Most Emission-Efficient Ro-Ro 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.

Segment rank (2025)

#13 of 220 ro-ro cargos

CO₂ intensity

14.8 g CO₂/dwt·nm

vs segment average (30.55)

-51% greener

Bulk Carrier Container Ship Oil Tanker Chemical Tanker Gas Carrier LNG Carrier General Cargo Vehicle Carrier Refrigerated Cargo Ro-Ro Cargo

Sort 🌱 Greenest first 🔧 Least efficient first — retrofit candidates

Size (DWT)

All sizes < 25,000 DWT 25k – 60k DWT 60k – 100k DWT 100k – 200k DWT > 200,000 DWT

Year

2025 2024

225

vessels ranked

7.58

greenest (g CO₂/t·nm)

28.71

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
1	ENDURANCE IMO 9121273	48,988	1996	265 m	Mitsubishi - 7UEC85LSC	7.6	A
2	JASMINE LEADER IMO 9925368	19,359	2023	200 m	WinGD 7X62DF	12.7	A
3	BLUE HERITAGE IMO 9968619	19,025	2024	200 m	UnKnown 6S60ME-C10-GL-coEGR	13.1	A
4	TREASURE IMO 9184859	22,173	1999	200 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 7S60MC	13.5	A
5	SIXTINE IMO 9831165	20,615	2019	216 m	MAN - 7S50ME-C9	14.0	A
6	LAURELINE IMO 9823352	20,615	2019	216 m	MAN - 7S50ME-C9	14.0	A
7	ANJI ANSHENG IMO 1021386	24,663	2025	228 m	MAN-B&W 7S60ME-C10	14.1	A
8	BYD ZHENGZHOU IMO 9999577	19,080	2025	200 m	MAN-B&W 7S60ME-C10-GI	14.2	A
9	DONG-A METIS IMO 9419747	22,582	2010	199 m	MAN - 6S60MC-C	14.3	A
10	HERMINE IMO 9831177	20,615	2019	216 m	Hyundai - 7S50ME-C9	14.3	A
11	FAUSTINE IMO 9889708	20,194	2021	216 m	Hyundai Heavy Industries Co Ltd - South Korea 7S50ME-C-GI	14.6	A
12	YSALINE IMO 9823364	20,615	2019	216 m	MAN - 7S50ME-C9	14.8	A
13	DONG-A GLAUCOS IMO 9441867	26,985	2011	232 m	Hyundai - 8S60ME-C8	15.4	A
14	SERAPHINE IMO 9889710	20,092	2022	216 m	Hyundai Heavy Industries Co Ltd - South Korea 7S50ME-C9-GI	15.4	A
15	SAFFET BEY IMO 8417118	14,107	1987	164 m	MAK/Caterpillar - 6M601AK	15.4	A
16	CHAUMINE IMO 9963566	25,595	2025	234 m	MAN-B&W 6S60ME-C10-GI	15.7	A
17	JISU FORTUNE IMO 9981570	19,160	2025	200 m	MAN - 6S60ME-C10	15.8	A
18	ULUSOY-5 IMO 8501464	14,103	1987	164 m	MAK/Caterpillar - 6M601AK	15.8	A
19	YOUNG SHIN IMO 9021332	14,274	1992	180 m	Mitsubishi - 7UEC60LA	15.9	A
20	BYD HEFEI IMO 9999565	19,119	2025	200 m	MAN-B&W 7S60ME-C10-GI	16.3	A
21	BOTNIA ENABLER IMO 9884679	24,600	2022	242 m	Wärtsilä - 7RT-flex50DF	16.7	A
22	LEONINE IMO 9963578	25,460	2025	234 m	MAN-B&W 6S60ME-C10-GI	16.8	A
23	BALTIC ENABLER IMO 9884681	24,600	2022	242 m	Wärtsilä - 7RT-flex50DF	17.1	A
24	CELINE IMO 9789233	27,687	2017	234 m	Hyundai - 9S60ME-C	17.7	A
25	DELPHINE IMO 9789245	27,687	2018	234 m	Hyundai - 9S60ME-C	17.8	A
26	ORANJEBORG IMO 9232797	15,126	2004	159 m	Wärtsilä - 6 L 46 C	18.0	A
27	LYKTOS IMO 8401145	9,200	1986	161 m	MAK/Caterpillar - 8M552AK	18.1	A
28	ARK FUTURA IMO 9129598	13,500	1996	183 m	MAN - 8 L 58/64	18.2	A
29	SOMERSET IMO 9188221	12,500	1999	183 m	Sulzer - 7RTA52U	19.7	A
30	SCA ORTVIKEN IMO 9087374	11,521	1996	170 m	MAK/Caterpillar - 6M552C	20.2	A
31	BELGIA SEAWAYS IMO 9188233	12,082	2000	183 m	Sulzer - 7RTA52U	20.4	A
32	TRANS CARRIER IMO 9007879	7,193	1992	144 m	Wärtsilä - 16V32D	20.4	A
33	NEOLINER ORIGIN IMO 1021829	6,598	2025	136 m	A.B.C. 16DZC	20.6	A
34	SC CONNECTOR IMO 9131993	8,843	1997	154 m	Wärtsilä - 16 V 46 B	20.9	A
35	PALATINE IMO 9376701	14,565	2009	195 m	MAK/Caterpillar - 12M43C	21.0	A
36	SCA OSTRAND IMO 9087362	11,561	1996	170 m	MAK/Caterpillar - 6M552C	21.0	A
37	VASSILIOS IMO 8813154	13,772	1990	158 m	Wärtsilä - 9R46	21.2	A
38	PEREGRINE IMO 9376725	14,538	2010	195 m	MAK/Caterpillar - 12M43C	21.3	A
39	SCA OBBOLA IMO 9087350	11,446	1996	170 m	MAK/Caterpillar - 6M552C	21.3	A
40	VESPERTINE IMO 9376713	14,483	2010	195 m	MAK/Caterpillar - 12M43C	21.6	A
41	MERNA 2 IMO 9165310	13,179	1998	195 m	MAN - 9L58/64	21.8	A
42	SOUTH ENABLER IMO 1022641	13,726	2025	203 m	—	22.0	A
43	MOSEL ACE IMO 9177052	12,761	2000	176 m	'Uljanik' Strojogradnja dd - Croatia 7S50MC	22.1	A
44	ULUSOY-15 IMO 9506265	13,231	2013	208 m	MAN - 7L48/60CR	22.5	A
45	EPHESUS SEAWAYS IMO 9816830	17,011	2019	237 m	MAN - 8S50ME-C9	22.8	B
46	BALTIC BRIGHT IMO 9129263	6,302	1995	134 m	MAK/Caterpillar - MAK 6 M 32	22.8	B
47	MAZARINE IMO 9376696	14,552	2009	195 m	MAK/Caterpillar - 12M43C	22.9	B
48	CATHERINE IMO 9209453	13,320	2002	182 m	Wärtsilä - 12V46C	23.0	B
49	ECO SALERNO IMO 9985538	18,098	2025	238 m	MAN-B&W 9S50ME-C9	23.1	B
50	SAMSKIP KVITBJØRN IMO 9642564	4,900	2015	120 m	Bergen - B35:40L9P	23.1	B

Page 1 of 5 — 220 vessels

Engine intelligence

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.

Emission-friendly engine ranking

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.