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)

#4 of 106 refrigerated cargos

CO₂ intensity

10.7 g CO₂/dwt·nm

vs segment average (21.89)

-51% greener

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
1	ORANGE STAR IMO 9564384	36,994	2011	190 m	BRODOSPLIT - 6S60MC-C	7.6	A
2	ORANGE SKY IMO 9228370	26,863	2000	172 m	Mitsubishi - 6UEC52LA	8.5	A
3	CITRUS VITA BRASIL IMO 9491836	34,966	2009	211 m	Doosan - 7L70ME-C	10.5	A
4	ORANGE OCEAN IMO 9675391	22,918	2014	170 m	Hyundai - 6S50ME-B9	10.7	A
5	ORANGE BLOSSOM 2 IMO 9675406	22,874	2014	170 m	Hyundai - 6S50ME-B9	10.7	A
6	CARLOS FISCHER IMO 9230995	43,067	2002	205 m	Sulzer - 7RTA84C	12.5	A
7	OURO DO BRASIL IMO 9018646	19,519	1993	172 m	Sulzer - 6RTA62	13.0	A
8	ORANGE WAVE IMO 9057123	16,700	1993	157 m	5S60MC	14.0	A
9	ICE GRACE IMO 8706777	14,932	1988	145 m	Sulzer - 6RTA52	14.8	A
10	PACIFIC REEFER IMO 9179268	17,283	1999	176 m	Mitsubishi - 8UEC50LSII	16.1	A
11	ACONCAGUA BAY IMO 9019652	11,581	1992	149 m	Mitsubishi - 6UEC52LA	16.1	A
12	ORANGE FROST IMO 9797656	8,726	2018	137 m	MAN - 6S35MC7	16.4	A
13	ATLANTIC REEFER IMO 9179256	17,178	1998	176 m	Mitsubishi - 8UEC50LSII	16.5	A
14	RUNAWAY BAY IMO 9019640	11,581	1992	149 m	Mitsubishi - 6UEC52LA	16.8	A
15	ORANGE STRAIT IMO 9795995	7,737	2019	115 m	YANMAR - 5S35ME-B9	17.1	A
16	IVAR IMO 8819938	16,950	1990	164 m	KHIC 6L60MCE	17.3	A
17	SWEDISH STREAM IMO 9030149	13,930	1992	158 m	Kawasaki - 8SC60MC	18.3	A
18	COTE D IVOIRE EXPRESS IMO 9983994	14,547	2024	158 m	6UEC50LSH-Eco3-coEGR	18.4	A
19	SENEGAL EXPRESS IMO 9984015	14,567	2025	158 m	Japan Engine Corp - Akashi 6UEC50LSH-Eco3-coEGR	18.4	A
20	CAMEROUN EXPRESS IMO 9983865	14,565	2024	158 m	6UEC50LSH-Eco3-coEGR	18.5	A
21	ORANGE ICE IMO 9797917	8,751	2018	137 m	Hanshin - 6S35MC7	18.7	A
22	AUTUMN STREAM IMO 9038323	13,981	1993	158 m	Hyundai Heavy Industries Co Ltd - South Korea 7L60MC	18.7	B
23	COOL EXPRESS IMO 9836878	22,715	2018	190 m	MAN - 7G60ME-C9	18.8	B
24	GHANA EXPRESS IMO 9984003	14,552	2025	158 m	Japan Engine Corp - Akashi 6UEC50LSH-EcoC3-coEGR	19.1	B
25	COSTA RICAN STAR IMO 9150822	14,726	1998	185 m	Mitsui - 6L60MC	19.4	B
26	CALA PEDRA IMO 9164782	16,090	2000	190 m	Sulzer - 8RTA62U	19.6	B
27	COOL EXPLORER IMO 9836880	23,169	2019	190 m	MAN - 7G60ME-C9	19.6	B
28	REGAL BAY IMO 9053658	10,520	1993	150 m	Mitsui - 6DKPH45/120	19.6	B
29	BALTIC SPRING IMO 8909070	12,350	1991	157 m	BREMER VULKAN AG SCHIFFBAU UND MASCHINENFABRIK 7 L 60 MC	19.7	B
30	CARIBBEAN STAR IMO 9150810	14,726	1997	185 m	Mitsui - 6L60MC	20.0	B
31	CALA PULA IMO 9164768	16,090	1999	190 m	Sulzer - 8RTA62U	20.0	B
32	CHARLES ISLAND IMO 9059626	14,140	1993	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	20.1	B
33	ORANGE STREAM IMO 9795983	7,738	2019	115 m	MAN - 5S35ME-B9	20.1	B
34	CALA PINO IMO 9164756	16,090	1999	190 m	Sulzer - 7RTA62U	20.2	B
35	EMERALD IMO 9202857	12,375	2000	152 m	Akasaka - 6UEC60LSII	20.3	B
36	COTE D'IVOIRIAN STAR IMO 9172478	14,815	1998	185 m	Mitsui - 6S60MC	20.4	B
37	SEIN TOPAZ IMO 9047245	8,044	1993	134 m	Mitsubishi - 8UEC45LA	20.5	B
38	DUNCAN ISLAND IMO 9059638	14,140	1993	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	20.6	B
39	DITLEV IMO 8819926	16,950	1990	164 m	KHIC 6L60MC	20.8	B
40	HOOD ISLAND IMO 9059640	14,140	1994	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	20.9	B
41	CALA PALMA IMO 9164770	16,090	2000	190 m	Sulzer - 8RTA62U	21.1	B
42	KANO REEFER IMO 9194957	9,566	1999	143 m	Mitsubishi - 8UEC50LSII	21.1	B
43	BALTIC ERICA IMO 9194476	11,791	1999	145 m	Mitsubishi - 7UEC52LS	21.3	C
44	DUNEDIN STAR IMO 9038945	11,793	1994	151 m	MAN - 9L58/64	21.4	C
46	ALBEMARLE ISLAND IMO 9059602	14,160	1993	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	21.4	C
45	COLOMBIAN STAR IMO 9172480	13,900	1998	185 m	Mitsui - 6S60MC	21.4	C
47	STAR COURAGE IMO 9765859	16,543	2017	189 m	Mitsui - 7S60ME-C8	21.6	C
48	GREEN BRAZIL IMO 9045792	8,647	1994	131 m	Mitsui - 7 S 50 MC	21.8	C
49	PRINCE OF SEAS IMO 9014444	7,387	1993	130 m	Akasaka - 6UEC45LA	22.0	C
50	ITALIA STREAM IMO 9030137	13,930	1992	158 m	Kawasaki - 8S60MC	22.2	C

Page 1 of 3 — 106 vessels

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.