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 |
|---|---|---|---|---|---|
| 200 |
VASSOS
IMO 9933183
|
82,018 | 2022 |
2.8
|
A |
| 206 |
DELOS
IMO 9585601
|
175,157 | 2012 |
2.8
|
A |
| 205 |
KATAGALAN ACE
IMO 9950521
|
82,680 | 2023 |
2.8
|
A |
| 204 |
CAPE AQUA
IMO 9538402
|
178,055 | 2009 |
2.8
|
A |
| 203 |
VITA UNITY
IMO 9902275
|
82,545 | 2021 |
2.8
|
A |
| 202 |
INDIAN PARTNERSHIP
IMO 9521409
|
181,012 | 2014 |
2.8
|
A |
| 209 |
GOLDEN TIDE
IMO 9977165
|
84,996 | 2025 |
2.8
|
A |
| 208 |
NAVIOS MARS
IMO 9747950
|
181,259 | 2016 |
2.8
|
A |
| 210 |
NORD KARAS
IMO 9552991
|
82,354 | 2016 |
2.8
|
A |
| 207 |
ALPHA DIGNITY
IMO 9462811
|
176,296 | 2011 |
2.8
|
A |
| 211 |
SAKIZAYA HERO
IMO 9780134
|
80,962 | 2016 |
2.8
|
A |
| 212 |
CAPE ELEKTRA
IMO 9527922
|
179,430 | 2011 |
2.8
|
A |
| 216 |
HELLASSHIP
IMO 9574236
|
181,325 | 2012 |
2.8
|
A |
| 214 |
DEFENDER
IMO 9949663
|
82,680 | 2023 |
2.8
|
A |
| 213 |
GINA OLDENDORFF
IMO 9942732
|
182,002 | 2023 |
2.8
|
A |
| 215 |
FRONTIER ROSE
IMO 9487988
|
179,266 | 2012 |
2.8
|
A |
| 217 |
FORTUNE
IMO 9737838
|
182,620 | 2016 |
2.8
|
A |
| 219 |
TRINITY ISLAND
IMO 9971903
|
82,777 | 2023 |
2.8
|
A |
| 218 |
MINIMATA
IMO 9952464
|
82,202 | 2023 |
2.8
|
A |
| 221 |
WOOYANG ARES
IMO 9826433
|
62,625 | 2018 |
2.8
|
A |
| 220 |
JOSCO LIUZHOU
IMO 9934204
|
64,231 | 2022 |
2.8
|
A |
| 222 |
MARAN UNITY
IMO 9729166
|
180,000 | 2015 |
2.8
|
A |
| 225 |
KEEPER
IMO 9313395
|
174,674 | 2005 |
2.8
|
A |
| 224 |
SIAN
IMO 9942639
|
82,450 | 2023 |
2.8
|
A |
| 226 |
CAPE XL
IMO 9590826
|
181,458 | 2011 |
2.8
|
A |
| 223 |
LOWLANDS KAMI
IMO 9968346
|
82,459 | 2024 |
2.8
|
A |
| 228 |
BERGE NIMBA
IMO 9467677
|
175,949 | 2010 |
2.8
|
A |
| 227 |
KATE
IMO 9427304
|
176,000 | 2011 |
2.8
|
A |
| 229 |
CEMTEX DOMINANCE
IMO 9919383
|
99,990 | 2022 |
2.8
|
A |
| 230 |
CAPE BREEZE
IMO 9518919
|
180,203 | 2010 |
2.8
|
A |
| 231 |
XING CHANG HAI
IMO 9758492
|
81,824 | 2018 |
2.9
|
A |
| 234 |
SQUIRESHIP
IMO 9391646
|
170,000 | 2010 |
2.9
|
A |
| 233 |
STAR EXPLORER
IMO 9989948
|
82,362 | 2024 |
2.9
|
A |
| 232 |
MARAN MERCHANT
IMO 9458690
|
179,718 | 2007 |
2.9
|
A |
| 236 |
CHAMPIONSHIP
IMO 9403516
|
180,000 | 2011 |
2.9
|
A |
| 235 |
SCARLETT
IMO 9484792
|
176,000 | 2012 |
2.9
|
A |
| 238 |
HUBERTUS OLDENDORFF
IMO 9731602
|
209,095 | 2016 |
2.9
|
A |
| 237 |
ULTRA LYNX
IMO 9811048
|
81,607 | 2018 |
2.9
|
A |
| 239 |
TROODOS AIR
IMO 9698226
|
84,849 | 2016 |
2.9
|
A |
| 240 |
VELOS STAR
IMO 9728124
|
81,846 | 2015 |
2.9
|
A |
| 243 |
KATAGALAN BRAVE
IMO 9950533
|
82,719 | 2023 |
2.9
|
A |
| 242 |
TAI KNIGHT
IMO 9884265
|
82,042 | 2022 |
2.9
|
A |
| 241 |
NICOLAUS SCHULTE
IMO 9966312
|
82,004 | 2023 |
2.9
|
A |
| 247 |
BBG LAIBIN
IMO 9929041
|
82,022 | 2022 |
2.9
|
A |
| 246 |
CAPE LEGACY
IMO 9589401
|
180,161 | 2011 |
2.9
|
A |
| 245 |
FRONTIER EXPLORER
IMO 9511959
|
179,376 | 2010 |
2.9
|
A |
| 244 |
CSSC LE HAVRE
IMO 9853931
|
120,000 | 2021 |
2.9
|
A |
| 250 |
FJ RUBY
IMO 9840881
|
85,188 | 2019 |
2.9
|
A |
| 249 |
LOWLANDS CONCORD
IMO 9959412
|
82,778 | 2024 |
2.9
|
A |
| 248 |
AMABIKO
IMO 9971898
|
82,835 | 2023 |
2.9
|
A |
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.