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 |
|---|---|---|---|---|---|
| 2701 |
SUPER ARSENAL
IMO 9316933
|
29,858 | 2005 |
5.9
|
D |
| 2702 |
ARDENNES
IMO 9646699
|
36,062 | 2013 |
5.9
|
D |
| 2703 |
EASTERN MERCY
IMO 9543677
|
57,454 | 2011 |
5.9
|
D |
| 2704 |
POSEIDON S
IMO 9405485
|
53,482 | 2008 |
5.9
|
D |
| 2705 |
EQUITY
IMO 9577628
|
37,071 | 2013 |
5.9
|
D |
| 2706 |
BUNUN HERO
IMO 9738894
|
37,811 | 2015 |
5.9
|
D |
| 2707 |
AVRA I
IMO 9569932
|
57,080 | 2010 |
5.9
|
D |
| 2708 |
POMORZE
IMO 9346823
|
38,981 | 2008 |
5.9
|
D |
| 2709 |
SEASTAR VALIANT
IMO 9462768
|
34,328 | 2012 |
5.9
|
D |
| 2710 |
SV ADELAIDE
IMO 9529504
|
61,687 | 2012 |
5.9
|
D |
| 2711 |
OMURTAG
IMO 9605839
|
56,709 | 2012 |
5.9
|
D |
| 2712 |
POLES
IMO 9254989
|
50,326 | 2002 |
5.9
|
D |
| 2713 |
IZUMO HERMES
IMO 9852212
|
37,301 | 2020 |
5.9
|
D |
| 2714 |
NEW SIHAM
IMO 9197882
|
31,025 | 1999 |
5.9
|
D |
| 2715 |
MANGUSTA
IMO 9726853
|
33,393 | 2015 |
5.9
|
D |
| 2716 |
MABROKAH
IMO 9163489
|
45,572 | 1997 |
5.9
|
D |
| 2717 |
HIROKI
IMO 9181120
|
46,620 | 1999 |
5.9
|
D |
| 2718 |
FEDERAL KUMANO
IMO 9244257
|
36,489 | 2003 |
5.9
|
D |
| 2719 |
HAMBURG PEARL
IMO 9747247
|
39,359 | 2016 |
6.0
|
D |
| 2720 |
STAR HARRIER
IMO 9941544
|
40,393 | 2022 |
6.0
|
D |
| 2721 |
FOUR BUTTERFLY
IMO 9480708
|
36,454 | 2007 |
6.0
|
D |
| 2722 |
FEDERAL YAMASKA
IMO 9609665
|
37,144 | 2013 |
6.0
|
D |
| 2723 |
SUPRA MONARCH
IMO 9479046
|
55,628 | 2011 |
6.0
|
D |
| 2724 |
FEDERAL YOSHINO
IMO 9218416
|
32,845 | 2001 |
6.0
|
D |
| 2725 |
LUCA
IMO 9166211
|
31,764 | 1998 |
6.0
|
D |
| 2726 |
CHUMERNA
IMO 9621871
|
37,854 | 2012 |
6.0
|
D |
| 2727 |
CS JADEN
IMO 9660061
|
38,101 | 2013 |
6.0
|
D |
| 2728 |
MYKONOS SEAS
IMO 9491240
|
56,840 | 2011 |
6.0
|
D |
| 2729 |
TBC PRIME
IMO 9618501
|
38,529 | 2011 |
6.0
|
D |
| 2730 |
ALENTEJO
IMO 9626118
|
36,041 | 2013 |
6.0
|
D |
| 2731 |
ANGY R
IMO 9530955
|
36,903 | 2011 |
6.0
|
D |
| 2732 |
SEMIHA-AHMET-M
IMO 9381873
|
42,704 | 2007 |
6.0
|
D |
| 2733 |
CL HEIDI
IMO 9720952
|
63,571 | 2016 |
6.0
|
D |
| 2734 |
KANCHANA NAREE
IMO 9434735
|
56,920 | 2011 |
6.0
|
D |
| 2735 |
FLORA K
IMO 9708538
|
35,236 | 2013 |
6.0
|
D |
| 2736 |
CS JENNA
IMO 9748409
|
37,713 | 2015 |
6.0
|
D |
| 2737 |
STRENGTH
IMO 9413420
|
75,500 | 2009 |
6.0
|
D |
| 2738 |
TRIDENT STAR
IMO 9707637
|
57,836 | 2015 |
6.0
|
D |
| 2739 |
NORDIC INCHEON
IMO 9649873
|
35,817 | 2018 |
6.0
|
D |
| 2740 |
SIRIUS
IMO 9541887
|
37,705 | 2011 |
6.0
|
D |
| 2741 |
LADY VENEZIA
IMO 9641821
|
28,207 | 2013 |
6.0
|
D |
| 2742 |
ABYSSINIAN
IMO 9646728
|
36,063 | 2011 |
6.0
|
D |
| 2743 |
AGIOS NEKTARIOS I
IMO 9515759
|
56,722 | 2010 |
6.0
|
D |
| 2744 |
UNICORN
IMO 9595931
|
56,739 | 2012 |
6.0
|
D |
| 2745 |
ATLANTIS TRADE
IMO 9620994
|
37,227 | 2013 |
6.0
|
D |
| 2746 |
DAIWAN KALON
IMO 9709324
|
34,327 | 2016 |
6.0
|
D |
| 2747 |
FLORA SCHULTE
IMO 9841938
|
39,874 | 2015 |
6.0
|
D |
| 2748 |
PHATRA NAREE
IMO 9649861
|
35,882 | 2017 |
6.0
|
D |
| 2749 |
SAFEEN AL NASR
IMO 9612296
|
36,546 | 2013 |
6.0
|
D |
| 2750 |
ROMANDIE
IMO 9542829
|
35,774 | 2010 |
6.0
|
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 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.