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)

#126 of 214 ro-ro cargos

CO₂ intensity

31.8 g CO₂/dwt·nm

vs segment average (31.83)

+0% higher

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
101	TRANSPORTER IMO 8820858	5,387	1991	122 m	Wärtsilä - 16V32D	29.3	C
102	CANOPEE IMO 9924120	5,491	2022	121 m	Wärtsilä - 6L32DF	29.4	C
103	FINNECO I IMO 9856830	17,359	2022	238 m	UnKnown 9S50ME-C9	29.4	C
104	FRIEDRICH RUSS IMO 9186417	7,296	1999	153 m	Wärtsilä - 12V46C	29.5	C
105	FREESIA SEAWAYS IMO 9274848	14,330	2005	230 m	MAN - 9L60MC-C	29.6	C
106	STENA FORERUNNER IMO 9227259	12,300	2003	195 m	Sulzer - ZA40S	29.8	C
107	POL STELLA IMO 9457165	11,555	2009	193 m	MAK/Caterpillar - 9M43	30.0	C
108	MSC BRIDGE IMO 9138783	13,018	1998	183 m	Sulzer - 8ZA40S	30.1	C
109	ESTRADEN IMO 9181077	9,741	1999	163 m	Wärtsilä - 8R46A	30.2	C
110	FRANCESCO NULLO IMO 9457189	11,555	2010	193 m	MAK/Caterpillar - 9M43	30.4	C
111	VICTORINE IMO 9184029	9,755	2000	162 m	MAN - 7L40/54	30.4	C
112	ARTEMIS SEAWAYS IMO 9293428	11,636	2005	193 m	MAK/Caterpillar - 9M43	30.5	C
113	CELANDINE IMO 9183984	9,415	2000	162 m	MAN - 7L40/54	30.5	C
114	SEA CARYATIS IMO 9166625	9,729	1999	162 m	MAN - 7L40/54	30.5	C
115	JOLLY EXPRESS IMO 9180190	11,203	1999	184 m	Wärtsilä - R32	30.5	C
116	FINNECO III IMO 9856854	17,309	2022	238 m	UnKnown 9S50ME-C9	30.7	C
117	PRIMULA SEAWAYS IMO 9259513	14,012	2004	230 m	MAN - 9L60MC-C	30.7	C
118	ASPENDOS SEAWAYS IMO 9322425	11,636	2005	193 m	MAK/Caterpillar - 9M43	30.8	C
119	NORSTREAM IMO 9186194	11,585	1999	180 m	Wärtsilä - 9 L 46 C	30.8	C
120	NORSKY IMO 9186182	11,564	1999	180 m	Wärtsilä - 9 L 46 C	30.9	C
121	DARDANELLES SEAWAYS IMO 9322437	11,636	2006	193 m	MAK/Caterpillar - 9M43	31.1	C
122	ASSOS SEAWAYS IMO 9293416	11,636	2005	193 m	MAK/Caterpillar - 9M43	31.3	C
123	PERGAMON SEAWAYS IMO 9506277	13,230	2013	208 m	MAN - 7L48/60CR	31.3	C
124	FADIQ IMO 9809590	11,978	2017	210 m	MAN - 8L48/60CR	31.5	C
125	FINNBREEZE IMO 9468889	14,467	2011	188 m	Wärtsilä - 8L46F	31.6	C
126	SLAVYANIN IMO 8300169	6,258	1984	120 m	Oy Wartsila Ab - Finland 10PC2-6V-400	31.8	C
127	TULIPA SEAWAYS IMO 9809100	11,917	2017	210 m	Wärtsilä - 8L48/60CR	31.8	C
128	SEA-CARGO EXPRESS IMO 9358060	4,894	2012	117 m	Wärtsilä - 9L32	31.8	C
129	FINNSEA IMO 9468891	14,467	2011	188 m	Wärtsilä - 8L46F	31.8	D
130	PAQIZE IMO 9457206	11,325	2010	193 m	MAK/Caterpillar - 9M43	31.9	D
131	ACACIA SEAWAYS IMO 9809112	11,978	2017	210 m	MAN - 8L48/60CR	32.1	D
132	TUNDRALAND IMO 9343273	13,800	2007	191 m	MAN - 9L48/60B	32.1	D
133	FINNTIDE IMO 9468920	14,509	2012	188 m	Wärtsilä - 8L46F	32.2	D
134	PAULINE RUSS IMO 9198989	7,296	1999	153 m	Wärtsilä - 16 V 46 B	32.3	D
135	MAGNOLIA SEAWAYS IMO 9259496	10,407	2003	200 m	MAN - 9L60MC-C	32.4	D
136	MERNA 1 IMO 8716954	3,966	1989	125 m	Wärtsilä - 12V32	32.4	D
137	SELANDIA SEAWAYS IMO 9157284	11,089	1998	197 m	Sulzer - 9ZA50S	32.7	D
138	GIUSEPPE LUCCHESI IMO 9503639	11,428	2012	193 m	MAK/Caterpillar - 9M43C	32.9	D
139	PELAGITIS IMO 7528611	8,661	1978	154 m	Nippon Kokan KK (NKK Corp) - Japan 12PC2-5V	33.0	D
140	BORE BAY IMO 9122007	7,330	1997	138 m	Wärtsilä - 16V46	33.1	D
141	EUROCARGO TRIESTE IMO 9468906	14,394	2012	187 m	Wärtsilä - 8L46F	33.3	D
142	EUROCARGO VALENCIA IMO 9468918	14,467	2012	188 m	Wärtsilä - 8L46F	33.3	D
143	LIDER EXPRESS IMO 8818312	6,934	1992	158 m	Wärtsilä - 6ZA40S	33.8	D
144	ABU SAMRAH IMO 9925655	12,089	2023	210 m	MAN - 8L48/60CR	33.8	D
145	CAPPADOCIA SEAWAYS IMO 9242388	9,865	2002	193 m	MAK/Caterpillar - 9M43	33.9	D
146	FINNWAVE IMO 9468932	14,498	2012	188 m	Wärtsilä - 8L46F	34.2	D
147	ADELINE IMO 9539092	6,730	2012	152 m	Wärtsilä - 16V32	34.2	D
148	GALLIPOLI SEAWAYS IMO 9215476	9,865	2001	193 m	MAK/Caterpillar - 9M43	34.5	D
149	LEEVSTEN IMO 9869954	11,930	2019	210 m	MAN - 8L48/60CR	35.0	D
150	EUROCARGO LIVORNO IMO 9471070	10,780	2012	200 m	MAN - 9L60MC-C	35.1	D

Page 3 of 5 — 214 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 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.