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 · 551 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 |
|---|---|---|---|---|---|
| 2151 |
SUNAID X
IMO 9358539
|
698 TEU | 2006 |
25.6
|
E |
| 2152 |
SCARLETTA
IMO 9449699
|
957 TEU | 2008 |
25.6
|
E |
| 2153 |
CONTSHIP PAX
IMO 9435521
|
1,118 TEU | 2008 |
25.7
|
E |
| 2154 |
X-PRESS MULHACEN
IMO 9365960
|
767 TEU | 2008 |
25.7
|
E |
| 2155 |
ENERGY
IMO 9255787
|
750 TEU | 2004 |
25.8
|
E |
| 2156 |
VM VITA
IMO 9141118
|
749 TEU | 1996 |
25.8
|
E |
| 2157 |
LAGOA
IMO 9150470
|
375 TEU | 1997 |
25.8
|
E |
| 2158 |
LUCY BORCHARD
IMO 9390824
|
228 TEU | 2006 |
25.8
|
E |
| 2159 |
MSC MANON
IMO 9435820
|
312 TEU | 2008 |
25.8
|
E |
| 2160 |
CMA CGM GOYA
IMO 9365972
|
809 TEU | 2008 |
25.9
|
E |
| 2161 |
DREAM
IMO 9322578
|
804 TEU | 2006 |
25.9
|
E |
| 2162 |
WEC MAJORELLE
IMO 9134153
|
700 TEU | 1996 |
26.0
|
E |
| 2163 |
MSC AMIHAN F
IMO 9449687
|
957 TEU | 2008 |
26.0
|
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.