Navalyze · Ro-pax · Ship

DIAGORAS

IMO: 8916126
Type: Ro-pax ship
Flag (estimated): Greece
Port of registry: Piraeus
Technical efficiency: EEXI 42.33 g CO₂/t·nm

ISM company (DoC holder) in 2025: BLUE STAR FERRIES SINGLE MEMBER MARITIME S.A. · part of Attica Group

Report year

2019 at a glance

From the 2019 THETIS-MRV report.

Fuel kg/nm

108

Ro-pax median 155 kg/nm (−31%)

CO₂ per transport work (pax)

282

g CO₂/pax·nm · Ro-pax median 569 (−50%)

CO₂ per transport work (freight)

360

g CO₂/t·nm · Ro-pax median 223 (+62%)

Average speed

17.5 kn

Ro-pax median 15.8 kn (+11%)

Fuel per day at sea

45.4 t/day

Fuel consumed

7,647 t

CO₂ emitted

24,191 t

Distance sailed

70,856 nm

CO₂ ÷ CO₂ per mile

Time at sea

4,046 h

169 days, 46% 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 95.0 kg/nm · median 150 (−37%)

69.3Ranks 87 of 408, lowest first232

Average speedThis ship 17.6 kn · median 15.8 (+11%)

12.0Faster than 68% of ro-pax ships22.3

CO₂ per transport work (pax)This ship 63.4 g CO₂/pax·nm · median 567 (−89%)

66.8Ranks 35 of 408, lowest first1,569

CO₂ per transport work (freight)This ship 458 g CO₂/t·nm · median 253 (+81%)

48.6Ranks 268 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 ports89%
From the EU0%
Into the EU0%
At berth in the EU11%

Fuel burned laden

–

Not reported

CO₂ at berth

2,552 t

10.5% 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

DIAGORAS
Ro-pax median

80.0100.0120.0140.0160.0

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

Average speed, kn

DIAGORAS
Ro-pax median

15.516.016.517.017.518.0

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

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

DIAGORAS
Ro-pax median

0.0200400600800

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

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

DIAGORAS
Ro-pax median

0.02505007501,000

’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	+0.1 kn	−5%	−5%	−13%	−76%	Same speed, fuel per mile down 5%; better than speed alone explains (hull, engine or trade).
2023→2024	+0.1 kn	−1%	−1%	−21%	−9%	Same speed, fuel per mile flat.
2022→2023	+0.0 kn	−3%	−2%	+48%	−11%	Same speed, fuel per mile down 3%; in line with the speed change.
2021→2022	+0.0 kn	−2%	−3%	+40%	−1%	Same speed, fuel per mile down 2%; in line with the speed change.
2020→2021	−0.1 kn	−3%	−3%	+17%	+75%	Same speed, fuel per mile down 3%; in line with the speed change.
2019→2020	+0.0 kn	+2%	+2%	−40%	−33%	Same speed, fuel per mile flat.
2018→2019	+0.0 kn	−2%	−2%	+46%	−71%	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	BLUE STAR FERRIES SINGLE MEMBER MARITIME S.A.	6,644	21,095	69,949	3,968	17.6	95.0	–	–
2024	BLUE STAR FERRIES SINGLE MEMBER MARITIME S.A.	8,077	25,312	80,461	4,603	17.5	100	–	–
2023	not published	10,380	32,518	102,081	5,851	17.4	102	–	–
2022	not published	7,223	22,644	69,122	3,977	17.4	105	–	–
2021	not published	5,282	16,560	49,386	2,832	17.4	107	–	–
2020	not published	4,662	14,624	42,377	2,415	17.5	110	–	–
2019	not published	7,647	24,191	70,856	4,046	17.5	108	–	–
2018	not published	5,346	16,907	48,693	2,783	17.5	110	–	–

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	BLUE STAR FERRIES SINGLE MEMBER MARITIME S.A.	63.4	567	−89%	35 of 408	458	253	+81%	Verifavia	B
2024	BLUE STAR FERRIES SINGLE MEMBER MARITIME S.A.	268	547	−51%	136 of 404	272	233	+17%	Verifavia	B
2023	not published	294	680	−57%	109 of 386	284	234	+21%	Verifavia	–
2022	not published	330	626	−47%	131 of 394	332	253	+31%	Verifavia	B
2021	not published	333	815	−59%	123 of 377	339	226	+50%	Verifavia	B
2020	not published	191	751	−75%	98 of 387	400	217	+84%	Verifavia	B
2019	not published	282	569	−50%	125 of 394	360	223	+62%	Verifavia	B
2018	not published	982	729	+35%	223 of 361	641	184	+248%	Verifavia	B

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.