Navalyze · Oil tanker · Ship

SIENA

IMO: 1030404
Type: Oil tanker
Average cargo carried: 103,523 t
Port of registry: Nassau
Technical efficiency: EEDI 2.24 g CO₂/t·nm

ISM company (DoC holder) in 2025: ALBERTA SHIPMANAGEMENT LTD.

2025 at a glance

From the 2025 THETIS-MRV report. Carries about 103,523 t of cargo on average.

Fuel per mile

146.4 kg/nm

Oil tanker median 128.5 kg/nm (+14%)

CO₂ per transport work (cargo)

4.44

g CO₂/t·nm · Oil tanker median 7.95 (−44%)

Average speed

8.2 kn

Oil tanker median 10.7 kn (−23%)

Fuel per day at sea

28.8 t/day

Fuel consumed

948 t

CO₂ emitted

2,977 t

3,024 t CO₂eq incl. CH₄ and N₂O

Distance sailed

6,477 nm

CO₂ ÷ CO₂ per mile

Time at sea

791 h

33 days, 9% of the year

Within the oil tanker fleet, 2025

Set against all 1,665 oil tanker 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 per mileThis ship 146.4 kg/nm · median 128.5 (+14%)

76.1Ranks 1,116 of 1,665, lowest first190.8

Average speedThis ship 8.2 kn · median 10.7 (−23%)

8.0Faster than 11% of oil tanker ships12.1

CO₂ per transport work (cargo)This ship 4.44 g CO₂/t·nm · median 7.95 (−44%)

4.51Ranks 157 of 1,665, lowest first27.66

Middle 80% of shipsMiddle 50%Oil tanker 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 ports16%
From the EU4%
Into the EU63%
At berth in the EU17%

67% of this ship's CO₂ falls under the EU ETS (1,982 t).

Fuel burned laden

–

Not reported

CO₂ at berth

16.9%

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

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	ALBERTA SHIPMANAGEMENT LTD.	948	2,977	6,477	791	8.2	146.4	4.44	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/t·nm	Oil tanker median	vs Oil tanker	Rank	Verifier	Methods
2025	ALBERTA SHIPMANAGEMENT LTD.	4.44	7.95	−44%	157 of 1,665	Lloyd's Register	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Oil tanker 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 oil tanker 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.