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)

#103 of 220 ro-ro cargos

CO₂ intensity

27.0 g CO₂/dwt·nm

vs segment average (30.55)

-12% 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
101	FINNECO II IMO 9856842	17,389	2022	238 m	UnKnown 9S50ME-C9	26.8	C
102	PAULINE IMO 9324473	17,023	2006	203 m	MAK/Caterpillar - 12M43	26.9	C
103	FERRYMAR IMO 9966805	6,726	2023	120 m	MAN 6L27/38	27.0	C
104	LAKEWAY EXPRESS IMO 9183790	7,440	1999	153 m	Wärtsilä - 12V46C	27.5	C
105	TRANSPORTER IMO 8820858	5,387	1991	122 m	Wärtsilä - 16V32D	27.6	C
106	FINNECO III IMO 9856854	17,309	2022	238 m	UnKnown 9S50ME-C9	27.8	C
107	ECO BARCELONA IMO 9859545	18,079	2021	238 m	Hyundai Heavy Industries Co Ltd - South Korea 9S50ME-C9	28.0	C
108	THULELAND IMO 9343261	13,800	2006	191 m	MAN - 9L48/60B	28.1	C
109	FREESIA SEAWAYS IMO 9274848	14,330	2005	230 m	MAN - 9L60MC-C	28.1	C
110	POL STELLA IMO 9457165	11,555	2009	193 m	MAK/Caterpillar - 9M43	28.2	C
111	CARIBBEAN FORCE IMO 9335161	7,342	2007	145 m	MAK/Caterpillar - 12M32C	28.3	C
112	PAULINE RUSS IMO 9198989	7,296	1999	153 m	Wärtsilä - 16 V 46 B	28.3	C
113	ULUSOY-16 IMO 9809095	10,310	2017	210 m	MAN - 8L48/60CR	28.7	C
114	JOLLY EXPRESS IMO 9180190	11,203	1999	184 m	Wärtsilä - R32	28.9	C
115	MSC BRIDGE IMO 9138783	13,018	1998	183 m	Sulzer - 8ZA40S	28.9	C
116	GRENDI FUTURA IMO 9687306	11,585	2014	179 m	MAN - 9L32/44CR	29.0	C
117	MELUSINE IMO 9166637	9,729	1999	162 m	MAN - 7L40/54	29.1	C
118	BEGONIA SEAWAYS IMO 9262089	14,424	2004	230 m	MAN - 9L60MC-C	29.3	C
119	EUROCARGO TRIESTE IMO 9468906	14,394	2012	187 m	Wärtsilä - 8L46F	29.6	C
120	VICTORINE IMO 9184029	9,755	2000	162 m	MAN - 7L40/54	29.6	C
121	BLUE CARRIER 2 IMO 9125384	9,655	1997	162 m	MAN - 7L40/54	29.7	C
122	STENA FORERUNNER IMO 9227259	12,300	2003	195 m	Sulzer - ZA40S	29.7	C
123	CANOPEE IMO 9924120	5,491	2022	121 m	Wärtsilä - 6L32DF	29.9	C
124	SEA CARYATIS IMO 9166625	9,729	1999	162 m	MAN - 7L40/54	29.9	C
125	FRANCESCO NULLO IMO 9457189	11,555	2010	193 m	MAK/Caterpillar - 9M43	30.1	C
126	NORSTREAM IMO 9186194	11,585	1999	180 m	Wärtsilä - 9 L 46 C	30.3	C
127	ARTEMIS SEAWAYS IMO 9293428	11,636	2005	193 m	MAK/Caterpillar - 9M43	30.4	C
128	BORE BAY IMO 9122007	7,330	1997	138 m	Wärtsilä - 16V46	30.4	C
129	PERGAMON SEAWAYS IMO 9506277	13,230	2013	208 m	MAN - 7L48/60CR	30.7	C
130	STENA SHIPPER IMO 9503639	11,428	2012	193 m	MAK/Caterpillar - 9M43C	30.8	C
131	PRIMULA SEAWAYS IMO 9259513	14,012	2004	230 m	MAN - 9L60MC-C	30.8	C
132	CELANDINE IMO 9183984	9,415	2000	162 m	MAN - 7L40/54	30.9	C
133	FADIQ IMO 9809590	11,978	2017	210 m	MAN - 8L48/60CR	31.0	D
134	TULIPA SEAWAYS IMO 9809100	11,917	2017	210 m	Wärtsilä - 8L48/60CR	31.1	D
135	ASPENDOS SEAWAYS IMO 9322425	11,636	2005	193 m	MAK/Caterpillar - 9M43	31.1	D
136	ASSOS SEAWAYS IMO 9293416	11,636	2005	193 m	MAK/Caterpillar - 9M43	31.1	D
137	MAGNOLIA SEAWAYS IMO 9259496	10,407	2003	200 m	MAN - 9L60MC-C	31.2	D
138	DARDANELLES SEAWAYS IMO 9322437	11,636	2006	193 m	MAK/Caterpillar - 9M43	31.2	D
139	FINNTIDE IMO 9468920	14,509	2012	188 m	Wärtsilä - 8L46F	31.3	D
140	SELANDIA SEAWAYS IMO 9157284	11,089	1998	197 m	Sulzer - 9ZA50S	31.3	D
141	NORSKY IMO 9186182	11,564	1999	180 m	Wärtsilä - 9 L 46 C	31.7	D
142	SEA-CARGO EXPRESS IMO 9358060	4,894	2012	117 m	Wärtsilä - 9L32	31.7	D
143	ACACIA SEAWAYS IMO 9809112	11,978	2017	210 m	MAN - 8L48/60CR	31.8	D
144	PAQIZE IMO 9457206	11,325	2010	193 m	MAK/Caterpillar - 9M43	31.9	D
145	FINNBREEZE IMO 9468889	14,467	2011	188 m	Wärtsilä - 8L46F	32.1	D
146	FRIEDRICH RUSS IMO 9186417	7,296	1999	153 m	Wärtsilä - 12V46C	32.3	D
147	FINNSEA IMO 9468891	14,467	2011	188 m	Wärtsilä - 8L46F	32.4	D
148	LEEVSTEN IMO 9869954	11,930	2019	210 m	MAN - 8L48/60CR	32.6	D
149	AURORA IMO 8911736	7,394	1991	140 m	Wärtsilä - 16V32D	32.6	D
150	ADELINE IMO 9539092	6,730	2012	152 m	Wärtsilä - 16V32	33.1	D

Page 3 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.