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 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.

Segment rank (2025)

#74 of 106 refrigerated cargos

CO₂ intensity

24.3 g CO₂/dwt·nm

vs segment average (21.89)

+11% 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

109

vessels ranked

7.59

greenest (g CO₂/t·nm)

22.69

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
51	COOL SPIRIT IMO 9765861	16,580	2018	189 m	Mitsui - 7S60ME-C8	22.3	C
52	BARRINGTON ISLAND IMO 9059614	14,140	1993	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	22.6	C
53	GREEN AUSTEVOLL IMO 8819299	6,000	1991	108 m	Wartsila Diesel Oy - Finland 12V32	22.6	C
54	COOL GIRL IMO 9194921	9,500	1999	143 m	Akasaka - 8UEC50LSII	22.6	C
55	TAGANROGSKIY ZALIV IMO 9152181	9,638	1997	143 m	Akasaka - 7UEC50LSII	22.7	C
56	BALTIC LORD IMO 9160724	12,912	2000	155 m	BRODOSPLIT - 7L60MC	22.8	C
57	COOL ROYAL IMO 9172959	12,900	2000	155 m	Hitachi - 8S50MC	22.8	C
58	BALTIC LADY IMO 9160736	12,913	2000	155 m	BRODOSPLIT - 7L60MC	22.9	C
59	PERUVIAN REEFER IMO 8917572	11,095	1992	140 m	MAN - 9L68/64	22.9	C
60	FRIO CHIKUMA IMO 9184536	8,097	1998	135 m	Akasaka - 8 UEC 45 LA	22.9	C
61	HELLAS STREAM IMO 9015187	13,930	1991	159 m	KAVASAKI HEAVY INDUSTRIES LTD. 8S60MC	22.9	C
62	ORANGE SEA IMO 9795971	7,737	2019	115 m	MAN - 5S35ME-B9	23.0	C
63	ELVIRA IMO 9202869	10,309	2000	152 m	Akasaka - 6UEC60LSII	23.0	C
64	BALTIC SUMMER IMO 8802090	12,350	1989	157 m	BREMER VULKAN AG SCHIFFBAU UND MASCHINENFABRIK 7 L 60 MC	23.0	D
65	SILVER DANIA IMO 8808604	5,353	1989	113 m	Bergen Diesel AS - Norway BRM8	23.1	D
66	GREEN GUATEMALA IMO 8912144	8,583	1992	131 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 7S50MC	23.4	D
67	DOLE AFRICA IMO 9046538	10,288	1994	150 m	Hyundai Heavy Industries Co Ltd - South Korea 6S60MC	23.7	D
68	FRIO STAR IMO 9172947	11,014	1998	150 m	Hitachi - 6S26MC	23.7	D
69	DOLE EUROPA IMO 9046514	10,288	1994	150 m	Hyundai - 6S60MC	23.7	D
70	DOLE ASIA IMO 9046526	10,288	1994	150 m	Hyundai Heavy Industries Co Ltd - South Korea 6S60MC	23.8	D
71	FEGULUS IMO 9055709	10,919	1993	150 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 6S60MC	23.9	D
72	ATLANTIC ACANTHUS IMO 9189897	11,793	1999	145 m	Mitsubishi - 7UEC52LS	24.2	D
73	CROWN SAPPHIRE IMO 9159115	10,334	1997	152 m	Mitsubishi - 6UEC60LSII	24.2	D
74	BALTIC HOLLYHOCK IMO 9189902	11,788	1999	145 m	Mitsubishi - 7UEC52LS	24.3	D
75	SIERRA QUEEN IMO 9127928	7,948	1996	134 m	MAK/Caterpillar - 6M552C	24.3	D
76	DOLE AMERICA IMO 9046502	10,288	1994	150 m	Hyundai - 6S60MC	24.5	D
77	ORIENTAL REEFER IMO 9158549	11,016	1998	138 m	Hitachi - 8S50MC	24.6	D
78	BOYANG BERING IMO 9851191	8,251	2019	134 m	MAN - 7L35MC	24.7	D
79	CROWN RUBY IMO 9159103	10,338	1997	152 m	Mitsubishi - 6UECC60LSII	25.0	D
80	BALTIC JASMINE IMO 9181156	10,114	1998	150 m	Mitsubishi - 7UEC50LSII	25.1	D
81	COLD STREAM IMO 9051791	10,086	1994	140 m	Mitsubishi - 8UEC50LSII	25.1	D
82	STAR SPIRIT IMO 9765847	16,565	2017	188 m	Mitsui - 7S60ME-C8	25.1	D
83	PACIFIC MERMAID IMO 9045924	10,466	1992	142 m	Hitachi - 7S50MC	25.4	D
84	LOMBOK STRAIT IMO 9204958	15,862	2002	167 m	Hyundai - 7S60MC-C	25.6	D
85	WILD PEONY IMO 9191474	10,110	1998	150 m	Mitsubishi - 7UEC50LSII	25.7	E
86	GREEN CRYSTAL IMO 8920995	6,000	1992	109 m	Wärtsilä - 12V32D	25.8	E
87	CROWN TOPAZ IMO 9191498	10,318	1999	152 m	Mitsubishi - 6UEC60LSII	25.8	E
88	CROWN JADE IMO 9128051	10,342	1997	152 m	Mitsubishi - 6UEC60LSII	25.8	E
89	LUZON STRAIT IMO 9204960	15,867	2002	167 m	Hyundai - 7S60MC-C	25.8	E
90	ATLANTIC KLIPPER IMO 9454761	15,692	2011	165 m	Hitachi - 6S60MC-C	26.0	E
91	WILD COSMOS IMO 9181132	10,139	1998	150 m	Mitsubishi - 7UEC50LSII	26.0	E
92	FRIO AEGEAN IMO 9172703	8,040	1998	130 m	Mitsubishi - 6UEC52LA	26.3	E
93	BALTIC PURPLE IMO 9143099	10,379	1996	154 m	Mitsui - 6L60MC	26.3	E
94	BALTIC KLIPPER IMO 9454759	15,609	2010	165 m	Hitachi - 6S60MC-C8	26.7	E
95	GREENSEA BERMEO IMO 9238703	7,614	2001	133 m	Wärtsilä - 6 L 46 C	26.8	E
96	BALTIC SPIRIT IMO 9765873	16,727	2018	188 m	Mitsui - 7S60ME-C8	27.1	E
97	GREEN COSTA RICA IMO 8912120	7,726	1992	131 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 7S50MC	27.1	E
98	CROWN GARNET IMO 9128049	10,334	1996	152 m	Mitsubishi - 6UEC60LSII	27.3	E
99	GREEN HONDURAS IMO 8912132	7,726	1992	131 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 7S50MC	27.7	E
100	CROWN OPAL IMO 9128063	10,316	1997	152 m	Mitsubishi - 6UEC60LSII	27.7	E

Page 2 of 3 — 106 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.