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)

#202 of 220 ro-ro cargos

CO₂ intensity

49.4 g CO₂/dwt·nm

vs segment average (30.55)

+62% 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

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
201	MYKINES IMO 9121998	6,047	1996	139 m	Wärtsilä - 16V46	48.8	E
202	SIGRID IMO 9631840	2,530	2013	100 m	MaK 6M20C	49.4	E
203	AUTOSKY IMO 9206774	6,670	2000	140 m	Wärtsilä - 8L46C	50.1	E
204	AUTOPRESTIGE IMO 9190157	4,311	1999	129 m	Wärtsilä - 12V32E	50.5	E
205	EOS IMO 9132014	8,936	1998	154 m	Wärtsilä - 16 V 46 B	51.6	E
206	VILLE DE BORDEAUX IMO 9270842	5,291	2004	154 m	MAK/Caterpillar - 9M43	52.8	E
207	ARK DANIA IMO 9609964	6,551	2014	195 m	MAN - 8S40ME-B9	52.9	E
208	ARK GERMANIA IMO 9609952	6,551	2014	195 m	MAN - 8S40ME-B9	53.5	E
209	CAESAREA TRADER IMO 9117985	5,215	1996	126 m	MAK/Caterpillar - 6M552C	54.8	E
210	NEPTUNE DYNAMIS IMO 9240976	5,600	2002	158 m	Wärtsilä - 8 L 46 B	55.5	E
211	VILLA DE TAZACORTE IMO 9399325	10,140	2010	209 m	MAN - 9L48/60B	56.7	E
212	NEPTUNE AEGLI IMO 9240964	5,600	2002	158 m	Wärtsilä - 8 L 46 B	56.9	E
213	POWER IMO 9506215	5,600	2012	142 m	MAN - 7L48/60CR	57.2	E
214	CITY OF HAMBURG IMO 9383558	3,500	2008	126 m	MAN - 8L32/40	59.5	E
215	PRECISION IMO 9506239	5,600	2012	142 m	MAN - 7L48/60CR	60.6	E
216	BOUZAS IMO 9249996	4,695	2002	142 m	MAN - 9L40/54	60.6	E
217	CIUDAD DE CADIZ IMO 9383560	3,500	2009	126 m	MAN - 8L32/40	62.0	E
218	PROGRESS IMO 9506203	5,600	2011	142 m	MAN - 7L48/60CR	64.5	E
219	BLUE CARRIER 1 IMO 9186649	4,650	2000	142 m	Sulzer - 8ZAL40S	64.6	E
220	NIVIN IMO 8206533	1,626	1983	89 m	ASTILLEROS - 6 PC 2-5 L	65.9	E

Page 5 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.