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 |
|---|---|---|---|---|---|
| 2401 |
XIN HAI TONG 59
IMO 9615315
|
56,642 | 2011 |
5.3
|
D |
| 2402 |
ANARITA
IMO 9636008
|
58,000 | 2012 |
5.3
|
D |
| 2403 |
LADY DIMINE
IMO 9573957
|
28,316 | 2010 |
5.3
|
D |
| 2404 |
QING PING SHAN
IMO 9741504
|
63,474 | 2015 |
5.3
|
D |
| 2405 |
ROMY
IMO 9890862
|
37,897 | 2020 |
5.3
|
D |
| 2406 |
AFRICAN MARGAUX
IMO 9889655
|
38,114 | 2020 |
5.3
|
D |
| 2407 |
FEDERAL BARENTS
IMO 9697820
|
34,564 | 2015 |
5.3
|
D |
| 2408 |
TIANJIN VENTURE
IMO 9457294
|
53,000 | 2009 |
5.3
|
D |
| 2409 |
KIRAN EUROPE
IMO 9491197
|
56,666 | 2010 |
5.3
|
D |
| 2410 |
KOTRAG
IMO 9503287
|
57,000 | 2012 |
5.3
|
D |
| 2411 |
PACIFIC CONSTANT
IMO 9712888
|
61,450 | 2016 |
5.3
|
D |
| 2412 |
TRAMMO INDEPENDENT
IMO 9762895
|
38,800 | 2016 |
5.3
|
D |
| 2413 |
PAN SPIRIT
IMO 9487433
|
56,891 | 2011 |
5.3
|
D |
| 2414 |
CHRYSANTHI S
IMO 9527441
|
80,269 | 2012 |
5.3
|
D |
| 2415 |
MOONRISE
IMO 9438054
|
53,800 | 2009 |
5.3
|
D |
| 2416 |
STAR HELSINKI
IMO 9699270
|
63,605 | 2015 |
5.3
|
D |
| 2417 |
BULKER BEE 30
IMO 9489986
|
34,935 | 2010 |
5.3
|
D |
| 2418 |
SEA BRAVERY
IMO 9386407
|
58,722 | 2008 |
5.3
|
D |
| 2419 |
QING QUAN SHAN
IMO 9741530
|
63,472 | 2016 |
5.3
|
D |
| 2420 |
EBURY TRADER
IMO 9596727
|
56,603 | 2008 |
5.3
|
D |
| 2421 |
PVT PERIDOT
IMO 9601170
|
57,300 | 2013 |
5.3
|
D |
| 2422 |
HU PO HAI
IMO 9738090
|
39,780 | 2015 |
5.3
|
D |
| 2423 |
FUAT BEY
IMO 9663817
|
35,437 | 2014 |
5.3
|
D |
| 2424 |
FEDERAL CLYDE
IMO 9671072
|
34,564 | 2016 |
5.3
|
D |
| 2425 |
SCOTER
IMO 9902299
|
38,270 | 2021 |
5.3
|
D |
| 2426 |
INDIAN BULKER
IMO 9791925
|
37,717 | 2017 |
5.3
|
D |
| 2427 |
XIN AN NING
IMO 9407859
|
55,256 | 2009 |
5.3
|
D |
| 2428 |
NAVIOS CELESTIAL
IMO 9496226
|
58,063 | 2009 |
5.3
|
D |
| 2429 |
ASTERAS
IMO 9610999
|
56,605 | 2013 |
5.3
|
D |
| 2430 |
CHANG SHUN II
IMO 9546071
|
57,000 | 2009 |
5.3
|
D |
| 2431 |
KIRAN AMERICA
IMO 9491264
|
56,569 | 2010 |
5.3
|
D |
| 2432 |
IASOS
IMO 9233882
|
52,817 | 2001 |
5.3
|
D |
| 2433 |
POLES
IMO 9254989
|
50,326 | 2002 |
5.3
|
D |
| 2434 |
FEDERAL COLUMBIA
IMO 9671084
|
34,564 | 2016 |
5.3
|
D |
| 2435 |
AYANA STAR
IMO 9291212
|
28,449 | 2004 |
5.3
|
D |
| 2436 |
CARPE DIEM
IMO 1014967
|
40,455 | 2024 |
5.3
|
D |
| 2437 |
KNOSSOS
IMO 9567544
|
56,762 | 2011 |
5.3
|
D |
| 2438 |
OCEANIC PRAISE
IMO 9687150
|
37,431 | 2015 |
5.3
|
D |
| 2439 |
SEA DHYANA
IMO 9626912
|
56,521 | 2012 |
5.4
|
D |
| 2440 |
QUEEN
IMO 9425928
|
58,096 | 2010 |
5.4
|
D |
| 2441 |
THOR BREEZE
IMO 9474802
|
53,572 | 2013 |
5.4
|
D |
| 2442 |
COLUMBIA RIVER
IMO 9331907
|
55,922 | 2006 |
5.4
|
D |
| 2443 |
CHARISMA
IMO 9409132
|
55,667 | 2010 |
5.4
|
D |
| 2444 |
ECUADOR L
IMO 9426192
|
57,937 | 2011 |
5.4
|
D |
| 2445 |
MARYAM
IMO 9615676
|
56,798 | 2011 |
5.4
|
D |
| 2446 |
SHUN FU XING
IMO 9213363
|
75,172 | 2001 |
5.4
|
D |
| 2447 |
SHEILA
IMO 9730244
|
58,607 | 2016 |
5.4
|
D |
| 2448 |
SIDER MIRAMARE
IMO 9865233
|
39,172 | 2019 |
5.4
|
D |
| 2449 |
CAPTAIN D LEMPESIS
IMO 9364801
|
53,466 | 2005 |
5.4
|
D |
| 2450 |
NEW ISLAND
IMO 9258349
|
47,304 | 2002 |
5.4
|
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.