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)

#3 of 1,350 chemical tankers

CO₂ intensity

3.8 g CO₂/dwt·nm

vs segment average (9.91)

-62% 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

1,378

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
1	ELANDRA WILLOW IMO 9834349	49,999	2019	183 m	Hyundai - 6G50ME-C9	3.6	A
2	STENA PRO MARINE IMO 9899739	49,990	2022	186 m	6G50ME-LGIM	3.8	A
3	HAFNIA BEIJING IMO 9856634	74,999	2019	228 m	CSSC - 6G60ME-C9	3.8	A
4	STI GALLANTRY IMO 9712876	109,999	2016	250 m	MAN - 6S60ME-C8	4.0	A
5	STENA PROVIDENT IMO 9944637	49,990	2023	186 m	6G50ME-C9-LGIM	4.1	A
6	CAPE TEMPEST IMO 9407263	73,720	2008	229 m	MAN - 5S60MC-C	4.2	A
7	STENA PROGRESSIVE IMO 9944649	49,990	2024	186 m	6G50ME-C9-LGIM	4.2	A
8	STENA PROMISE IMO 9923748	49,990	2022	186 m	6G50ME-C9-LGIM	4.2	A
9	DORIC PIONEER IMO 9637117	51,565	2013	183 m	Hyundai - 7S50MC-C8	4.2	A
10	CLEAROCEAN MARAUDER IMO 9890446	49,999	2021	183 m	Doosan - 6G50ME-C9	4.2	A
11	NORD JOY IMO 9814179	49,874	2018	182 m	MAN - 6S50ME-B	4.2	A
12	STENA PROSPEROUS IMO 9923750	49,990	2022	186 m	6G500ME-C9-LGIM	4.2	A
13	CLEAROCEAN MELODY IMO 9849265	49,995	2019	183 m	STX - 6G50ME-B9	4.2	A
14	AVAX IMO 9953420	50,113	2021	183 m	6G50ME-C9-HPSCR	4.3	A
15	VICTORIA BAY IMO 9974981	50,000	2024	175 m	6G50ME-C9-HPSCR	4.3	A
16	ISABELLA M II IMO 9836440	49,999	2019	183 m	Hyundai - 6G50ME-C9	4.3	A
17	CYPRESS SUN IMO 9911551	49,999	2023	186 m	6G50ME-C9-LGIM	4.3	A
18	AGIOS NIKOLAOS IMO 9820283	49,988	2018	183 m	Hyundai - 6X52	4.3	A
19	MOSSEL BAY IMO 9970375	49,999	2024	183 m	6G50ME-C9-HPSCR	4.3	A
21	AGIOI FANENDES IMO 9798375	49,996	2019	183 m	Hyundai - 6G50ME-C9	4.3	A
20	KK MARLIN IMO 9835939	77,452	2021	228 m	Mitsui - 6G60ME-C9	4.3	A
22	AHINOS IMO 9328144	53,187	2007	183 m	Wärtsilä - 7RT-flex50	4.4	A
23	ISLA DE BIOKO IMO 9767235	51,609	2016	186 m	Mitsui - 7S50ME-B9	4.4	A
24	NORD OLYMPIA IMO 9747132	49,995	2018	183 m	Mitsui - 6S50ME-B9.5	4.4	A
25	DAT VENUS IMO 9948293	49,801	2023	183 m	MAN - 6G50ME-C9	4.4	A
26	CAPILANO SUN IMO 9909584	49,999	2021	186 m	6G50ME-C9-LGIM	4.4	A
27	CS HU BEI IMO 9899480	47,495	2022	183 m	MAN - 6G50ME-C9	4.5	A
28	SILVER MANOORA IMO 9718844	49,897	2016	183 m	MAN - 6G50ME-B9	4.5	A
29	HAFNIA PIONEER IMO 9595632	74,999	2013	228 m	Hyundai - 5S60MC-CMkVIII	4.5	A
30	ELDIA IMO 9798351	49,996	2019	183 m	Hyundai - 6G50ME-C9	4.6	A
31	HEROLDS BAY IMO 9967251	49,999	2023	183 m	MAN-B&W 6G50ME-C9	4.6	A
32	EMMA GRACE IMO 9694191	49,997	2015	183 m	MAN - 6G50ME-B9	4.6	A
33	PS NEW ORLEANS IMO 9919577	52,853	2022	185 m	6S50ME-C9.6	4.6	A
34	SOLAR KAREN IMO 9907823	49,365	2021	183 m	6G50ME-C9-HPSCR	4.6	A
35	DEE4 KASTANIA IMO 9933638	49,999	2020	183 m	6G50ME-C9-HPSCR	4.6	A
37	TP ENDEAVOUR IMO 9835056	49,999	2020	183 m	Hyundai - 6G50ME-C9 (Tier II)	4.6	A
36	MRC NAZENDE IMO 9419735	51,291	2009	183 m	STX - 6 S 50 MC-C	4.6	A
38	DEE4 NERIUM IMO 9929821	49,990	2022	183 m	MAN - 6S50ME-C9	4.7	A
39	CELSIUS PORTSMOUTH IMO 9884837	50,299	2021	183 m	MAN - 6G50ME-C9	4.7	A
40	LINDANGER IMO 9725299	49,999	2016	186 m	Hyundai - 6G50ME-B9.3-LGI (Tier-II)	4.7	A
41	STI MYSTERY IMO 9829461	49,999	2019	183 m	Hyundai - 6G50ME-C9	4.7	A
42	DEE4 ILEX IMO 9922093	49,999	2020	183 m	Hyundai Heavy Industries Co. Ltd. 6G50ME-C9-HPSCR	4.7	A
43	ELAIA IMO 9798363	49,996	2019	183 m	Hyundai - 6G50ME-C9	4.7	A
45	MINDORO STAR IMO 9441207	73,677	2009	229 m	Hudong Heavy Machinery - 5S60MC-C	4.8	A
44	PACIFIC DEBBIE IMO 9772058	73,500	2015	219 m	STX - 6S60ME-C8	4.8	A
46	ELANDRA STAR IMO 9635767	49,999	2013	183 m	Doosan - 6S50MC-C8	4.8	A
49	PS ATENE IMO 9831206	49,999	2018	183 m	Hyundai - 6G50ME-C9	4.8	A
48	ST NICHOLAS IMO 9934149	50,226	2022	183 m	MAN - 6G50ME-C9	4.8	A
47	GREEN SKY IMO 9676515	50,879	2014	183 m	MAN - 6S50ME-B9.2	4.8	A
50	SILVER CINDY IMO 9682368	49,738	2014	183 m	Hyundai - 6G50ME-B9	4.8	A

Page 1 of 27 — 1,350 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 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.