Most Emission-Efficient Chemical Tankers

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)

#1,079 of 1,350 chemical tankers

CO₂ intensity

13.5 g CO₂/dwt·nm

vs segment average (9.91)

+37% 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

1,378

vessels ranked

3.64

greenest (g CO₂/t·nm)

8.79

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
1051	NORTHERN SPIRIT IMO 9580962	19,118	2011	162 m	MAK/Caterpillar - 7M43C	12.8	D
1052	THERESA GALAXY IMO 9317195	19,988	2005	148 m	Mitsubishi - 7UEC45LA	12.8	D
1053	FT QUARTO IMO 9447330	18,000	2012	148 m	MAN - 8 S 35 MC	12.8	D
1054	SCOT BAYERN IMO 9255828	8,234	2003	117 m	MAN - 6L27/38	12.8	D
1055	CHEMICAL LUNA IMO 9521423	14,304	2008	134 m	Hitachi - 6S35MC	12.9	D
1056	HARBOUR EXPRESS IMO 9418822	20,528	2011	162 m	MAK/Caterpillar - 6M43	12.9	D
1057	CHEM TAURUS IMO 9477505	19,960	2010	146 m	MAN - 6S42MC	12.9	D
1058	ELM GALAXY IMO 9331256	20,854	2006	148 m	Mitsubishi - 7UEC45LA	12.9	D
1059	NQ MAGNOLIA IMO 9384162	17,101	2007	138 m	Wärtsilä - 6 L 46 C	12.9	D
1060	ATLANTIC SPIRIT IMO 9580974	19,131	2011	162 m	MAK/Caterpillar - 7M43	12.9	D
1061	ASP LILY IMO 9542178	19,991	2011	146 m	MAN - 6S42MC	13.0	D
1062	NQ MILLA IMO 9261516	16,882	2003	138 m	Wärtsilä - 6 L 46 C	13.1	D
1063	MAZU XIAO IMO 9503940	7,732	2008	118 m	MAK/Caterpillar - 9M25	13.1	D
1064	LOEVSTAKKEN IMO 9724441	19,995	2015	146 m	MAN - 6S42MC7	13.1	D
1065	ARKOS IMO 9286827	13,700	2004	135 m	Hudong Heavy Machinery - 6S42MC	13.1	D
1066	PVT ESTELLA IMO 9414321	13,102	2010	129 m	MAN - 6S35MC	13.3	D
1067	ATLANTIC MATE IMO 9350745	18,000	2007	148 m	MAK/Caterpillar - 7M43	13.3	D
1068	MISSISSIPPI STAR IMO 9527623	13,054	2010	129 m	STX - 6S35MC-MK7	13.3	D
1069	AWH ALMA IMO 9486166	17,055	2009	144 m	STX - 7S35MC	13.3	D
1070	GULHOLMEN IMO 9435703	16,817	2009	144 m	MAN - 8 S 35 MC	13.3	D
1071	LINKEN IMO 9733351	19,997	2016	145 m	MAKITA - 5S46ME-B8	13.3	D
1072	CHEMICAL FRONTIER IMO 9940734	14,521	2022	132 m	6S35ME-C9	13.4	D
1073	HARBOUR FASHION IMO 9473080	16,878	2011	144 m	MAK/Caterpillar - 7M43C	13.4	D
1074	CHEM HYDRA IMO 9486180	17,055	2009	145 m	STX - 7S35MC	13.4	D
1075	THE AMIGO IMO 9492309	14,911	2012	133 m	3. MAJ - 6RT-flex35	13.4	D
1076	AQUARIUS IMO 9393008	19,928	2008	141 m	Akasaka - 7UEC45LA	13.4	D
1077	TRANS FJORD IMO 9956939	12,576	2023	126 m	MAKITA - 6S35MC-C9	13.4	D
1078	FMT GUMULDUR IMO 9427976	14,368	2009	143 m	MAN - 6S35MC	13.5	D
1079	VESTHOLMEN IMO 9421295	17,525	2009	144 m	MAN - 8 S 35 MC	13.5	D
1080	MTM SOUTHPORT IMO 9416032	20,216	2008	147 m	MAN - 6S42MC-MKVI	13.6	D
1081	HARBOUR PIONEER IMO 9572757	19,122	2010	162 m	MAK/Caterpillar - 7M43C	13.6	E
1082	ERIKA SCHULTE IMO 9439864	16,427	2011	145 m	STX - 6S35MC-MK7	13.6	E
1083	HARBOUR PROGRESS IMO 9572745	19,175	2010	162 m	MAK/Caterpillar - 7M43C	13.6	E
1084	CHEMICAL MASTER IMO 9558957	14,298	2009	134 m	Hitachi - 6S35MC	13.6	E
1085	CHEM NORMA IMO 9486192	17,095	2009	145 m	STX - 7S35MC	13.6	E
1086	FRANK IMO 9371787	17,998	2008	148 m	MAK/Caterpillar - MAK 7 M 43 C	13.6	E
1087	SLOMAN HERMES IMO 9466738	16,418	2012	145 m	MAN - 6S35MC	13.7	E
1088	EVA BERGEN IMO 9800013	19,888	2018	146 m	Hitachi - 6S40ME-B9	13.7	E
1089	XT PROGRESS IMO 9500144	17,427	2020	144 m	MAN - 7 S 35 MC	13.7	E
1090	YM SATURN IMO 9362138	15,988	2007	148 m	MAK/Caterpillar - 6M43	13.7	E
1091	STOLT TEAL IMO 9199323	8,587	1999	112 m	Akasaka - 6UEC37LA	13.7	E
1092	EL ZORRO IMO 9344801	13,085	2007	129 m	STX - STX-MAN B&W 6S35MC-MK7	13.7	E
1093	ORIENTAL IXIA IMO 9924728	16,298	2023	142 m	MAN - 6S35MC-C9	13.8	E
1094	CUMBRIAN IMO 9298404	12,921	2004	127 m	STX - 6S35MC	13.8	E
1095	LUNNI IMO 9797802	17,500	2018	155 m	Hudong Heavy Machinery - 6G45ME-C9	13.8	E
1096	HEINRICH IMO 9350757	17,998	2008	148 m	MAK/Caterpillar - 7M43C	13.8	E
1097	GINGA SAKER IMO 9258155	20,491	2003	148 m	Sulzer - 6UEC52LA	13.8	E
1098	SILENDI IMO 9508720	19,964	2009	150 m	MAN - 8 S 35 MC	13.9	E
1099	CHEMICAL EXPLORER IMO 9820427	12,643	2018	127 m	Hitachi - 6S35ME-B9	13.9	E
1100	THEMSESTERN IMO 9183843	21,870	2000	162 m	MAN - 6S46MC-C	13.9	E

Page 22 of 27 — 1,350 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.