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 |
|---|---|---|---|---|---|
| 2301 |
WILSON MONSOON
IMO 9163582
|
2,780 | 1997 |
24.5
|
E |
| 2302 |
COE GISELA
IMO 8513314
|
1,815 | 1985 |
24.5
|
E |
| 2303 |
HJORDIS
IMO 9126235
|
6,904 | 1996 |
24.5
|
E |
| 2304 |
SKOG
IMO 8912039
|
3,728 | 1991 |
24.6
|
E |
| 2305 |
FIONA B
IMO 9574303
|
3,500 | 2012 |
24.8
|
E |
| 2306 |
WHARFE RIVER
IMO 8903052
|
3,212 | 1991 |
24.8
|
E |
| 2307 |
GULF ANGEL
IMO 9125059
|
4,454 | 1996 |
24.9
|
E |
| 2308 |
BBC FUJI
IMO 9508419
|
9,266 | 2011 |
24.9
|
E |
| 2309 |
BBC VESUVIUS
IMO 9508471
|
9,310 | 2012 |
24.9
|
E |
| 2310 |
GOTLAND
IMO 9361366
|
4,329 | 2008 |
24.9
|
E |
| 2311 |
INDUSTRIAL DOLPHIN
IMO 9360192
|
7,996 | 2007 |
24.9
|
E |
| 2312 |
EMS CALYPSO
IMO 9557393
|
2,600 | 2012 |
25.0
|
E |
| 2313 |
MALIK ARCTICA
IMO 9618135
|
8,438 | 2017 |
25.0
|
E |
| 2314 |
SCHILLPLATE
IMO 9505285
|
3,176 | 2009 |
25.1
|
E |
| 2315 |
WILSON BERGEN
IMO 9557408
|
2,595 | 2016 |
25.1
|
E |
| 2316 |
BORKUM
IMO 9457153
|
5,490 | 2012 |
25.1
|
E |
| 2317 |
ANA-N
IMO 9416850
|
3,301 | 2008 |
25.3
|
E |
| 2318 |
NINA B
IMO 9213703
|
1,802 | 2000 |
25.3
|
E |
| 2319 |
RIKKE B
IMO 9574315
|
3,500 | 2012 |
25.4
|
E |
| 2320 |
BBC SCANDINAVIA
IMO 9362633
|
7,534 | 2007 |
25.4
|
E |
| 2321 |
CARTEN ELINA
IMO 8713653
|
3,727 | 1989 |
25.6
|
E |
| 2322 |
RIX MUNTE
IMO 9191254
|
4,433 | 1998 |
25.6
|
E |
| 2323 |
FRIENDLAND
IMO 9246906
|
4,684 | 2002 |
25.6
|
E |
| 2324 |
GANDA
IMO 9298129
|
2,637 | 2003 |
25.6
|
E |
| 2325 |
YUSUF BEY
IMO 9139127
|
4,766 | 1997 |
25.7
|
E |
| 2326 |
HOHE BANK
IMO 9505302
|
3,177 | 2010 |
25.8
|
E |
| 2327 |
LANGEOOG
IMO 9506136
|
5,463 | 2013 |
25.9
|
E |
| 2328 |
NORRBOTTEN
IMO 9191931
|
5,527 | 2001 |
25.9
|
E |
| 2329 |
HILDA B
IMO 9466233
|
3,500 | 2011 |
25.9
|
E |
| 2330 |
BBC EVEREST
IMO 9508407
|
9,310 | 2011 |
26.0
|
E |
| 2331 |
SPIEKEROOG
IMO 9506148
|
5,489 | 2013 |
26.0
|
E |
| 2332 |
MAY B
IMO 9138757
|
2,398 | 1996 |
26.1
|
E |
| 2333 |
ARINA
IMO 9173446
|
5,001 | 1998 |
26.1
|
E |
| 2334 |
WILSON ROTTERDAM
IMO 9557381
|
2,600 | 2017 |
26.1
|
E |
| 2335 |
WILSON SAAR
IMO 9125841
|
1,687 | 1996 |
26.2
|
E |
| 2336 |
TALINA B
IMO 9466221
|
3,500 | 2010 |
26.2
|
E |
| 2337 |
SCOT BAY
IMO 9243930
|
3,154 | 2001 |
26.3
|
E |
| 2338 |
SCOT MARINER
IMO 9243916
|
3,313 | 2001 |
26.4
|
E |
| 2339 |
CONSTANCE
IMO 9505338
|
3,196 | 2011 |
26.4
|
E |
| 2340 |
SCAN FJELL
IMO 8405878
|
3,040 | 1985 |
26.5
|
E |
| 2341 |
BBC NAPLES
IMO 9484223
|
9,775 | 2010 |
26.6
|
E |
| 2342 |
MARIANNE DANICA
IMO 9006241
|
2,200 | 1993 |
26.6
|
E |
| 2343 |
ATLANTIS
IMO 8721533
|
3,337 | 1988 |
26.7
|
E |
| 2344 |
LAURA
IMO 9126223
|
6,940 | 1996 |
26.9
|
E |
| 2345 |
SONORO
IMO 9199397
|
4,077 | 2000 |
26.9
|
E |
| 2346 |
TITUS
IMO 9195470
|
4,299 | 2006 |
26.9
|
E |
| 2347 |
NORDERNEY
IMO 9506124
|
5,476 | 2012 |
27.0
|
E |
| 2348 |
EEMSLIFT NADINE
IMO 9671436
|
4,428 | 2014 |
27.1
|
E |
| 2349 |
AMBER LIGHT
IMO 9158109
|
4,433 | 2005 |
27.1
|
E |
| 2350 |
MOHSEN
IMO 8703270
|
7,443 | 1987 |
27.1
|
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.