Navalyze · Ro-pax · Ship

ARIADNE

IMO: 9135262
Type: Ro-pax ship
Flag (estimated): Greece
Port of registry: Piraeus
Technical efficiency: EEXI 27.49 g CO₂/t·nm

ISM company (DoC holder) in 2025: HELLENIC SEAWAYS SINGLE MEMBER MARITIME SA · part of Attica Group

Report year

2019 at a glance

From the 2019 THETIS-MRV report.

Fuel kg/nm

185

Ro-pax median 155 kg/nm (+19%)

CO₂ per transport work (pax)

224

g CO₂/pax·nm · Ro-pax median 569 (−61%)

CO₂ per transport work (freight)

355

g CO₂/t·nm · Ro-pax median 223 (+59%)

Average speed

19.5 kn

Ro-pax median 15.8 kn (+23%)

Fuel per day at sea

86.5 t/day

Fuel consumed

15,684 t

CO₂ emitted

49,505 t

Distance sailed

85,029 nm

CO₂ ÷ CO₂ per mile

Time at sea

4,352 h

181 days, 50% 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 196 kg/nm · median 150 (+31%)

69.3Ranks 325 of 408, lowest first232

Average speedThis ship 19.1 kn · median 15.8 (+21%)

12.0Faster than 78% of ro-pax ships22.3

CO₂ per transport work (pax)This ship 45.1 g CO₂/pax·nm · median 567 (−92%)

66.8Ranks 19 of 408, lowest first1,569

CO₂ per transport work (freight)This ship 350 g CO₂/t·nm · median 253 (+38%)

48.6Ranks 231 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 ports90%
From the EU0%
Into the EU0%
At berth in the EU10%

Fuel burned laden

–

Not reported

CO₂ at berth

4,911 t

9.9% 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

ARIADNE
Ro-pax median

140.0160.0180.0200.0220.0240.0

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

Average speed, kn

ARIADNE
Ro-pax median

14.016.018.020.022.0

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

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

ARIADNE
Ro-pax median

100200300400

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

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

ARIADNE
Ro-pax median

0.02004006008001,000

’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	−0.8 kn	−4%	−8%	−16%	−84%	0.8 kn slower, fuel per mile down 4%; in line with the speed change.
2023→2024	−0.4 kn	+1%	−1%	+19%	+81%	0.4 kn slower, fuel per mile flat; worse than speed alone explains (fouling, weather, loading or trade).
2022→2023	+0.5 kn	−9%	−7%	−16%	−34%	0.5 kn faster, fuel per mile down 9%; better than speed alone explains (hull, engine or trade).
2021→2022	−0.6 kn	+5%	+2%	+95%	−12%	0.6 kn slower, fuel per mile up 5%; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	+1.0 kn	+18%	+24%	−36%	+3%	1.0 kn faster, fuel per mile up 18%; worse than speed alone explains (fouling, weather, loading or trade).
2019→2020	−0.1 kn	−3%	−3%	−6%	+16%	Same speed, fuel per mile down 3%; in line with the speed change.
2018→2019	−0.3 kn	−0%	−1%	+17%	+3%	0.3 kn slower, 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	HELLENIC SEAWAYS SINGLE MEMBER MARITIME SA	16,576	52,464	84,535	4,417	19.1	196	–	–
2024	HELLENIC SEAWAYS SINGLE MEMBER MARITIME SA	20,545	64,118	100,294	5,031	19.9	205	–	–
2023	not published	17,008	53,077	84,141	4,146	20.3	202	–	–
2022	not published	22,226	69,333	99,803	5,031	19.8	223	–	–
2021	not published	10,844	33,819	51,209	2,514	20.4	212	–	–
2020	not published	14,410	44,997	80,212	4,127	19.4	180	–	–
2019	not published	15,684	49,505	85,029	4,352	19.5	185	–	–
2018	not published	13,382	42,216	72,432	3,657	19.8	185	–	–

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	HELLENIC SEAWAYS SINGLE MEMBER MARITIME SA	45.1	567	−92%	19 of 408	350	253	+38%	Verifavia	B
2024	HELLENIC SEAWAYS SINGLE MEMBER MARITIME SA	284	547	−48%	139 of 404	257	233	+10%	RINA	B
2023	not published	157	680	−77%	81 of 386	260	234	+11%	RINA	B
2022	not published	236	626	−62%	108 of 394	311	253	+23%	RINA	B
2021	not published	269	815	−67%	112 of 377	293	226	+29%	RINA	B
2020	not published	260	751	−65%	110 of 387	389	217	+79%	RINA	B
2019	not published	224	569	−61%	115 of 394	355	223	+59%	RINA	B
2018	not published	218	729	−70%	100 of 361	367	184	+100%	RINA	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.