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)

#200 of 1,422 chemical tankers

CO₂ intensity

5.4 g CO₂/dwt·nm

vs segment average (9.4)

-43% 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
151	STENA PRO PATRIA IMO 9899727	49,990	2022	186 m	Dalian Marine Diesel Works 6G50ME-C9-LGIM	5.2	A
152	ST GEORGE IMO 9412775	50,651	2010	183 m	MAN - 6S50MC-C	5.2	A
155	HAFNIA KIRSTEN IMO 9732682	49,999	2017	183 m	Hudong Heavy Machinery - 6S50ME-B9.2 (Tier II)	5.2	A
154	SILVER EMILY IMO 9682356	49,746	2014	183 m	HHI - 6G50ME-B9.3	5.2	A
153	ECOMAR GASCOGNE IMO 1029261	49,776	2025	183 m	MAN-B&W 6G50ME-C9-LGIM	5.2	A
157	JUPITER STAR IMO 9919632	50,434	2021	183 m	Hyundai Heavy Industries Co. Ltd. 6G50ME-C9.6-HPSCR	5.2	A
156	CYPRESS SUN IMO 9911551	49,999	2023	186 m	6G50ME-C9-LGIM	5.2	A
158	OINOUSSIAN STAR IMO 9827578	49,999	2018	183 m	MAN - 6G50ME-C9	5.2	A
159	HAFNIA VIRIDIAN IMO 9690614	49,126	2015	183 m	Hyundai - 6G50ME-B9	5.2	A
160	NORD MARINER IMO 9941300	49,999	2023	183 m	Hyundai - 6G50ME-C9	5.2	A
162	STENA CONQUEST IMO 1013963	49,948	2025	183 m	MAN-B&W 6G50ME-C9	5.2	A
161	LONE STAR MARINER IMO 9902859	50,275	2021	183 m	MAN - 6G50ME-C9	5.2	A
163	BLUE BUTTERFLY IMO 9788576	49,995	2019	182 m	MAN - 6S50ME-B9	5.2	A
164	TORM TROILUS IMO 9726475	49,757	2016	183 m	MAN - 6G50ME-B9	5.2	A
165	AVENCA IMO 9410002	51,237	2008	183 m	STX - 6S50MC-C-MKVII	5.2	A
168	STENA IMPORTANT IMO 9667497	49,731	2015	183 m	MAN - 6S50ME-B9.3	5.2	A
167	STI MIGHTY IMO 9854739	47,499	2020	183 m	Hyundai - 6G50ME-C 9.5	5.2	A
166	SOLAR CHERYL IMO 9898503	49,389	2021	183 m	MAN - 6G50ME-C9	5.2	A
170	SOLAR RUO YUN IMO 9907811	49,362	2021	183 m	6G50ME-C9-HPSCR	5.2	A
169	NORD VANQUISH IMO 9833058	50,338	2017	183 m	Hyundai - 6G50ME-C9 (Tier II)	5.2	A
172	NORD VIRAGE IMO 9944132	50,378	2022	183 m	Hyundai Heavy Industries Co. Ltd. 6G50ME-C9.6-HPSCR	5.2	A
171	NAVIG8 GRACE IMO 9833656	49,804	2019	183 m	MAN - 6G50ME-C9	5.2	A
173	LUCKY CHEMIST IMO 9686742	49,990	2015	183 m	MAN - 6S50MC-C8	5.3	A
175	SEAWAYS WARWICK IMO 9717761	49,990	2015	183 m	Hyundai - 6S50MC-C8	5.3	A
174	CLEAROCEAN MAGIC IMO 9849382	49,995	2019	183 m	STX - 6G50ME-C9	5.3	A
178	MADHA SILVER IMO 9718818	45,923	2016	183 m	Hyundai - 6G50ME-B9	5.3	A
177	DANK SILVER IMO 9718806	49,734	2016	183 m	Hyundai - 6G50ME-B9	5.3	A
176	HIGH NAVIGATOR IMO 9814143	49,921	2018	182 m	Mitsui - 6S50ME-B9	5.3	A
179	CAPE AVANTI IMO 9995430	50,516	2025	183 m	MAN-B&W 6G50ME-C9	5.3	A
181	ZAHRA IMO 9917866	55,202	2022	183 m	MAN - 6G50ME-C9	5.3	A
180	CATHERINE GRACE IMO 9724611	50,099	2016	183 m	Doosan - 6RT-flex50	5.3	A
182	BOW TRIDENT IMO 9669897	49,622	2014	183 m	MAN - 6S50ME-B9	5.3	A
183	MAHADAH SILVER IMO 9718777	45,923	2016	183 m	MAN - 6G50ME-B9	5.3	A
185	STI MODEST IMO 9833577	49,999	2019	183 m	Hyundai - 6G50ME-C9	5.3	A
184	SOLAR SUSIE IMO 9898515	49,360	2021	183 m	6G50ME-C9-HPSCR	5.3	A
190	ECO YOSEMITE PARK IMO 9877573	49,999	2020	183 m	Hyundai - 6G50ME-C9	5.3	A
189	TORM AMALIE IMO 9466025	49,999	2011	183 m	Wärtsilä - 7RT-flex50	5.3	A
188	STI MILLENNIA IMO 9829497	47,499	2019	183 m	Hyundai - 6G50ME-C9	5.3	A
187	YASA SWAN IMO 9857248	50,215	2019	183 m	Hyundai - 6G50ME-C9	5.3	A
186	NORD MAVERICK IMO 9877559	50,185	2020	183 m	Hyundai - 6G50ME-C9.5-HPSCR	5.3	A
191	TORM LENE IMO 9390769	53,143	2008	183 m	Wärtsilä - 7RT-flex50	5.3	A
192	TORM DAVAO IMO 9688350	49,990	2014	183 m	HHI - 6G50ME-B9.3	5.3	A
193	NORD MATE IMO 1013949	49,999	2025	183 m	MAN-B&W 6G50ME-C9	5.3	A
196	NAVIG8 EXPRESS IMO 9976874	49,153	2024	183 m	6G50ME-C9-HPSCR	5.3	A
195	NAVIG8 GALLANTRY IMO 9833668	49,759	2019	183 m	Hyundai - 6G50ME-C9	5.3	A
194	FPMC 36 IMO 9845180	49,721	2020	183 m	MAN - 6G50ME-C9 (Tier III)	5.3	A
199	ECOMAR GUYENNE IMO 1029273	49,763	2025	183 m	MAN-B&W 6G50ME-C9-LGIM	5.4	A
198	AL AMERAT IMO 9405851	51,022	2008	183 m	MAN - 6S50MC-C	5.4	A
197	HIGH TRUST IMO 9696254	49,990	2016	183 m	MAN - 6G50ME-B9	5.4	A
200	SILVER ORLA IMO 9682332	49,746	2014	183 m	HHI - 6G50ME-B9.3	5.4	A

Page 4 of 29 — 1,422 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.