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)

#40 of 114 refrigerated cargos

CO₂ intensity

20.4 g CO₂/dwt·nm

vs segment average (21.83)

-7% 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

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
1	ORANGE STAR IMO 9564384	36,994	2011	190 m	BRODOSPLIT - 6S60MC-C	7.7	A
2	ORANGE SKY IMO 9228370	26,863	2000	172 m	Mitsubishi - 6UEC52LA	8.5	A
3	ORANGE SUN IMO 9342580	43,420	2007	205 m	MAN - 7S60MC-C	9.5	A
4	ORANGE OCEAN IMO 9675391	22,918	2014	170 m	Hyundai - 6S50ME-B9	10.2	A
5	CITRUS VITA BRASIL IMO 9491836	34,966	2009	211 m	Doosan - 7L70ME-C	10.9	A
6	CARLOS FISCHER IMO 9230995	43,067	2002	205 m	Sulzer - 7RTA84C	11.6	A
7	PREMIUM DO BRASIL IMO 9242089	43,002	2003	205 m	Sulzer - 7RTA84C	11.9	A
8	ORANGE BLOSSOM 2 IMO 9675406	22,874	2014	170 m	Hyundai - 6S50ME-B9	13.2	A
9	SOL DO BRASIL IMO 9018658	19,463	1994	172 m	Sulzer - 6RTA62	13.5	A
10	ORANGE WAVE IMO 9057123	16,700	1993	157 m	5S60MC	14.0	A
11	JORGEN REEFER IMO 9007489	16,950	1991	164 m	KHIC 6L60MCE	14.6	A
12	PACIFIC REEFER IMO 9179268	17,283	1999	176 m	Mitsubishi - 8UEC50LSII	15.2	A
13	ATLANTIC REEFER IMO 9179256	17,178	1998	176 m	Mitsubishi - 8UEC50LSII	15.5	A
14	ORANGE FROST IMO 9797656	8,726	2018	137 m	MAN - 6S35MC7	16.2	A
15	ACONCAGUA BAY IMO 9019652	11,581	1992	149 m	Mitsubishi - 6UEC52LA	16.3	A
16	REGAL BAY IMO 9053658	10,520	1993	150 m	Mitsui - 6DKPH45/120	16.7	A
17	RUNAWAY BAY IMO 9019640	11,581	1992	149 m	Mitsubishi - 6UEC52LA	17.6	A
18	STAR COURAGE IMO 9765859	16,543	2017	189 m	Mitsui - 7S60ME-C8	17.8	A
19	ORANGE STRAIT IMO 9795995	7,737	2019	115 m	YANMAR - 5S35ME-B9	17.8	A
20	COSTA RICAN STAR IMO 9150822	14,726	1998	185 m	Mitsui - 6L60MC	18.0	A
21	CARIBBEAN STAR IMO 9150810	14,726	1997	185 m	Mitsui - 6L60MC	18.1	A
22	IVAR REEFER IMO 8819938	16,950	1990	164 m	KHIC 6L60MCE	18.4	A
23	COOL GIRL IMO 9194921	9,500	1999	143 m	Akasaka - 8UEC50LSII	18.4	A
24	AUTUMN STREAM IMO 9038323	13,981	1993	158 m	Hyundai Heavy Industries Co Ltd - South Korea 7L60MC	18.5	B
25	CALA PEDRA IMO 9164782	16,090	2000	190 m	Sulzer - 8RTA62U	18.6	B
26	COTE D IVOIRE EXPRESS IMO 9983994	14,547	2024	158 m	6UEC50LSH-Eco3-coEGR	18.7	B
27	ORANGE SPIRIT IMO 9795969	7,768	2018	115 m	Yichang - 5S35ME-B9	18.7	B
28	ATLANTIC ACANTHUS IMO 9189897	11,793	1999	145 m	Mitsubishi - 7UEC52LS	19.1	B
29	DITLEV REEFER IMO 8819926	16,950	1990	164 m	KHIC 6L60MC	19.1	B
30	CAMEROUN EXPRESS IMO 9983865	14,565	2024	158 m	6UEC50LSH-Eco3-coEGR	19.1	B
31	DUNCAN ISLAND IMO 9059638	14,140	1993	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	19.3	B
32	BALTIC SPRING IMO 8909070	12,350	1991	157 m	BREMER VULKAN AG SCHIFFBAU UND MASCHINENFABRIK 7 L 60 MC	19.3	B
33	BARRINGTON ISLAND IMO 9059614	14,140	1993	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	19.3	B
34	COTE D'IVOIRIAN STAR IMO 9172478	14,815	1998	185 m	Mitsui - 6S60MC	19.5	B
35	COLOMBIAN STAR IMO 9172480	13,900	1998	185 m	Mitsui - 6S60MC	19.5	B
36	HOOD ISLAND IMO 9059640	14,140	1994	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	19.7	B
37	BALTIC WINTER IMO 9014755	12,890	1992	156 m	BREMER VULKAN AG 7L60MC	19.9	B
38	BALTIC SUMMER IMO 8802090	12,350	1989	157 m	BREMER VULKAN AG SCHIFFBAU UND MASCHINENFABRIK 7 L 60 MC	20.3	B
39	FUJI BAY IMO 8920141	11,540	1990	148 m	Mitsubishi - 6UEC52LA	20.4	B
40	BALTIC PERFORMER IMO 9016674	10,603	1992	150 m	Mitsui - 6S60MCE	20.5	B
41	TAGANROGSKIY ZALIV IMO 9152181	9,638	1997	143 m	Akasaka - 7UEC50LSII	20.5	B
42	CALA PULA IMO 9164768	16,090	1999	190 m	Sulzer - 8RTA62U	20.6	B
43	BALTIC HOLLYHOCK IMO 9189902	11,788	1999	145 m	Mitsubishi - 7UEC52LS	20.6	B
44	CALA PINO IMO 9164756	16,090	1999	190 m	Sulzer - 7RTA62U	20.6	B
45	ORIENTAL REEFER IMO 9158549	11,016	1998	138 m	Hitachi - 8S50MC	20.6	B
46	FEGULUS IMO 9055709	10,919	1993	150 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 6S60MC	20.7	B
47	ORANGE ICE IMO 9797917	8,751	2018	137 m	Hanshin - 6S35MC7	20.8	C
48	CALA PALMA IMO 9164770	16,090	2000	190 m	Sulzer - 8RTA62U	20.9	C
49	OURO DO BRASIL IMO 9018646	19,519	1993	172 m	Sulzer - 6RTA62	21.0	C
50	ALBEMARLE ISLAND IMO 9059602	14,160	1993	178 m	Mitsui Engineering & Shipbuilding C Ltd - Japan 8S60MC	21.3	C

Page 1 of 3 — 114 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 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.