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 |
|---|---|---|---|---|---|
| 3251 |
ALYCIA
IMO 9588366
|
35,058 | 2012 |
7.5
|
E |
| 3252 |
BC LIBERTY
IMO 1021295
|
40,354 | 2025 |
7.5
|
E |
| 3253 |
HOPE
IMO 9545053
|
34,146 | 2011 |
7.5
|
E |
| 3254 |
TAO ACE
IMO 9639696
|
25,037 | 2013 |
7.5
|
E |
| 3255 |
ADELINA
IMO 9595785
|
35,072 | 2012 |
7.5
|
E |
| 3256 |
REK ELITE
IMO 9498626
|
37,369 | 2012 |
7.5
|
E |
| 3257 |
SABEEL STAR
IMO 9257058
|
27,101 | 2003 |
7.5
|
E |
| 3258 |
JAOHAR UK
IMO 9302463
|
27,112 | 2003 |
7.5
|
E |
| 3259 |
MJ MASSA
IMO 9224867
|
29,944 | 2002 |
7.5
|
E |
| 3260 |
CHINA SPIRIT
IMO 9655846
|
35,097 | 2013 |
7.5
|
E |
| 3261 |
AFRICAN HHB
IMO 9666429
|
28,358 | 2015 |
7.5
|
E |
| 3262 |
WL PACIFIC
IMO 9497878
|
33,413 | 2011 |
7.6
|
E |
| 3263 |
PARANA WARRIOR
IMO 9412945
|
28,415 | 2007 |
7.6
|
E |
| 3264 |
DENSA PELICAN
IMO 9603300
|
82,744 | 2012 |
7.6
|
E |
| 3265 |
ANTHEIA
IMO 9473078
|
21,163 | 2010 |
7.6
|
E |
| 3266 |
JOHANNA G
IMO 9285940
|
37,228 | 2004 |
7.6
|
E |
| 3267 |
PHILLIP BAY
IMO 9714757
|
40,030 | 2015 |
7.6
|
E |
| 3268 |
ADVENTURE
IMO 9496329
|
36,895 | 2011 |
7.6
|
E |
| 3269 |
LU YANG SHUN
IMO 9634880
|
29,061 | 2012 |
7.6
|
E |
| 3270 |
MERCURY
IMO 9084231
|
21,955 | 1994 |
7.6
|
E |
| 3271 |
LILLY BOLTEN
IMO 9406063
|
30,765 | 2009 |
7.6
|
E |
| 3272 |
LAGAVULIN
IMO 9396555
|
16,115 | 2007 |
7.6
|
E |
| 3273 |
LADY LAVELA
IMO 9675561
|
28,316 | 2015 |
7.6
|
E |
| 3274 |
TAO BRAVE
IMO 9487586
|
25,065 | 2011 |
7.6
|
E |
| 3275 |
LADY MARGARET
IMO 9499424
|
31,864 | 2013 |
7.6
|
E |
| 3276 |
MAJESTIC VERA
IMO 9474230
|
34,999 | 2011 |
7.6
|
E |
| 3277 |
BOBIK
IMO 9317781
|
31,896 | 2006 |
7.6
|
E |
| 3278 |
RAHMA
IMO 9588380
|
35,829 | 2011 |
7.6
|
E |
| 3279 |
XIN HAI TONG 30
IMO 9611010
|
56,583 | 2013 |
7.6
|
E |
| 3280 |
SC DALLAS
IMO 9587180
|
32,318 | 2011 |
7.6
|
E |
| 3281 |
BULKNES
IMO 9384370
|
33,171 | 2009 |
7.7
|
E |
| 3282 |
QING FENG LING
IMO 9663702
|
34,472 | 2013 |
7.7
|
E |
| 3283 |
BAM DESPINA
IMO 9517549
|
32,411 | 2009 |
7.7
|
E |
| 3284 |
SPLITTNES
IMO 9101730
|
18,886 | 1994 |
7.7
|
E |
| 3285 |
C-INSPIRATION
IMO 9604782
|
28,258 | 2011 |
7.7
|
E |
| 3286 |
YALOUSSA
IMO 9464546
|
28,361 | 2008 |
7.7
|
E |
| 3287 |
LIVADI
IMO 9522946
|
35,058 | 2011 |
7.7
|
E |
| 3288 |
IC PROGRESS
IMO 9611577
|
32,527 | 2011 |
7.7
|
E |
| 3289 |
LADY MARY
IMO 9604744
|
28,238 | 2012 |
7.7
|
E |
| 3290 |
PAIWAN WISDOM
IMO 9427122
|
31,967 | 2010 |
7.7
|
E |
| 3291 |
NJ CALLISTO
IMO 9497452
|
31,796 | 2012 |
7.7
|
E |
| 3292 |
SKIPPER PLANET
IMO 9060730
|
22,176 | 1993 |
7.7
|
E |
| 3293 |
AGIOS NIKOLAOS
IMO 9502776
|
35,217 | 2010 |
7.7
|
E |
| 3294 |
PEBBLE BEACH
IMO 9595979
|
37,003 | 2013 |
7.8
|
E |
| 3295 |
LADY LILLY
IMO 9642021
|
28,397 | 2013 |
7.8
|
E |
| 3296 |
HANNAH
IMO 9464558
|
28,354 | 2008 |
7.8
|
E |
| 3297 |
JULIETTE
IMO 9459113
|
34,398 | 2012 |
7.8
|
E |
| 3298 |
HUA YANG MEI GUI
IMO 9497490
|
30,035 | 2011 |
7.8
|
E |
| 3299 |
LABRADOR
IMO 9415222
|
30,899 | 2010 |
7.8
|
E |
| 3300 |
PEACE M
IMO 9086318
|
26,467 | 1996 |
7.8
|
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.