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)

#266 of 2,221 container ships

CO₂ intensity

4.5 g CO₂/dwt·nm

vs segment average (9.9)

-54% 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
245	MSC DARLENE IMO 9930959	15,500 TEU	2023	366 m	MAN - 9G95ME-C10	4.5	A
249	SANTA CATARINA EXPRESS IMO 9793911	11,800 TEU	2018	330 m	Doosan - 8X92	4.5	A
255	OOCL UNITED KINGDOM IMO 9776200	21,100 TEU	2015	400 m	Doosan - 11G95ME-C9	4.5	A
254	MUNICH MAERSK IMO 9778806	20,568 TEU	2017	399 m	Doosan - 7G80ME-C9	4.5	A
253	YM WARMTH IMO 9704647	14,080 TEU	2015	368 m	MAN - 11S90ME-C9	4.5	A
258	SAN NICOLAS MAERSK IMO 9622203	9,669 TEU	2013	333 m	HHI - 7S90-C9.2	4.5	A
257	ONE REINFORCEMENT IMO 9952725	7,000 TEU	2024	272 m	Hanwha Engine Co Ltd - South Korea 7G80ME-C10-HPSCR	4.5	A
256	ONE EAGLE IMO 9741396	14,026 TEU	2016	364 m	Diesel United - 9X82	4.5	A
259	SEASPAN BRILLIANCE IMO 9685334	10,100 TEU	2014	337 m	MAN - 10S90ME-C9	4.5	A
262	MSC MICOL IMO 9931290	24,000 TEU	2023	400 m	HD Hyundai Heavy Industries Co Ltd - South Korea 11X92	4.5	A
261	MARSTAL MAERSK IMO 9619971	18,270 TEU	2014	399 m	Doosan - 8S80ME-C MK9.2	4.5	A
260	HMM GARAM IMO 9869186	14,000 TEU	2021	366 m	MAN - 9G95ME-C10	4.5	A
265	MILAN MAERSK IMO 9778820	20,568 TEU	2017	399 m	Doosan - 7G80ME-C9	4.5	A
264	MAERSK HANOI IMO 9784295	15,282 TEU	2018	353 m	Hyundai - 8G95ME-C9	4.5	A
263	MADISON MAERSK IMO 9619945	18,270 TEU	2014	399 m	Doosan - 8S80ME-C MK9.2	4.5	A
266	COSCO SHIPPING GEMINI IMO 9783526	17,273 TEU	2018	400 m	CSSC - 11S90ME-C10	4.5	A
268	MAERSK HERRERA IMO 9784324	15,282 TEU	2018	353 m	Hyundai - 8G95ME-C9	4.5	A
267	MSC GHANA IMO 9974503	8,300 TEU	2025	260 m	Hyundai Heavy Industries Co. Ltd. 7G80ME-C10-coEGR	4.5	A
270	MSC ALLEGRA IMO 9897028	23,656 TEU	2021	400 m	Doosan - 11G95ME-C9	4.6	A
269	HYUNDAI PLUTO IMO 9725160	10,000 TEU	2016	324 m	Hyundai - 9G80ME-C9	4.6	A
273	MSC LENI IMO 9839454	22,000 TEU	2019	400 m	MAN - 11G95ME	4.6	A
276	MAERSK EMDEN IMO 9456769	13,100 TEU	2010	366 m	Hyundai - WART.12RT-FLEX96C-B	4.6	A
272	EVER ACT IMO 9893905	23,764 TEU	2021	400 m	Hyundai Heavy Industries Co Ltd - South Korea 11X92	4.6	A
275	MSC NIGERIA IMO 9974541	8,300 TEU	2025	260 m	Hyundai Heavy Industries Co. Ltd. 7G80ME-C10-coEGR	4.6	A
271	CMA CGM CEDRUS IMO 9938121	15,000 TEU	2024	366 m	Wärtsilä - 10X92DF	4.6	A
274	CMA CGM MEXICO IMO 9839911	15,128 TEU	2019	366 m	Hyundai - 11G90ME-C10	4.6	A
277	MSC GEMMA IMO 9936616	272,133	2023	400 m	UnKnown 11X92	4.6	A
279	MATZ MAERSK IMO 9619983	18,270 TEU	2011	399 m	Doosan - 8S80ME-C MK9.2 TIER II	4.6	A
278	CMA CGM GREENLAND IMO 9895006	15,000 TEU	2022	366 m	Wärtsilä - 10X92DF	4.6	A
280	BRISBANE MAERSK IMO 9984596	17,148 TEU	2025	351 m	8G95ME-C10-LGIM	4.6	A
283	COSCO SHIPPING LEO IMO 9783502	20,000 TEU	2018	400 m	CSSC - 11S90ME-C10	4.6	A
282	MSC MIRJAM IMO 9767376	16,909 TEU	2016	400 m	MAN - 11G95ME-C9	4.6	A
281	MSC TESSA IMO 9930038	24,100 TEU	2023	400 m	UnKnown 11X92	4.6	A
284	MSC VIRGINIA IMO 9908059	14,000 TEU	2022	335 m	CSSC-MES Diesel Co Ltd - China 9X92DF	4.6	A
285	MARY MAERSK IMO 9619921	18,270 TEU	2013	399 m	Doosan - 8S80ME-C MK9.2	4.6	A
286	ONE FOCUS IMO 9944792	15,000 TEU	2024	366 m	8G95ME-C10	4.6	A
288	MAERSK HOUSTON IMO 9848950	15,286 TEU	2019	353 m	Hyundai - 8G95ME-C9	4.6	A
287	MSC SAVONA IMO 9460356	14,000 TEU	2010	366 m	Doosan - 12K98MC-C	4.6	A
289	MSC ROUEN IMO 9975571	101,078	2025	272 m	MAN-B&W 6G80ME-C10-GI	4.6	A
291	BANGKOK MAERSK IMO 9984584	17,148 TEU	2025	351 m	8G95ME-C10-LGIM	4.6	A
290	MOGENS MAERSK IMO 9632090	18,270 TEU	2014	399 m	Doosan - 7S80ME-C	4.6	A
293	MSC WASHINGTON IMO 9908047	14,428 TEU	2022	335 m	CSSC-MES Diesel Co Ltd - China 9X92DF	4.6	A
295	SAN ANTONIO MAERSK IMO 9622241	9,669 TEU	2014	333 m	HHI - 7S90-C9.2	4.6	A
294	COSCO SHIPPING LOTUS IMO 9785811	13,500 TEU	2019	366 m	CSSC - 11S90ME-C10	4.6	A
292	MSC LYON IMO 9975569	101,078	2024	272 m	MAN-B&W 6G80ME-C10-GI	4.6	A
297	SEASPAN BRIGHTNESS IMO 9685346	10,100 TEU	2014	337 m	MAN - 10S90ME-C9	4.7	A
296	MAERSK CAMPBELL IMO 9924209	15,500 TEU	2022	366 m	MAN - 9G95ME-C10	4.7	A
298	CMA CGM IVANHOE IMO 9365805	9,661 TEU	2008	350 m	Wärtsilä - 12RTA96C	4.7	A
300	MUMBAI MAERSK IMO 9780471	20,568 TEU	2018	399 m	Doosan - 7G80ME-C9	4.7	A
299	COSCO SHIPPING LIBRA IMO 9783538	17,273 TEU	2018	400 m	CSSC - 11S90ME-C10	4.7	A

Page 6 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.