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)

#59 of 220 ro-ro cargos

CO₂ intensity

23.7 g CO₂/dwt·nm

vs segment average (30.55)

-22% 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
51	ECO NAPOLI IMO 9985540	18,083	2025	238 m	MAN-B&W 9S50ME-C9	23.1	B
52	LINK STAR IMO 8805602	4,453	1989	107 m	Wärtsilä - 8 R 32 D	23.3	B
53	MIDAS IMO 9002659	4,491	1990	109 m	Wärtsilä - 9 R 32 D	23.4	B
54	ECO ITALIA IMO 9859612	18,080	2022	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	23.4	B
55	SCANDIA SEAWAYS IMO 9864681	18,790	2021	237 m	MAN - 8S50ME-C9	23.5	B
56	SAMSKIP KVITNOS IMO 9642576	4,900	2015	120 m	Bergen - B35:40L9P	23.6	B
57	SUMELA SEAWAYS IMO 9356749	14,915	2008	223 m	MAK/Caterpillar - 9M43	23.6	B
58	GRENDI STAR IMO 9799977	12,784	2017	191 m	MAK/Caterpillar - 6 M 43 C	23.6	B
59	TROY SEAWAYS IMO 9816842	17,183	2019	237 m	MAN - 8S50ME-C	23.7	B
60	ECO MEDITERRANEA IMO 9859595	18,102	2022	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	23.7	B
61	ECO CATANIA IMO 9859571	18,086	2021	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	23.8	B
62	MYRA SEAWAYS IMO 9422122	15,391	2009	223 m	MAK/Caterpillar - 9M43	23.9	B
63	AMILCAR IMO 9207998	14,268	2000	193 m	MAK/Caterpillar - 9M43	24.1	B
64	GALATA SEAWAYS IMO 9422134	15,121	2010	223 m	MAK/Caterpillar - 9M43	24.1	B
65	BORE SONG IMO 9443566	13,375	2011	195 m	MAK/Caterpillar - 12M43C	24.1	B
66	OPALINE IMO 9424869	13,439	2010	195 m	MAK/Caterpillar - 12M43C	24.1	B
67	ULUSOY-14 IMO 9506253	13,231	2012	208 m	MAN - 7L48/60CR	24.1	B
68	ZEUGMA SEAWAYS IMO 9356737	14,915	2008	223 m	MAK/Caterpillar - 9M43	24.2	B
69	MIMER IMO 9002647	4,489	1990	108 m	Wärtsilä - 9 R 32 D	24.4	B
70	FICARIA SEAWAYS IMO 9320568	15,990	2006	230 m	MAN - 9L60MC-C	24.4	B
71	AYA M IMO 9007867	6,294	1995	125 m	Wärtsilä - 16V32D	24.6	B
72	BALTICBORG IMO 9267716	9,903	2004	153 m	Wärtsilä - 9M43	24.6	B
73	TRANS SOL IMO 9348936	11,407	2007	166 m	Wärtsilä - 6L46F	24.6	B
74	HOLLANDIA SEAWAYS IMO 9832585	17,048	2019	237 m	MAN - 8S50ME-C	24.6	B
75	AMANDINE IMO 9424871	13,428	2011	195 m	MAK/Caterpillar - 12M43C	24.7	B
76	BOTHNIABORG IMO 9267728	9,995	2004	153 m	Wärtsilä - 9M43	24.9	B
77	ECO SAVONA IMO 9859569	18,097	2021	238 m	Hyundai Heavy Industries Co. Ltd. 9S50ME-C9	25.0	B
78	STENA FORECASTER IMO 9214678	12,300	2003	195 m	Sulzer - ZA40S	25.1	B
79	YASMINE IMO 9337353	17,023	2007	203 m	MAK/Caterpillar - 12M43	25.1	B
80	LINK NOVA IMO 8911748	5,387	1992	122 m	Wärtsilä - 16V32D	25.1	B
81	LINK GALAXY IMO 8820860	5,409	1991	122 m	Wärtsilä - 16V32D	25.1	B
82	LINK SUN IMO 8805597	4,452	1989	107 m	Wärtsilä - 8 R 32 D	25.2	B
83	MARFRET NIOLON IMO 8912388	5,282	1991	123 m	Wärtsilä - 16V32D	25.3	B
84	TRANS HAV IMO 9348948	11,405	2007	166 m	Wärtsilä - 6L46F	25.3	B
85	ECO ADRIATICA IMO 9859600	18,121	2022	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	25.3	B
86	FLANDRIA SEAWAYS IMO 9860142	17,183	2020	237 m	MAN - 8S50ME-C9	25.5	B
87	TAVASTLAND IMO 9334959	13,800	2006	191 m	MAN - 9L48/60B	25.6	B
88	ECO VALENCIA IMO 9859533	18,128	2020	238 m	MAN-B&W 9S50ME-C9	25.6	B
89	ECO MALTA IMO 9859583	18,096	2022	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	25.7	C
90	TUNDRALAND IMO 9343273	13,800	2007	191 m	MAN - 9L48/60B	25.9	C
91	MAXINE IMO 9188245	10,601	2000	183 m	Sulzer - 7RTA52U	26.0	C
92	AKRITAS IMO 8020599	13,030	1982	155 m	Oy Wartsila Ab - Finland 12PC2-6V400	26.3	C
93	ASTURIAS IMO 9481049	12,470	2010	167 m	Hyundai - 7S50ME-C	26.3	C
94	HUMBRIA SEAWAYS IMO 9832597	17,183	2020	235 m	MAN - 8S50ME-C	26.4	C
95	JOLLY BLUE IMO 9180205	11,203	1999	184 m	Wärtsilä - R32	26.4	C
96	ELYSSA IMO 9208007	14,200	2000	193 m	MAK/Caterpillar - 9M43	26.5	C
97	ECO LIVORNO IMO 9859557	18,139	2021	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	26.6	C
99	MERNA 1 IMO 8716954	3,966	1989	125 m	Wärtsilä - 12V32	26.7	C
98	FINNECO I IMO 9856830	17,359	2022	238 m	UnKnown 9S50ME-C9	26.7	C
100	BORE SEA IMO 9443554	13,375	2011	195 m	MAK/Caterpillar - 12M43C	26.7	C

Page 2 of 5 — 220 vessels

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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.