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 |
|---|---|---|---|---|---|
| 2551 |
CHAYANEE NAREE
IMO 9613434
|
56,547 | 2012 |
5.6
|
D |
| 2552 |
FRIEDERIKE
IMO 9436769
|
57,369 | 2011 |
5.6
|
D |
| 2553 |
PROTECTOR ST. RAPHAEL
IMO 9583615
|
56,873 | 2010 |
5.6
|
D |
| 2554 |
BUNUN KALON
IMO 9768033
|
37,653 | 2018 |
5.6
|
D |
| 2555 |
ZHE HAI 525
IMO 9567518
|
57,282 | 2011 |
5.6
|
D |
| 2556 |
SW NORTH WIND I
IMO 9514004
|
55,989 | 2009 |
5.6
|
D |
| 2557 |
STELLAR LADY
IMO 9574004
|
51,201 | 2011 |
5.6
|
D |
| 2558 |
KARAMEL
IMO 9316921
|
35,287 | 2005 |
5.6
|
D |
| 2559 |
IASOS
IMO 9233882
|
52,817 | 2001 |
5.6
|
D |
| 2560 |
ASTON TRADER
IMO 9808675
|
39,486 | 2017 |
5.6
|
D |
| 2561 |
AN DING HAI
IMO 9751303
|
38,800 | 2017 |
5.6
|
D |
| 2562 |
FEDERAL KUSHIRO
IMO 9284702
|
32,762 | 2004 |
5.6
|
D |
| 2563 |
SAKARYA
IMO 9257199
|
29,905 | 2002 |
5.6
|
D |
| 2564 |
BONTRUP AMSTERDAM
IMO 8110681
|
59,954 | 1984 |
5.6
|
D |
| 2565 |
STRATEGIC ALLIANCE
IMO 9648075
|
40,000 | 2014 |
5.6
|
D |
| 2566 |
MARO K
IMO 9425904
|
58,117 | 2010 |
5.6
|
D |
| 2567 |
GRAND DIONYSUS
IMO 9590228
|
56,804 | 2012 |
5.6
|
D |
| 2568 |
LARUS
IMO 9241346
|
50,209 | 2002 |
5.6
|
D |
| 2569 |
FEDERAL WELLAND
IMO 9205926
|
36,563 | 2000 |
5.6
|
D |
| 2570 |
FEDERAL SWIFT
IMO 9595905
|
37,140 | 2012 |
5.6
|
D |
| 2571 |
ARMONIA
IMO 9638496
|
58,609 | 2013 |
5.7
|
D |
| 2572 |
YASA TULIP
IMO 9786073
|
40,238 | 2023 |
5.7
|
D |
| 2573 |
STELLAR ALAZANI
IMO 9708265
|
28,180 | 2014 |
5.7
|
D |
| 2574 |
NIKOS N
IMO 9412646
|
53,815 | 2011 |
5.7
|
D |
| 2575 |
MP ULTRAMAX 1
IMO 9703590
|
63,339 | 2013 |
5.7
|
D |
| 2576 |
ANSAC PRIDE
IMO 9619737
|
37,094 | 2013 |
5.7
|
D |
| 2577 |
G PUTUO
IMO 9491238
|
56,780 | 2011 |
5.7
|
D |
| 2578 |
XIN HAI TONG 22
IMO 9453250
|
56,779 | 2011 |
5.7
|
D |
| 2579 |
ISHIZUCHI STAR
IMO 9811919
|
37,637 | 2017 |
5.7
|
D |
| 2580 |
FEDERAL SEVERN
IMO 9606821
|
37,169 | 2012 |
5.7
|
D |
| 2581 |
COMMON CALYPSO
IMO 9594705
|
57,002 | 2011 |
5.7
|
D |
| 2582 |
OCEAN JOY
IMO 9668300
|
38,114 | 2013 |
5.7
|
D |
| 2583 |
FEDERAL FRONTIER
IMO 9866768
|
34,492 | 2021 |
5.7
|
D |
| 2584 |
SPAR URSA
IMO 9490856
|
58,000 | 2011 |
5.7
|
D |
| 2585 |
KUAIBANGHAI 18
IMO 9330678
|
53,679 | 2009 |
5.7
|
D |
| 2586 |
BAI IZMIR
IMO 9855410
|
39,492 | 2015 |
5.7
|
D |
| 2587 |
LUCILIA C
IMO 9561813
|
35,009 | 2011 |
5.7
|
D |
| 2588 |
PRAETORIUS
IMO 9470856
|
28,345 | 2008 |
5.7
|
D |
| 2589 |
DENSA FALCON
IMO 9649081
|
36,752 | 2013 |
5.7
|
D |
| 2590 |
LOWLANDS ALMA
IMO 9959436
|
40,030 | 2023 |
5.7
|
D |
| 2591 |
GOLDEN GRAINS
IMO 9777723
|
37,597 | 2018 |
5.7
|
D |
| 2592 |
HATTHAYA NAREE
IMO 9700017
|
39,265 | 2015 |
5.7
|
D |
| 2593 |
FEDERAL CEDAR
IMO 9671101
|
34,564 | 2016 |
5.7
|
D |
| 2594 |
LEGIONY POLSKIE
IMO 9708045
|
39,000 | 2016 |
5.7
|
D |
| 2595 |
ISKENDERUN-M
IMO 9206140
|
31,727 | 1999 |
5.7
|
D |
| 2596 |
RISING LION
IMO 9427031
|
76,596 | 2007 |
5.7
|
D |
| 2597 |
THEMIS
IMO 9452543
|
58,486 | 2007 |
5.7
|
D |
| 2598 |
BAO HE LING
IMO 9604275
|
47,441 | 2015 |
5.7
|
D |
| 2599 |
INTERLINK FORTUITY
IMO 9711755
|
40,083 | 2017 |
5.7
|
D |
| 2600 |
ST PAUL
IMO 9425863
|
57,982 | 2010 |
5.7
|
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.