Navalyze · Reefer · Ship

SIERRA QUEEN

IMO: 9127928
Type: Refrigerated cargo carrier
Average cargo carried: 3,187 t
Flag (estimated): Bahamas
Port of registry: Nassau
Technical efficiency: EEXI 21.60 g CO₂/t·nm

ISM company (DoC holder) in 2025: Seatrade Groningen B.V. · part of Seatrade

Report year

2021 at a glance

From the 2021 THETIS-MRV report. Carries about 2,840 t of cargo on average.

Fuel kg/nm

68.4

Reefer median 84.1 kg/nm (−19%)

CO₂ per transport work (cargo)

75.5

g CO₂/t·nm · Reefer median 55.0 (+37%)

Average speed

14.7 kn

Reefer median 15.5 kn (−5%)

Fuel per day at sea

24.1 t/day

Fuel consumed

1,692 t

CO₂ emitted

5,305 t

Distance sailed

24,734 nm

CO₂ ÷ CO₂ per mile

Time at sea

1,684 h

70 days, 19% of the year

Within the reefer fleet, 2025

Set against all 109 reefer 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 61.6 kg/nm · median 82.9 (−26%)

55.8Ranks 18 of 109, lowest first118

Average speedThis ship 9.1 kn · median 14.6 (−38%)

8.2Faster than 12% of reefer ships16.7

CO₂ per transport work (cargo)This ship 60.6 g CO₂/t·nm · median 56.8 (+7%)

36.7Ranks 63 of 109, lowest first140

Middle 80% of shipsMiddle 50%Reefer 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 ports3%
From the EU46%
Into the EU48%
At berth in the EU3%

Fuel burned laden

–

Not reported

CO₂ at berth

166 t

3.1% 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 Reefer median is the middle ship of all reefer ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel kg/nm

SIERRA QUEEN
Reefer median

50.060.070.080.090.0

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

Average speed, kn

SIERRA QUEEN
Reefer median

6.08.010.012.014.016.0

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

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

SIERRA QUEEN
Reefer median

40.050.060.070.080.0

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

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	+1.5 kn	−8%	+11%	+47%	+20%	1.5 kn faster, fuel per mile down 8%; better than speed alone explains (hull, engine or trade).
2023→2024	−5.6 kn	+14%	−34%	+142%	+27%	5.6 kn slower, fuel per mile up 14%; worse than speed alone explains (fouling, weather, loading or trade).
2021→2023	−1.5 kn	−14%	−23%	−53%	−47%	1.5 kn slower, fuel per mile down 14%; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	+0.2 kn	−1%	+0%	+74%	+59%	Same speed, fuel per mile flat.
2019→2020	+0.1 kn	+8%	+10%	−48%	−16%	Same speed, fuel per mile up 8%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	−1.2 kn	+2%	−5%	−19%	−29%	1.2 kn slower, fuel per mile up 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	Hours at seah	Average speedknots at sea	Fuel kg/nmthis ship	CO₂ per transport work (cargo)g/t·nm, this ship	Laden fuel
2025	Seatrade Groningen B.V.	2,560	8,031	41,557	4,551	9.1	61.6	60.6	–
2024	Seatrade Groningen B.V.	1,896	5,954	28,256	3,729	7.6	67.1	50.7	–
2023	not published	691	2,168	11,694	889	13.2	59.1	40.0	–
2021	not published	1,692	5,305	24,734	1,684	14.7	68.4	75.5	–
2020	not published	982	3,075	14,228	980	14.5	69.0	47.6	–
2019	not published	1,732	5,425	27,216	1,890	14.4	63.6	56.5	–
2018	not published	2,092	6,560	33,710	2,165	15.6	62.1	79.4	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Reefer median	vs Reefer	Rank	Verifier	Methods
2025	Seatrade Groningen B.V.	60.6	56.8	+7%	63 of 109	Bureau Veritas	A
2024	Seatrade Groningen B.V.	50.7	58.7	−14%	40 of 108	Bureau Veritas	A
2023	not published	40.0	55.6	−28%	23 of 135	Bureau Veritas	A+B
2021	not published	75.5	55.0	+37%	133 of 158	Bureau Veritas	A
2020	not published	47.6	59.1	−19%	37 of 149	Bureau Veritas	A
2019	not published	56.5	62.6	−10%	59 of 147	Bureau Veritas	A
2018	not published	79.4	72.8	+9%	86 of 136	Bureau Veritas	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Reefer 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 reefer 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.