Gas Carrier Emissions & Retrofit Radar
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.
CII band distribution
84 at D/E425 rated vessels · 27 of the D/E set dock within 12 months
Docking pipeline — D/E vessels per quarter
Windows estimated from the class-expiry docking model, not bookings.
Top eligible retrofit measures for this segment
| Measure | Eligible | CO₂ reduction | Capex band | Payback | Confidence |
|---|---|---|---|---|---|
| Propeller redesign / replacement | 396 | 5–10% | €400k–1,200k | — | vendor claim |
| Turbocharger cut-out | 207 | 1–3% | €80k–250k | — | vendor claim |
| Shaft generator / PTO | 54 | 3–6% | €500–1,500/kW | — | vendor claim |
Capex bands are indicative vendor/literature priors. Payback appears once price parameters are configured.
Retrofit opportunity in this segment
Retrofit prospects — worst band first
| Vessel | Band | Age | Drop year |
|---|---|---|---|
| GAS VITALITY · <25k | E | 5y | 2026 |
| CONSTELLATION · 25-60k | E | 12y | 2026 |
| PERTAMINAGASAMARYLIS · 25-60k | E | 5y | 2026 |
| CHEIKH BOUAMAMA · 25-60k | E | 18y | 2026 |
| EIGER EXPLORER · 25-60k | E | 7y | 2026 |
| # | Vessel | Size (DWT) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 151 |
NAVIGATOR LEO
IMO 9482574
|
22,844 | 2011 |
10.5
|
C |
| 152 |
LALLA FATMA N'SOUMER
IMO 9275347
|
80,920 | 2004 |
10.5
|
C |
| 153 |
ENRICO FERMI
IMO 9789312
|
28,532 | 2018 |
10.5
|
C |
| 154 |
BERTOLLE
IMO 9177545
|
23,495 | 2000 |
10.6
|
C |
| 155 |
ARRHENIUS
IMO 9471032
|
26,645 | 2010 |
10.8
|
C |
| 156 |
CHESHIRE
IMO 9369772
|
26,471 | 2008 |
10.8
|
C |
| 157 |
GAS VENUS
IMO 9774197
|
28,702 | 2017 |
10.8
|
C |
| 158 |
SYLVIE
IMO 9332066
|
26,348 | 2007 |
10.9
|
C |
| 159 |
GASCHEM DOLLART
IMO 9744776
|
23,663 | 2020 |
10.9
|
C |
| 160 |
TRAMMO CORNELL
IMO 9543081
|
28,202 | 2017 |
10.9
|
C |
| 161 |
INEOS INNOVATION
IMO 9744958
|
20,917 | 2016 |
11.2
|
C |
| 162 |
ALKAID
IMO 9655509
|
22,780 | 2013 |
11.2
|
C |
| 163 |
ANTWERPEN
IMO 9318321
|
26,361 | 2005 |
11.3
|
C |
| 164 |
NAVIGATOR AURORA
IMO 9726322
|
27,037 | 2016 |
11.3
|
C |
| 165 |
INEOS INVENTION
IMO 9771511
|
20,738 | 2017 |
11.4
|
C |
| 166 |
PASCO ODIN
IMO 9292101
|
29,216 | 2005 |
11.4
|
C |
| 167 |
NAVIGATOR SOLAR
IMO 9712565
|
18,552 | 2018 |
11.5
|
C |
| 168 |
OCEANIC STAR
IMO 9447794
|
26,416 | 2009 |
11.5
|
C |
| 169 |
NAVIGATOR CAPRICORN
IMO 9403774
|
23,328 | 2008 |
11.6
|
C |
| 170 |
MANTA DICLE
IMO 9666675
|
28,210 | 2013 |
11.9
|
C |
| 171 |
ALCOR
IMO 9655511
|
22,765 | 2013 |
12.0
|
C |
| 172 |
DESERT ORCHID
IMO 9798167
|
16,596 | 2018 |
12.1
|
C |
| 173 |
NAVIGATOR VENUS
IMO 9177557
|
23,503 | 2000 |
12.1
|
C |
| 174 |
RHOURD EL HAMRA
IMO 9337793
|
19,277 | 2008 |
12.2
|
C |
| 175 |
CLIPPER EIRENE
IMO 9834715
|
18,063 | 2019 |
12.2
|
C |
| 176 |
DANCING BRAVE
IMO 9798179
|
16,600 | 2018 |
12.2
|
C |
| 177 |
INEOS INTREPID
IMO 9685449
|
20,917 | 2015 |
12.2
|
C |
| 178 |
NAVIGATOR GUSTO
IMO 9531507
|
16,687 | 2008 |
12.2
|
C |
| 179 |
INEOS INGENUITY
IMO 9685437
|
20,897 | 2015 |
12.2
|
C |
| 180 |
ENABLE
IMO 9900851
|
16,930 | 2023 |
12.2
|
C |
| 181 |
NAVIGATOR GALAXY
IMO 9536363
|
16,686 | 2011 |
12.4
|
C |
| 182 |
INEOS INSIGHT
IMO 9685425
|
20,918 | 2015 |
12.4
|
C |
| 183 |
INEOS INSPIRATION
IMO 9685451
|
20,916 | 2016 |
12.4
|
C |
| 184 |
INEOS INDEPENDENCE
IMO 9744960
|
20,918 | 2017 |
12.5
|
C |
| 185 |
INEOS INTUITION
IMO 9771523
|
20,716 | 2017 |
12.7
|
C |
| 186 |
THERESA SCHULTE
IMO 9553622
|
14,999 | 2014 |
12.7
|
C |
| 187 |
CLIPPER EOS
IMO 9827205
|
18,056 | 2019 |
12.8
|
C |
| 188 |
YARA SELA
IMO 9734850
|
18,547 | 2016 |
12.8
|
C |
| 189 |
EMPERY
IMO 9744910
|
16,925 | 2016 |
12.9
|
C |
| 190 |
YARA KARA
IMO 9734836
|
18,208 | 2016 |
13.1
|
D |
| 191 |
THEKLA SCHULTE
IMO 9551777
|
14,999 | 2014 |
13.1
|
D |
| 192 |
CLIPPER ENYO
IMO 9827217
|
18,077 | 2019 |
13.2
|
D |
| 193 |
ZITA SCHULTE
IMO 9694385
|
14,999 | 2017 |
13.2
|
D |
| 194 |
YARA NAUMA
IMO 9734848
|
18,208 | 2016 |
13.2
|
D |
| 195 |
CLIPPER ERIS
IMO 9834727
|
18,044 | 2019 |
13.2
|
D |
| 196 |
DILOS
IMO 9711535
|
14,999 | 2016 |
13.2
|
D |
| 197 |
KITHNOS
IMO 9711523
|
14,999 | 2016 |
13.2
|
D |
| 198 |
BERGA II
IMO 9537032
|
26,375 | 2010 |
13.3
|
D |
| 199 |
NAVIGATOR GENESIS
IMO 9531519
|
16,686 | 2011 |
13.6
|
D |
| 200 |
ELECTRA
IMO 9897107
|
16,893 | 2022 |
13.7
|
D |
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.
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.