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 |
|---|---|---|---|---|---|
| 3151 |
JETSTREAM
IMO 9528184
|
34,563 | 2012 |
7.0
|
E |
| 3152 |
BIANCA
IMO 9467615
|
33,773 | 2013 |
7.0
|
E |
| 3153 |
ORIENT PEARL
IMO 9450727
|
34,402 | 2007 |
7.0
|
E |
| 3154 |
BUNUN WISDOM
IMO 9628568
|
38,168 | 2012 |
7.0
|
E |
| 3155 |
MDS ARIADNE
IMO 9482770
|
34,439 | 2012 |
7.0
|
E |
| 3156 |
NAMA
IMO 9404455
|
37,852 | 2010 |
7.0
|
E |
| 3157 |
CALOBRA
IMO 9739082
|
35,422 | 2015 |
7.0
|
E |
| 3158 |
LEFTERIS T
IMO 9621170
|
36,006 | 2012 |
7.0
|
E |
| 3159 |
SEASTAR VICTORY
IMO 9612246
|
35,320 | 2013 |
7.0
|
E |
| 3160 |
ARAWANA
IMO 9640401
|
32,318 | 2012 |
7.1
|
E |
| 3161 |
CHARLES
IMO 9595175
|
37,193 | 2011 |
7.1
|
E |
| 3162 |
ARKONA
IMO 9404443
|
37,852 | 2010 |
7.1
|
E |
| 3163 |
F LINE
IMO 9320324
|
30,587 | 2007 |
7.1
|
E |
| 3164 |
DESERT SPRING
IMO 9543768
|
57,437 | 2012 |
7.1
|
E |
| 3165 |
NANA LEEN
IMO 9113850
|
28,300 | 1995 |
7.1
|
E |
| 3166 |
CLIPPER SARA
IMO 9609653
|
37,153 | 2013 |
7.1
|
E |
| 3167 |
GOLDEN EMAN
IMO 9576014
|
30,347 | 2010 |
7.1
|
E |
| 3168 |
GOLF
IMO 9580120
|
37,856 | 2011 |
7.1
|
E |
| 3169 |
AMALEA
IMO 9470818
|
28,451 | 2008 |
7.1
|
E |
| 3170 |
KALLISTI
IMO 9449340
|
37,763 | 2009 |
7.1
|
E |
| 3171 |
TONY SMITH
IMO 9576569
|
57,000 | 2011 |
7.1
|
E |
| 3172 |
FJORDNES
IMO 9880855
|
40,693 | 2021 |
7.1
|
E |
| 3173 |
FAIA G
IMO 9550424
|
28,418 | 2009 |
7.1
|
E |
| 3174 |
DS MADRID
IMO 9647887
|
30,912 | 2013 |
7.1
|
E |
| 3175 |
AGHIA MARINA
IMO 9577604
|
37,163 | 2012 |
7.1
|
E |
| 3176 |
POOLE
IMO 9385221
|
19,230 | 2008 |
7.1
|
E |
| 3177 |
TRUE MARINER
IMO 9599822
|
38,239 | 2011 |
7.1
|
E |
| 3178 |
BRABUS
IMO 9211559
|
28,355 | 2000 |
7.1
|
E |
| 3179 |
ANDEAN
IMO 9413925
|
30,770 | 2009 |
7.1
|
E |
| 3180 |
QUEEN GHAIDAA
IMO 9295567
|
32,621 | 2004 |
7.1
|
E |
| 3181 |
ALEA
IMO 9550266
|
28,319 | 2009 |
7.1
|
E |
| 3182 |
ARIETTA
IMO 9545065
|
35,083 | 2012 |
7.1
|
E |
| 3183 |
SEASTAR VALIANT
IMO 9462768
|
34,328 | 2012 |
7.1
|
E |
| 3184 |
HASOONLIT
IMO 9498298
|
35,995 | 2011 |
7.1
|
E |
| 3185 |
SERENITY
IMO 9544762
|
36,599 | 2011 |
7.2
|
E |
| 3186 |
REA
IMO 9497165
|
32,755 | 2010 |
7.2
|
E |
| 3187 |
HANDY PERTH
IMO 9628128
|
35,177 | 2013 |
7.2
|
E |
| 3188 |
OCCITAN PAUILLAC
IMO 9483451
|
29,231 | 2008 |
7.2
|
E |
| 3189 |
CINNAMON
IMO 9239800
|
26,737 | 2003 |
7.2
|
E |
| 3190 |
NORD STARK
IMO 9691591
|
28,368 | 2014 |
7.2
|
E |
| 3191 |
DELTA
IMO 9595395
|
35,147 | 2012 |
7.2
|
E |
| 3192 |
INASE
IMO 9445148
|
28,429 | 2008 |
7.2
|
E |
| 3193 |
AMANDA C
IMO 9482782
|
34,446 | 2012 |
7.2
|
E |
| 3194 |
BLACKY
IMO 9393149
|
30,802 | 2008 |
7.2
|
E |
| 3195 |
AMMOS
IMO 9573804
|
28,219 | 2011 |
7.2
|
E |
| 3196 |
HONOUR
IMO 9456379
|
57,050 | 2010 |
7.2
|
E |
| 3197 |
LADY ZANDAVI
IMO 9573969
|
28,374 | 2011 |
7.2
|
E |
| 3198 |
GANT FLAIR
IMO 9554066
|
28,339 | 2010 |
7.2
|
E |
| 3199 |
NILOS
IMO 9311153
|
75,880 | 2006 |
7.2
|
E |
| 3200 |
MATIN BEY
IMO 9082623
|
26,477 | 1996 |
7.2
|
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.