Most Emission-Efficient Container Ships

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)

#1,338 of 2,221 container ships

CO₂ intensity

9.4 g CO₂/dwt·nm

vs segment average (9.9)

-5% 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 (TEU)

All sizes < 3,000 TEU 3k – 8k TEU 8k – 14k TEU > 14,000 TEU

Year

2025 2024

2,267

vessels ranked

2.88

greenest (g CO₂/t·nm)

8.38

segment median

#	Vessel	Size (TEU)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
1301	CONTI CORTESIA IMO 9293753	8,084 TEU	2005	334 m	Sulzer - 12RTA96C	9.2	C
1302	MSC ROMA IMO 9304447	9,200 TEU	2006	337 m	MAN - 12K98MC-C	9.2	C
1303	X-PRESS SALWEEN IMO 9862748	1,800 TEU	2021	172 m	Hudong Heavy Machinery Co. Ltd. 6S60ME-C10	9.2	C
1304	VAGA MAERSK IMO 9778545	3,700 TEU	2019	200 m	MAN - 6G60ME-C9	9.2	C
1305	MSC POLARIS IMO 9074042	4,743 TEU	1995	300 m	Mitsubishi - 12RTA84C	9.2	C
1306	MAERSK MONTE LINZOR IMO 9283186	4,000 TEU	2004	272 m	Wärtsilä - 8RTA96C	9.2	C
1307	CMA CGM FRANCOISE SAGAN IMO 9356696	6,661 TEU	2008	304 m	Hyundai - 11K98ME-C	9.2	C
1308	MAERSK NOKWANDA IMO 9294393	4,045 TEU	2005	266 m	Sulzer - 8RT-flex96C	9.2	C
1309	MSC CARPATHIA III IMO 9253038	2,826 TEU	2003	222 m	Hyundai - 7K80MC-C	9.2	C
1310	STANLEY A IMO 9303807	2,824 TEU	2003	222 m	Hyundai - 7K80MC-C	9.2	C
1311	MAERSK OHIO IMO 9298698	4,300 TEU	2006	292 m	Hyundai - 10K90MC-C	9.2	C
1312	PORTO KAGIO IMO 9261451	4,492 TEU	2002	279 m	Diesel United - 10K98MC-VI	9.2	C
1313	SEATRADE COLOMBIA IMO 9976238	23,800	2025	172 m	MAN-B&W 6S60ME-C10	9.2	C
1314	MED TRABZON IMO 9141780	2,052 TEU	1997	182 m	DIESELMOTORENWERK VULKAN GMBH WERK ROSTOCK 6 S 60 MC	9.2	C
1315	VUOKSI MAERSK IMO 9775775	3,600 TEU	2018	200 m	MAN - 6S70ME-C8	9.2	C
1316	CMA CGM SINTRA IMO 9961362	2,000 TEU	2024	204 m	6S60ME-C10-GI	9.3	C
1317	JOLLY GIADA IMO 9484522	4,400 TEU	2010	260 m	Doosan - 8K90MC-C	9.3	C
1318	CMA CGM LA TRAVIATA IMO 9299795	8,200 TEU	2006	334 m	Hyundai - 12 K98MC	9.3	C
1319	HYUNDAI SINGAPORE IMO 9305685	6,763 TEU	2006	304 m	MAN - 12K98MC-C	9.3	C
1320	PAOLO IMO 9389681	4,250 TEU	2008	260 m	MAN - 8K90MC-C	9.3	C
1321	SC MONTREUX IMO 9295414	4,132 TEU	2005	264 m	Hyundai - 9 K 90 MC-C	9.3	C
1322	SEATTLE C IMO 9360910	4,253 TEU	2007	260 m	Doosan - 8K90MC-C	9.3	C
1323	CMA CGM GUARANI IMO 9234135	2,470 TEU	2002	207 m	Wärtsilä - 7 RTA 72 U-B	9.3	C
1324	OOCL KOBE IMO 9329526	4,506 TEU	2007	260 m	Doosan - 8K90MC-C	9.3	C
1325	MSC MADRID IMO 9480198	5,550 TEU	2011	270 m	MAN - 7K98MC-C	9.3	C
1326	GSL MYNY IMO 9213583	5,514 TEU	2000	277 m	SAMSUNG HEAVY INDUSTRIES CO., LTD. 12 K 90 MC	9.3	C
1327	RAMHAN IMO 9668960	3,100 TEU	2015	239 m	MAN - 7L70ME-C8	9.4	C
1328	CAPE SKAGEN IMO 9969857	2,713 TEU	2023	189 m	7S60ME-C10-HPSCR	9.4	C
1329	CMA CGM MONTREAL IMO 9363417	2,401 TEU	2007	200 m	MAN - 7S70MC-C	9.4	C
1330	SHEKOU STAR IMO 9322322	4,250 TEU	2007	260 m	MAN - 8K90MC-C	9.4	C
1331	MSC HIMANSHI IMO 9127540	2,006 TEU	1997	188 m	Sulzer - 6RTA72U	9.4	C
1332	LEDA MAERSK IMO 9190755	4,045 TEU	2001	266 m	Doosan - 10K90MC	9.4	C
1333	GABRIEL A IMO 9300659	1,676 TEU	2004	156 m	MAN - 7S50MC-C	9.4	D
1334	MAERSK MONTANA IMO 9305312	4,300 TEU	2006	292 m	Hyundai - 10K90MC-C	9.4	D
1335	PANDA 001 IMO 9290787	5,527 TEU	2005	276 m	Sulzer - 10RTA96C	9.4	D
1336	MSC CAPRI IMO 9154220	2,456 TEU	1998	208 m	Sulzer - 6RTA72U	9.4	D
1337	REMAH IMO 9947720	1,692 TEU	2022	172 m	China Shipbuilding Industry Co Diesel Engine Co Ltd 6S60ME-C10.5	9.4	D
1338	ZIM VIRGINIA IMO 9231808	4,800 TEU	2002	294 m	Hyundai - HYUNDAI - MAN B&W 9K90MC-C	9.4	D
1339	CMA CGM SPIRIT IMO 9372860	3,400 TEU	2008	229 m	Hitachi - 8 K80MC-C	9.4	D
1340	KINGSTON IMO 9389693	4,250 TEU	2008	260 m	MAN - 8K90MC-C	9.4	D
1341	CMA CGM TOPAZ IMO 9397602	4,300 TEU	2009	260 m	Doosan - 8K90MC-C	9.4	D
1342	MSC MARIA PIA IMO 9155107	2,808 TEU	1997	196 m	Hyundai - 8 RTA 72 U	9.4	D
1343	MSC BREMEN IMO 9369734	5,029 TEU	2007	294 m	Wärtsilä - 8RT-flex96C	9.4	D
1344	CAPE SABLE IMO 9950131	2,700 TEU	2024	189 m	7S60ME-C10-HPSCR	9.4	D
1345	CALI IMO 9631101	3,610 TEU	2013	228 m	Hyundai - 7S70ME-C	9.4	D
1346	MSC DYMPHNA IMO 9110391	5,711 TEU	1996	275 m	MAN - 12K90MC-C	9.4	D
1347	LEXA MAERSK IMO 9190767	3,700 TEU	2001	266 m	10K90MC	9.5	D
1348	MSC ELIZABETH III IMO 9215892	2,556 TEU	2001	210 m	Hyundai - 7 RTA 72 U-B	9.5	D
1349	STADT DRESDEN IMO 9320049	2,700 TEU	2006	222 m	MAN - 7L70MC-C	9.5	D
1350	CAPE CITIUS IMO 9848742	2,700 TEU	2021	186 m	MAN - 6G60ME-C9	9.5	D

Page 27 of 45 — 2,221 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.