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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.

4,420
vessels at CII band D or E — emissions performance below the IMO requirement
8,522
vessels with a likely drydock window in the next 12 months
11.63 Mt
ETS-scope CO₂ emissions of the D/E-and-docking set (latest MRV year)
searching…
Presets:
Bulk Carrier Container Ship Oil Tanker Chemical Tanker Gas Carrier LNG Carrier General Cargo Vehicle Carrier Refrigerated Cargo Ro-Ro Cargo

CII bands by segment

Bulk Carrier
28% D/E
4,717 rated · 2,065 docking ≤12m
Top eligible measure: Propeller redesign / replacement
Container Ship
43% D/E
2,510 rated · 1,129 docking ≤12m
Top eligible measure: Turbocharger cut-out
Oil Tanker
27% D/E
2,075 rated · 1,070 docking ≤12m
Top eligible measure: Propeller redesign / replacement
Chemical Tanker
24% D/E
1,698 rated · 737 docking ≤12m
Top eligible measure: Propeller redesign / replacement
Gas Carrier
20% D/E
425 rated · 202 docking ≤12m
Top eligible measure: Propeller redesign / replacement
LNG Carrier
16% D/E
448 rated · 221 docking ≤12m
Top eligible measure: Propeller redesign / replacement
General Cargo
19% D/E
2,735 rated · 1,158 docking ≤12m
Top eligible measure: Propeller redesign / replacement
Vehicle Carrier
32% D/E
541 rated · 245 docking ≤12m
Top eligible measure: Turbocharger cut-out
Refrigerated Cargo
23% D/E
124 rated · 54 docking ≤12m
Top eligible measure: Propeller redesign / replacement
Ro-Ro Cargo
27% D/E
172 rated · 83 docking ≤12m
Top eligible measure: Propeller redesign / replacement

Retrofit prospects — 15,885 rated vessels

Worst band first Greenest first
Vessel Band Age Drop year
PAULA GLORY E 3y 2026
STAITHES E 12y 2026
OLYMPIC TROPHY E 16y 2026
SEALING E 23y 2026
PACIFIC INTEGRITY E 15y 2026
See the other 15,880 rated vessels with filters, EU exposure and dock windows. Sign in →

Payback figures appear once price parameters are configured — no placeholder numbers are shown.

Retrofit measure library

Reduction ranges are vendor/literature claims until our measured-outcome dataset replaces them — the confidence flag on every tile says which.

Propeller redesign / replacement
vendor claim
5–10% CO₂ · drydock
12,286 eligible details →
Bulbous bow reprofiling
vendor claim
2–6% CO₂ · drydock
9,484 eligible details →
Turbocharger cut-out
vendor claim
1–3% CO₂
6,767 eligible details →
Methanol dual-fuel conversion
vendor claim
5–15% CO₂ · drydock
5,948 eligible details →
LNG dual-fuel conversion
vendor claim
15–25% CO₂ · drydock
4,868 eligible details →
Rotor sails (per unit)
vendor claim
route-dependent, not modelled
4,734 eligible details →
Suction wing sails (per unit)
vendor claim
route-dependent, not modelled
4,734 eligible details →
Shaft generator / PTO
vendor claim
3–6% CO₂ · drydock
3,963 eligible details →
Exhaust waste heat recovery
vendor claim
3–8% CO₂ · drydock
1,951 eligible details →
Air lubrication system
vendor claim
5–10% CO₂ · drydock
4,995 candidates (fitment unverified) details →
Engine derating / EPL / ShaPoLi
vendor claim
3–10% CO₂
15,802 candidates (fitment unverified) details →
Pre-swirl duct
vendor claim
3–8% CO₂ · drydock
10,029 candidates (fitment unverified) details →
Pre-swirl stator fins
vendor claim
2–6% CO₂ · drydock
10,023 candidates (fitment unverified) details →
Propeller boss cap fins
vendor claim
2–5% CO₂ · drydock
14,642 candidates (fitment unverified) details →
Rudder bulb / twisted rudder
vendor claim
2–6% CO₂ · drydock
14,642 candidates (fitment unverified) details →
Shore power / OPS connection
vendor claim
0–0% CO₂ · drydock
14,927 candidates (fitment unverified) details →
Silicone foul-release coating
vendor claim
3–8% CO₂ · drydock
15,802 candidates (fitment unverified) details →
VFDs on pumps and fans
vendor claim
1–3% CO₂
15,802 candidates (fitment unverified) details →
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

CO₂ efficiency rankings — the evidence layer under the radar

Every vessel ranked by measured AER within its segment and size class, from official EU MRV emissions data. This ranking is what the CII bands above are computed from.

Bulk Carrier → Container Ship → Oil Tanker → Chemical Tanker → Gas Carrier → LNG Carrier → General Cargo → Vehicle Carrier → Refrigerated Cargo → Ro-Ro Cargo →

Methodology & coverage

19,352
vessels with EU MRV emissions data (of 189,804 tracked — MRV covers ≥5,000 GT calling EEA ports)
15,885
CII-rated (year 2025; MRV publishes with ~6-month lag)
19,352
with an estimated drydock window (class-expiry model)
125
outside CII scope by regulation (56) or pending type determination (69)

Denominator per segment: Bulk Carrier (DWT), Container Ship (DWT/—), Oil Tanker (DWT), Chemical Tanker (DWT), Gas Carrier (DWT), LNG Carrier (DWT), General Cargo (DWT), Vehicle Carrier (GT), Refrigerated Cargo (DWT), Ro-Ro Cargo (GT).

Measure data confidence: 18 vendor claim — reduction ranges are claims until measured outcomes replace them.

Documented assumptions: CII rating boundaries applied inclusively (ratio ≤ dᵢ; G4 is silent); voyage distances are great-circle; dock windows derive from a class-expiry model, not bookings; no berth-slot availability data exists.

Coefficients: MEPC.353(78), MEPC.354(78), MEPC.400(83) — config version 2229a18fc976cde4. Source: EU MRV (Regulation (EU) 2015/757), the EU system for Monitoring, Reporting and Verification of CO₂ emissions from ships calling at EEA ports. Operational intensity reflects real reported voyages, not just design efficiency.