Navalyze · Ro-pax · Ship

SIRENA SEAWAYS

IMO: 9212163
Type: Ro-pax ship
Flag (estimated): Lithuania
Port of registry: Klaipeda
Technical efficiency: EEXI 26.17 g CO₂/t·nm
Former names: BAIE DE SEINE

ISM company (DoC holder) in 2025: AB DFDS Seaways · part of DFDS

Report year

2020 at a glance

From the 2020 THETIS-MRV report.

Fuel kg/nm

119

Ro-pax median 157 kg/nm (−24%)

CO₂ per transport work (pax)

1,049

g CO₂/pax·nm · Ro-pax median 751 (+40%)

CO₂ per transport work (freight)

204

g CO₂/t·nm · Ro-pax median 217 (−6%)

Average speed

16.3 kn

Ro-pax median 15.8 kn (+3%)

Fuel per day at sea

46.5 t/day

Fuel consumed

8,270 t

CO₂ emitted

26,460 t

Distance sailed

69,412 nm

CO₂ ÷ CO₂ per mile

Time at sea

4,268 h

178 days, 49% of the year

Within the ro-pax fleet, 2025

Set against all 408 ro-pax 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 90.5 kg/nm · median 150 (−40%)

69.3Ranks 83 of 408, lowest first232

Average speedThis ship 15.5 kn · median 15.8 (−2%)

12.0Faster than 44% of ro-pax ships22.3

CO₂ per transport work (pax)This ship 1,353 g CO₂/pax·nm · median 567 (+139%)

66.8Ranks 350 of 408, lowest first1,569

CO₂ per transport work (freight)This ship 47.9 g CO₂/t·nm · median 253 (−81%)

48.6Ranks 40 of 408, lowest first1,247

Middle 80% of shipsMiddle 50%Ro-pax medianThis ship

Where the emissions happen, 2020

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 ports82%
From the EU0%
Into the EU0%
At berth in the EU18%

Fuel burned laden

–

Not reported

CO₂ at berth

4,652 t

17.6% 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 Ro-pax median is the middle ship of all ro-pax ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel kg/nm

SIRENA SEAWAYS
Ro-pax median

80.0100.0120.0140.0160.0

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

Average speed, kn

SIRENA SEAWAYS
Ro-pax median

15.016.017.018.0

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

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

SIRENA SEAWAYS
Ro-pax median

0.0100200300

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

CO₂ per transport work (pax), g CO₂/pax·nm

SIRENA SEAWAYS
Ro-pax median

0.05001,0001,500

’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	+0.0 kn	+3%	+3%	−2%	+5%	Same speed, fuel per mile up 3%; in line with the speed change.
2023→2024	+0.2 kn	−4%	−2%	+14%	+88%	Same speed, fuel per mile down 4%; better than speed alone explains (hull, engine or trade).
2022→2023	−0.1 kn	−10%	−10%	+12%	−4%	Same speed, fuel per mile down 10%; better than speed alone explains (hull, engine or trade).
2021→2022	−0.6 kn	−5%	−9%	−23%	−21%	0.6 kn slower, fuel per mile down 5%; in line with the speed change.
2020→2021	−0.3 kn	−11%	−12%	+37%	−13%	0.3 kn slower, fuel per mile down 11%; better than speed alone explains (hull, engine or trade).
2019→2020	−1.5 kn	−9%	−17%	−34%	+400%	1.5 kn slower, fuel per mile down 9%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	+0.7 kn	+3%	+7%	−7%	+7%	0.7 kn faster, fuel per mile up 3%; better than speed alone explains (hull, engine 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	AB DFDS Seaways	8,368	26,387	92,489	5,983	15.5	90.5	–	–
2024	AB DFDS Seaways	8,256	26,039	93,910	6,061	15.5	87.9	–	–
2023	not published	7,528	23,748	82,258	5,388	15.3	91.5	–	–
2022	not published	7,417	23,459	73,286	4,772	15.4	101	–	–
2021	not published	10,107	31,892	95,037	5,925	16.0	106	–	–
2020	not published	8,270	26,460	69,412	4,268	16.3	119	–	–
2019	not published	13,765	44,132	104,850	5,902	17.8	131	–	–
2018	not published	14,420	46,218	113,271	6,640	17.1	127	–	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/pax·nm	Ro-pax median	vs Ro-pax	Rank	Freight, g CO₂/t·nm	Ro-pax median	vs Ro-pax	Verifier	Methods
2025	AB DFDS Seaways	1,353	567	+139%	350 of 408	47.9	253	−81%	DNV	B
2024	AB DFDS Seaways	1,291	547	+136%	325 of 404	58.0	233	−75%	DNV	C
2023	not published	688	680	+1%	199 of 386	107	234	−54%	DNV	C
2022	not published	720	626	+15%	211 of 394	100.0	253	−60%	DNV	C
2021	not published	910	815	+12%	199 of 377	116	226	−49%	Verifavia	C
2020	not published	1,049	751	+40%	226 of 387	204	217	−6%	Verifavia	C
2019	not published	210	569	−63%	110 of 394	208	223	−7%	Bureau Veritas	A
2018	not published	195	729	−73%	94 of 361	194	184	+5%	Bureau Veritas	A

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Ro-pax ships are benchmarked on CO₂ per transport work (pax) (TW), in g CO₂/pax·nm, and also per tonne of freight (g CO₂/t·nm freight). CO₂eq adds methane and nitrous oxide and is in the public files from 2024. Rank counts from the lowest figure among that year's ro-pax 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.