648087
|
40,000 | 2011 |
6.6
|
E |
| 2981 |
LEFKES
IMO 9658783
|
33,398 | 2014 |
6.6
|
E |
| 2982 |
SIGMA PIONEER
IMO 9543249
|
31,800 | 2011 |
6.6
|
E |
| 2983 |
AP SVETI VLAHO
IMO 9331696
|
53,529 | 2009 |
6.6
|
E |
| 2984 |
SERENITY
IMO 9544762
|
36,599 | 2011 |
6.6
|
E |
| 2985 |
IRYDA
IMO 9180384
|
34,946 | 1999 |
6.6
|
E |
| 2986 |
ACACIA
IMO 9597642
|
33,677 | 2011 |
6.6
|
E |
| 2987 |
CHIOS VICTORY
IMO 9680243
|
36,612 | 2015 |
6.6
|
E |
| 2988 |
PUCK
IMO 9594250
|
37,930 | 2012 |
6.6
|
E |
| 2989 |
NIKATOR
IMO 9544372
|
28,336 | 2009 |
6.6
|
E |
| 2990 |
OSLEEN
IMO 9278739
|
33,658 | 2004 |
6.6
|
E |
| 2991 |
TRANSMERIDIAN
IMO 9577757
|
35,853 | 2011 |
6.6
|
E |
| 2992 |
FOUR TURANDOT
IMO 9480710
|
36,460 | 2007 |
6.6
|
E |
| 2993 |
RESOLUTE BAY
IMO 9626314
|
36,798 | 2012 |
6.6
|
E |
| 2994 |
PORT ALICE
IMO 9311402
|
33,505 | 2005 |
6.6
|
E |
| 2995 |
WU YI HAI
IMO 9488217
|
53,443 | 2008 |
6.6
|
E |
| 2996 |
REK GRACE
IMO 9445203
|
28,342 | 2008 |
6.6
|
E |
| 2997 |
SF CHALISA
IMO 9502726
|
35,283 | 2009 |
6.6
|
E |
| 2998 |
UBC TACOMA
IMO 9737888
|
37,332 | 2018 |
6.6
|
E |
| 2999 |
ATLANTIS DISCOVERY
IMO 9544736
|
36,781 | 2010 |
6.6
|
E |
| 3000 |
LUDOGORETS
IMO 9415155
|
29,998 | 2010 |
6.6
|
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 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.