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 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.

Segment rank (2025)

#1 of 1,422 chemical tankers

CO₂ intensity

3.5 g CO₂/dwt·nm

vs segment average (9.4)

-63% 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

1,451

vessels ranked

3.48

greenest (g CO₂/t·nm)

8.28

segment median

#	Vessel	Size (DWT)	Built	Length	Main Engine	Carbon intensity — AER (g CO₂/dwt·nm)	Grade
1	SEA WOLF I IMO 9540807	49,936	2011	182 m	Mitsui - MITSUI-MAN B&W 6S50MC-C	3.5	A
2	DELOS C IMO 1058341	49,996	2025	183 m	MAN-B&W 6G50ME-C9	3.7	A
3	MANDALA IMO 9299135	65,125	2006	183 m	MAN - 6S46MC-C	3.8	A
4	MH IBUKI IMO 9994711	49,948	2025	183 m	MAN-B&W 6G50ME-C9	3.9	A
5	LAGERI IMO 1021934	49,996	2026	183 m	MAN-B&W 6G50ME-C9	3.9	A
6	HAFNIA GUANGZHOU IMO 9856622	74,999	2019	228 m	CSSC - 6G60ME-C9	3.9	A
7	SILVER MOON IMO 1018872	49,986	2025	183 m	MAN-B&W 6G50ME-C9	4.0	A
8	VICTORIA BAY IMO 9974981	50,000	2024	175 m	6G50ME-C9-HPSCR	4.0	A
9	BANTRY BAY IMO 9967249	49,999	2023	183 m	MAN-B&W 6G50ME-C9	4.1	A
10	MOSSEL BAY IMO 9970375	49,999	2024	183 m	6G50ME-C9-HPSCR	4.1	A
12	ELAIA IMO 9798363	49,996	2019	183 m	Hyundai - 6G50ME-C9	4.1	A
13	KALK BAY IMO 9970363	49,999	2022	183 m	6G50ME-C9-HPSCR	4.1	A
11	MUSTANG IMO 9995442	50,539	2025	183 m	MAN-B&W 6G50ME-C9	4.1	A
14	JAL PRERANA IMO 1013987	50,640	2025	183 m	MAN-B&W 6G50ME-C9	4.1	A
15	ISLA DE BIOKO IMO 9767235	51,609	2016	186 m	Mitsui - 7S50ME-B9	4.2	A
16	TORM INTEGRITY IMO 9602710	73,811	2010	229 m	MAN - 5S60MC-C8	4.2	A
17	DEE4 NERIUM IMO 9929821	49,990	2022	183 m	MAN - 6S50ME-C9	4.2	A
18	ATLANTIC SUNSHINE IMO 9993810	50,000	2024	183 m	MAN-B&W 6G50ME-C9	4.2	A
19	TORM DORIS IMO 9683398	49,680	2015	183 m	MAN - 6G50ME-B9	4.2	A
22	TORM DAGMAR IMO 9702209	49,999	2015	183 m	Hyundai - 6G50ME-B9	4.2	A
21	TORM DURGA IMO 9682382	49,680	2014	183 m	Hyundai - 6G50ME-B9	4.2	A
20	TORM SUBLIME IMO 9854789	49,974	2019	183 m	Hudong Heavy Machinery - 6G50ME-C9.5 Tier II	4.2	A
23	TORM DAPHNE IMO 9692313	49,746	2015	183 m	MAN - 6G50ME-B9	4.2	A
24	DEE4 KASTANIA IMO 9933638	49,999	2020	183 m	6G50ME-C9-HPSCR	4.2	A
25	ARDMORE PURSUIT IMO 9732931	50,000	2017	183 m	STX - 6G50ME-B9	4.2	A
26	STI GALLANTRY IMO 9712876	109,999	2016	250 m	MAN - 6S60ME-C8	4.2	A
27	MUGELLO IMO 1030040	74,976	2025	228 m	MAN-B&W 5G60ME-C10	4.2	A
28	TORM DIANA IMO 9702223	49,999	2013	183 m	Hyundai - 6G50ME-B9	4.3	A
29	MH NORIKURA IMO 9994694	49,999	2025	183 m	MAN-B&W 6G50ME-C9	4.3	A
30	PS IMABARI IMO 9908504	52,838	2022	185 m	6S50ME-C9.6	4.3	A
32	STENA PRO MARINE IMO 9899739	49,990	2022	186 m	6G50ME-LGIM	4.3	A
31	DEE4 JUNIPER IMO 9930923	49,999	2020	183 m	Hyundai Heavy Industries Co. Ltd. 6G50ME-C9.6	4.3	A
33	TORM SOVEREIGN IMO 9797723	49,999	2015	183 m	Hyundai - 6G50ME-B9	4.3	A
34	PHILOXENIA IMO 9857250	49,999	2019	183 m	Hyundai - 6G50ME-C9	4.3	A
35	DEE4 ILEX IMO 9922093	49,999	2020	183 m	Hyundai Heavy Industries Co. Ltd. 6G50ME-C9-HPSCR	4.3	A
37	AMIRA IMO 9917842	55,202	2022	183 m	6G50ME-C9-HPSCR	4.3	A
36	TORM DAMINI IMO 9682370	49,746	2012	183 m	HHI - 6G50ME-B9.3	4.3	A
38	PALAWAN STAR IMO 9401233	73,796	2008	229 m	Hudong Heavy Machinery - 5S60MC-C	4.4	A
39	SEYMOUR SUN IMO 9911501	49,999	2022	186 m	Hyundai - 6G50ME-C9-LGIM	4.4	A
40	TORM BIRGITTE IMO 9664720	49,995	2012	183 m	STX - 6S50ME-C	4.4	A
41	SEAMERIT IMO 1014034	50,498	2025	183 m	MAN-B&W 6G50ME-C9	4.4	A
42	STENA PROSPEROUS IMO 9923750	49,990	2022	186 m	6G500ME-C9-LGIM	4.4	A
45	AGISILAOS IMO 9953418	50,113	2023	183 m	6G50ME-C9-HPSCR	4.4	A
44	TORM DULCE IMO 9682394	49,746	2014	183 m	HHI - 6G50ME-B9.3	4.4	A
43	IONIAN STAR IMO 9828895	50,506	2019	183 m	MAN - 6G50ME-C9	4.4	A
46	AGIOS NIKOLAOS IMO 9820283	49,988	2018	183 m	Hyundai - 6X52	4.4	A
47	TORM DEBORAH IMO 9683386	49,680	2015	183 m	Hyundai - 6G50ME-B9	4.4	A
48	AGIOI FANENDES IMO 9798375	49,996	2019	183 m	Hyundai - 6G50ME-C9	4.5	A
50	MINDORO STAR IMO 9441207	73,677	2009	229 m	Hudong Heavy Machinery - 5S60MC-C	4.5	A
49	EUROSAILOR IMO 9895915	49,999	2021	183 m	Hyundai - 6G50ME-C9	4.5	A

Page 1 of 29 — 1,422 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 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.