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 |
|---|---|---|---|---|---|
| 2201 |
SHINSUNG ACCORD
IMO 9606041
|
37,063 | 2015 |
5.0
|
D |
| 2202 |
STAR CHALLENGER
IMO 9632997
|
61,462 | 2012 |
5.0
|
D |
| 2203 |
NAFISA JAHAN
IMO 9303091
|
56,070 | 2006 |
5.1
|
D |
| 2204 |
BC MIRABEL
IMO 9531662
|
58,186 | 2013 |
5.1
|
D |
| 2205 |
PAN QUEEN
IMO 9487419
|
56,933 | 2011 |
5.1
|
D |
| 2206 |
AFRICAN GANNET
IMO 9749233
|
37,806 | 2018 |
5.1
|
D |
| 2207 |
HONG RUN 16
IMO 9317420
|
52,905 | 2006 |
5.1
|
D |
| 2208 |
BERGE BEN NEVIS
IMO 9782974
|
37,681 | 2017 |
5.1
|
D |
| 2209 |
WADI ALKARM
IMO 9460760
|
80,533 | 2011 |
5.1
|
D |
| 2210 |
AFRICAN NIGHTHAWK
IMO 9646895
|
40,481 | 2014 |
5.1
|
D |
| 2211 |
HUPEH
IMO 9714264
|
39,773 | 2016 |
5.1
|
D |
| 2212 |
ROSTRUM SOLAR
IMO 9941623
|
40,071 | 2024 |
5.1
|
D |
| 2213 |
BLUE FIN
IMO 9607277
|
56,780 | 2011 |
5.1
|
D |
| 2214 |
SETO HARMONY
IMO 9881160
|
39,943 | 2020 |
5.1
|
D |
| 2215 |
GREY LUNA
IMO 9578775
|
56,697 | 2011 |
5.1
|
D |
| 2216 |
MED LIGURIA
IMO 9604811
|
51,156 | 2012 |
5.1
|
D |
| 2217 |
MANDARIN CHINA
IMO 9569243
|
56,778 | 2011 |
5.1
|
D |
| 2218 |
ROSTRUM HAMBURG
IMO 9997268
|
40,012 | 2024 |
5.1
|
D |
| 2219 |
LALLY SCHULTE
IMO 9725897
|
43,457 | 2017 |
5.1
|
D |
| 2220 |
PORTSMOUTH
IMO 9979474
|
40,547 | 2024 |
5.1
|
D |
| 2221 |
DENSA EAGLE
IMO 9432488
|
55,089 | 2006 |
5.1
|
D |
| 2222 |
STAR HARRIER
IMO 9941544
|
40,393 | 2022 |
5.1
|
D |
| 2223 |
LIBRA-XS
IMO 9282742
|
52,441 | 2003 |
5.1
|
D |
| 2224 |
CRANE
IMO 9441283
|
57,809 | 2010 |
5.1
|
D |
| 2225 |
LUCKY BELLA
IMO 9286970
|
76,263 | 2005 |
5.1
|
D |
| 2226 |
KRAIT
IMO 9622837
|
56,100 | 2013 |
5.1
|
D |
| 2227 |
SIDER VANCOUVER
IMO 9919541
|
37,722 | 2022 |
5.1
|
D |
| 2228 |
CRIMSON SAPPHIRE
IMO 1014163
|
40,435 | 2024 |
5.1
|
D |
| 2229 |
MAI TAI
IMO 9709221
|
38,792 | 2015 |
5.1
|
D |
| 2230 |
EUCALYPTUS
IMO 9832456
|
36,896 | 2019 |
5.1
|
D |
| 2231 |
SPAR CAPELLA
IMO 9490844
|
58,000 | 2011 |
5.1
|
D |
| 2232 |
KAMARI
IMO 9412634
|
53,822 | 2011 |
5.1
|
D |
| 2233 |
FEDERAL MICHIGAN
IMO 9975416
|
34,763 | 2024 |
5.1
|
D |
| 2234 |
NORD NORFOLK
IMO 9984479
|
40,232 | 2024 |
5.1
|
D |
| 2235 |
PAIWAN ACE
IMO 9984405
|
39,500 | 2024 |
5.1
|
D |
| 2236 |
SUPER RICE
IMO 9621792
|
56,615 | 2013 |
5.1
|
D |
| 2237 |
ILIANA
IMO 9490715
|
58,018 | 2010 |
5.1
|
D |
| 2238 |
FRIDA BULKER
IMO 9968970
|
40,161 | 2023 |
5.1
|
D |
| 2239 |
SIDER HARMONY
IMO 9780964
|
38,581 | 2020 |
5.1
|
D |
| 2240 |
MEDITERRANEAN SPIRIT
IMO 9725407
|
38,858 | 2016 |
5.1
|
D |
| 2241 |
YANGZE 35
IMO 9617600
|
47,091 | 2011 |
5.1
|
D |
| 2242 |
OCEAN PERA
IMO 9712955
|
55,837 | 2015 |
5.1
|
D |
| 2243 |
PORT SHANGHAI
IMO 9423528
|
58,600 | 2009 |
5.1
|
D |
| 2244 |
WU YANG FORTUNE
IMO 9294214
|
52,050 | 2004 |
5.1
|
D |
| 2245 |
LEFKADA
IMO 9767546
|
37,951 | 2016 |
5.1
|
D |
| 2246 |
MYKONOS SEAS
IMO 9491240
|
56,840 | 2011 |
5.1
|
D |
| 2247 |
REIWA BREEZE
IMO 9757802
|
37,721 | 2016 |
5.1
|
D |
| 2248 |
SILVER LADY
IMO 9279367
|
50,329 | 2003 |
5.1
|
D |
| 2249 |
LINK AMICI
IMO 9728394
|
34,398 | 2015 |
5.1
|
D |
| 2250 |
PAPA JOHN
IMO 9555149
|
56,543 | 2010 |
5.1
|
D |
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.