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)

#206 of 214 ro-ro cargos

CO₂ intensity

62.5 g CO₂/dwt·nm

vs segment average (31.83)

+96% 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
201	NEPTUNE DYNAMIS IMO 9240976	5,600	2002	158 m	Wärtsilä - 8 L 46 B	57.3	E
202	NEPTUNE AEGLI IMO 9240964	5,600	2002	158 m	Wärtsilä - 8 L 46 B	59.0	E
203	ARK DANIA IMO 9609964	6,551	2014	195 m	MAN - 8S40ME-B9	59.0	E
204	ARK GERMANIA IMO 9609952	6,551	2014	195 m	MAN - 8S40ME-B9	61.9	E
205	SEATRUCK PACE IMO 9350678	5,066	2009	142 m	Wärtsilä - 8L46	62.1	E
206	LIDER BULUT IMO 9198719	4,659	2000	142 m	MAN - 9L40/54	62.5	E
207	VILLE DE BORDEAUX IMO 9270842	5,291	2004	154 m	MAK/Caterpillar - 9M43	62.5	E
208	VILLA DE TAZACORTE IMO 9399325	10,140	2010	209 m	MAN - 9L48/60B	62.6	E
209	CITY OF HAMBURG IMO 9383558	3,500	2008	126 m	MAN - 8L32/40	63.3	E
210	BLUE CARRIER 1 IMO 9186649	4,650	2000	142 m	Sulzer - 8ZAL40S	63.3	E
211	ULYSSE IMO 9142459	5,250	1997	162 m	Sulzer - 6ZAL40S	63.7	E
212	SEATRUCK POWER IMO 9506215	5,600	2012	142 m	MAN - 7L48/60CR	65.2	E
213	SEATRUCK PRECISION IMO 9506239	5,600	2012	142 m	MAN - 7L48/60CR	65.2	E
214	SEATRUCK PROGRESS IMO 9506203	5,600	2011	142 m	MAN - 7L48/60CR	65.8	E

Page 5 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.