Most Emission-Efficient Refrigerated 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)

#112 of 114 refrigerated cargos

CO₂ intensity

29.7 g CO₂/dwt·nm

vs segment average (21.83)

+36% 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

117

vessels ranked

7.67

greenest (g CO₂/t·nm)

22.43

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
101	LUZON STRAIT IMO 9204960	15,867	2002	167 m	Hyundai - 7S60MC-C	26.2	E
102	DOLE ASIA IMO 9046526	10,288	1994	150 m	Hyundai Heavy Industries Co Ltd - South Korea 6S60MC	26.4	E
103	SIERRA QUEEN IMO 9127928	7,948	1996	134 m	MAK/Caterpillar - 6M552C	26.5	E
104	DOLE AFRICA IMO 9046538	10,288	1994	150 m	Hyundai Heavy Industries Co Ltd - South Korea 6S60MC	26.5	E
105	CS SERVICE IMO 9438482	13,073	2008	162 m	MAN - 7S60MC-C	26.9	E
106	CROWN JADE IMO 9128051	10,342	1997	152 m	Mitsubishi - 6UEC60LSII	27.3	E
107	GREEN HONDURAS IMO 8912132	7,726	1992	131 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 7S50MC	28.7	E
108	GREENSEA BERMEO IMO 9238703	7,614	2001	133 m	Wärtsilä - 6 L 46 C	28.9	E
109	FRIO CHIKUMA IMO 9184536	8,097	1998	135 m	Akasaka - 8 UEC 45 LA	29.0	E
110	SIERRA LARA IMO 9120205	5,970	1996	117 m	Manises Diesel Engine Co. S.A. - Valencia 7S35MC	29.2	E
111	GREEN CHILE IMO 8912156	8,647	1992	131 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 7S50MC	29.7	E
112	SAVANNA WIND IMO 9791286	5,102	2020	128 m	Wartsila Finland Oy 6L-32	30.4	E
113	NOVIY SVET IMO 8509557	6,232	1990	124 m	H. CEGIELSKI-POZNAN S.A. 6 L 50 MCE	40.7	E
114	ARCTIC SPIRIT IMO 8907204	6,807	1991	120 m	Sulzer - 5RTA52	46.0	E

Page 3 of 3 — 114 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.