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 |
|---|---|---|---|---|---|
| 3351 |
MIRO G
IMO 9589712
|
28,207 | 2011 |
8.2
|
E |
| 3352 |
NESREENA EMPRESS
IMO 9475727
|
33,078 | 2010 |
8.2
|
E |
| 3353 |
RESKO
IMO 9393462
|
30,372 | 2010 |
8.2
|
E |
| 3354 |
COMMANDER K
IMO 9650494
|
35,207 | 2012 |
8.3
|
E |
| 3355 |
ALKADI BEY
IMO 9085675
|
21,964 | 1995 |
8.3
|
E |
| 3356 |
TAO STAR
IMO 9487562
|
25,064 | 2010 |
8.3
|
E |
| 3357 |
BELTNES
IMO 9432206
|
33,173 | 2009 |
8.3
|
E |
| 3358 |
AMAPOLA
IMO 9588342
|
35,037 | 2011 |
8.3
|
E |
| 3359 |
ATLANTIC OCEAN
IMO 9467598
|
36,009 | 2010 |
8.3
|
E |
| 3360 |
JUNO
IMO 9422378
|
30,185 | 2011 |
8.3
|
E |
| 3361 |
GOLDEN STAR
IMO 9257981
|
29,837 | 2002 |
8.3
|
E |
| 3362 |
SUNDA
IMO 9498236
|
30,691 | 2010 |
8.3
|
E |
| 3363 |
NOELLE G
IMO 9459967
|
30,877 | 2011 |
8.4
|
E |
| 3364 |
LILA INCHEON
IMO 9571272
|
32,401 | 2010 |
8.4
|
E |
| 3365 |
SAINT VASSILIOS
IMO 9486403
|
33,889 | 2007 |
8.4
|
E |
| 3366 |
ADNAN TORLAK
IMO 9243253
|
18,712 | 2001 |
8.4
|
E |
| 3367 |
CELINA
IMO 9119074
|
24,325 | 1995 |
8.5
|
E |
| 3368 |
AP KUPARI
IMO 9489168
|
34,373 | 2010 |
8.5
|
E |
| 3369 |
AVELLANEDA
IMO 9571636
|
34,938 | 2013 |
8.5
|
E |
| 3370 |
ATALANTE
IMO 9363168
|
23,641 | 2008 |
8.5
|
E |
| 3371 |
HAROUN BEY
IMO 9082609
|
26,300 | 1995 |
8.5
|
E |
| 3372 |
RUBATO
IMO 9487550
|
25,159 | 2010 |
8.5
|
E |
| 3373 |
CECELA S
IMO 9227857
|
19,225 | 2000 |
8.5
|
E |
| 3374 |
AGIOI THEODOROI
IMO 9515527
|
28,338 | 2009 |
8.5
|
E |
| 3375 |
SANTAMARIA
IMO 9571612
|
34,938 | 2013 |
8.5
|
E |
| 3376 |
FN OCEAN
IMO 9567441
|
56,556 | 2011 |
8.6
|
E |
| 3377 |
HADEEL
IMO 9406087
|
30,420 | 2010 |
8.6
|
E |
| 3378 |
CSL THAMES
IMO 9440447
|
29,827 | 2006 |
8.6
|
E |
| 3379 |
SIGMA PIONEER
IMO 9543249
|
31,800 | 2011 |
8.6
|
E |
| 3380 |
EIRINI S
IMO 9595369
|
34,039 | 2012 |
8.6
|
E |
| 3381 |
S NEPTUNE
IMO 9634892
|
29,037 | 2012 |
8.6
|
E |
| 3382 |
STAMFORD PIONEER
IMO 9636943
|
32,211 | 2012 |
8.7
|
E |
| 3383 |
CHESTNUT
IMO 9477866
|
30,810 | 2010 |
8.7
|
E |
| 3384 |
WHITE IVY
IMO 9370393
|
16,383 | 2008 |
8.7
|
E |
| 3385 |
SUPRA
IMO 9397200
|
16,648 | 2006 |
8.7
|
E |
| 3386 |
PRIDE
IMO 9480277
|
16,987 | 2008 |
8.7
|
E |
| 3387 |
CAPTAIN RABIE
IMO 9172387
|
35,366 | 1999 |
8.7
|
E |
| 3388 |
A LINE
IMO 9246920
|
12,259 | 2001 |
8.7
|
E |
| 3389 |
PETREL S
IMO 9363883
|
19,100 | 2006 |
8.7
|
E |
| 3390 |
LUBIE
IMO 9441984
|
30,210 | 2011 |
8.7
|
E |
| 3391 |
VITOSHA
IMO 9564138
|
30,693 | 2010 |
8.8
|
E |
| 3392 |
NEW COMMANDER
IMO 9610652
|
37,187 | 2012 |
8.8
|
E |
| 3393 |
KALLIOPI S
IMO 9450844
|
34,402 | 2012 |
8.8
|
E |
| 3394 |
SANDNES
IMO 9306029
|
27,711 | 2005 |
8.8
|
E |
| 3395 |
GREENTEC
IMO 9493509
|
33,035 | 2008 |
8.8
|
E |
| 3396 |
YU LONG LING
IMO 9505431
|
32,005 | 2011 |
8.8
|
E |
| 3397 |
ANGELS SPIRIT
IMO 9502740
|
35,239 | 2009 |
8.8
|
E |
| 3398 |
MOHAC
IMO 9251042
|
15,503 | 2001 |
8.8
|
E |
| 3399 |
MUZAFFER ESENER
IMO 9381861
|
21,211 | 2007 |
8.8
|
E |
| 3400 |
ZULFIKAR
IMO 9211547
|
28,373 | 2000 |
8.8
|
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.