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 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 |
|---|---|---|---|---|---|
| 451 |
GRANDE FLORIDA
IMO 9782716
|
15,853 | 2020 |
23.5
|
E |
| 452 |
GRANDE NEW JERSEY
IMO 9782704
|
15,853 | 2020 |
23.6
|
E |
| 453 |
GRAND BENELUX
IMO 9227900
|
12,594 | 2001 |
23.8
|
E |
| 454 |
GRANDE DETROIT
IMO 9293272
|
12,420 | 2005 |
23.8
|
E |
| 455 |
GRANDE PORTOGALLO
IMO 9245598
|
12,609 | 2002 |
23.9
|
E |
| 456 |
LAKE WANAKA
IMO 9432892
|
12,300 | 2008 |
24.0
|
E |
| 457 |
PATARA
IMO 9491898
|
12,755 | 2012 |
24.2
|
E |
| 458 |
MALACCA HIGHWAY
IMO 9235414
|
6,864 | 2001 |
24.3
|
E |
| 459 |
TING JIANG KOU
IMO 9991783
|
19,043 | 2022 |
24.3
|
E |
| 460 |
TOKYO CAR
IMO 9432907
|
12,280 | 2008 |
24.3
|
E |
| 461 |
CORAL LEADER
IMO 9318486
|
10,859 | 2006 |
24.6
|
E |
| 462 |
RCC PRESTIGE
IMO 9455715
|
11,196 | 2011 |
24.7
|
E |
| 463 |
GRANDE ANVERSA
IMO 9287417
|
12,378 | 2004 |
24.8
|
E |
| 464 |
LAKE TAUPO
IMO 9289908
|
12,665 | 2003 |
24.9
|
E |
| 465 |
GRANDE COLONIA
IMO 9318527
|
12,292 | 2007 |
24.9
|
E |
| 466 |
GOLD XING
IMO 9308807
|
12,315 | 2007 |
24.9
|
E |
| 467 |
LAKE KIVU
IMO 9308792
|
12,325 | 2006 |
25.2
|
E |
| 468 |
EMERALD LEADER
IMO 9361811
|
10,821 | 2008 |
25.9
|
E |
| 469 |
LAKE COMO
IMO 9432919
|
12,321 | 2009 |
26.1
|
E |
| 470 |
RCC PASSION
IMO 9453107
|
11,196 | 2011 |
27.0
|
E |
| 471 |
GOLD STAR
IMO 9325178
|
12,322 | 2007 |
28.4
|
E |
| 472 |
NORDIC RAY
IMO 9386225
|
7,378 | 2007 |
30.8
|
E |
| 473 |
THAMES HIGHWAY
IMO 9316294
|
7,491 | 2005 |
31.2
|
E |
| 474 |
POLARIS PRINCESS
IMO 9136967
|
3,995 | 1996 |
32.6
|
E |
| 475 |
SEINE HIGHWAY
IMO 9316311
|
7,443 | 2007 |
32.7
|
E |
| 476 |
DANUBE HIGHWAY
IMO 9316309
|
7,487 | 2006 |
32.7
|
E |
| 477 |
ELBE HIGHWAY
IMO 9316282
|
7,518 | 2005 |
33.0
|
E |
| 478 |
WESER HIGHWAY
IMO 9065417
|
3,222 | 1994 |
33.3
|
E |
| 479 |
CITY OF ST. PETERSBURG
IMO 9473456
|
5,000 | 2010 |
34.6
|
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.