Most Emission-Efficient Bulk Carriers

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)

#2,047 of 3,531 bulk carriers

CO₂ intensity

4.9 g CO₂/dwt·nm

vs segment average (4.87)

+1% 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

3,604

vessels ranked

1.42

greenest (g CO₂/t·nm)

4.65

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
2001	AFRICAN MACAW IMO 9767431	37,800	2016	180 m	MAN - 6S46ME-B8	4.9	C
2002	ROSTRUM OPTIMA IMO 9941635	40,030	2024	180 m	MAN - 5S50ME-C9	4.9	C
2003	CLIPPER KYTHIRA IMO 9663116	63,273	2015	200 m	MAN - 5S60ME-C8	4.9	C
2004	NEW MOMENTUM IMO 9804954	39,042	2018	180 m	Mitsui - 5S50ME-B9	4.9	C
2005	TOMINI OROSHI IMO 9714795	38,706	2016	180 m	Wärtsilä - 6RTA48TD-1 (Tier II)	4.9	C
2006	TAC IMOLA IMO 9932103	40,256	2021	180 m	MAN - 5S50ME-C9	4.9	C
2007	THOR INFINITY IMO 9238466	52,383	2002	190 m	Mitsui - 6S50MC	4.9	C
2008	TOMINI SOLANO IMO 9711731	38,835	2016	190 m	Wärtsilä - 6RTA48TD-1 Tier II compliant	4.9	C
2009	GLOBAL UNITY IMO 9665542	63,238	2013	200 m	MAN - 6S60MC-C8	4.9	C
2010	MONING IMO 9832688	37,731	2018	180 m	MAKITA - 6S46MC-C	4.9	C
2011	GIYAS IMO 9208526	72,917	2000	225 m	Hyundai - 6S60MC	4.9	C
2012	WOOYANG ELITE IMO 9731391	43,368	2017	190 m	Yichang - 5S50ME-B9	4.9	C
2013	SILVER PEGASUS IMO 9343455	54,267	2007	210 m	Mitsubishi - 7UEC50LSII	4.9	C
2014	MERCURY OCEAN IMO 9480942	53,452	2008	190 m	Mitsui - 6S50MC-C	4.9	C
2015	AETOLIA IMO 9425813	58,106	2010	190 m	Mitsui - 6S50MC-C	4.9	C
2016	AC OREN IMO 9491214	56,877	2010	190 m	Doosan - 6S50MC-C	4.9	C
2017	TRANSTIME IMO 9595929	56,726	2012	190 m	MAN - 6S50MC-C	4.9	C
2018	ZOITSA SIGALA IMO 9700861	63,500	2014	200 m	Hudong Heavy Machinery - 5S60ME-C8 Tier II	4.9	C
2019	ABTENAUER IMO 9655212	36,056	2014	180 m	Wärtsilä - 5RT-flex50	4.9	C
2020	LOWLANDS ENGEL IMO 9959462	40,055	2023	183 m	Mitsui - 5S50ME-C9	4.9	C
2021	BELSOUTH IMO 9744063	63,297	2015	200 m	MAN - 5S60ME-C8	4.9	C
2022	SSI CONQUEST IMO 9637416	57,599	2013	190 m	STX - 6 S 50 MC-C	4.9	C
2023	NY SUNRISE IMO 9934814	40,281	2023	180 m	MAN - 5S50ME-C9	4.9	C
2024	YANGTZE ALPHA IMO 9632791	56,692	2012	190 m	Wärtsilä - 6RT-flex50-B	4.9	C
2025	ODYSSEUS N IMO 9490442	79,642	2011	229 m	Hyundai - 7S50MC-C	4.9	C
2026	AFRICAN LARK IMO 9682760	34,402	2014	180 m	Mitsubishi - 6UEC45LSE	4.9	C
2027	QUEEN IMO 9425928	58,096	2010	190 m	MAN - 6S50MC-C	4.9	C
2028	FLAG FILIA IMO 9643910	56,520	2014	190 m	STX - 6S50MC-C8	4.9	C
2029	FEDERAL MAYUMI IMO 9529578	35,885	2012	199 m	MAN - 6S46MC-C	4.9	C
2030	WHIPLASH IMO 9629249	53,224	2012	190 m	MAN - 6S50MC-C	4.9	C
2031	LETO IMO 9696424	63,800	2015	200 m	MAN - 5S60ME-C8	4.9	C
2032	MELINDA IMO 9623881	58,000	2012	190 m	Doosan - 6S50MC-C	4.9	C
2033	DAIWAN MIRACLE IMO 9796547	34,447	2019	180 m	Mitsubishi - 6S46ME-B8	4.9	C
2034	ND ARMONIA IMO 9514262	56,121	2011	190 m	MAN - 6S50MC-C	4.9	C
2035	MAGDA P IMO 9476692	57,015	2010	190 m	Doosan - 6S50MC-MKVII	4.9	C
2036	RABEA IMO 9725524	39,998	2018	180 m	Doosan - 5RT-flex50	4.9	C
2037	CS JOLA IMO 9791896	37,713	2017	180 m	MAKITA - 6S46ME-B8	4.9	C
2038	FEHU IMO 9611826	57,000	2012	190 m	Doosan - 8S50MC-C	4.9	C
2039	SPAR MIRA IMO 9490727	58,000	2010	190 m	MAN - 6S50MC-C	4.9	C
2040	TURTLE ISLAND IMO 9832652	63,562	2018	200 m	Hitachi - 6S50ME-B9	4.9	C
2041	LILA CUMBERLAND IMO 9666649	56,531	2013	190 m	Doosan - 6S50MC-C	4.9	C
2042	DENSA LION IMO 9432464	55,089	2010	190 m	Hudong Heavy Machinery - 6S50MC-CMKVII	4.9	C
2043	EMMANUEL C IMO 9394909	58,837	2008	190 m	Mitsui - 6S50MC-C	4.9	C
2044	ALAMO IMO 9851335	39,258	2019	183 m	Mitsui - 6S46ME-B8	4.9	C
2045	MEGHNA STAR IMO 9717060	58,045	2014	190 m	MAN - 6S50ME-B9	4.9	C
2046	ERHAN IMO 9625449	38,694	2013	180 m	Doosan - DOOSAN-MAN 6S46MC-C	4.9	C
2047	CAPE SPENCER IMO 9968982	40,177	2023	183 m	J-ENG 6UEC42LSH-EcoD3	5.0	C
2048	LILA FROSTBURG IMO 9672507	56,425	2013	190 m	MAN - 6S50MC-C	5.0	C
2049	INDIAN BULKER IMO 9791925	37,717	2017	180 m	MAKITA - 6S50ME-C	5.0	C
2050	VELVET IMO 9782651	37,324	2021	180 m	MAN - 6S50ME-B9.3	5.0	C

Page 41 of 71 — 3,531 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 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.