Container Ship 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 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.
CII band distribution
1,079 at D/E2,510 rated vessels · 443 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 |
|---|---|---|---|---|---|
| Turbocharger cut-out | 1,640 | 1–3% | €80k–250k | — | vendor claim |
| Propeller redesign / replacement | 1,427 | 5–10% | €400k–1,200k | — | vendor claim |
| Bulbous bow reprofiling | 1,330 | 2–6% | €300k–900k | — | vendor claim |
| Methanol dual-fuel conversion | 933 | 5–15% | €8,000k–20,000k | — | vendor claim |
| LNG dual-fuel conversion | 763 | 15–25% | €15,000k–35,000k | — | vendor claim |
| Shaft generator / PTO | 348 | 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 |
|---|---|---|---|
| HANSA AFRICA · 25-60k | E | 16y | 2026 |
| MSC ANNAMARIA · <25k | E | 1y | 2026 |
| SEPELU · <25k | E | 26y | 2026 |
| C LION · 100-200k | E | 21y | 2026 |
| HAMBURG TRADER · <25k | E | 21y | 2026 |
Note: Container/ro-ro cargo ship vessels are excluded from this ranking — their CII type is a per-vessel flag-state determination, so no valid comparison metric exists for them.
| # | Vessel | Size (TEU) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 1901 |
BAKKAFOSS
IMO 9429194
|
1,025 TEU | 2009 |
17.9
|
E |
| 1902 |
WEC JAN STEEN
IMO 9354416
|
868 TEU | 2007 |
17.9
|
E |
| 1903 |
MSC CHARLOTTE
IMO 9330238
|
1,092 TEU | 2007 |
18.0
|
E |
| 1904 |
CACHALOT
IMO 9212022
|
1,216 TEU | 2000 |
18.0
|
E |
| 1905 |
HANNA
IMO 9376048
|
868 TEU | 2008 |
18.0
|
E |
| 1906 |
AKACIA
IMO 9315020
|
1,008 TEU | 2005 |
18.1
|
E |
| 1907 |
MEDKON MERSIN
IMO 9430040
|
232 TEU | 2008 |
18.1
|
E |
| 1908 |
NETA A.
IMO 9412531
|
1,025 TEU | 2011 |
18.1
|
E |
| 1909 |
WES GESA
IMO 9504061
|
1,000 TEU | 2012 |
18.1
|
E |
| 1910 |
CAPE FULMAR
IMO 9359313
|
1,440 TEU | 2007 |
18.2
|
E |
| 1911 |
SKALAR
IMO 9458975
|
1,000 TEU | 2012 |
18.2
|
E |
| 1912 |
SAMSKIP AMINA
IMO 9448683
|
1,085 TEU | 2011 |
18.3
|
E |
| 1913 |
PAN GG
IMO 9236286
|
1,155 TEU | 2002 |
18.4
|
E |
| 1914 |
ELBWATER
IMO 9504073
|
1,000 TEU | 2012 |
18.4
|
E |
| 1915 |
MSC EDITH II
IMO 9169029
|
1,388 TEU | 1998 |
18.4
|
E |
| 1916 |
HENNEKE RAMBOW
IMO 9354430
|
868 TEU | 2007 |
18.5
|
E |
| 1917 |
CMA CGM EAST
IMO 9396622
|
1,338 TEU | 2008 |
18.5
|
E |
| 1918 |
MED DENIZLI
IMO 9106493
|
1,055 TEU | 1996 |
18.5
|
E |
| 1919 |
ELBSAILOR
IMO 9448695
|
1,085 TEU | 2012 |
18.6
|
E |
| 1920 |
MED CERKEZKOY
IMO 9147215
|
1,076 TEU | 1998 |
18.6
|
E |
| 1921 |
CONTSHIP ERA
IMO 9507702
|
1,100 TEU | 2009 |
18.6
|
E |
| 1922 |
MED URLA
IMO 9160920
|
847 TEU | 1997 |
18.6
|
E |
| 1923 |
MEDKON MAX
IMO 9347786
|
890 TEU | 2006 |
18.6
|
E |
| 1924 |
MAYFIELD
IMO 9216353
|
1,216 TEU | 2001 |
18.7
|
E |
| 1925 |
CONTSHIP JET
IMO 9348625
|
1,267 TEU | 2007 |
18.7
|
E |
| 1926 |
HELMUT
IMO 9354466
|
868 TEU | 2006 |
18.7
|
E |
| 1927 |
MSC LEVANTE F
IMO 9330264
|
1,114 TEU | 2006 |
18.7
|
E |
| 1928 |
CONTSHIP ECO
IMO 9492751
|
700 TEU | 2008 |
18.8
|
E |
| 1929 |
LYNN
IMO 9295531
|
869 TEU | 2007 |
18.8
|
E |
| 1930 |
HANSA MUNKSUND
IMO 9429223
|
1,025 TEU | 2012 |
18.8
|
E |
| 1931 |
BARBARA P
IMO 9144720
|
942 TEU | 1997 |
18.8
|
E |
| 1932 |
BALTIC WHALE
IMO 9354454
|
868 TEU | 2006 |
18.9
|
E |
| 1933 |
NOVA
IMO 9250098
|
966 TEU | 2002 |
18.9
|
E |
| 1934 |
WEC DE HOOGH
IMO 9315018
|
1,008 TEU | 2005 |
19.0
|
E |
| 1935 |
IDA RAMBOW
IMO 9354478
|
1,008 TEU | 2007 |
19.0
|
E |
| 1936 |
MEDKON CANAKKALE
IMO 9341964
|
698 TEU | 2007 |
19.0
|
E |
| 1937 |
ELBRUNNER
IMO 9395563
|
974 TEU | 2009 |
19.0
|
E |
| 1938 |
CHARLOTTA
IMO 9429209
|
877 TEU | 2009 |
19.1
|
E |
| 1939 |
ELBWAVE
IMO 9504035
|
1,000 TEU | 2011 |
19.1
|
E |
| 1940 |
JONA SOPHIE
IMO 9144718
|
942 TEU | 1997 |
19.1
|
E |
| 1941 |
BALLATA
IMO 9327578
|
1,118 TEU | 2006 |
19.1
|
E |
| 1942 |
MITO
IMO 9319571
|
1,118 TEU | 2006 |
19.1
|
E |
| 1943 |
GFS LYSA
IMO 9368730
|
1,338 TEU | 2007 |
19.1
|
E |
| 1944 |
ATLANTIC EXPRESS
IMO 9330850
|
1,114 TEU | 2007 |
19.1
|
E |
| 1945 |
MAUREN
IMO 9306251
|
1,118 TEU | 2005 |
19.2
|
E |
| 1946 |
WEC VAN RIJN
IMO 9315006
|
1,008 TEU | 2005 |
19.2
|
E |
| 1947 |
PHOENIX J
IMO 9504047
|
1,036 TEU | 2010 |
19.3
|
E |
| 1948 |
MSC AZURIT F
IMO 9403437
|
1,118 TEU | 2008 |
19.3
|
E |
| 1949 |
MSC ABIGAIL F
IMO 9330226
|
1,102 TEU | 2006 |
19.3
|
E |
| 1950 |
ISABELLA B
IMO 9483358
|
1,036 TEU | 2012 |
19.3
|
E |
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.
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.