Navalyze · Ro-pax · Ship

SILJA SYMPHONY

IMO: 8803769
Type: Ro-pax ship
Flag (estimated): Sweden
Port of registry: Stockholm
Technical efficiency: EIV 2.95 g CO₂/t·nm
Ice class: IA Super

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

Report year

2018 at a glance

From the 2018 THETIS-MRV report.

Fuel kg/nm

198

Ro-pax median 158 kg/nm (+25%)

CO₂ per transport work (pax)

262

g CO₂/pax·nm · Ro-pax median 729 (−64%)

CO₂ per transport work (freight)

74.8

g CO₂/t·nm · Ro-pax median 184 (−59%)

Average speed

15.5 kn

Ro-pax median 16.1 kn (−4%)

Fuel per day at sea

73.6 t/day

Fuel consumed

19,068 t

CO₂ emitted

60,083 t

Distance sailed

96,548 nm

CO₂ ÷ CO₂ per mile

Time at sea

6,220 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 172 kg/nm · median 150 (+14%)

69.3Ranks 274 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 329 g CO₂/pax·nm · median 567 (−42%)

66.8Ranks 150 of 408, lowest first1,569

CO₂ per transport work (freight)This ship 122 g CO₂/t·nm · median 253 (−52%)

48.6Ranks 115 of 408, lowest first1,247

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

Where the emissions happen, 2018

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 ports91%
From the EU0%
Into the EU0%
At berth in the EU9%

Fuel burned laden

–

Not reported

CO₂ at berth

5,552 t

9.2% 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 SYMPHONY
Ro-pax median

140.0160.0180.0200.0220.0240.0

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

Average speed, kn

SILJA SYMPHONY
Ro-pax median

15.015.516.016.5

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

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

SILJA SYMPHONY
Ro-pax median

50.0100150200250300

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

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

SILJA SYMPHONY
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	−7%	−7%	+0%	−3%	Same speed, fuel per mile down 7%; better than speed alone explains (hull, engine or trade).
2023→2024	+0.1 kn	+1%	+2%	+4%	+14%	Same speed, fuel per mile flat.
2022→2023	+0.0 kn	+2%	+2%	−2%	−6%	Same speed, fuel per mile up 2%; in line with the speed change.
2021→2022	−0.2 kn	−10%	−11%	+99%	−23%	Same speed, fuel per mile down 10%; better than speed alone explains (hull, engine or trade).
2020→2021	+0.2 kn	−11%	−10%	+37%	+16%	Same speed, fuel per mile down 11%; better than speed alone explains (hull, engine or trade).
2019→2020	−0.2 kn	+12%	+11%	−62%	+34%	Same speed, fuel per mile up 12%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	−0.2 kn	+0%	−1%	−5%	+0%	Same speed, fuel per mile flat.

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	16,608	53,246	96,586	6,369	15.2	172	–	–
2024	HT Shipmanagement OU	17,729	56,087	96,164	6,334	15.2	184	–	–
2023	not published	16,874	54,099	92,738	6,127	15.1	182	–	–
2022	not published	16,842	53,071	94,455	6,268	15.1	178	–	–
2021	not published	9,433	29,724	47,520	3,109	15.3	199	–	–
2020	not published	7,687	24,224	34,606	2,288	15.1	222	–	–
2019	not published	18,093	57,023	91,329	5,972	15.3	198	–	–
2018	not published	19,068	60,083	96,548	6,220	15.5	198	–	–

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	329	567	−42%	150 of 408	122	253	−52%	Verifavia	C
2024	HT Shipmanagement OU	339	547	−38%	152 of 404	136	233	−41%	Verifavia	C
2023	not published	297	680	−56%	110 of 386	116	234	−50%	Verifavia	C
2022	not published	315	626	−50%	127 of 394	88.5	253	−65%	Verifavia	C
2021	not published	409	815	−50%	136 of 377	90.3	226	−60%	Verifavia	C
2020	not published	351	751	−53%	124 of 387	91.6	217	−58%	Verifavia	C
2019	not published	262	569	−54%	122 of 394	76.1	223	−66%	Verifavia	C
2018	not published	262	729	−64%	111 of 361	74.8	184	−59%	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.