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 2024. Lower is greener. Pick a segment and size class to see the greenest vessels first.

Segment rank (2024)

#78 of 214 ro-ro cargos

CO₂ intensity

25.6 g CO₂/dwt·nm

vs segment average (31.83)

-20% 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

219

vessels ranked

7.13

greenest (g CO₂/t·nm)

30.41

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
51	SAMSKIP KVITNOS IMO 9642576	4,900	2015	120 m	Bergen - B35:40L9P	24.1	B
52	AYA M IMO 9007867	6,294	1995	125 m	Wärtsilä - 16V32D	24.1	B
53	BORE SONG IMO 9443566	13,375	2011	195 m	MAK/Caterpillar - 12M43C	24.1	B
54	SAMSKIP KVITBJØRN IMO 9642564	4,900	2015	120 m	Bergen - B35:40L9P	24.1	B
55	ML FREYJA IMO 9799977	12,784	2017	191 m	MAK/Caterpillar - 6 M 43 C	24.2	B
56	ZEUGMA SEAWAYS IMO 9356737	14,915	2008	223 m	MAK/Caterpillar - 9M43	24.2	B
57	SCANDIA SEAWAYS IMO 9864681	18,790	2021	237 m	MAN - 8S50ME-C9	24.3	B
58	OPALINE IMO 9424869	13,439	2010	195 m	MAK/Caterpillar - 12M43C	24.4	B
59	ULUSOY-14 IMO 9506253	13,231	2012	208 m	MAN - 7L48/60CR	24.4	B
60	ECO CATANIA IMO 9859571	18,086	2021	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	24.6	B
61	BOTHNIABORG IMO 9267728	9,995	2004	153 m	Wärtsilä - 9M43	24.6	B
62	YASMINE IMO 9337353	17,023	2007	203 m	MAK/Caterpillar - 12M43	24.6	B
63	ASTURIAS IMO 9481049	12,470	2010	167 m	Hyundai - 7S50ME-C	24.8	B
64	AMANDINE IMO 9424871	13,428	2011	195 m	MAK/Caterpillar - 12M43C	25.0	B
65	MAXINE IMO 9188245	10,601	2000	183 m	Sulzer - 7RTA52U	25.0	B
66	FLANDRIA SEAWAYS IMO 9860142	17,183	2020	237 m	MAN - 8S50ME-C9	25.1	B
67	ECO ADRIATICA IMO 9859600	18,121	2022	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	25.1	B
68	BALTICBORG IMO 9267716	9,903	2004	153 m	Wärtsilä - 9M43	25.1	B
69	ECO MALTA IMO 9859583	18,096	2022	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	25.2	B
70	ELYSSA IMO 9208007	14,200	2000	193 m	MAK/Caterpillar - 9M43	25.2	B
71	FICARIA SEAWAYS IMO 9320568	15,990	2006	230 m	MAN - 9L60MC-C	25.3	B
72	AKRITAS IMO 8020599	13,030	1982	155 m	Oy Wartsila Ab - Finland 12PC2-6V400	25.3	B
73	MARFRET NIOLON IMO 8912388	5,282	1991	123 m	Wärtsilä - 16V32D	25.3	B
74	STENA FORECASTER IMO 9214678	12,300	2003	195 m	Sulzer - ZA40S	25.4	B
75	BELGIA SEAWAYS IMO 9188233	12,082	2000	183 m	Sulzer - 7RTA52U	25.4	B
76	ECO SAVONA IMO 9859569	18,097	2021	238 m	Hyundai Heavy Industries Co. Ltd. 9S50ME-C9	25.6	B
77	EUROCARGO SALERNO IMO 9175494	13,242	1998	195 m	Wärtsilä - 8R46B	25.6	B
78	ECO BARCELONA IMO 9859545	18,079	2021	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	25.7	B
79	THULELAND IMO 9343261	13,800	2006	191 m	MAN - 9L48/60B	25.7	B
80	GRENDI FUTURA IMO 9687306	11,585	2014	179 m	MAN - 9L32/44CR	25.9	B
81	LINK STAR IMO 8805602	4,453	1989	107 m	Wärtsilä - 8 R 32 D	25.9	B
82	ECO LIVORNO IMO 9859557	18,139	2021	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	26.0	B
83	HOLLANDIA SEAWAYS IMO 9832585	17,048	2019	237 m	MAN - 8S50ME-C	26.0	B
84	MIMER IMO 9002647	4,489	1990	108 m	Wärtsilä - 9 R 32 D	26.0	B
85	LINK NOVA IMO 8911748	5,387	1992	122 m	Wärtsilä - 16V32D	26.3	B
86	BORE SEA IMO 9443554	13,375	2011	195 m	MAK/Caterpillar - 12M43C	26.3	B
87	ECO VALENCIA IMO 9859533	18,128	2020	238 m	MAN-B&W 9S50ME-C9	26.3	C
88	HUMBRIA SEAWAYS IMO 9832597	17,183	2020	235 m	MAN - 8S50ME-C	26.4	C
89	PAULINE IMO 9324473	17,023	2006	203 m	MAK/Caterpillar - 12M43	27.1	C
90	LINK GALAXY IMO 8820860	5,409	1991	122 m	Wärtsilä - 16V32D	27.3	C
91	CARIBBEAN FORCE IMO 9335161	7,342	2007	145 m	MAK/Caterpillar - 12M32C	27.8	C
92	EUROCARGO BARI IMO 9471082	10,780	2012	200 m	MAN - 9L60MC-C	27.8	C
93	LAKEWAY EXPRESS IMO 9183790	7,440	1999	153 m	Wärtsilä - 12V46C	28.2	C
94	MELUSINE IMO 9166637	9,729	1999	162 m	MAN - 7L40/54	28.3	C
95	BEGONIA SEAWAYS IMO 9262089	14,424	2004	230 m	MAN - 9L60MC-C	28.5	C
96	FINNECO II IMO 9856842	17,389	2022	238 m	UnKnown 9S50ME-C9	28.8	C
97	ULUSOY-16 IMO 9809095	10,310	2017	210 m	MAN - 8L48/60CR	28.8	C
98	BOTNIA SEAWAYS IMO 9192129	8,702	2000	163 m	MAN - 12V48/60	28.9	C
99	JOLLY BLUE IMO 9180205	11,203	1999	184 m	Wärtsilä - R32	29.0	C
100	BLUE CARRIER 2 IMO 9125384	9,655	1997	162 m	MAN - 7L40/54	29.2	C

Page 2 of 5 — 214 vessels

← Prev Next →

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 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.

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.