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 |
|---|---|---|---|---|---|
| 2801 |
FEDERAL SKEENA
IMO 9595890
|
37,168 | 2012 |
6.0
|
E |
| 2802 |
DENSA SEA LION
IMO 9649079
|
36,765 | 2013 |
6.0
|
E |
| 2803 |
IMAVERE
IMO 9612325
|
36,746 | 2012 |
6.0
|
E |
| 2804 |
DAIWAN HERO
IMO 9709336
|
34,376 | 2016 |
6.0
|
E |
| 2805 |
VELA
IMO 9330628
|
53,565 | 2007 |
6.1
|
E |
| 2806 |
OCEAN JOY
IMO 9668300
|
38,114 | 2013 |
6.1
|
E |
| 2807 |
TIRYANDAFIL
IMO 9320996
|
54,243 | 2007 |
6.1
|
E |
| 2808 |
AFRICAN QUEEN
IMO 9389930
|
55,000 | 2007 |
6.1
|
E |
| 2809 |
ZBB SERENITY
IMO 9486570
|
37,302 | 2006 |
6.1
|
E |
| 2810 |
CS CALVINA
IMO 9542532
|
37,456 | 2011 |
6.1
|
E |
| 2811 |
LAGO DI CANCANO
IMO 9659787
|
37,500 | 2014 |
6.1
|
E |
| 2812 |
AFRICAN STORK
IMO 9733272
|
40,481 | 2015 |
6.1
|
E |
| 2813 |
FILIA
IMO 9490868
|
58,000 | 2011 |
6.1
|
E |
| 2814 |
FEDERAL SAKURA
IMO 9288291
|
32,550 | 2005 |
6.1
|
E |
| 2815 |
COREWISE OL
IMO 9636395
|
37,059 | 2013 |
6.1
|
E |
| 2816 |
PARALOS
IMO 9325099
|
30,439 | 2006 |
6.1
|
E |
| 2817 |
MERAKLIS
IMO 9227819
|
50,296 | 2001 |
6.1
|
E |
| 2818 |
TOP MARINE
IMO 9995351
|
39,850 | 2024 |
6.1
|
E |
| 2819 |
DENSA PUMA
IMO 9649108
|
36,722 | 2013 |
6.1
|
E |
| 2820 |
ISABELLE G
IMO 9285938
|
37,193 | 2004 |
6.1
|
E |
| 2821 |
ABYSSINIAN
IMO 9646728
|
36,063 | 2011 |
6.1
|
E |
| 2822 |
OCCITAN LISTRAC
IMO 9549372
|
29,229 | 2009 |
6.1
|
E |
| 2823 |
PRINCESS SHAIMAA
IMO 9620138
|
32,046 | 2013 |
6.1
|
E |
| 2824 |
TOMINI SIROCCO
IMO 9711743
|
38,780 | 2013 |
6.1
|
E |
| 2825 |
ELEOVRYTISSA
IMO 9486594
|
37,096 | 2012 |
6.1
|
E |
| 2826 |
NISA NAREE
IMO 9700029
|
39,247 | 2015 |
6.1
|
E |
| 2827 |
JALMA TOPIC
IMO 9309655
|
51,966 | 2006 |
6.1
|
E |
| 2828 |
AMIRA SAHAR
IMO 9527958
|
38,477 | 2012 |
6.1
|
E |
| 2829 |
AYMAR GALACTIC
IMO 9330630
|
53,460 | 2007 |
6.1
|
E |
| 2830 |
JIU HUA HAI
IMO 9466520
|
53,377 | 2008 |
6.1
|
E |
| 2831 |
SIDER BEAR
IMO 9657856
|
40,484 | 2013 |
6.1
|
E |
| 2832 |
FOXTROT
IMO 9580144
|
38,688 | 2012 |
6.1
|
E |
| 2833 |
ODYSSEAS
IMO 9595187
|
37,138 | 2011 |
6.2
|
E |
| 2834 |
FEDERAL SWIFT
IMO 9595905
|
37,140 | 2012 |
6.2
|
E |
| 2835 |
AFRICAN KALMIA
IMO 9666431
|
28,000 | 2016 |
6.2
|
E |
| 2836 |
SEA LADY
IMO 9266188
|
50,246 | 2003 |
6.2
|
E |
| 2837 |
MEHMET DADAYLI
IMO 9749984
|
34,484 | 2019 |
6.2
|
E |
| 2838 |
MANSOUR M
IMO 9296274
|
33,733 | 2005 |
6.2
|
E |
| 2839 |
CLARABELLE
IMO 9695004
|
37,430 | 2014 |
6.2
|
E |
| 2840 |
DESERT GLORY
IMO 9543691
|
57,412 | 2011 |
6.2
|
E |
| 2841 |
KASZUBY
IMO 9346847
|
38,980 | 2008 |
6.2
|
E |
| 2842 |
KOSZALIN
IMO 9594236
|
37,930 | 2012 |
6.2
|
E |
| 2843 |
GENCO PYRENEES
IMO 9511832
|
58,018 | 2010 |
6.2
|
E |
| 2844 |
PISTI
IMO 9456367
|
56,898 | 2011 |
6.2
|
E |
| 2845 |
POLESIE
IMO 9488097
|
38,056 | 2009 |
6.2
|
E |
| 2846 |
AYMAR GRACE
IMO 9395252
|
53,406 | 2009 |
6.2
|
E |
| 2847 |
LILA HOUSTON
IMO 9559676
|
32,580 | 2010 |
6.2
|
E |
| 2848 |
NJ AIO
IMO 9267089
|
33,528 | 2004 |
6.2
|
E |
| 2849 |
SZARE SZEREGI
IMO 9708057
|
39,000 | 2017 |
6.2
|
E |
| 2850 |
EIDER
IMO 9415143
|
29,860 | 2010 |
6.2
|
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.