Navalyze · Container · Ship

POTOMAC EXPRESS

IMO: 9349526
Type: Container ship
Port of registry: Norfolk, Va
Technical efficiency: EEXI 10.46 g CO₂/t·nm
Former names: MAYSSAN

ISM company (DoC holder) in 2025: Marine Transport Management

Report year

2025 at a glance

From the 2025 THETIS-MRV report.

Fuel per mile

183.4 kg/nm

CO₂ per transport work (cargo)

–

g CO₂/t·nm

Average speed

14.3 kn

Fuel per day at sea

62.9 t/day

Fuel consumed

1,994 t

CO₂ emitted

6,255 t

6,353 t CO₂eq incl. CH₄ and N₂O

Distance sailed

10,872 nm

CO₂ ÷ CO₂ per mile

Time at sea

761 h

32 days, 9% of the year

Within the container fleet, 2024

Set against all 1,974 container ships with a full-year 2024 report. Bigger ships burn more per mile but less per tonne of cargo, so read fuel per mile with the ship's size in mind.

Fuel per mileThis ship 169.0 kg/nm · median 167.2 (+1%)

78.9Ranks 1,005 of 1,974, lowest first301.6

Average speedThis ship 14.8 kn · median 13.5 (+10%)

9.6Faster than 71% of container ships16.1

CO₂ per transport work (cargo)This ship 12.31 g CO₂/t·nm · median 17.52 (−30%)

7.33Ranks 630 of 1,974, lowest first51.62

Middle 80% of shipsMiddle 50%Container medianThis ship

Where the emissions happen, 2025

THETIS splits each ship's CO₂ by voyage type. The split sets how much falls under the EU ETS: all of it within the EU and at berth, half of it on voyages into or out of the EU.

Between EU ports9%
From the EU60%
Into the EU27%
At berth in the EU4%

56% of this ship's CO₂ falls under the EU ETS (3,527 t).

Fuel burned laden

97%

4% in ballast or unladen

CO₂ at berth

3.5%

Alongside in EU ports

Methane (CH₄)

0.1 t

Mainly from LNG; small for oil

CO₂eq ÷ CO₂

1.016

Uplift from CH₄ and N₂O, counted in full from 2026

Over the years

Full-year reports only. The Container median is the middle ship of all container ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel per mile, kg/nm

POTOMAC EXPRESS
Container median

150.0175.0200.0225.0250.0275.0

’182018’192019’202020’212021’222022’232023’242024’252025

Average speed, kn

POTOMAC EXPRESS
Container median

12.014.016.018.0

’182018’192019’202020’212021’222022’232023’242024’252025

CO₂ per transport work (cargo), g CO₂/t·nm

POTOMAC EXPRESS
Container median

12.014.016.018.020.022.0

’182018’192019’202020’212021’222022’232023’242024

Year on year

Year	Speed	Fuel per mile	Fuel per day	Distance	CO₂ per TW	Reading
2024→2025	−0.5 kn	+9%	+5%	−78%	–	0.5 kn slower, fuel per mile up 9%; worse than speed alone explains (fouling, weather, loading or trade).
2023→2024	−0.5 kn	−20%	−23%	+35%	−38%	0.5 kn slower, fuel per mile down 20%; better than speed alone explains (hull, engine or trade).
2022→2023	−1.8 kn	−12%	−21%	−21%	+28%	1.8 kn slower, fuel per mile down 12%; worse than speed alone explains (fouling, weather, loading or trade).
2021→2022	+3.2 kn	+6%	+31%	+39%	+10%	3.2 kn faster, fuel per mile up 6%; better than speed alone explains (hull, engine or trade).
2020→2021	+0.5 kn	+2%	+6%	+8%	+4%	0.5 kn faster, fuel per mile up 2%; better than speed alone explains (hull, engine or trade).
2019→2020	+1.3 kn	−13%	−3%	+4%	−11%	1.3 kn faster, fuel per mile down 13%; better than speed alone explains (hull, engine or trade).
2018→2019	−0.8 kn	−2%	−8%	+36%	−0%	0.8 kn slower, fuel per mile down 2%; worse than speed alone explains (fouling, weather, loading or trade).

Fuel per mile rises roughly with the square of speed for a given ship, so a change in speed explains much of a change in fuel per mile.

Every reporting year

One row per THETIS-MRV report. A ship that changed operator during a year has a part-year report for each.

Operation

Year	ISM company	Fuel t	CO₂ t	Distance nm	At sea h	Speed kn	Fuel kg/nm	CO₂ g/t·nm	Laden fuel
2025	Marine Transport Management	1,994	6,255	10,872	761	14.3	183.4	–	97%
2024	Marine Transport Management	8,211	25,715	48,592	3,287	14.8	169.0	12.31	96%
2023	not published	7,632	23,932	36,068	2,358	15.3	211.6	19.77	96%
2022	not published	10,958	34,472	45,586	2,664	17.1	240.4	15.49	96%
2021	not published	7,418	23,284	32,795	2,360	13.9	226.2	14.02	94%
2020	not published	6,755	21,315	30,503	2,276	13.4	221.4	13.51	–
2019	not published	7,446	23,253	29,332	2,433	12.1	253.8	15.10	–
2018	not published	5,589	17,428	21,547	1,675	12.9	259.4	15.15	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Container median	vs Container	Rank	Verifier	Methods
2025	Marine Transport Management	–	–	–	–	ABS	A
2024	Marine Transport Management	12.31	17.52	−30%	630 of 1,974	ABS	–
2023	not published	19.77	19.40	+2%	974 of 1,899	ABS	–
2022	not published	15.49	19.13	−19%	739 of 1,825	ABS	–
2021	not published	14.02	17.90	−22%	632 of 1,781	ABS	–
2020	not published	13.51	17.58	−23%	618 of 1,797	DNV	A
2019	not published	15.10	18.88	−20%	660 of 1,788	DNV	A
2018	not published	15.15	20.22	−25%	554 of 1,705	DNV	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Container ships are benchmarked on CO₂ per transport work (cargo) (TW), in g CO₂/t·nm. CO₂eq adds methane and nitrous oxide and is in the public files from 2024. Rank counts from the lowest figure among that year's container ships. Methods: A delivery notes, B tank monitoring, C flow meters, D direct measurement. FuelEU GHG intensity is not shown: it needs fuel types, which the public file does not carry. Operators are named only from 2024, the first year the public files carry them; earlier years belong to the ship, not to any company.