Navalyze · Container · Ship

MAERSK IOWA

IMO: 9298686
Type: Container ship
Average cargo carried: 32,281 t
Flag (estimated): United States
Port of registry: Norfolk
Technical efficiency: EEXI 13.20 g CO₂/t·nm
Fuel (estimated): Oil blended with biofuel or another alternative fuel

ISM company (DoC holder) in 2025: Maersk Line, Limited-USA · part of Maersk

Report year

2021 at a glance

From the 2021 THETIS-MRV report. Carries about 37,027 t of cargo on average.

Fuel kg/nm

193

Container median 186 kg/nm (+4%)

CO₂ per transport work (cargo)

16.3

g CO₂/t·nm · Container median 17.9 (−9%)

Average speed

15.3 kn

Container median 14.1 kn (+9%)

Fuel per day at sea

71.2 t/day

Fuel consumed

15,710 t

CO₂ emitted

48,930 t

Distance sailed

81,321 nm

CO₂ ÷ CO₂ per mile

Time at sea

5,298 h

221 days, 60% of the year

Within the container fleet, 2025

Set against all 2,208 container ships with a full-year 2025 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 kg/nmThis ship 173 kg/nm · median 177 (−2%)

78.8Ranks 1,075 of 2,208, lowest first302

Average speedThis ship 15.3 kn · median 13.3 (+15%)

9.1Faster than 80% of container ships16.0

CO₂ per transport work (cargo)This ship 16.5 g CO₂/t·nm · median 16.3 (+1%)

7.22Ranks 1,122 of 2,208, lowest first46.9

Middle 80% of shipsMiddle 50%Container medianThis ship

Where the emissions happen, 2021

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 ports6%
From the EU47%
Into the EU45%
At berth in the EU2%

Fuel burned laden

–

Not reported

CO₂ at berth

856 t

1.8% of the ship's CO₂, alongside in EU ports

Methane (CH₄)

–

Mainly from LNG; small for oil, biofuel and methanol

CO₂eq uplift

–

CO₂eq on top of CO₂ alone, from CH₄ and N₂O

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 kg/nm

MAERSK IOWA
Container median

125.0150.0175.0200.0225.0

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

Average speed, kn

MAERSK IOWA
Container median

12.014.016.018.0

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

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

MAERSK IOWA
Container median

10.012.515.017.520.022.5

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

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	+2.1 kn	−0%	+16%	−8%	+22%	2.1 kn faster, fuel per mile flat; better than speed alone explains (hull, engine or trade).
2023→2024	−1.6 kn	+26%	+13%	−4%	+12%	1.6 kn slower, fuel per mile up 26%; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	+0.4 kn	−25%	−23%	−0%	−15%	0.4 kn faster, fuel per mile down 25%; better than speed alone explains (hull, engine or trade).
2021→2022	−0.9 kn	−5%	−11%	−12%	−12%	0.9 kn slower, fuel per mile down 5%; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	−1.8 kn	−0%	−10%	+2%	−9%	1.8 kn slower, fuel per mile flat; worse than speed alone explains (fouling, weather, loading or trade).
2019→2020	+1.0 kn	−3%	+3%	−4%	+2%	1.0 kn faster, fuel per mile down 3%; better than speed alone explains (hull, engine or trade).
2018→2019	−1.3 kn	−9%	−16%	+1%	−4%	1.3 kn slower, fuel per mile down 9%; 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	Hours at seah	Average speedknots at sea	Fuel kg/nmthis ship	CO₂ per transport work (cargo)g/t·nm, this ship	Laden fuel
2025Bio blend	Maersk Line, Limited-USA	10,845	33,437	62,626	4,096	15.3	173	16.5	99%
2024Bio blend	Maersk Line, Limited-USA	11,780	36,081	67,952	5,161	13.2	173	13.6	98%
2023	not published	9,725	30,291	70,858	4,800	14.8	137	12.1	98%
2022	not published	13,057	39,820	71,200	4,938	14.4	183	14.2	98%
2021	not published	15,710	48,930	81,321	5,298	15.3	193	16.3	–
2020	not published	15,407	47,989	79,481	4,651	17.1	194	17.8	100%
2019	not published	16,408	51,163	82,395	5,102	16.1	199	17.3	100%
2018	not published	17,804	55,631	81,244	4,659	17.4	219	18.1	100%

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Container median	vs Container	Rank	Verifier	Methods
2025Bio blend	Maersk Line, Limited-USA	16.5	16.3	+1%	1,122 of 2,208	ABS	C
2024Bio blend	Maersk Line, Limited-USA	13.6	17.5	−22%	730 of 1,974	ABS	C
2023	not published	12.1	19.4	−37%	543 of 1,899	ABS	C
2022	not published	14.2	19.1	−26%	642 of 1,825	ABS	C
2021	not published	16.3	17.9	−9%	796 of 1,781	ABS	C
2020	not published	17.8	17.6	+1%	913 of 1,797	ABS	C
2019	not published	17.3	18.9	−8%	803 of 1,788	ABS	C
2018	not published	18.1	20.2	−11%	737 of 1,705	ABS	C

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.