Navalyze · Ro-pax · Ship

SILJA SERENADE

IMO: 8715259
Type: Ro-pax ship
Flag (estimated): Finland
Port of registry: Mariehamn
Technical efficiency: EIV 2.87 g CO₂/t·nm
Ice class: IA

ISM company (DoC holder) in 2025: HT Shipmanagement OU

Report year

2019 at a glance

From the 2019 THETIS-MRV report.

Fuel kg/nm

189

Ro-pax median 155 kg/nm (+22%)

CO₂ per transport work (pax)

257

g CO₂/pax·nm · Ro-pax median 569 (−55%)

CO₂ per transport work (freight)

63.9

g CO₂/t·nm · Ro-pax median 223 (−71%)

Average speed

15.2 kn

Ro-pax median 15.8 kn (−4%)

Fuel per day at sea

69.1 t/day

Fuel consumed

17,903 t

CO₂ emitted

56,414 t

Distance sailed

94,612 nm

CO₂ ÷ CO₂ per mile

Time at sea

6,222 h

259 days, 71% 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 178 kg/nm · median 150 (+19%)

69.3Ranks 285 of 408, lowest first232

Average speedThis ship 15.2 kn · median 15.8 (−4%)

12.0Faster than 40% of ro-pax ships22.3

CO₂ per transport work (pax)This ship 337 g CO₂/pax·nm · median 567 (−41%)

66.8Ranks 155 of 408, lowest first1,569

CO₂ per transport work (freight)This ship 126 g CO₂/t·nm · median 253 (−50%)

48.6Ranks 121 of 408, lowest first1,247

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

Where the emissions happen, 2019

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 ports92%
From the EU0%
Into the EU0%
At berth in the EU8%

Fuel burned laden

–

Not reported

CO₂ at berth

4,321 t

7.7% 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

SILJA SERENADE
Ro-pax median

150.0175.0200.0225.0250.0

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

Average speed, kn

SILJA SERENADE
Ro-pax median

14.515.015.516.016.5

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

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

SILJA SERENADE
Ro-pax median

50.0100150200250300

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

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

SILJA SERENADE
Ro-pax median

2004006008001,000

’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%	−8%	+0%	Same speed, fuel per mile up 3%; in line with the speed change.
2023→2024	+0.2 kn	+1%	+3%	+6%	+18%	Same speed, fuel per mile flat.
2022→2023	−0.2 kn	−5%	−6%	+18%	−7%	Same speed, fuel per mile down 5%; in line with the speed change.
2021→2022	+0.6 kn	−13%	−10%	+54%	−28%	0.6 kn faster, fuel per mile down 13%; better than speed alone explains (hull, engine or trade).
2020→2021	−1.3 kn	−11%	−18%	+13%	+42%	1.3 kn slower, fuel per mile down 11%; in line with the speed change.
2019→2020	+0.7 kn	+23%	+28%	−53%	+17%	0.7 kn faster, fuel per mile up 23%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	−0.1 kn	−6%	−7%	+2%	−4%	Same speed, fuel per mile down 6%; in line with the speed change.

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	HT Shipmanagement OU	15,905	50,990	89,219	5,870	15.2	178	–	–
2024	HT Shipmanagement OU	16,687	52,793	96,839	6,370	15.2	172	–	–
2023	not published	15,450	49,489	90,995	6,064	15.0	170	–	–
2022	not published	13,788	43,447	76,941	5,072	15.2	179	–	–
2021	not published	10,343	32,593	49,971	3,431	14.6	207	–	–
2020	not published	10,232	32,243	44,062	2,776	15.9	232	–	–
2019	not published	17,903	56,414	94,612	6,222	15.2	189	–	–
2018	not published	18,704	58,937	92,751	6,052	15.3	202	–	–

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	HT Shipmanagement OU	337	567	−41%	155 of 408	126	253	−50%	Verifavia	C
2024	HT Shipmanagement OU	336	547	−38%	150 of 404	136	233	−41%	Verifavia	C
2023	not published	285	680	−58%	108 of 386	140	234	−40%	Verifavia	C
2022	not published	308	626	−51%	125 of 394	78.8	253	−69%	Verifavia	C
2021	not published	427	815	−48%	142 of 377	83.6	226	−63%	Verifavia	C
2020	not published	301	751	−60%	118 of 387	103	217	−53%	Verifavia	C
2019	not published	257	569	−55%	121 of 394	63.9	223	−71%	Verifavia	C
2018	not published	267	729	−63%	113 of 361	61.6	184	−67%	Verifavia	C

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.