Most Emission-Efficient Vehicle 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 2024. 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 |
|---|---|---|---|---|---|
| 401 |
SILVER SOUL
IMO 9153783
|
13,695 | 1997 |
22.8
|
E |
| 402 |
GRANDE ITALIA
IMO 9227912
|
12,594 | 2001 |
22.8
|
E |
| 403 |
NEPTUNE ETHOS
IMO 9431862
|
12,250 | 2011 |
22.9
|
E |
| 404 |
SILVER SUN
IMO 8519710
|
9,772 | 1988 |
23.1
|
E |
| 405 |
NEPTUNE KEFALONIA
IMO 9438717
|
11,010 | 2009 |
23.2
|
E |
| 406 |
RCC PASSION
IMO 9453107
|
11,196 | 2011 |
23.2
|
E |
| 407 |
GRANDE NEW JERSEY
IMO 9782704
|
15,853 | 2020 |
23.5
|
E |
| 408 |
PATARA
IMO 9491898
|
12,755 | 2012 |
23.6
|
E |
| 409 |
VIKING EMERALD
IMO 9514987
|
12,459 | 2012 |
23.6
|
E |
| 410 |
VIKING SEA
IMO 9515008
|
12,494 | 2012 |
23.7
|
E |
| 411 |
NEPTUNE THARROS
IMO 9431850
|
12,250 | 2011 |
23.9
|
E |
| 412 |
GOLD XING
IMO 9308807
|
12,315 | 2007 |
23.9
|
E |
| 413 |
CARRERA
IMO 9432880
|
12,296 | 2008 |
24.0
|
E |
| 414 |
VIOLET ACE
IMO 9395630
|
13,370 | 2011 |
24.4
|
E |
| 415 |
NEPTUNE HORIZON
IMO 9451721
|
11,215 | 2010 |
24.6
|
E |
| 416 |
GRANDE DETROIT
IMO 9293272
|
12,420 | 2005 |
24.6
|
E |
| 417 |
GRANDE ANVERSA
IMO 9287417
|
12,378 | 2004 |
24.6
|
E |
| 418 |
TOKYO CAR
IMO 9432907
|
12,280 | 2008 |
25.0
|
E |
| 419 |
PARANA
IMO 9427964
|
12,868 | 2012 |
25.0
|
E |
| 420 |
MALACCA HIGHWAY
IMO 9235414
|
6,864 | 2001 |
25.3
|
E |
| 421 |
NEPTUNE KALLOS
IMO 9442122
|
11,215 | 2010 |
25.3
|
E |
| 422 |
RCC PRESTIGE
IMO 9455715
|
11,196 | 2011 |
25.4
|
E |
| 423 |
GRANDE SPAGNA
IMO 9227924
|
12,590 | 2002 |
25.4
|
E |
| 424 |
SILVER MOON
IMO 9448138
|
12,403 | 2010 |
26.0
|
E |
| 425 |
LAKE KIVU
IMO 9308792
|
12,325 | 2006 |
26.1
|
E |
| 426 |
MORNING MIDAS
IMO 9289910
|
12,249 | 2006 |
26.2
|
E |
| 427 |
THRUXTON
IMO 9782089
|
18,160 | 2018 |
26.4
|
E |
| 428 |
GRANDE COLONIA
IMO 9318527
|
12,292 | 2007 |
26.6
|
E |
| 429 |
NEPTUNE ITHAKI
IMO 9440083
|
11,010 | 2010 |
26.7
|
E |
| 430 |
GRANDE SICILIA
IMO 9312092
|
12,420 | 2006 |
26.8
|
E |
| 431 |
GOLD STAR
IMO 9325178
|
12,322 | 2007 |
27.1
|
E |
| 432 |
CENK CAR
IMO 8611984
|
2,628 | 1986 |
28.4
|
E |
| 433 |
ERK IZMIR
IMO 9179983
|
3,347 | 1998 |
29.9
|
E |
| 434 |
POLARIS PRINCESS
IMO 9136967
|
3,995 | 1996 |
29.9
|
E |
| 435 |
DANUBE HIGHWAY
IMO 9316309
|
7,487 | 2006 |
31.7
|
E |
| 436 |
SEINE HIGHWAY
IMO 9316311
|
7,443 | 2007 |
32.0
|
E |
| 437 |
NORDIC RAY
IMO 9386225
|
7,378 | 2007 |
32.2
|
E |
| 438 |
THAMES HIGHWAY
IMO 9316294
|
7,491 | 2005 |
32.4
|
E |
| 439 |
ELBE HIGHWAY
IMO 9316282
|
7,518 | 2005 |
34.3
|
E |
| 440 |
SCHELDE HIGHWAY
IMO 9065405
|
3,222 | 1993 |
34.4
|
E |
| 441 |
WESER HIGHWAY
IMO 9065417
|
3,222 | 1994 |
34.5
|
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 2024 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.