Most Emission-Efficient General Cargos
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 |
|---|---|---|---|---|---|
| 501 |
AAL KOBE
IMO 9498444
|
32,043 | 2012 |
8.5
|
B |
| 502 |
ERKUL S
IMO 9177789
|
13,347 | 1999 |
8.6
|
B |
| 503 |
AAL DALIAN
IMO 9498470
|
32,190 | 2013 |
8.6
|
B |
| 504 |
HOSEI SAKURA
IMO 9673197
|
16,949 | 2014 |
8.6
|
B |
| 505 |
FORZA ROMA
IMO 9217618
|
32,267 | 2000 |
8.6
|
B |
| 506 |
STELLINA
IMO 9674933
|
26,051 | 2014 |
8.6
|
B |
| 508 |
YAGIZ D
IMO 1051707
|
8,623 | 2024 |
8.6
|
B |
| 507 |
SEREN
IMO 9458391
|
28,085 | 2011 |
8.6
|
B |
| 509 |
WM CRYSTAL
IMO 9660152
|
16,956 | 2013 |
8.6
|
B |
| 511 |
SAPIENZA
IMO 9413066
|
18,917 | 2009 |
8.7
|
B |
| 513 |
MISJE LOTUS
IMO 9967550
|
5,310 | 2024 |
8.7
|
B |
| 512 |
FULDABORG
IMO 9559092
|
14,603 | 2012 |
8.7
|
B |
| 510 |
DANILA BAGROV
IMO 9458420
|
28,309 | 2012 |
8.7
|
B |
| 514 |
SIDER ATLANTIC
IMO 9618795
|
25,469 | 2011 |
8.7
|
B |
| 515 |
SUNNY MARK
IMO 9414955
|
21,639 | 2007 |
8.7
|
B |
| 516 |
FENG HUANG SONG
IMO 9416757
|
27,299 | 2009 |
8.7
|
B |
| 519 |
ADAM ASNYK
IMO 9432115
|
30,346 | 2009 |
8.7
|
B |
| 518 |
LADY DORIS
IMO 9458418
|
28,154 | 2012 |
8.7
|
B |
| 520 |
MISJE VERDE
IMO 9927433
|
5,310 | 2023 |
8.7
|
B |
| 517 |
LILAC ROLLER
IMO 9509712
|
33,200 | 2011 |
8.7
|
B |
| 521 |
SIDER KING
IMO 9615913
|
25,467 | 2011 |
8.8
|
B |
| 522 |
BOCS BREMEN
IMO 9438389
|
34,065 | 2011 |
8.8
|
B |
| 523 |
VERTOM ANNE MARIT
IMO 9938755
|
7,280 | 2024 |
8.8
|
B |
| 524 |
SOLITAIRE I
IMO 9227962
|
24,997 | 2000 |
8.8
|
B |
| 525 |
CHIPOL TAIAN
IMO 9509621
|
33,217 | 2010 |
8.8
|
B |
| 526 |
HOSEI LIBERTY
IMO 9640358
|
14,016 | 2012 |
8.8
|
B |
| 528 |
PERMATA N
IMO 9636137
|
13,428 | 2012 |
8.8
|
B |
| 527 |
CHIPOLBROK ATLANTIC
IMO 9731377
|
31,661 | 2016 |
8.8
|
B |
| 529 |
BAHRI DIRIYAH
IMO 9498482
|
32,241 | 2014 |
8.8
|
B |
| 530 |
VERTOM TULA
IMO 1027706
|
7,308 | 2025 |
8.8
|
B |
| 531 |
ULUSOY-8
IMO 9458250
|
22,303 | 2008 |
8.9
|
B |
| 532 |
VERTOM PATTY
IMO 9938729
|
7,281 | 2022 |
8.9
|
B |
| 533 |
NORD LION
IMO 9673173
|
16,954 | 2014 |
8.9
|
B |
| 534 |
NAVIN KESTREL
IMO 9381811
|
7,949 | 2006 |
8.9
|
B |
| 535 |
MISJE FLORA
IMO 9950698
|
5,310 | 2024 |
8.9
|
B |
| 537 |
GREY FOX
IMO 9594470
|
33,290 | 2011 |
8.9
|
B |
| 536 |
ANNETTA
IMO 9396543
|
11,732 | 2007 |
8.9
|
B |
| 538 |
GOLDEN BIRD
IMO 8517580
|
12,342 | 1986 |
8.9
|
B |
| 539 |
AAL MELBOURNE
IMO 9498456
|
32,128 | 2013 |
8.9
|
B |
| 540 |
KRASZEWSKI
IMO 9432153
|
30,435 | 2011 |
9.0
|
B |
| 541 |
SIDER LIU
IMO 9699725
|
14,632 | 2015 |
9.0
|
B |
| 542 |
XIA MEN ZE AN
IMO 9638628
|
27,263 | 2013 |
9.0
|
B |
| 543 |
AAL GUNSAN
IMO 9393589
|
25,747 | 2010 |
9.0
|
B |
| 545 |
TAAGBORG
IMO 9546461
|
21,338 | 2013 |
9.0
|
B |
| 544 |
GEMINI CAPO
IMO 9662485
|
10,813 | 2012 |
9.0
|
B |
| 546 |
THORCO LIVA
IMO 9643623
|
16,901 | 2012 |
9.0
|
B |
| 547 |
BINNUR C
IMO 9261023
|
31,829 | 2003 |
9.1
|
B |
| 549 |
ARKLOW WAVE
IMO 9818931
|
16,861 | 2018 |
9.1
|
B |
| 548 |
SIDER LION
IMO 9486269
|
25,467 | 2010 |
9.1
|
B |
| 550 |
HALIT BEY
IMO 9511375
|
12,040 | 2008 |
9.1
|
B |
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.