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)

#76 of 114 refrigerated cargos

CO₂ intensity

23.9 g CO₂/dwt·nm

vs segment average (21.83)

+10% 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
51	HELLAS STREAM IMO 9015187	13,930	1991	159 m	KAVASAKI HEAVY INDUSTRIES LTD. 8S60MC	21.5	C
52	ORANGE SEA IMO 9795971	7,737	2019	115 m	MAN - 5S35ME-B9	21.5	C
53	EMERALD IMO 9202857	12,375	2000	152 m	Akasaka - 6UEC60LSII	21.7	C
54	BALTIC ERICA IMO 9194476	11,791	1999	145 m	Mitsubishi - 7UEC52LS	21.7	C
55	BALTIC PEARL IMO 9008732	10,713	1991	150 m	MAN - 6S60MC	21.8	C
56	SWEDISH STREAM IMO 9030149	13,930	1992	158 m	Kawasaki - 8SC60MC	22.2	C
57	PACIFIC MERMAID IMO 9045924	10,466	1992	142 m	Hitachi - 7S50MC	22.3	C
58	FRIO MARATHON IMO 8916229	7,242	1990	146 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 6L50MC	22.4	C
59	BALTIC HEATHER IMO 9181144	10,114	1998	150 m	Mitsubishi - 7UEC50LSII	22.4	C
60	ITALIA STREAM IMO 9030137	13,930	1992	158 m	Kawasaki - 8S60MC	22.5	C
61	BALTIC PATRIOT IMO 9038488	10,621	1992	150 m	Mitsui - 6S60MC	22.5	C
62	GREEN BRAZIL IMO 9045792	8,647	1994	131 m	Mitsui - 7 S 50 MC	22.7	C
63	GREEN CRYSTAL IMO 8920995	6,000	1992	109 m	Wärtsilä - 12V32D	22.7	C
64	NEDERLAND STREAM IMO 9015199	13,958	1991	158 m	Kawasaki - 8S60MC	22.8	C
65	CROWN SAPPHIRE IMO 9159115	10,334	1997	152 m	Mitsubishi - 6UEC60LSII	22.9	C
66	WATER PHOENIX IMO 9045168	7,947	1992	134 m	Mitsubishi - 8UEC45LA	23.2	C
67	GREEN GUATEMALA IMO 8912144	8,583	1992	131 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 7S50MC	23.3	C
68	DUNEDIN STAR IMO 9038945	11,793	1994	151 m	MAN - 9L58/64	23.3	C
69	DOLE AMERICA IMO 9046502	10,288	1994	150 m	Hyundai - 6S60MC	23.4	D
70	WILD PEONY IMO 9191474	10,110	1998	150 m	Mitsubishi - 7UEC50LSII	23.4	D
71	SIERRA LAUREL IMO 9163403	5,937	1998	117 m	MAN B&W Diesel A/S - Denmark 7S35MC	23.6	D
72	CHARLES ISLAND IMO 9059626	14,140	1993	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	23.6	D
73	COLD STREAM IMO 9051791	10,086	1994	140 m	Mitsubishi - 8UEC50LSII	23.9	D
74	SILVER DANIA IMO 8808604	5,353	1989	113 m	Bergen Diesel AS - Norway BRM8	23.9	D
75	DOLE EUROPA IMO 9046514	10,288	1994	150 m	Hyundai - 6S60MC	23.9	D
76	CALLISTO IMO 9073402	8,024	1993	134 m	Mitsubishi - 8UEC45LA	23.9	D
77	GREEN AUSTEVOLL IMO 8819299	6,000	1991	108 m	Wartsila Diesel Oy - Finland 12V32	23.9	D
78	BALTIC LADY IMO 9160736	12,913	2000	155 m	BRODOSPLIT - 7L60MC	24.0	D
79	INVINCIBLE IMO 9181170	10,358	1999	152 m	Akasaka - 6UEC60LSII	24.0	D
80	WILD LOTUS IMO 9181168	10,139	1998	150 m	Akasaka - 7UEC50LSII	24.4	D
81	BALTIC PURPLE IMO 9143099	10,379	1996	154 m	Mitsui - 6L60MC	24.5	D
82	LAGOON PHOENIX IMO 9047245	8,044	1993	134 m	Mitsubishi - 8UEC45LA	24.5	D
83	ORANGE STREAM IMO 9795983	7,738	2019	115 m	MAN - 5S35ME-B9	24.8	D
84	FRIO STAR IMO 9172947	11,014	1998	150 m	Hitachi - 6S26MC	24.9	D
85	COOL MAGNUS IMO 9167801	12,906	2000	155 m	Hitachi - 8S50MC	24.9	D
86	SAVANNA BREEZE IMO 9791274	5,903	2019	128 m	Wartsila Finland Oy 6L-32	25.0	D
87	GREEN EGERSUND IMO 8804567	6,120	1990	109 m	Wärtsilä - 12V32D	25.0	D
88	LOMBOK STRAIT IMO 9204958	15,862	2002	167 m	Hyundai - 7S60MC-C	25.1	D
89	COOL ROYAL IMO 9172959	12,900	2000	155 m	Hitachi - 8S50MC	25.2	D
90	BALTIC JASMINE IMO 9181156	10,114	1998	150 m	Mitsubishi - 7UEC50LSII	25.2	D
91	KANO REEFER IMO 9194957	9,566	1999	143 m	Mitsubishi - 8UEC50LSII	25.3	D
92	WELLINGTON STAR IMO 8917584	11,103	1992	140 m	MAN - 9L58/64	25.3	E
93	STAR SPIRIT IMO 9765847	16,565	2017	188 m	Mitsui - 7S60ME-C8	25.7	E
94	ATLANTIC KLIPPER IMO 9454761	15,692	2011	165 m	Hitachi - 6S60MC-C	25.8	E
95	WILD COSMOS IMO 9181132	10,139	1998	150 m	Mitsubishi - 7UEC50LSII	25.9	E
96	ELVIRA IMO 9202869	10,309	2000	152 m	Akasaka - 6UEC60LSII	26.0	E
97	PRINCE OF SEAS IMO 9014444	7,387	1993	130 m	Akasaka - 6UEC45LA	26.0	E
98	BALTIC KLIPPER IMO 9454759	15,609	2010	165 m	Hitachi - 6S60MC-C8	26.0	E
99	CROWN GARNET IMO 9128049	10,334	1996	152 m	Mitsubishi - 6UEC60LSII	26.1	E
100	CROWN OPAL IMO 9128063	10,316	1997	152 m	Mitsubishi - 6UEC60LSII	26.1	E

Page 2 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.